SARASIN-RSBD
Pressure Safety Valves & Safety Devices
Technical Information
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Engineering
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PRESSURE RELIEF VALVES
Sarasin-RSBD
Quality assurance (division)
Sarasin-RSBD
Weir operates quality programmes to cover the full
scope of their activities. Comprehensive quality
systems have been developed to serve the power, oil
and gas and industrial markets which they serve.
Weir manufactures the
Sarasin-RSBD range of pressure safety valves and
safety devices for oil and gas, petrochemical and
chemical industries, pipelines, thermal and nuclear
power plants, sugar refineries and pulp mills.
The company holds approvals to or complies with:
•
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ASME Section III ‘N’, ‘NPT’, ‘NV’
ASME Section I ‘V’
ASME Section VIII ‘UV’
EN ISO 9001: 2008
EN ISO 14001: 2004
OHSAS 18001: 2007
API Q1 TO API LICENCES API 6D (6D-0182) AND
API 6A (6A-0445)
API STD 520
API STD 526
API STD 527
API STD 2000
ISO 4126
The Sarasin-RSBD range of products is manufactured
in accordance with ASME, API and ISO standards and
therefore can meet most of worldwide customers
requirements. The company holds approvals or
complies with:
EN ISO 9001:2008 - EN ISO 14001:2004
OHSAS 18001:2007
PED 97/23/EC Module B+D Category IV
ATEX 94/9/EC
ASME Section I 'V' - ASME Section VIII 'UV'
API STD 520 - API STD 526 - API STD 527
API STD 2000
ISO 4126
SELO (China)
RTN (Russia)
Specifically, Weir can design and manufacture special
valves to meet special customer requirements.
6A-0445
6D-0182
The Quality systems have been approved for the
supply of products to meet the requirements of the
Pressure Equipment Directive (PED) and compliance
modules A, D1, H, B&D have been applied in
categories I through IV respectively.
The company is committed to compliance with
legislation and has an established environment and
health and safety policy.
An ongoing commitment to customer care is met
through the process of continuous improvement
and the further development of our systems and
processes towards meeting ISO 9001:2008.
CONTENTS
PSV Range Overview
3
Codes, Standards, Directives
& Regulations
4-5
Nomenclature
6
Valve Testing Facilities
Sizing Formulas
7
All pressure containing items are hydrostatically
tested, seat leakage tested and functionally tested.
In addition, gas, packing emission, cryogenic and
advanced functional testing can be arranged.
K and KD values
7
KB determination
8
KW determination
8
Remarks
9
KV determination
9
Tables
10-11
Examples
12-16
Orifices tables (ASME-API)
17
Selection tables
18
Capacity tables
48
Glossary
55
Material testing facilities
• Non-destructive examination by radiography,
ultrasonics, magnetic particle and liquid
penetrant.
• Chemical analysis by computer controlled direct
reading emission spectrometer.
• Mechanical testing for tensile properties at
ambient and elevated temperatures, bend and
hardness testing. Charpy testing at ambient,
elevated and sub-zero temperatures.
Further technical information can be obtained from
our Web site: http://www.weirpowerindustrial.com
2
Weir First choice for power and industrial protection
TI-7-0213
PSV RANGE OVERVIEW
Sarasin-RSBD
Spring Loaded Pressure Relief Valves
Pilot Operated Pressure Relief Valves
Body in carbon steel, stainless steel, alloy and
exotic materials; with bellows, lever and other
accessories, to ensure suitability for all service
conditions.
The Sarasin-RSBD pilot-operated pressure relief valve
is an autonomous valve. It does not need any
auxiliary source of power to operate. The advanced
technology of Sarasin-RSBD valves has been
adopted by the nuclear industry, French and U.S.
Navies and by the Oil & Gas industries. It is
complementary to the range of spring-loaded
pressure relief valves and covers a wide field of
applications including severe conditions.
Starflow S5 (steam only)
ASME Section VIII Div. 1
(UV Stamp)
API Std 526
Full Nozzle - Enlarged guide
Inlet size : 1" to 12"
Rating
: 150# to 2500#
Temp
: up to 540°C
Starflow P3/P4/P5
ASME Section VIII Div. 1
(UV Stamp)
API Std 526
Full Nozzle
Inlet size : 1" to 12"
Rating
: 150# to 2500#
Temp
: -196°C up to +540°C
76 Series
Full nozzle
API spring loaded PRV dimensions
78 Series
Semi nozzle
API POPRV dimensions
Advantages of the Sarasin-RSBD
Pilot-operated pressure relief valve
63 Series
ISO 4126
Semi-nozzle
Inlet size : 3⁄4" to 10"
Rating
: 150# to 300#
Temp
: -196°C up to +330°C
Starvalve
Changeover Valves
Low pressure drop COV
Standard COV
Combined valve with linkage
system
Sizes
: 1⁄2" - 10"
Pressure : up to 100 barg
Temp
: -196˚C up to +427˚C
Mat
: CS - SS
TI-7-0213
9 Series
ASME Section VIII Div. 1
Portable PRV - Full nozzle
Screwed/Flanged/Welded
Size
: 1⁄2" to 1 1⁄2"
Rating : 150# to 2500#
Temp
: -196°C up to +400°C
• leak-free pilot
• on-off opening, fully open or closed
(limited maintenance)
• perfect tightness (no production loss)
• perfect operation, even with capacities smaller
than those rated for all types of fluids
• excellent repeatability and reliability
• adjustable blowdown (pop action)
• no pressure/flow limit
• with additional equipment (solenoid valve),
the pressure relief valve can be used as a
discharge
valve.
86 Series
Hot service - Full nozzle
API spring loaded PRV dimensions
Set pressure : up to 180 barg
Temp : up to 550°C
71 Series
Portable - Full nozzle
To meet the most varied requirements, SarasinRSBD selects the appropriate pilot detector for the
pressure relief valve required (semi or full nozzle,
with bellows, piston etc.)
Gas - Liquid
Modulating action
Gas
Pop action
High temperature steam - Gas
Pop action
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3
PRESSURE RELIEF VALVES
Codes, Standards, Directives, Regulations
AFNOR: Association Française de Normalisation
(French Association for Standardisation)
AISI: American Iron and Steel Institute
ANSI: American National Standards Institute
API: American Petroleum Institute
• API Standard 520 - Sizing, selection and
installation of pressure-relieving devices in
refineries
Part I - Sizing and selection
Part II - Installation
• API Standard 521 – Guide for pressure-relieving
and depressuring Systems
• API Standard 526 - Flanged Steel Pressure Relief
Valves
• API Standard 527 - Testing and
acceptance for set pressure and seat tightness of
pressure relief valves
• API Recommended Practice 576 - Inspection of
pressure relieving devices
• API Standard 2000 - Venting atmospheric and
low-Pressure Storage Tanks
AS: Australian Standards
ASME: American Society of Mechanical Engineers
• Boiler and Pressure Vessel Code: compilation of
rules and guidance covering numerous types of
construction
• Section I – Power Boilers
• Section II – Materials
• SA 216 - Carbon-steel castings suitable for
fusion welding for high-temperature
service
• SA 217 - Martensitic stainless steel and
alloy steel castings for pressure-containing
parts suitable for high-temperature service
• SA 351 - Austenitic steel castings for
pressure containing parts
• SA 494 - Nickel and nickel alloy castings
• Section III – Nuclear
• Section IV – Heating Boilers
• Section VII – Care of Power Boilers
• Section VIII – Rules for construction of
pressure Vessels
• Section IX – Welding and Brazing
Qualification
• Section XII – Transportation Tanks
• ASME Standards
• B16.25 - Butt welding Ends
• B16.34 – Valves – Flanged, threaded and
welding ends
• B16.36 - Orifice Flanges
• B16.5 – Pipe flanges and flanged fittings
4
Weir First choice for power and industrial protection
Sarasin-RSBD
• B31.1 – Power piping
• B31.3 – Process piping
• B31.4 – Pipeline transportation systems for
liquid hydrocarbons and other liquids
• B31.8 - Gas transmission and distribution
Systems
• PTC 25 - Pressure Relief Devices
ASTM: American Society for testings and materials
BSi: British Standard Institution
CEN: Comité Européen de Normalisation
(European Committee for Standardization)
• EN 764 – Pressure Equipment
• Part 1: Terminology - Pressure, temperature,
volume, nominal size
• Part 2: Quantities, symbols and units
• Part 3: Definition of parties involved
• Part 4: Establishment of technical delivery
conditions for metallic materials
• Part 5: Compliance and Inspection
Documentation of Materials
• Part 6: Structure and content of operating
instructions
• Part-7: Pressure systems for unfired pressure
vessel
• EN 1092 - Flanges and their joints - Circular
flanges for pipes, valves, fittings and accessories,
PN designated
• Part 1: Steel flanges
• Part 3: Copper alloy flanges
• Part 4: Aluminium alloy flanges
• EN 1759 - Flanges and their joint - Circular
flanges for pipes, valves, fittings and accessories,
Class designated
• Part 1: Steel flanges, NPS 1/2 to 24
• Part 3: Copper alloy flanges
• Part 4: Aluminium alloy flanges
• EN 10204 - Metallic products - Types of
inspection documents
• EN 12516 - Industrial valves - Shell design
strength
• EN 13445 - Unfired Pressure Vessel
• Part 1: General
• Part 2: Materials
• Part 3: Design
• Part 4: Fabrication
• Part 5: Inspection and testing
• EN 13648 - Cryogenic vessels - Safety devices for
protection against excessive pressure
• Part 1: Safety valves for cryogenic service
• Part 2: Bursting disc safety devices for
cryogenic service
• Part 3: Determination of required discharge Capacity and sizing
TI-7-0213
PRESSURE RELIEF VALVES
Sarasin-RSBD
DIN: Deutsches Institutes für Normung (German
Institute for Standardization)
MSS: Manufacturers Standardization Society (of the
valves and fittings industry)
EUROPEAN DIRECTIVE
• SP-25: Standard marking systems for valves,
Fittings, Flanges and Unions (not applicable to
pressure safety valves – please refer to ASME
B&PVC, Section VIII, UG129)
• PED 97/23/EC: Pressure Equipment Directive
• SPVD 87/404/EC: Simple Pressure Vessels
Directive
• TPED 99/36/EC: Transportable Pressure
Equipment Directive
• ATEX 94/9/EC: Directive which provides the
technical requirements to be applied to
equipment intended for use in potentially
explosive atmospheres. The Directive is named
after the French “ATmosphère EXplosible”
• 80/181/EEC: Units of measurements
ISO: International Organization for Standardization
• SP-55 - Quality Standard for Steel Castings for
Valves, Flanges, Fittings, and Other Piping
Components - Visual Method for Evaluation of
Surface Irregularities
• SP-61 - Pressure Testing of Steel Valves (not
applicable to pressure safety valves – please refer
to API STD 527)
NACE International: National Association of
Corrosion Engineers
• ISO 4126: Safety devices for protection against
excessive pressure
• Part 1 - Safety valves
• Part 2 - Bursting disc safety devices
• Part 3 - Safety valves and bursting disc safety
devices in combination
• Part 4 - Pilot-operated safety valves
• Part 5 - Controlled safety pressure relief
systems (CSPRS)
• Part 6 - Application, selection and installation
of bursting disc safety devices
• Part 7 - Common data
• MR0175 / ISO 15156 (please read above ISO
15156)
• ISO 15156 / NACE MR0175 - Petroleum and
natural gas industries—Materials for use in H2Scontaining environments in oil and gas
production: This new standard is the result of a
six-year effort by NACE, EFC and ISO/TC 67/WG 7.
The standard is based, in the main, upon NACE
MR0175 and the European Federation of
Corrosion Reports 16 and 17. The new standard
provides methods for the qualification and
selection of metals resistant to cracking in sour
oil and gas production.
• Gost R conformity certificate – from
RostechRegulirovanie
• ISO 23251 (CEN/TC 12) - Petroleum,
petrochemical and natural gas industries Pressure-relieving and depressuring systems
• MR0103 - Materials Resistant to Sulphide Stress
Cracking in Corrosive Petroleum Refining
Environments
NB: National Board (of Boiler and Pressure Vessel
Inspectors)
GOST:
• RTN – Use licence from RosTechNadzor
organism
• Gost R explosionproof cert
• Gost R metrology certificate
FORMER
A.D. Merkblatt A2 – German PSV Requirements
Standards for Unfired Pressure Vessel
BS 6759 – English PSV Requirements Standards
DIN 2501 – Flanges, Connecting and Dimensions
JIS: Japanese Industral Standards
FD E 29-421: General requirements of installation
for PSV and RD
• JIS B 8210 – Steam boilers and pressure vessels –
Spring loaded safety valve
NF E 29-203 – Steel Flanges and collars –
Terminology – Specifications
• JIS B 8225 – Safety valves – measuring methods
for coefficient of discharge
NF E 29-005 – Pressure and temperatures ratios of
steel components
KSA: Korean Standard Association
NF E 29-410 / 411 / 412 / 413 / 414: French PSV
requirements standards
• KS B 6216 – Spring loaded safety valves for
steam boilers and pressure vessels
TI-7-0213
• SP-44 - Steel Pipeline Flanges
TRD 421 / 721: German SV Requirements Standards
for Steam Boilers
Weir First choice for power and industrial protection
5
PRESSURE RELIEF VALVES
Sarasin-RSBD
Nomenclature
Symbol
6
Designation
Unit
USCS
SI
in2
cm2
A
Calculated orifice area required to prevent the pressurised equipment from
exceeding its MAWP.
C
Gas constant (table 2), using ratio of specific heats ‘k’
G
Specific gravity of a liquid (or a gas) at a flowing temperature referred to water
(or air) at standard conditions.
k
Specific heat ratio k = CP/CV. If unknown use k = 1.001
K
Flow coefficient K = KD x 0.9
KD
Effective coefficient of discharge relating the actual versus the theoretical PSV
flow rate.
Exception: for API STD 520 sizing on steam, gas or vapor, KD has a fixed value (0.975).
KB
Capacity correction factor due to back pressure
KC
Dimensionless capacity factor when a rupture disc is combined with a PSV.
When a rupture disc does not have a published KC, then a KC value of 0.9 shall be
used provided than the flow area is equal to or greater than the inlet of the PSV.
KN
Napier factor – correction factor for the Napier steam flow equation
Value 1 if P1 ≤ 1515 psia (104.45 bara)
Equation (0.1906xP1 – 1000) / (0.2292xP1 – 1061) when
1515 psia < P1 ≤ 3215 psia (221.67 bara)
KP
Correction factor due to overpressure for uncertified valve on liquid. For 10%
overpressure, KP = 0.6
KSC
Supercritical steam correction factor
KSH
Superheat steam correction factor (table3)
KU
Correction factor used to adjust for the type of units used in the sizing equation
KV
Viscosity correction factor as determined from Figure 4 or from the following
equation: [0.9935 + (2.878/R0.5) + (342.75/R1.5)]-1
KW
Correction factor due to back pressure (table 3). If the BP is atmospheric,
use a value for KW of 1.0.
M
Molecular weight of the gas or vapour at inlet relieving conditions.
MAWP
Maximum Allowable Working Pressure
P
Set pressure
psig
barg
P1
Gas: Relieving pressure, absolute P1 = P + overpressure + atmospheric pressure
Liquid: Relieving pressure, relative P1 = P + overpressure
psia
psig
bara
barg
P2
Gas: Back pressure
Liquid: Back pressure
psia
psig
bara
barg
Q
Required flow rate through the device (for liquid)
US gpm
m3/hr
T
Relieving temperature of the inlet gas or vapour
°R=°F+460
K=°C+273
V
Required flow rate through the device scfm at 14.7 psia and 60°F
Nm3/hr at 1.013 bara and 15.5°C
scfm
Nm3/hr
W
Required flow rate through the device (for gas)
lb/hr
kg/hr
Z
Compressibility factor – if unknown, use Z = 1
Weir First choice for power and industrial protection
TI-7-0213
PRESSURE RELIEF VALVES
Sarasin-RSBD
Sizing formulas
USCS Units
ASME Section VIII div.1
SI Units
API STD 520
ASME Section VIII div.1
ISO 4126
Vapors or Gases
A=
W ( T Z )0.5
(Mass Flow Rate Sizing)
C K P1 KB
API STD 520
ISO 4126
A=
W ( TZ )0.5
M0.5
C KD P1 KB
A=
M0.5
KU W ( T Z )0.5
C K P1 KB
A=
M0.5
C KD P1 KB M0.5
KU = 1.3164
Vapors or Gases
A=
V ( T Z M )0.5
(Volumetric Flow Rate
A=
V ( T Z M )0.5
C K P1 KB KU
Sizing)
KU = 6.32
A=
A=
A=
KU = 51.5
A=
Certified Volumetric Flow
A=
KU = 3.159
A=
KU KV KW (P1–P2)0.5
W
KU K P1 KB KSH KN
A=
KU = 52.5
Q G0.5
V ( T Z G )0.5
C KD P1 KB KU
W
KU = 51.5
Q G0.5
K
KU = 17.024
A=
KU = 3.159
KU KD P1 KB KSH KN
V ( T Z M )0.5
C KD P1 KB KU
V ( T Z G )0.5
W
KU K P1 KB KSH KN
A=
C K P1 KB KU
KU = 1.175
W
Liquids
A=
KU C KD P1 KB
KU = 1.175
Steam (1)
V ( T Z M )0.5
KU = 17.024
V ( TZG )0.5
KU C K P1 KB
KU = 1.3164
C K P1 KB KU
KU = 6.32
V ( T Z G )0.5
A=
A=
C KD P1 KB KU
KU W ( T Z )0.5
KU = 52.5
A=
KD KU KV KW (P1–P2)0.5
KU KD P1 KB KSH KN
Q G0.5
A=
K KU KV KW (P1–P2)0.5
Q G0.5
KD KU KV KW (P1–P2)0.5
Rate Sizing
KU = 38
KU = 38
Liquids
KU = 5.092
A=
KU = 5.092
Q G0.5
Non certified Volumetric
A=
KD KP KU KV KW (P1–P2)0.5
Q G0.5
KD KP KU KV KW (P1–P2)0.5
Flow Rate Sizing
KU = 38
KP = 1 for P1=1.25P
KU = 5.092
KP = 1 for P1=1.25P
KP = 0.6 for P1=1.1P
Air
A=
V T0.5
A=
V T0.5
KU K P1 KB
KU KD P1 KB
KU = 418
KU = 418
KP = 0.6 for P1=1.1P
A=
V T0.5
A=
V T0.5
KU K P1 KB
KU KD P1 KB
KU = 1125
KU = 1125
(1) : not applicable to ISO 4126
K and KD Factors
K
PSV series
P (Starflow)
9
76
78
86
V (Starsteam)
KD
Gas, Vapor, Steam
Liquid
Gas, Vapor, Steam
Liquid
0.876
0.823
0.848
0.878
0.848
0.878
0.631
0.632
0.975
0.975
0.975
0.975
0.975
0.701
0.702
0.65
0.952
0.857
Set pressures and overpressure limits for pressure safety valves
The below table is compliant with ASME B&PV Code Section VIII Division 1 and API STD 520.
Single Valve
Multiple Valves
Maximum
Maximum
Maximum
Maximum
Set Pressure
Overpressure
Set Pressure
Overpressure
(%)
(%)
(%)
(%)
100
110
Blocked discharge
1st valve
Additional valve
100
116
105
116
Fire case
1st valve
TI-7-0213
100
121
Additional valve
100
121
105
121
Supplem. valve
110
121
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PRESSURE RELIEF VALVES
Sarasin-RSBD
Fig. 1 - KB: Back pressure correction factor (constant back pressure,
conventional valve without bellows) gas + steam
1.1
1
k=1.1
Constant back pressure
k=1.3
When a pressure relief valve is discharging against a
constant superimposed back pressure, its flow rate
may be affected by the back pressure only if the
flow is sub-critical, i.e. when the ratio of the back
pressure (absolute) to the relieving pressure
(absolute) is above the critical point which is very
close to 0.55.
k=1.5
0.9
Back pressure correction factor,
compressible fluids
k=1.7
0.8
0.7
Therefore KB, back pressure correction factor, may
be found as follows :
a) Calculate absolute back pressure ratio :
0.6
0.5
40
50
60
Absolute back pressure ratio =
70
80
90
100
=
Set pressure + overpressure
+ atmospheric pressure
Absolute back pressure
Absolute relieving pressure
Fig. 2 - KB: Back pressure correction factor (balanced bellows
valve only) gas + steam at 10% overpressure
According
to API RP 520
1.2
Absolute back pressure
1
Pressure > 7 bar
0.8
Pressure < 7 bar
b) If ratio is less than or equal to 0.55, use KB = 1
c) If ratio is over 0.55, enter Fig. 1 to find in
relation with the appropriate k = Cp/Cv value
Variable back pressure
Where the back pressure is variable but does not
exceed 10% of the set pressure, a conventional
pressure relief valve may be used, provided the
corresponding set pressure variation is acceptable.
If the variable back pressure exceeds 10% of the set
pressure, a balanced bellows valve should be used.
The pressure relief valve flow rate may be affected
by the back pressure. Therefore, KB, back pressure
correction factor, may be found as follows :
a) Calculate gauge back pressure ratio :
0.6
0.4
0.2
0
0
20
Absolute back pressure ratio =
40
60
80
100
Gauge back pressure
Gauge relieving pressure
Fig. 3 - Kw: Back pressure correction factor (variable back pressure,
balanced bellows valve on liquid service only)
1.05
1
0.95
0.9
Maximum back pressure
Set pressure
b) Enter Fig. 2 to find KB in relation with the
appropriate overpressure value.
Back pressure correction factor,
incompressible fluids
Balanced bellows relief valves discharging
incompressible fluids against a variable back
pressure have their capacity affected by back
pressure. Back pressure correction factor for bellows
valves on incompressible fluid service may be found
as follows:
a) Calculate gauge back pressure ratio :
0.85
Maximum back pressure
0.8
Set pressure
0.75
b) Enter Fig. 3 to find KW
0.7
0.65
0.6
0
0.1
Gauge back pressure ratio =
8
0.2
0.3
0.4
0.5
Gauge back pressure
Set pressure
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PRESSURE RELIEF VALVES
Sarasin-RSBD
Fig. 4 - KV: Viscosity correction factor
Viscosity Correction Factor
When sizing a relief valve for a viscous liquid
service, it is required to first size as if the liquid is
non viscous. KV value is then considered as 1.0. The
result is named preliminary required discharge
area, AR1.
From API STD 526, the next larger orifice, AS, has
then to be selected. It is used to determine the
Reynold’s number, R, from one of the following
equation:
R=
CP √AS
12,700 Q
U √AS
µ √AS
R=
0.9
0.8
0.7
0.5
0.4
SI Units
R = 31,321 Q G
1
0.6
USCS Units
R = 2,800 Q G
1.1
142,028 Q
U √AS
* Note = not recommended when viscosity less than
0.3
10
100
1000
11 000
100 000
R : REYNOLDS number
100 SSU.
Where
Remarks on sizing formulas
AR1 : preliminary required discharge area (USCS in2
- SI cm2)
AS : selected discharge area (USCS in2 - SI cm2)
U : viscosity at the flowing temperature, in
Seybolt Universal Seconds (SSU)
µ
: absolute viscosity at the flowing temperature,
in centipoise
Critical flow on compressible fluids and
steam
When R is determined, it is required to obtain the
KV value from Figure 4. or from the following
equation :
KV = [ 0.9935 + (2.878 / R0.5 ) + ( 342.75 / R1.5 ) ] -1
Then AR1 must be corrected using the KV value, in
order to determine AR2. If the corrected area, AR2,
exceed the selected orifice AS, then the above
method must be repeated using the next larger
orifice available in API STD 526.
The sizing formula for compressible fluid is based
on critical flow conditions, i.e. when sonic velocity
is reached at the valve throat. These conditions are
reached when the upstream pressure, absolute,
exceeds twice the downstream pressure, absolute.
When these conditions are not attained (i.e. when
the set pressure is less than 1 bar, or when the back
pressure is high), a back pressure correction factor
KB should be considered. This coefficient reduces
the flow rate of the valve for a given relieving
pressure.
Flow with back pressure = flow without back
pressure x KB
Superheated steam
The steam sizing formula is based on saturated
steam conditions. When the steam is in
superheated conditions, a capacity correction factor
for steam expansion KSH, should be considered.
This coefficient reduces the flow rate of the valve
for a given relieving pressure.
Wet steam
Although some standards such as ISO 4126 allow
an increase of the mass-flow rate for a given valve
at given relieving conditions for wet steam relief,
provided the steam quality is in excess of 90%,
there is no such allowance in the ASME Code or API
standard. Care should therefore be taken to use this
allowance only when permitted by the applicable
Codes and Standards.
TI-7-0213
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9
PRESSURE RELIEF VALVES
Sarasin-RSBD
Table 1 : Molecular weights, ratio of specific heat (Cp/Cv), gas constant “C”
Gas
Molecular weights
Cp/Cv
C
C/356
Acetylene
Hydrochloric acid
Air
Ammonia
Argon
Nitrogen
Benzene
Chloride
Cyclohexane
Carbon disulphide
Carbon dioxide
Sulphur dioxide
Ethane
Ethylene
Natural gas
Helium
Hexane
Hydrogen
Hydrogen sulphide
Iso-Butane
Methane
Methyl alcohol
Methyl chloride
Carbon monoxide
N-Butane
Oxygen
Pentane
Propane
Water vapour/Steam
26
36.5
29
17
40
28
78
71
84
76
44
64
30
28
19
4
86
2
34
58
16
32
50.5
28
58
32
72
44
18
1.28
1.40
1.40
1.33
1.66
1.40
1.10
1.36
1.08
1.21
1.28
1.26
1.22
1.20
1.27
1.66
1.08
1.40
1.32
1.11
1.30
1.20
1.20
1.40
1.11
1.40
1.09
1.14
1.30
345
356
356
351
377
356
327
352
324
338
345
342
339
337
345
377
324
356
348
328
346
337
337
356
328
356
325
331
347
0.969
1.000
1.000
0.986
1.059
1.000
0.919
0.989
0.910
0.949
0.969
0.961
0.952
0.947
0.969
1.059
0.910
1.000
0.978
0.921
0.972
0.947
0.947
1.000
0.921
1.000
0.913
0.930
0.975
Table 2 : Gas constants ''C'' and first flow number ''Nc'' versus k=Cp/Cv
10
k
C
Nc
k
C
Nc
1.00
1.02
1.04
1.06
1.08
1.10
1.12
1.14
1.16
1.18
1.20
1.22
1.24
1.26
1.28
1.30
1.32
1.34
1.36
1.38
1.40
1.42
1.44
1.46
1.48
1.50
315
318
320
322
324
327
329
331
333
335
337
339
341
343
345
347
349
351
352
354
356
358
359
361
363
364
0.607
0.611
0.615
0.620
0.624
0.628
0.632
0.637
0.641
0.645
0.648
0.652
0.656
0.660
0.637
0.667
0.671
0.674
0.678
0.681
0.685
0.688
0.691
0.695
0.698
0.701
1.52
1.54
1.56
1.58
1.60
1.62
1.64
1.66
1.68
1.70
1.72
1.74
1.76
1.78
1.80
1.82
1.84
1.86
1.88
1.90
1.92
1.94
1.96
1.98
2.00
2.02
2.20
366
368
369
371
372
374
376
377
379
380
382
383
384
386
387
388
390
391
392
394
395
397
398
399
400
401
412
0.704
0.707
0.710
0.713
0.716
0.719
0.722
0.725
0.728
0.731
0.734
0.736
0.739
0.742
0.744
0.747
0.750
0.752
0.755
0.758
0.760
0.762
0.765
0.767
0.770
0.772
0.793
Weir First choice for power and industrial protection
TI-7-0213
PRESSURE RELIEF VALVES
Sarasin-RSBD
Table 3 : KSH Superheat correction factor
Steam temperature in ˚C
Bara
5.0
7.5
10.0
12.5
15.0
17.5
20.0
22.5
25.0
27.5
30.0
32.5
35.0
37.5
40.0
42.5
45.0
47.5
50.0
52.5
55.0
57.5
60.0
62.5
65.0
67.5
70.0
72.5
75.0
77.5
80.0
82.5
85.0
87.5
90.0
92.5
95.0
97.5
100.0
102.5
105.0
107.5
110.0
112.5
115.0
117.5
120.0
122.5
125.0
127.5
130.0
132.5
135.0
137.5
140.0
142.5
145.0
147.5
150.0
152.5
155.0
157.5
160.0
162.5
165.0
167.5
170.0
172.5
175.0
177.5
180.0
182.5
185.0
187.5
190.0
192.5
195.0
197.5
200.0
202.5
205.0
207.5
210.0
212.5
215.0
217.5
220.0
TI-7-0213
205.0 225.0 250.0 275.0 300.0 325.0 350.0 375.0 400.0 425.0 450.0 475.0 500.0 525.0 550.0 575.0 600.0 625.0
0.991
0.995
0.985
0.981
-
0.968
0.972
0.973
0.976
-
0.942
0.946
0.950
0.954
0.957
0.959
0.960
0.963
-
0.919
0.922
0.925
0.928
0.932
0.935
0.939
0.943
0.946
0.948
0.949
0.951
0.953
0.956
0.959
0.961
-
0.896
0.899
0.902
0.905
0.907
0.910
0.913
0.916
0.919
0.922
0.925
0.929
0.933
0.936
0.940
0.943
0.944
0.946
0.947
0.949
0.952
0.954
0.957
0.960
0.964
0.966
-
0.876
0.878
0.880
0.883
0.885
0.887
0.889
0.892
0.894
0.897
0.899
0.902
0.905
0.908
0.910
0.913
0.917
0.919
0.922
0.926
0.930
0.933
0.937
0.940
0.944
0.946
0.947
0.949
0.951
0.953
0.955
0.957
0.960
0.963
0.966
0.970
0.973
0.977
0.981
0.984
-
0.857
0.859
0.861
0.863
0.865
0.866
0.868
0.870
0.872
0.874
0.876
0.879
0.881
0.883
0.885
0.887
0.890
0.892
0.894
0.897
0.899
0.902
0.904
0.907
0.910
0.913
0.916
0.919
0.922
0.925
0.928
0.932
0.935
0.939
0.943
0.947
0.950
0.954
0.957
0.959
0.961
0.962
0.963
0.964
0.964
0.965
0.966
0.967
0.967
0.968
0.969
0.971
0.972
0.974
0.976
0.978
-
0.839
0.841
0.843
0.844
0.846
0.847
0.849
0.850
0.852
0.854
0.855
0.857
0.859
0.861
0.863
0.864
0.866
0.868
0.870
0.872
0.874
0.876
0.878
0.880
0.882
0.885
0.887
0.889
0.891
0.893
0.896
0.898
0.901
0.903
0.906
0.909
0.911
0.914
0.917
0.920
0.923
0.925
0.928
0.930
0.931
0.932
0.933
0.935
0.936
0.937
0.939
0.940
0.942
0.944
0.946
0.947
0.948
0.948
0.948
0.947
0.947
0.946
0.945
0.945
0.945
0.944
0.944
0.944
0.944
0.944
0.944
0.945
0.945
0.945
0.946
0.948
0.950
0.952
0.960
0.960
-
0.823
0.824
0.825
0.827
0.828
0.829
0.831
0.832
0.834
0.835
0.837
0.838
0.840
0.841
0.842
0.844
0.845
0.847
0.848
0.850
0.851
0.853
0.855
0.856
0.859
0.860
0.862
0.863
0.865
0.867
0.869
0.871
0.873
0.875
0.877
0.879
0.881
0.883
0.885
0.887
0.889
0.891
0.893
0.893
0.894
0.894
0.894
0.895
0.896
0.896
0.896
0.897
0.897
0.897
0.897
0.898
0.898
0.898
0.899
0.899
0.899
0.899
0.900
0.900
0.900
0.900
0.900
0.900
0.900
0.900
0.901
0.901
0.901
0.901
0.901
0.901
0.900
0.899
0.899
0.899
0.899
0.898
0.896
0.894
0.892
0.891
0.887
0.807
0.808
0.809
0.810
0.812
0.813
0.814
0.815
0.816
0.817
0.819
0.820
0.822
0.823
0.824
0.825
0.826
0.828
0.829
0.830
0.831
0.833
0.834
0.836
0.837
0.839
0.840
0.842
0.843
0.844
0.846
0.847
0.849
0.850
0.852
0.853
0.855
0.857
0.859
0.860
0.862
0.863
0.865
0.865
0.865
0.865
0.864
0.864
0.864
0.864
0.864
0.864
0.863
0.863
0.863
0.862
0.862
0.862
0.861
0.861
0.861
0.860
0.859
0.859
0.858
0.857
0.856
0.855
0.854
0.853
0.852
0.851
0.850
0.849
0.847
0.846
0.844
0.842
0.840
0.839
0.837
0.834
0.832
0.829
0.826
0.823
0.820
0.792
0.793
0.794
0.795
0.796
0.797
0.798
0.799
0.800
0.801
0.802
0.803
0.804
0.806
0.807
0.808
0.809
0.810
0.811
0.812
0.813
0.815
0.816
0.817
0.818
0.819
0.820
0.822
0.823
0.824
0.825
0.827
0.828
0.829
0.830
0.832
0.833
0.834
0.836
0.837
0.838
0.839
0.840
0.840
0.840
0.839
0.839
0.839
0.838
0.838
0.837
0.837
0.837
0.836
0.835
0.834
0.833
0.832
0.832
0.831
0.830
0.829
0.828
0.827
0.826
0.825
0.823
0.822
0.820
0.819
0.817
0.815
0.814
0.812
0.810
0.808
0.806
0.803
0.801
0.798
0.795
0.792
0.790
0.786
0.783
0.779
0.776
0.778
0.779
0.780
0.781
0.782
0.782
0.784
0.785
0.785
0.786
0.787
0.788
0.789
0.790
0.791
0.792
0.793
0.793
0.794
0.795
0.797
0.798
0.798
0.799
0.801
0.802
0.802
0.803
0.805
0.806
0.806
0.807
0.809
0.810
0.811
0.812
0.813
0.814
0.815
0.816
0.817
0.818
0.819
0.819
0.818
0.817
0.817
0.816
0.816
0.815
0.814
0.813
0.813
0.812
0.811
0.810
0.809
0.808
0.807
0.806
0.804
0.803
0.802
0.801
0.799
0.797
0.796
0.794
0.792
0.791
0.789
0.787
0.785
0.783
0.781
0.778
0.776
0.773
0.770
0.767
0.764
0.761
0.758
0.754
0.750
0.746
0.743
0.765
0.766
0.766
0.767
0.768
0.769
0.769
0.770
0.771
0.772
0.772
0.773
0.774
0.775
0.776
0.776
0.777
0.778
0.779
0.780
0.780
0.782
0.783
0.783
0.784
0.785
0.786
0.788
0.788
0.788
0.789
0.790
0.791
0.792
0.793
0.794
0.795
0.796
0.797
0.798
0.799
0.799
0.800
0.799
0.798
0.797
0.797
0.796
0.796
0.795
0.794
0.792
0.792
0.791
0.790
0.789
0.787
0.786
0.785
0.784
0.782
0.781
0.779
0.778
0.776
0.774
0.773
0.771
0.769
0.767
0.765
0.763
0.761
0.758
0.756
0.753
0.750
0.748
0.745
0.742
0.738
0.735
0.732
0.728
0.724
0.720
0.716
0.752
0.753
0.753
0.754
0.755
0.756
0.756
0.757
0.757
0.758
0.759
0.759
0.760
0.761
0.762
0.762
0.763
0.764
0.765
0.765
0.766
0.767
0.768
0.768
0.769
0.769
0.770
0.771
0.772
0.772
0.773
0.774
0.775
0.776
0.776
0.777
0.778
0.779
0.780
0.780
0.781
0.782
0.782
0.781
0.780
0.780
0.779
0.778
0.777
0.776
0.775
0.774
0.773
0.772
0.771
0.770
0.768
0.767
0.766
0.764
0.763
0.761
0.759
0.757
0.756
0.754
0.752
0.750
0.748
0.746
0.744
0.742
0.739
0.737
0.734
0.732
0.729
0.726
0.723
0.720
0.717
0.713
0.710
0.706
0.702
0.698
0.694
0.740
0.740
0.741
0.741
0.742
0.743
0.744
0.744
0.744
0.745
0.746
0.746
0.747
0.748
0.748
0.749
0.749
0.750
0.751
0.752
0.752
0.753
0.753
0.754
0.754
0.755
0.756
0.756
0.757
0.758
0.758
0.759
0.760
0.760
0.761
0.762
0.763
0.763
0.764
0.764
0.765
0.766
0.766
0.765
0.764
0.763
0.762
0.761
0.760
0.759
0.758
0.757
0.756
0.755
0.753
0.752
0.751
0.749
0.748
0.746
0.745
0.743
0.741
0.739
0.738
0.736
0.734
0.732
0.730
0.728
0.725
0.723
0.720
0.718
0.715
0.713
0.710
0.707
0.704
0.701
0.697
0.694
0.691
0.686
0.682
0.679
0.674
0.728
0.729
0.729
0.729
0.730
0.731
0.731
0.732
0.732
0.733
0.733
0.734
0.734
0.735
0.735
0.736
0.737
0.737
0.738
0.738
0.739
0.739
0.740
0.740
0.741
0.742
0.742
0.743
0.744
0.744
0.744
0.745
0.746
0.746
0.747
0.747
0.748
0.749
0.749
0.750
0.750
0.751
0.751
0.750
0.749
0.748
0.747
0.746
0.745
0.744
0.743
0.741
0.740
0.739
0.737
0.736
0.734
0.733
0.732
0.730
0.728
0.727
0.725
0.723
0.721
0.719
0.717
0.715
0.713
0.711
0.709
0.706
0.704
0.701
0.698
0.696
0.693
0.690
0.687
0.683
0.680
0.677
0.673
0.669
0.665
0.661
0.657
0.717
0.717
0.718
0.718
0.718
0.719
0.720
0.720
0.720
0.721
0.722
0.722
0.722
0.723
0.723
0.724
0.725
0.725
0.725
0.726
0.727
0.727
0.727
0.728
0.729
0.729
0.729
0.730
0.730
0.731
0.732
0.732
0.732
0.733
0.734
0.734
0.734
0.735
0.735
0.736
0.737
0.737
0.737
0.736
0.735
0.734
0.733
0.732
0.731
0.729
0.728
0.727
0.725
0.724
0.723
0.721
0.720
0.719
0.717
0.716
0.714
0.712
0.710
0.708
0.706
0.704
0.702
0.700
0.698
0.696
0.694
0.691
0.689
0.686
0.683
0.681
0.677
0.674
0.671
0.668
0.665
0.661
0.658
0.654
0.650
0.646
0.641
Weir First choice for power and industrial protection
0.706
0.707
0.707
0.707
0.708
0.708
0.708
0.709
0.710
0.710
0.710
0.711
0.711
0.711
0.712
0.713
0.713
0.713
0.714
0.714
0.714
0.715
0.716
0.716
0.716
0.717
0.717
0.717
0.718
0.719
0.719
0.719
0.720
0.721
0.721
0.721
0.722
0.722
0.722
0.723
0.723
0.724
0.724
0.723
0.722
0.721
0.719
0.718
0.717
0.716
0.715
0.713
0.712
0.711
0.709
0.707
0.706
0.704
0.703
0.070
0.700
0.698
0.696
0.694
0.692
0.690
0.688
0.686
0.684
0.681
0.679
0.677
0.674
0.671
0.669
0.666
0.663
0.660
0.657
0.654
0.651
0.647
0.643
0.640
0.636
0.631
0.627
11
PRESSURE RELIEF VALVES
Sarasin-RSBD
Sizing examples according to API STD 520
B - With constant back pressure
1 - COMPRESSIBLE FLUID (Gas, Vapour, Steam)
B -1 Critical flow
Same data as above, with a constant back pressure.
Pb = 13.8 bar
Pb = 13.8 bar + 1.013 bar abs.
Pb = 14.813 bar abs
Absolute back pressure ratio
Pb(abs)/P1(abs), in %
100 x Pb/P1 = 32%
A - Without back pressure
• Data :
Fluid : air at ambient temperature (15°C)
M = 29 (table 1)
Z = 1 (perfect gas)
k = 1.40 (table 1)
C = 356 (table 2)
Flowing temperature, absolute
T = 15 + 273 = 288 K
Required flow :
W = 12247 kg/h
Set pressure :
P = 41.38 barg.
Overpressure :
! = 10%
Back pressure :
Pb = atmosphere
Pb = 1.013 bar abs.
Absolute relieving pressure P1 = P + overpressure +
atmospheric pressure
P1 = 1.10 x P + 1.013 = 46.53 bar abs.
Absolute back pressure ratio :
100 x Pb/P1 = 2%
• The absolute back pressure ratio being less than
50%, the critical conditions are attained at valve
throat and there is no correction for back pressure,
KB = 1
• K = 0.975
• To find the required discharge area, solve :
A=
KUW " T Z
C K P1 KB "M
with KU=1.3164
A = 3.15 cm2
• Select the next larger orifice (see Orifice Tables):
A' = 3.24 cm2 (orifice G)
The valve flow rate, (including the 0.9 safety
factor) is :
W' = (A'/A) x W
W' = 12597 kg/h
• Valve selection
API STD 520 recommend to use a spring loaded
valve. For an API Std 526 SRV (Starflow series), go
to the G orifice selection table (see the relevant
catalogue) with the relieving temperature, 15°C,
and find the valve model number suitable for a set
pressure of 41.38 bar : P73G2.
• Since the absolute back pressure is less than 50%,
the critical conditions are attained at valve throat
and there is no correction for back pressure : KB = 1.
See diagram 1.
• Valve sizing and selection same as above ; see § A.
Note : the set pressure of the valve on the test
bench shall be the actual set pressure minus the
back pressure, i.e. 27.58 bar.
B -2 Sub-critical flow
Same data as above, with a constant back pressure
big enough to generate sub-critical conditions.
Pb = 31 bar
Pb = 31 bar + 1.013 bar abs.
Pb = 32.013 bar abs
Absolute back pressure ratio :
100 x Pb/P1 = 69%
• Since the absolute back pressure is more than
50%, the flow is sub-critical through the valve
throat. The correction factor for back pressure, KB, is
obtained from diagram 1, knowing k = 1.4.
KB = 0.925
Required discharge area :
A=
KUW " T Z
C K P1 KB "M
with KU=1.3164
A = 3.40cm2
• Next larger orifice,
A' = 5.06 cm2 (orifice H)
Valve flow is :
W' = (A'/A) x W
W' = 18.226 kg/h
As there is no back pressure : select the
conventional type and material code 330. For air
service, specify lift lever if required by applicable
code.
Valve model number P 73 G2 330.
Option : lift lever (if necessary).
Dimensions :
A = 123.8 mm - B = 152.4 mm
Inlet DN 1 1⁄2" x 300 lbs - outlet DN 3" x 150 lbs
Weight : 25 kg
12
Weir First choice for power and industrial protection
TI-7-0213
PRESSURE RELIEF VALVES
Sarasin-RSBD
• Valve selection (same as paragraph A)
Valve model number : P23 H2 330
Option : lift lever (if necessary)
Dimensions :
A = 130.2 mm - B = 123.8 mm
Inlet 2" x 300 lbs - outlet 3" x 150 lbs
Note : the set pressure of the valve on the test
bench will be the actual set pressure without any
correction for back pressure.
Note : the valve set pressure on the test bench will
be the actual set pressure minus the back pressure,
i.e. : 10.38 bar.
• Data :
Required flow of saturated steam :
W = 45360 kg/h
Set pressure :
P = 34.5 bar
Overpressure :
! = 10%
Absolute relieving pressure P1 = P + overpressure +
atmospheric pressure
P1 = 1.10 x P + 1.013 = 38.96 bar abs.
C - With variable back pressure
C-1 The variable back pressure does not
exceed 10% of the set pressure.
Same data as above with a variable back pressure
Pb(V).
Pb(V) = 0 at 4.13 bar
Gauge back pressure ratio : Pb(V)/P1 ; %
100 x Pb(V)/P1 = 10%
• Since the gauge back pressure is less than 10% it
is generally acceptable to use a conventional valve
without any provision for back pressure.
• Valve selection : same as § B-1 above.
C-2 The variable back pressure exceeds 10%
of the set pressure.
Same data as above with a variable back pressure
Pb(V), so that :
Pb(V) = 0 at14.5 bar
Gauge back pressure ratio : Pb(V)/P1 ; %
100 x Pb(V)/P1 = 35%
• Since the gauge back pressure ratio is more than
10%, it is recommended to use a balanced bellows
valve. The capacity of the valve for a given
overpressure is affected by a back pressure
correction factor, KB, for balanced bellows valves on
compressible fluids, given by diagram 2.
KB = 0.94
Required discharge area :
A=
KUW " T Z
C K P1 KB "M
with KU=1.3164
A = 3.35cm2
• Next larger orifice,
A' = 5.06 cm2 (orifice H)
Valve flow is :
W' = (A'/A) x W
W' = 18.498 kg/h
• Valve selection :
Valve model number : P23 H2 430 (430 for
balanced bellows valve)
Option : lift lever (if necessary)
Dimensions :
A = 130.2 mm - B = 123.8 mm
Inlet 2" x 300 lbs - outlet 3" x 150 lbs
TI-7-0213
2 - STEAM
A - Saturated steam
• STARFLOW discharge coefficient - K = 0.975
To find the discharge area, solve :
A=
W
KU K P1 KB KSH KN
A = 22.79 cm2
• Select the next larger orifice :
A' = 23.2 cm2 (orifice M)
The valve flow rate (including the 0.9 safety factor)
is :
W' = (A'/A) x W
W' = 46176 kg/h
• Valve selection (see above)
Valve model number : P46 M2 530
Option : none
Dimensions :
A = 177.8 mm - B = 184.1 mm
Inlet 4" x 300 lbs - outlet 6" x 150 lbs
B - Superheated steam
Same data as above, with a relieving temperature of
540°F/282°C
• Superheat correction factor, from table 3 :
KSH = 0.96
KSH = 0.96
• Required discharge area :
(USCS)
A=
W
KU K P1 KB KSH KN
with KU=51.5
A = 3.68 in.2
(SI)
A=
W
KU K P1 KB KSH KN
with KU=52.5
A = 23.76 cm2
• Next larger orifice :
A’ = 4.34 in.2/28 cm2 (orifice)
• Valve selection (same as above) :
Valve model number P46N2 530
Option : none
Dimensions : A 73/4"/196.8 mm - B = 81/4"/209.5 mm
Inlet 4"-300 lbs - Outlet 6"-150 lbs
Weight 300 lbs/136 kg
Weir First choice for power and industrial protection
13
PRESSURE RELIEF VALVES
Sarasin-RSBD
3 - INCOMPRESSIBLE FLUID (Liquids)
• Data : Type P valve (with Kd = 0.701 certified)
Specific gravity :
G=1
Required flow :
Q = 54.48 m3/h
Set pressure :
P = 10.34 bar
Overpressure :
! = 10%
Back pressure :
Pb = atmosphere
Discharge coefficient :
K = 0.701
To find the required discharge area, solve :
A=
Q "G
K KW KV KU
"1.1P - Pb
with KU=5.092
K = 0.701
KW and KV = 1
A = 4.51 cm2
• Select the next larger orifice
A' = 5.06 cm2 (orifice H)
Actual flow of the valve is :
=
A'
xW
A
= 61.12 m3/h
Back pressure :
Pb = atmospheric
Pb = 1.013 bar abs.
Absolute relieving pressure P1 = P + overpressure +
atmospheric pressure
P1 = 1.10 x P + 1.013 = 46.53 bar abs.
Absolute back pressure ratio :
100 x Pb/P1 = 2%
• The absolute back pressure ratio being less than
50%, the critical conditions are attained at valve
throat and there is no correction for back pressure,
KB = 1
• STARFLOW discharge coefficient : K = 0.975
• To find the required minimum discharge area,
solve :
A=
KUW " T Z
C K P1 KB "M
with KU=1.3164
A = 3.15 cm2
• Select the next larger orifice,
A' = 3.8 cm2 (orifice G)
The valve flow rate (including the 0.9 safety factor)
is :
W' = (A'/A) x W
W' = 12597 kg/h
• Valve selection
Example of sizing according to ASME
Section VIII DIV.1
Go to the G orifice selection table with the relieving
temperature, 15°C, and find the valve model
number suitable for a set pressure of 41.38 bar :
P 75 G2
As there is no back pressure : select the
conventional type and material code 330. For air
service, specify lift lever if required by applicable
code.
Valve model number P 73 G2 330.
Option : lift lever (if necessary).
Dimensions :
A = 123.8 mm - B = 152.4 mm
Inlet 1 1⁄2" x 300 lbs - outlet 3" x 150 lbs
1 - COMPRESSIBLE FLUID (Gas, Vapour, Steam)
B - With constant back pressure
A - Without back pressure
B-1 Critical flow
Same data as above, with a constant back pressure.
Pb = 13.8 bar
Pb = 13.8 bar + 1.013 bar abs.
Pb = 14.813 bar abs
Absolute back pressure ratio
Pb(abs)/P1(abs), in %
100 x Pb/P1 = 32%
• Valve selection
Go to the H orifice selection table, with relieving
temperature (ambient), and find the valve model
number suitable for a set pressure of 10.34 bar :
P73 H1. As there is no back pressure : select the
conventional type and material code 330.
Valve model number : P73 H 1330
Dimensions :
A = 130.2 mm - B = 123.8 mm
Inlet 11⁄2" x 150 lbs - outlet 3" x 150 lbs
• Data :
Fluid : air at ambient temperature (15°C)
M = 29 (table 1)
Z = 1 (perfect gas)
k = 1.40 (table 1)
C = 356 (table 2)
Flowing temperature, absolute
T = 15 + 273 = 288 K
Required flow :
W = 12247 kg/h
Set pressure :
P = 41.38 barg
Overpressure :
! = 10%
14
Weir First choice for power and industrial protection
• Since the absolute back pressure is less than 50%,
the critical conditions are attained at valve throat
and there is no correction for back pressure : KB=1.
TI-7-0213
PRESSURE RELIEF VALVES
Sarasin-RSBD
• Valve sizing and selection same as above;
see §A.
Note : the set pressure of the valve on the test
bench shall be the actual set pressure minus the
back pressure, i.e. 27.58 bar.
B-2 Sub-critical flow
Same data as above, with a constant back pressure
big enough to generate sub-critical conditions.
Pb = 31 bar
Pb = 31 bar + 1.013 bar abs.
Pb = 32.013 bar abs
Absolute back pressure ratio :
100 x Pb/P1 = 69%
• Since the absolute back pressure is more than
50%, the flow is sub-critical through the valve
throat. The correction factor for back pressure, KB, is
obtained from diagram 1, knowing k = 1.4.
KB = 0.925
Required discharge area :
A=
KUW " T Z
C K P1 KB "M
with KU=1.3164
A = 3.40cm2
• Next larger orifice
A' = 5.06 cm2 (orifice H)
Valve flow is :
W' = (A'/A) x W
W' = 18.226 kg/h
• Valve selection (same as above)
Valve model number : P23 H2 330
Option : lift lever (if necessary)
Dimensions :
A = 130.2 mm - B = 123.8 mm
Inlet 2" x 300 lbs - outlet 3" x 150 lbs
Note : the valve set pressure on the test bench will
be the actual set pressure minus the back pressure,
i.e. 10.38 bar.
C - With variable back pressure
C-1 The variable back pressure does not
exceed 10% of the set pressure. Same data as
above with a variable back pressure Pb(V).
Pb(V) = 0 to 4.13 bar
Gauge back pressure ratio : Pb(V)/P1 ; %
100 x Pb(V)/P1 = 10%
• Since the gauge back pressure is less than 10% it
is generally acceptable to use a conventional valve
without any provision for back pressure.
• Since the gauge back pressure ratio is more than
10%, it is recommended to use a balanced bellows
valve. The capacity of the valve for a given
overpressure is affected by a back pressure
correction factor, KB, for balanced bellows valves on
compressible fluids, given by diagram 2.
KB = 0.94
Required discharge area :
A=
KUW " T Z
C K P1 KB "M
with KU=1.3164
A = 3.35cm2
• Next larger orifice,
A' = 5.06 cm2 (orifice H)
The valve flow is :
W' = (A'/A) x W
W' = 18.498 kg/h
• Valve selection :
Valve model number : P23 H2 430 (430 for
balanced bellows valves)
Option : lift lever (if necessary)
Dimensions :
A = 130.2 mm - B = 123.8 mm
Inlet 2" x 300 lbs - outlet 3" x 150 lbs
Note : the set pressure of the valve on the test
bench will be the actual set pressure without any
correction for back pressure.
2 - STEAM
A - Saturated steam
• Data :
Required flow of saturated steam :
W = 45360 kg/h
Set pressure :
P = 34.5 bar
Overpressure :
a = 10%
Absolute relieving pressure P1 = P + overpressure +
atmospheric pressure
P1 = 1.10 x P + 1.013 = 38.96 bar abs.
• STARFLOW discharge coefficient : K = 0.975
To find the discharge area, solve :
A=
W
KU K P1 KB KSH KN
with KU=52.5
A = 22.79 cm2
• Select the next larger orifice :
A' = 23.2 cm2 (orifice M)
• Valve selection : same as § B-1 above.
C-2 The variable back pressure exceeds 10%
of the set pressure. Same data as above with a
variable back pressure Pb(V), so that :
Pb(V) = 0 to 14.5 bar
Gauge back pressure ratio : Pb(V)/P1 ; %
100 x Pb(V)/P1 = 35%
TI-7-0213
Weir First choice for power and industrial protection
15
PRESSURE RELIEF VALVES
Sarasin-RSBD
The valve flow rate (including the 0.9 safety factor)
is :
W' = (A'/A) x W
W' = 46176 kg/h
• Select next larger orifice
A' = 5.73 cm2 (orifice H)
Actual flow of the valve is :
W' = A' x W
A
• Valve selection (see above)
Valve model number : P46 M2 530
Option : none
Dimensions :
A = 177.8 mm - B = 184.1 mm
Inlet 4" x 300 lbs - outlet 6" x 150 lbs
W' = 59.35 m3/h
B - Superheated steam
Same data as above, with a relieving temperature of
540°F/282°C
• Superheat correction factor, from table 3:
KSH = 0.96
KSH = 0.96
• Valve selection
Go to the H orifice selection table, with relieving
temperature (ambient), and find the valve model
number suitable for a set pressure of 10.34 bar :
P73 H1. As there is no back pressure : select the
conventional type and material code 330.
Valve model number : P73 H 1330
Dimensions :
A = 130.2 mm - B = 123.8 mm
Inlet 11⁄2" x 150 lbs - outlet 3" x 150 lbs
• Required discharge area:
(USCS)
(SI)
W
KU K P1 KB KSH
A=
with KU=51.5
A=
W
KU K P1 KB KSH
with KU=52.5
A = 3.68 in.2
A = 23.76 cm2
• Next larger orifice:
A’ = 4.34 in.2/28 cm2 (orifice)
• Valve selection (same as above):
Valve model number P46N2 530
Option : none
Dimensions : A 73⁄4"/196.8 mm - B = 81⁄4"/209.5 mm
Inlet 4"-300 lbs - Outlet 6"-150 lbs
Weight 300 lbs/136 kg
3 - INCOMPRESSIBLE FLUID (Liquid)
• Data : Type P valve (with K1 = 0.63)
Specific gravity :
G=1
Required flow
Q = 54.48 m3/h
Set pressure :
P = 10.34 bar
Overpressure :
! = 10%
Back pressure :
Pb = atmosphere
Discharge coefficient :
K = 0.63
To find the required discharge area, solve :
A=
Q"G
K KW KV KU"1.1P - Pb
with KU=5.092
KW and KV = 1
A = 5.26 cm2
16
Weir First choice for power and industrial protection
TI-7-0213
PRESSURE RELIEF VALVES
Sarasin-RSBD
Orifice tables
P series (Starflow)
Orifice
in2
Actual
API in2
Actual cm2
API cm2
D
E
F
G
H
J
K
L
M
N
P
Q
R
T
V
W
0.134
0.11
0.865
0.71
0.273
0.196
1.76
1.26
0.373
0.307
2.406
1.98
0.589
0.503
3.800
3.24
0.881
0.785
5.684
5.06
1.457
1.287
9.400
8.30
2.097
1.838
13.52
11.86
3.284
2.853
21.42
18.41
4.093
3.6
26.42
23.2
4.987
4.34
32.16
28.0
7.215
6.38
46.55
41.2
12.91
11.05
83.53
71.2
17.81
16
114.9
103.2
28.87
26
186.2
167.8
46.75
301.6
-
70.10
452.3
-
9 series
Orifice
B
D
E
F
G
Actual in2
API in2
Actual cm2
API cm2
0.044
0.283
-
0.124
0.11
0.801
0.71
0.222
0.196
1.431
1.26
0.352
0.307
2.27
1.98
0.568
0.503
3.664
3.24
76 series
Orifice
D
E
F
G
H
J
K
L
M
N
P
Actual in2
API in2
Actual cm2
API cm2
0.124
0.11
0.80
0.71
0.222
0.196
1.43
1.26
0.352
0.307
2.27
1.98
0.568
0.503
3.66
3.24
0.887
0.785
5.72
5.06
1.457
1.287
9.40
8.30
2.097
1.838
13.52
11.86
3.232
2.853
20.85
18.41
4.065
3.6
26.22
23.2
5.143
4.34
33.18
28
7.069
6.38
45.60
41.2
Q
R
S
12.915 15.9
22.19
11.05
16
83.32 102.58 143.16
71.2
103.2
-
T
28.27
26
182.39
167.8
U
W
39.44 61.63
254.47 397.61
-
78 series
Orifice
D
E
F
G
H
J
K
L
M
N
P
Q
R
Actual in2
API in2
Actual cm2
API cm2
0.124
0.11
0.80
0.71
0.222
0.196
1.43
1.26
0.352
0.307
2.27
1.98
0.568
0.503
3.66
3.24
0.887
0.785
5.72
5.06
1.457
1.287
9.40
8.30
2.097
1.838
13.529
11.86
3.229
2.853
20.83
18.41
4.095
3.6
26.42
23.2
5.143
4.34
33.18
28
7.069
6.38
45.60
41.2
12.915
11.05
83.32
71.2
T
15.904 28.274
16
26
102.61 182.41
103.2
167.8
86 series
Orifice
in2
Actual
API in2
Actual cm2
API cm2
D
E
F
G
H
J
K
L
M
N
P
Q
0.124
0.11
0.80
0.71
0.222
0.196
1.43
1.26
0.352
0.307
2.27
1.98
0.568
0.503
3.66
3.24
0.887
0.785
5.72
5.06
1.457
1.287
9.40
8.30
2.097
1.838
13.52
11.86
3.232
2.853
20.85
18.41
4.065
3.6
26.22
23.2
5.143
4.34
33.18
28
7.069
6.38
45.60
41.2
R
S
12.915 15.9
22.19
11.05
16
83.32 102.58 143.16
71.2
103.2
-
T
U
W
28.27
26
182.39
167.8
39.44
254.47
-
61.63
397.61
-
V series (Starsteam)
Orifice
1
2
3
4
5
6
Q
R
Actual in2
0.996
1.667
2,758
3,983
5.303
7.069
11.056
15.904
Actual cm2
6.424
10.752 17.795
25.697
34.212
45.604
RR
T
19.296 27.391
71.331 102.608 124.492 176.715
P Series (Starflow) Selection Tables
How to use the selection tables
Example :
The correct Starflow model number may be selected by using the following selection tables
or the selection diagrams on the following pages. These tables and have been established
according to API STD 526 last edition, whilst the diagrams have been established according
to ASME B16.34 last edition. There are selection tables and selection diagrams for each orifice
size from D to T (API STD 526) +V and W (ASME B16.34).
What is the model number for a ‘D’ orifice, set at 40 barg
and 135°C ?
When the valve orifice size has been selected according to the duty requirements as well as
the applicable sizing formula or capacity table (see the sizing section in our technical
information catalogue), select the applicable selection table or diagram. In the applicable
selection table or diagram, for the specified service temperature, select the valve in
accordance with the required set pressure. Selection diagrams should be used for
interpolations.
The table or diagram then specifies the 5 first digits of the Starflow coding system. The table
also shows the 3 following digits which refer to the service conditions (conventional-balanced
bellows steam), as well as the inlet and outlet sizes and ratings, the maximum allowable back
pressure and the body and spring materials.
Refer to the table of dimensions for geometric data and weight.
TI-7-0213
•
Go to the ‘D’ orifice selection chart and find
the location of the intersection 135°C - 40 barg
•
Read the model number : P12D2330
(conventional), 1" x D x 2" rating 300 lbs,
inlet 1" - 300 lbs, outlet 2" - 150 lbs,
A = 104.8 mm, B = 114.3 mm, weight : 18 kg.
Notes :
These tables and diagrams have been issued according to
API STD 526 and ASME B16.34. Therefore they do not take
into consideration such parameters as corrosion and special
service requirements. This data should be considered when
selecting a model number. Refer to the section of this
catalogue dealing with the different bills of material.
Weir First choice for power and industrial protection
17
PRESSURE RELIEF VALVES
Sarasin-RSBD
P Series (Starflow) Selection Tables
According to API Std 526 : (edition 2009)
ORIFICE : D
0.71 cm2
0.11 in2
INLETx
ORIFICEx
OUTLET
ANSI
FLANGE
RATING
Inlet
Outlet
Model Conven- Bellows
Number tional
Steam
service
MAX. SET PRESSURE
barg (psig)
-29°C
to +38°C
<232°C
(-20°F
(<450°F)
to 100°F)
-268°C
-46°C
to -47°C to -29°C
(-450°F
(-50°F
to -51°F) to -21°F)
<427°C
(<800°F)
MAX. BACK
PRESSURE (1)
barg (psig)
<538°C Conven- Bellows
(<1000°F) tional
1D2
150
150
P12D1
330
430
530
19.8 (285)
13 (185)
5.5 (80)
19.8 (285) 16 (230)
1D2
300
150
P12D7
330
430
530
19.8 (285)
19.8 (285)
19.8 (285)
19.8 (285) 16 (230)
1D2
300
150
P12D2
330
430
530
51 (740)
42.4 (615)
29 (410)
19.8 (285) 16 (230)
1D2
600
150
P12D3
330
430
530
102 (1480)
85 (1235)
58 (825)
19.8 (285) 16 (230)
11⁄2 D 2
900
300
P72D4
330
430
530
153 (2220)
128 (1845)
86 (1235)
41 (600)
35 (500)
11⁄2 D 2
1500
300
P72D5
330
430
530
255 (3705)
213 (3080)
144 (2060)
41 (600)
35 (500)
11⁄2 D 3 (4)
2500
300
P73D6
330
430
530
414 (6000)
414 (6000)
240 (3430)
51 (740)
35 (500)
1D2
300
150
P12D2
332
432
502
35 (510)
16 (225)
19.8 (285) 16 (230)
19.8 (285) 16 (230)
1D2
600
150
P12D3
332
432
502
70 (1015)
32 (445)
11⁄2 D 2
900
300
P72D4
332
432
502
105 (1525)
46 (670)
41 (600)
35 (500)
11⁄2 D 2
1500
300
P72D5
332
432
502
176 (2540)
79 (1115)
41 (600)
35 (500)
11⁄2 D 3 (4)
2500
300
P73D6
332
432
502
293 (4230)
128 (1860)
51 (740)
35 (500)
1D2
150
150
P12D1
319
419
19.8 (285)
19.8 (285) 16 (230)
1D2
300
150
P12D7
319
419
19.8 (285)
19.8 (285) 16 (230)
1D2
300
150
P12D2
319
419
51 (740)
19.8 (285) 16 (230)
1D2
600
150
P12D3
319
419
102 (1480)
19.8 (285) 16 (230)
11⁄2 D 2
900
300
P72D4
319
419
153 (2220)
41 (600)
35 (500)
1 ⁄2 D 2
1500
300
P72D5
319
419
255 (3705)
41 (600)
35 (500)
11⁄2 D 3 (4)
2500
300
P73D6
319
419
414 (6000)
51 (740)
35 (500)
1
1D2
150
150
P12D1
316
416
19 (275)
19 (275)
16 (230)
1D2
300
150
P12D7
316
416
19 (275)
19 (275)
16 (230)
1D2
300
150
P12D2
316
416
50 (720)
19 (275)
16 (230)
1D2
600
150
P12D3
316
416
99 (1440)
19 (275)
16 (230)
1 ⁄2D 2
900
300
P72D4
316
416
149 (2160)
41 (600)
35 (500)
11⁄2 D 2
1500
300
P72D5
316
416
248 (3600)
41 (600)
35 (500)
11⁄2 D 3 (4)
2500
300
P73D6
316
416
276 (4000)
50 (720)
35 (500)
1
MATERIALS
Body
Spring
SA 216
Alloy
Gr. WCC
Steel
SA 216
High Temp.
Gr. WC6
Alloy
Steel
SA 352
Alloy
Gr. LCC
Steel
SA 351
Stainless
Gr. CF8M
Steel
D
C
⁄2" NPT
1
A
N E
B
INLETx
ORIFICEx
OUTLET
ANSI FLANGE
RATING
Inlet
Outlet
MODEL
A(2)
B(2)
C
D
E
N
NUMBER
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
Approximate
weight (3)
kg (lbs)
1D2
150
150
P12D1
104.8 (4-1⁄8)
114.3 (4-1⁄2)
375 (15)
19.1 (3⁄4)
31 (1-1⁄4)
12 (1⁄2)
18 (40)
1D2
300
150
P12D7
104.8 (4-1⁄8)
114.3 (4-1⁄2)
375 (15)
19.1 (3⁄4)
31 (1-1⁄4)
12 (1⁄2)
18 (40)
1D2
300
150
P12D2
104.8 (4-1⁄8)
114.3 (4-1⁄2)
375 (15)
19.1 (3⁄4)
31 (1-1⁄4)
12 (1⁄2)
18 (40)
1D2
600
150
P12D3
104.8 (4-1⁄8)
114.3 (4-1⁄2)
375 (15)
19.1 (3⁄4)
31 (1-1⁄4)
12 (1⁄2)
19 (42)
11⁄2 D 2
900
300
P72D4
104.8 (4-1⁄8)
139.7 (5-1⁄2)
480 (19)
22.4 (7⁄8)
46 (1-13⁄16)
13 (1⁄2)
35 (77)
11⁄2 D 2
1500
300
P72D5
104.8 (4-1⁄8)
139.7 (5-1⁄2)
480 (19)
22.4 (7⁄8)
46 (1-13⁄16)
13 (1⁄2)
36 (79)
11⁄2 D 3(4)
2500
300
P73D6
139.7 (5-1⁄2)
177.8 (7)
505 (20)
28.4 (11⁄8)
59 (2-5⁄16)
13 (1⁄2)
45 (99)
(1) Max. back pressure limits at 38°C; for higher temp. refer to ASME B16.5 flange ratings for conventional valves
(2) Tolerances for A and B : ± 1.6 mm (±1⁄16 in)
(3) Valves with lifting lever : add 10%
(4) 21⁄2'' outlet flange on request in conformity with API Std 526 ed.84, model becomes P75D6
18
Weir First choice for power and industrial protection
TI-7-0213
PRESSURE RELIEF VALVES
Sarasin-RSBD
Extrapolation from ASME B16.34:2004 & API Std 526:2009
Orifice D
P/T Selection Chart
440.00
430.00
420.00
410.00
400.00
390.00
380.00
370.00
2500# LCC
2500#
WCC
1500# LCC
1500#
WCC
900#
CF8M
900# LCC
360.00
900#
WCC
600#
CF8M
350.00
340.00
330.00
320.00
310.00
300.00
290.00
280.00
270.00
2500#
CF8M
Set Pressure (Barg)
260.00
250.00
240.00
230.00
220.00
210.00
1500#
CF8M
200.00
2500#
WC6
190.00
180.00
170.00
160.00
150.00
140.00
130.00
120.00
1500#
WC6
110.00
100.00
600# LCC
70.00
600#
WCC
300# LCC
80.00
300#
WCC
150# LCC
90.00
150#
WCC
900#
WC6
60.00
50.00
40.00
300#
CF8M
30.00
20.00
150#
CF8M
10.00
0.00
-200
-150
-100
-50
0
50
600#
WC6
300# Light
WCC
100
150
200
250
300
350
400
300#
WC6
450
500
550
Discharge Temperature (˚C)
CF8M (below -46˚C)
TI-7-0213
LCC
WCC (-29 to +427˚C)
WC6
Weir First choice for power and industrial protection
19
PRESSURE RELIEF VALVES
Sarasin-RSBD
P Series (Starflow) Selection Tables
According to API Std 526 : (edition 2009)
ORIFICE : E
1.26 cm2
0.196 in2
INLETx
ORIFICEx
OUTLET
ANSI
FLANGE
RATING
Inlet
Outlet
Model Conven- Bellows
Number tional
Steam
service
MAX. SET PRESSURE
barg (psig)
-29°C
to +38°C
<232°C
(-20°F
(<450°F)
to 100°F)
-268°C
-46°C
to -47°C to -29°C
(-450°F
(-50°F
to -51°F) to -21°F)
MAX. BACK
PRESSURE (1)
barg (psig)
<538°C Conven- Bellows
(<1000°F) tional
<427°C
(<800°F)
1E2
150
150
P12E1
330
430
530
19.8 (285)
13 (185)
5.5 (80)
19.8 (285) 16 (230)
1E2
300
150
P12E7
330
430
530
19.8 (285)
19.8 (285)
19.8 (285)
19.8 (285) 16 (230)
1E2
300
150
P12E2
330
430
530
51 (740)
42.4 (615)
29 (410)
19.8 (285) 16 (230)
1E2
600
150
P12E3
330
430
530
102 (1480)
85 (1235)
58 (825)
19.8 (285) 16 (230)
1 ⁄2 E 2
900
300
P72E4
330
430
530
153 (2220)
128 (1845)
86 (1235)
41 (600)
35 (500)
11⁄2 E 2
1500
300
P72E5
330
430
530
255 (3705)
213 (3080)
144 (2060)
41 (600)
35 (500)
11⁄2 E 3 (4)
2500
300
P73E6
330
430
530
414 (6000)
414 (6000)
240 (3430)
51 (740)
35 (500)
1E2
300
150
P12E2
332
432
502
1
35 (510)
16 (225)
19.8 (285) 16 (230)
19.8 (285) 16 (230)
1E2
600
150
P12E3
332
432
502
70 (1015)
32 (445)
11⁄2 E 2
900
300
P72E4
332
432
502
105 (1525)
46 (670)
41 (600)
35 (500)
11⁄2 E 2
1500
300
P72E5
332
432
502
176 (2540)
79 (1115)
41 (600)
35 (500)
11⁄2 E 3 (4)
2500
300
P73E6
332
432
502
293 (4230)
128 (1860)
51 (740)
35 (500)
1E2
150
150
P12E1
319
419
19.8 (285)
19.8 (285) 16 (230)
1E2
300
150
P12E7
319
419
19.8 (285)
19.8 (285) 16 (230)
1E2
300
150
P12E2
319
419
51 (740)
19.8 (285) 16 (230)
1E2
600
150
P12E3
319
419
102 (1480)
19.8 (285) 16 (230)
1 ⁄2 E 2
900
300
P72E4
319
419
153 (2220)
41 (600)
35 (500)
1
11⁄2 E 2
1500
300
P72E5
319
419
255 (3705)
41 (600)
35 (500)
11⁄2 E 3 (4)
2500
300
P73E6
319
419
414 (6000)
51 (740)
35 (500)
E2
150
150
P12E1
316
416
19 (275)
19 (275)
16 (230)
1E2
300
150
P12E7
316
416
19 (275)
19 (275)
16 (230)
1E2
300
150
P12E2
316
416
50 (720)
19 (275)
16 (230)
1E2
600
150
P12E3
316
416
99 (1440)
19 (275)
16 (230)
11⁄2 E 2
900
300
P72E4
316
416
149 (2160)
41 (600)
35 (500)
1 ⁄2 E 2
1500
300
P72E5
316
416
248 (3600)
41 (600)
35 (500)
11⁄2 E 3 (4)
2500
300
P73E6
316
416
276 (4000)
50 (720)
35 (500)
1
MATERIALS
Body
Spring
SA 216
Alloy
Gr. WCC
Steel
SA 216
High Temp.
Gr. WC6
Alloy
Steel
SA 352
Alloy
Gr. LCC
Steel
SA 351
Stainless
Gr. CF8M
Steel
D
C
⁄2" NPT
1
A
N
E
B
INLETx
ORIFICEx
OUTLET
ANSI FLANGE
RATING
Inlet
Outlet
MODEL
A(2)
B(2)
C
D
E
N
NUMBER
mm (in)
mm (in)
mm (in)
mm (in)
mm(in)
mm (in)
Approximate
weight (3)
kg (lbs)
1E2
150
150
P12E1
104.8 (4-1⁄8)
114.3 (4-1⁄2)
375 (15)
19.1 (3⁄4)
31 (1-1⁄4)
12 (1⁄2)
18 (40)
1E2
300
150
P12E7
104.8 (4-1⁄8)
114.3 (4-1⁄2)
375 (15)
19.1 (3⁄4)
31 (1-1⁄4)
12 (1⁄2)
18 (40)
1E2
300
150
P12E2
104.8 (4-1⁄8)
114.3 (4-1⁄2)
375 (15)
19.1 (3⁄4)
31 (1-1⁄4)
12 (1⁄2)
18 (40)
1E2
600
150
P72E3
104.8 (4-1⁄8)
114.3 (4-1⁄2)
375 (15)
19.1 (3⁄4)
31 (1-1⁄4)
12 (1⁄2)
19 (42)
11⁄2 E 2
900
300
P72E4
104.8 (4-1⁄8)
139.7 (5-1⁄2)
480 (19)
22.4 (7⁄8)
46 (1-13⁄16)
13 (1⁄2)
35 (77)
11⁄2 E 2
1500
300
P72E5
104.8 (4-1⁄8)
139.7 (5-1⁄2)
480 (19)
22.4 (7⁄8)
46 (1-13⁄16)
13 (1⁄2)
36 (79)
11⁄2 E 3(4)
2500
300
P73E6
139.7 (5-1⁄2)
177.8 (7)
505 (20)
28.4 (1-1⁄2)
59 (2-5⁄16)
13 (1⁄2)
45 (99)
(1) Max. back pressure limits at 38°C; for higher temp. refer to ASME B16.5 flange ratings for conventional valves
(2) Tolerances for A and B : ± 1.6 mm (±1⁄8 in)
(3) Valves with lifting lever : add 10%
(4) 21⁄2'' outlet flange on request in conformity with API Std 526 ed. 84, model becomes P75E6
20
Weir First choice for power and industrial protection
TI-7-0213
PRESSURE RELIEF VALVES
Sarasin-RSBD
Extrapolation from ASME B16.34:2004 & API Std 526:2009
Orifice E
P/T Selection Chart
440.00
430.00
420.00
410.00
400.00
390.00
380.00
370.00
2500# LCC
2500#
WCC
1500# LCC
1500#
WCC
900#
CF8M
900# LCC
360.00
900#
WCC
600#
CF8M
350.00
340.00
330.00
320.00
310.00
300.00
290.00
280.00
270.00
2500#
CF8M
Set Pressure (Barg)
260.00
250.00
240.00
230.00
220.00
210.00
1500#
CF8M
200.00
2500#
WC6
190.00
180.00
170.00
160.00
150.00
140.00
130.00
120.00
1500#
WC6
110.00
100.00
600# LCC
70.00
600#
WCC
300# LCC
80.00
300#
WCC
150# LCC
90.00
150#
WCC
900#
WC6
60.00
50.00
40.00
300#
CF8M
30.00
20.00
150#
CF8M
10.00
0.00
-200
-150
-100
-50
0
50
600#
WC6
300# Light
WCC
100
150
200
250
300
350
400
300#
WC6
450
500
550
Discharge Temperature (˚C)
CF8M (below -46˚C)
TI-7-0213
LCC
WCC (-29 to +427˚C)
WC6
Weir First choice for power and industrial protection
21
PRESSURE RELIEF VALVES
Sarasin-RSBD
P Series (Starflow) Selection Tables
According to API Std 526 : (edition 2009)
ORIFICE : F
1.98 cm2
0.307 in2
INLETx
ORIFICEx
OUTLET
ANSI
FLANGE
RATING
Inlet
Outlet
Model Conven- Bellows
Number tional
Steam
service
MAX. SET PRESSURE
barg (psig)
-29°C
to +38°C
<232°C
(-20°F
(<450°F)
to 100°F)
-268°C
-46°C
to -47°C to -29°C
(-450°F
(-50°F
to -51°F) to -21°F)
MAX. BACK
PRESSURE (1)
barg (psig)
<538°C Conven- Bellows
(<1000°F) tional
<427°C
(<800°F)
11⁄2 F 2
150
150
P72F1
330
430
530
19.8 (285)
13 (185)
5.5 (80)
19.8 (285) 16 (230)
11⁄2 F 2
300
150
P72F7
330
430
530
19.8 (285)
19.8 (285)
19.8 (285)
19.8 (285) 16 (230)
11⁄2 F 2
300
150
P72F2
330
430
530
51 (740)
42.4 (615)
29 (410)
19.8 (285) 16 (230)
11⁄2 F 2
600
150
P72F3
330
430
530
102 (1440)
85 (1235)
58 (825)
19.8 (285) 16 (230)
11⁄2 F 3 (4)
900
300
P73F4
330
430
530
153 (2220)
128 (1845)
85 (1235)
51 (740)
34 (500)
1 ⁄2 F 3 (4)
1500
300
P73F5
330
430
530
255 (3705)
213 (3080)
144 (2060)
51 (740)
34 (500)
11⁄2 F 3 (4)
2500
300
P73F6
330
430
530
345 (5000)
345 (5000)
240 (3430)
51 (740)
34 (500)
11⁄2 F 2
300
150
P72F2
332
432
502
35 (510)
15 (225)
19.8 (285) 16 (230)
11⁄2 F 2
600
150
P72F3
332
432
502
70 (1015)
31 (445)
19.8 (285) 16 (230)
11⁄2 F 3 (4)
900
300
P73F4
332
432
502
105 (1525)
46 (670)
51 (740)
34 (500)
11⁄2 F 3 (4)
1500
300
P73F5
332
432
502
175 (2540)
77 (1115)
51 (740)
34 (500)
11⁄2 F 3 (4)
2500
300
P73F6
332
432
502
292 (4230)
128 (1860)
51 (740)
34 (500)
1
11⁄2 F 2
150
150
P72F1
319
419
19.8 (285)
19.8 (285) 16 (230)
11⁄2 F 2
300
150
P72F7
319
419
19.8 (285)
19.8 (285) 16 (230)
11⁄2 F 2
300
150
P72F2
319
419
51 (740)
19.8 (285) 16 (230)
11⁄2 F 2
600
150
P72F3
319
419
102 (1440)
19.8 (285) 16 (230)
11⁄2 F 3 (4)
900
300
P73F4
319
419
153 (2220)
51 (740)
34 (500)
1 ⁄2 F 3 (4)
1500
300
P73F5
319
419
255 (3705)
51 (740)
34 (500)
11⁄2 F 3 (4)
2500
300
P73F6
319
419
345 (5000)
51 (740)
34 (500)
1
11⁄2 F 2
150
150
P72F1
316
416
19 (275)
19 (275)
16 (230)
11⁄2 F 2
300
150
P72F7
316
416
19 (275)
19 (275)
16 (230)
11⁄2 F 2
300
150
P72F2
316
416
50 (720)
19 (275)
16 (230)
11⁄2 F 2
600
150
P72F3
316
416
99 (1440)
19 (275)
16 (230)
1 ⁄2 F 3 (4)
900
300
P73F4
316
416
149 (2160)
50 (720)
34 (500)
1
11⁄2 F 3 (4)
1500
300
P73F5
316
416
152 (2200)
50 (720)
34 (500)
11⁄2 F 3 (4)
2500
300
P73F6
316
416
234 (3400)
50 (720)
34 (500)
MATERIALS
Body
Spring
SA 216
Alloy
Gr. WCC
Steel
SA 216
High Temp.
Gr. WC6
Alloy
Steel
SA 352
Alloy
Gr. LCC
Steel
SA 351
Stainless
Gr. CF8M
Steel
D
C
⁄2" NPT
1
A
N E
B
INLETx
ORIFICEx
OUTLET
ANSI FLANGE
RATING
Inlet
Outlet
MODEL
A(2)
B(2)
C
D
E
N
NUMBER
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
Approximate
weight (3)
kg (lbs)
11⁄2 F 2
150
150
P72F1
123.8 (4-7⁄8)
120.7 (4-3⁄4)
455 (18)
19.1 (3⁄4)
34 (1-5⁄16)
12 (1⁄2)
25 (55)
11⁄2 F 2
300
150
P72F7
123.8 (4-7⁄8)
120.7 (4-3⁄4)
455 (18)
19.1 (3⁄4)
36 (1-3⁄8)
12 (1⁄2)
27 (60)
11⁄2 F 2
300
150
P72F2
123.8 (4-7⁄8)
152.4 (6)
455 (18)
19.1 (3⁄4)
36 (1-3⁄8)
12 (1⁄2)
27 (60)
11⁄2 F 2
600
150
P72F3
123.8 (4-7⁄8)
152.4 (6)
455 (18)
19.1 (3⁄4)
36 (1-3⁄8)
12 (1⁄2)
31 (68)
11⁄2 F 3 (4)
900
300
P73F4
123.8 (4-7⁄8)
165.1 (6-1⁄2)
505 (20)
28.4 (1-1⁄8)
46 (1-13⁄16)
13 (1⁄2)
44 (97)
11⁄2 F 3 (4)
1500
300
P73F5
123.8 (4-7⁄8)
165.1 (6-1⁄2)
505 (20)
28.4 (1-1⁄8)
46 (1-13⁄16)
13 (1⁄2)
44 (97)
11⁄2 F 3 (4)
2500
300
P73F6
139.7 (5-1⁄2)
177.8 (7)
505 (20)
28.4 (1-1⁄8)
59 (2-5⁄16)
13 (1⁄2)
48 (108)
(1) Max. back pressure limits at 38°C; for higher temp. refer to ASME B16.5 flange ratings for conventional valves
(2) Tolerances for A and B : ± 1.6 mm (±1⁄16 in)
(3) Valves with lifting lever : add 10%
(4) 21⁄2'' outlet flange on request in conformity with API Std 526 ed. 84, model becomes P75F
22
Weir First choice for power and industrial protection
TI-7-0213
PRESSURE RELIEF VALVES
Sarasin-RSBD
Extrapolation from ASME B16.34:2004 & API Std 526:2009
Orifice F
P/T Selection Chart
350.00
340.00
330.00
320.00
2500# LCC
310.00
300.00
2500#
WCC
2500# CF8M
290.00
280.00
270.00
260.00
250.00
240.00
230.00
1500# LCC
220.00
210.00
Set Pressure (Barg)
200.00
2500#
CF8M
190.00
2500#
WC6
1500#
WCC
180.00
170.00
160.00
1500# CF8M
150.00
130.00
900#
CF8M
120.00
900# LCC
140.00
900#
WCC
1500#
WC6
110.00
100.00
80.00
600#
CF8M
70.00
600# LCC
90.00
600#
WCC
900#
WC6
60.00
50.00
300#
CF8M
300# LCC
30.00
600#
WC6
300#
WCC
150#
CF8M
150# LCC
40.00
150#
WCC
20.00
10.00
300# Light
WCC
300#
WC6
0.00
-200
-150
-100
-50
0
50
100
150
200
250
300
350
400
450
500
550
Discharge Temperature (˚C)
CF8M (below -46˚C)
TI-7-0213
LCC
WCC (-29 to +427˚C)
WC6
Weir First choice for power and industrial protection
23
PRESSURE RELIEF VALVES
Sarasin-RSBD
P Series (Starflow) Selection Tables
According to API Std 526 : (edition 2009)
ORIFICE : G
3.24 cm2
0.503 in2
INLETx
ORIFICEx
OUTLET
ANSI
FLANGE
RATING
Inlet
Outlet
Model Conven- Bellows
Number tional
Steam
service
MAX. SET PRESSURE
barg (psig)
-29°C
to +38°C
<232°C
(-20°F
(<450°F)
to 100°F)
-268°C
-46°C
to -47°C to -29°C
(-450°F
(-50°F
to -51°F) to -21°F)
<427°C
(<800°F)
MAX. BACK
PRESSURE (1)
barg (psig)
<538°C Conven- Bellows
(<1000°F) tional
11⁄2 G 3 (4)
150
150
P73G1
330
430
530
19.8 (285)
13 (185)
5.5 (80)
19.8 (285) 16 (230)
11⁄2 G 3 (4)
300
150
P73G7
330
430
530
19.8 (285)
19.8 (285)
19.8 (285)
19.8 (285) 16 (230)
11⁄2 G 3 (4)
300
150
P73G2
330
430
530
51 (745)
42.4 (615)
29 (410)
19.8 (285) 16 (230)
11⁄2 G 3 (4)
600
150
P73G3
330
430
530
102 (1440)
85 (1235)
58 (825)
19.8 (285) 16 (230)
1 ⁄2 G 3 (4)
900
300
P73G4
330
430
530
153 (2220)
127 (1845)
85 (1235)
51 (740)
32 (470)
2G3
1500
300
P23G5
330
430
530
255 (3705)
212 (3080)
144 (2060)
51 (740)
32 (470)
255 (3705)
255 (3705)
240 (3430)
51 (740)
32 (470)
1
2G3
2500
300
P23G6
330
430
530
11⁄2 G 3 (4)
300
150
P73G2
332
432
502
11⁄2 G 3 (4)
600
150
P73G3
332
432
502
11⁄2 G 3 (4)
900
300
P73G4
332
432
502
2G3
1500
300
P23G5
332
432
502
2G3
2500
300
P23G6
332
432
502
35 (510)
15 (225)
19.8 (285) 16 (230)
70 (1015)
31 (445)
19.8 (285) 16 (230)
105 (1525)
46 (670)
51 (740)
34 (500)
175 (2540)
77 (1115)
51 (740)
34 (500)
255 (3705)
128 (1860)
51 (740)
34 (500)
11⁄2 G 3 (4)
150
150
P73G1
319
419
19.8 (285)
11⁄2 G 3 (4)
300
150
P73G7
319
419
19.8 (285)
19.8 (285) 16 (230)
11⁄2 G 3 (4)
300
150
P73G2
319
419
51 (745)
19.8 (285) 16 (230)
11⁄2 G 3 (4)
600
150
P73G3
319
419
102 (1440)
19.8 (285) 16 (230)
1 ⁄2 G 3 (4)
900
300
P73G4
319
419
153 (2220)
1
MATERIALS
Body
Spring
SA 216
Alloy
Gr. WCC
Steel
SA 216
High Temp.
Gr. WC6
Alloy
Steel
19.8 (285) 16 (230)
51 (740)
32 (470)
2G3
1500
300
P23G5
319
419
255 (3705)
51 (740)
32 (470)
2G3
2500
300
P23G6
319
419
255 (3705)
51 (740)
32 (470)
11⁄2 G 3 (4)
150
150
P73G1
316
416
19 (275)
19 (275)
16 (230)
11⁄2 G 3 (4)
300
150
P73G7
316
416
19 (275)
19 (275)
16 (230)
11⁄2 G 3 (4)
300
150
P73G2
316
416
50 (720)
19 (275)
16 (230)
11⁄2 G 3 (4)
600
150
P73G3
316
416
99 (1440)
19 (275)
16 (230)
11⁄2 G 3 (4)
900
300
P73G4
316
416
110 (1600)
50 (720)
34 (500)
2G3
1500
300
P23G5
316
416
169 (2450)
50 (720)
34 (500)
2G3
2500
300
P23G6
316
416
179 (2600)
50 (720)
34 (500)
SA 352
Alloy
Gr. LCC
Steel
SA 351
Stainless
Gr. CF8M
Steel
D
C
⁄2" NPT
1
A
N E
B
INLETx
ORIFICEx
OUTLET
ANSI FLANGE
RATING
Inlet
Outlet
MODEL
A(2)
B(2)
C
D
E
N
NUMBER
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
Approximate
weight (3)
kg (lbs)
11⁄2 G 3 (4)
150
150
P73G1
123.8 (4-7⁄8)
120.7 (4-3⁄4)
455 (18)
23.9 (15⁄16)
31 (1-1⁄4)
12 (1⁄2)
11⁄2 G 3 (4)
300
150
P73G7
123.8 (4-7⁄8)
120.7 (4-3⁄4)
455 (18)
23.9 (15⁄16)
34 (1-5⁄16)
12 (1⁄2)
22 (48)
23 (51)
11⁄2 G 3 (4)
300
150
P73G2
123.8 (4-7⁄8)
152.4 (6)
455 (18)
23.9 (15⁄16)
36 (1-3⁄8)
12 (1⁄2)
25 (55)
11⁄2 G 3 (4)
600
150
P73G3
123.8 (4-7⁄8)
152.4 (6)
455 (18)
23.9 (15⁄16)
36 (1-3⁄8)
12 (1⁄2)
26 (57)
11⁄2 G 3 (4)
900
300
P73G4
123.8 (4-7⁄8)
165.1 (6-1⁄2)
505 (20)
28.4 (1-1⁄8)
46 (1-13⁄16)
13 (1⁄2)
42 (93)
2G3
1500
300
P23G5
155.6 (6-1⁄8)
171.5 (6-3⁄4)
570 (23)
28.4 (1-1⁄8)
51 (2)
16 (5⁄8)
55 (121)
2G3
2500
300
P23G6
155.6 (6-1⁄8)
171.5 (6-3⁄4)
570 (23)
28.4 (1-1⁄8)
67 (2-5⁄8)
16 (5⁄8)
61 (134)
(1) Max. back pressure limits at 38°C; for higher temp. refer to ASME B16.5 flange ratings for conventional valves
(2) Tolerances for A and B : ± 1.6 mm (±1⁄16 in)
(3) Valves with lifting lever : add 10%
(4) 21⁄2'' outlet flange on request in conformity with API Std 526 ed. 84, model becomes P75G
24
Weir First choice for power and industrial protection
TI-7-0213
PRESSURE RELIEF VALVES
Sarasin-RSBD
Extrapolation from ASME B16.34:2004 & API Std 526:2009
Orifice G
P/T Selection Chart
2500# CF8M
260.00
250.00
240.00
2500#
WCC
230.00
1500# CF8M
220.00
2500#
WC6
2500# LCC
210.00
200.00
1500#
WCC
190.00
180.00
2500#
CF8M
170.00
1500#
CF8M
160.00
140.00
130.00
900#
CF8M
900# LCC
Set Pressure (Barg)
150.00
900#
WCC
1500#
WC6
120.00
110.00
100.00
80.00
600#
CF8M
600# LCC
90.00
900#
WC6
600#
WCC
70.00
60.00
50.00
300#
CF8M
300# LCC
40.00
300#
WCC
150#
CF8M
150# LCC
600#
WC6
150#
WCC
30.00
20.00
10.00
300# Light
WCC
300#
WC6
0.00
-200
-150
-100
-50
0
50
100
150
200
250
300
350
400
450
500
550
Discharge Temperature (˚C)
CF8M (below -46˚C)
TI-7-0213
LCC
WCC (-29 to +427˚C)
WC6
Weir First choice for power and industrial protection
25
PRESSURE RELIEF VALVES
Sarasin-RSBD
P Series (Starflow) Selection Tables
According to API Std 526 : (edition 2009)
ORIFICE : H
5.06 cm2
0.785 in2
INLETx
ORIFICEx
OUTLET
ANSI
FLANGE
RATING
Inlet
Outlet
Model Conven- Bellows
Number tional
Steam
service
MAX. SET PRESSURE
barg (psig)
-29°C
to +38°C
<232°C
(-20°F
(<450°F)
to 100°F)
-268°C
-46°C
to -47°C to -29°C
(-450°F
(-50°F
to -51°F) to -21°F)
MAX. BACK
PRESSURE (1)
barg (psig)
<538°C Conven- Bellows
(<1000°F) tional
<427°C
(<800°F)
11⁄2 H 3
150
150
P73H1
330
430
530
19.8 (285)
13 (185)
5.5 (80)
19.8 (285) 16 (230)
11⁄2 H 3
300
150
P73H7
330
430
530
19.8 (285)
19.8 (285)
19.8 (285)
19.8 (285) 16 (230)
2H3
300
150
P23H2
330
430
530
51 (740)
42.4 (615)
29 (410)
19.8 (285) 16 (230)
2H3
600
150
P23H3
330
430
530
102 (1480)
85 (1235)
58 (825)
19.8 (285) 16 (230)
2H3
900
150
P23H4
330
430
530
153 (2220)
127 (1845)
85 (1235)
19.8 (285) 16 (230)
2H3
1500
300
P23H5
330
430
530
190 (2750)
190 (2750)
144 (2060)
2H3
300
150
P23H2
332
432
502
2H3
600
150
P23H3
332
432
502
56 (815)
31 (445)
19.8 (285) 16 (230)
2H3
900
150
P23H4
332
432
502
84 (1225)
46 (670)
19.8 (285) 16 (230)
2H3
1500
300
P23H5
332
432
502
141 (2040)
77 (1115)
11⁄2 H 3
150
150
P73H1
319
419
19.8 (285)
35 (510)
51 (740)
15 (225)
Body
Spring
SA 216
Alloy
Gr. WCC
Steel
SA 216
High Temp.
Gr. WC6
Alloy
29 (415)
19.8 (285) 16 (230)
51 (740)
MATERIALS
Steel
29 (415)
19.8 (285) 16 (230)
11⁄2 H 3
300
150
P73H7
319
419
19.8 (285)
19.8 (285) 16 (230)
2H3
300
150
P23H2
319
419
51 (740)
19.8 (285) 16 (230)
SA 352
Alloy
2H3
600
150
P23H3
319
419
102 (1480)
19.8 (285) 16 (230)
Gr. LCC
Steel
2H3
900
150
P23H4
319
419
153 (2220)
19.8 (285) 16 (230)
2H3
1500
300
P23H5
319
419
11⁄2 H 3
150
150
P73H1
316
416
51 (740)
29 (415)
19 (275)
190 (2750)
19 (275)
16 (230)
11⁄2 H 3
300
150
P73H7
316
416
19 (275)
19 (275)
16 (230)
2H3
300
150
P23H2
316
416
50 (720)
19 (275)
16 (230)
SA 351
Stainless
2H3
600
150
P23H3
316
416
99 (1440)
19 (275)
16 (230)
Gr. CF8M
Steel
2H3
900
150
P23H4
316
416
102 (1485)
19 (275)
16 (230)
2H3
1500
300
P23H5
316
416
110 (1600)
29 (415)
29 (415)
D
C
⁄2" NPT
1
A
N E
B
INLETx
ORIFICEx
OUTLET
ANSI FLANGE
RATING
Inlet
Outlet
MODEL
A(2)
B(2)
C
D
E
N
NUMBER
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
Approximate
weight (3)
kg (lbs)
11⁄2 H 3
150
150
P73H1
130.2 (5-1⁄8)
123.8 (4-7⁄8)
460 (18)
23.9 (15⁄16)
33 (1-5⁄16)
14 (9⁄16)
23 (51)
11⁄2 H 3
300
150
P73H7
130.2 (5-1⁄8)
123.8 (4-7⁄8)
460 (18)
23.9 (15⁄16)
36 (1-3⁄8)
14 (9⁄16)
25 (55)
2H3
300
150
P23H2
130.2 (5-1⁄8)
123.8 (4-7⁄8)
460 (18)
23.9 (15⁄16)
38 (1-1⁄2)
14 (9⁄16)
27 (60)
2H3
600
150
P23H3
154 (6-1⁄16)
161.9 (6-3⁄8)
515 (20)
23.9 (15⁄16)
41 (1-9⁄16)
14 (9⁄16)
38 (84)
2H3
900
150
P23H4
154 (6-1⁄16)
161.9 (6-3⁄8)
570 (22-1⁄2)
23.9 (15⁄16)
55 (2-1⁄16)
14 (9⁄16)
51 (112)
2H3
1500
300
P23H5
154 (6-1⁄16)
161.9 (6-3⁄8)
570 (22-1⁄2)
28.4 (1-1⁄8)
55 (2-1⁄16)
14 (9⁄16)
55 (121)
(1) Max. back pressure limits at 38°C; for higher temp. refer to ASME B16.5 flange ratings for conventional valves
(2) Tolerances for A and B : ± 1.6 mm (±1⁄16 in)
(3) Valves with lifting lever : add 10%
26
Weir First choice for power and industrial protection
TI-7-0213
PRESSURE RELIEF VALVES
Sarasin-RSBD
Extrapolation from ASME B16.34:2004 & API Std 526:2009
Orifice H
P/T Selection Chart
200.00
1500# LCC
190.00
180.00
170.00
1500# CF8M
1500#
WCC
160.00
150.00
900# LCC
140.00
130.00
900#
WCC
1500#
WC6
110.00
1500#
CF8M
900# CF8M
100.00
90.00
80.00
600#
CF8M
600# LCC
Set Pressure (Barg)
120.00
900#
WC6
600#
WCC
70.00
60.00
50.00
300#
CF8M
300# LCC
600#
WC6
40.00
300#
WCC
30.00
150#
CF8M
10.00
150# LCC
20.00
300# Light
WCC
150#
WCC
300#
WC6
0.00
-200
-150
-100
-50
0
50
100
150
200
250
300
350
400
450
500
550
Discharge Temperature (˚C)
CF8M (below -46˚C)
TI-7-0213
LCC
WCC (-29 to +427˚C)
WC6
Weir First choice for power and industrial protection
27
PRESSURE RELIEF VALVES
Sarasin-RSBD
P Series (Starflow) Selection Tables
According to API Std 526 : (edition 2009)
ORIFICE : J
8.30 cm2
1.287 in2
INLETx
ORIFICEx
OUTLET
ANSI
FLANGE
RATING
Inlet
Outlet
Model Conven- Bellows
Number tional
Steam
service
MAX. SET PRESSURE
barg (psig)
-29°C
to +38°C
<232°C
(-20°F
(<450°F)
to 100°F)
-268°C
-46°C
to -47°C to -29°C
(-450°F
(-50°F
to -51°F) to -21°F)
<427°C
(<800°F)
MAX. BACK
PRESSURE (1)
barg (psig)
<538°C Conven- Bellows
(<1000°F) tional
MATERIALS
Body
Spring
2J3
150
150
P23J1
330
430
530
19.8 (285)
13 (185)
5.5 (80)
19.8 (285) 16 (230)
2J3
300
150
P23J7
330
430
530
19.8 (285)
19.8 (285)
19.8 (285)
19.8 (285) 16 (230)
3 J 4 (5)
300
150
P34J2
330
430
530
51 (740)
42.4 (615)
29 (410)
19.8 (285) 16 (230)
SA 216
Alloy
3 J 4 (5)
600
150
P34J3
330
430
530
102 (1480)
85 (1235)
58 (825)
19.8 (285) 16 (230)
Gr. WCC
Steel
3J4
900
150
P34J4
330
430
530
153 (2220)
127 (1845)
85 (1235)
19.8 (285) 16 (230)
3J4
1500
300
P34J5
330
430
530
186 (2700)
186 (2700)
144 (2060)
3 J 4 (5)
300
150
P34J2
332
432
502
SA 216
High Temp.
Gr. WC6
Alloy
35 (510)
41 (600)
15 (225)
16 (230)
19.8 (285) 16 (230)
3 J 4 (5)
600
150
P34J3
332
432
502
56 (815)
31 (445)
19.8 (285) 16 (230)
3J4
900
150
P34J4
332
432
502
84 (1225)
46 (670)
19.8 (285) 16 (230)
3J4
1500
300
P34J5
332
432
502
141 (2040)
77 (1115)
2J3
150
150
P23J1
319
419
19.8 (285)
19.8 (285) 16 (230)
41 (600)
Steel
16 (230)
2J3
300
150
P23J7
319
419
19.8 (285)
19.8 (285) 16 (230)
3 J 4 (5)
300
150
P34J2
319
419
51 (740)
19.8 (285) 16 (230)
SA 352
Alloy
3 J 4 (5)
600
150
P34J3
319
419
102 (1480)
19.8 (285) 16 (230)
Gr. LCC
Steel
3J4
900
150
P34J4
319
419
153 (2220)
19.8 (285) 16 (230)
3J4
1500
300
P34J5
319
419
2J3
150
150
P23J1
316
416
41 (600)
16 (230)
19 (275)
186 (2700)
19 (275)
16 (230)
2J3
300
150
P23J7
316
416
19 (275)
19 (275)
16 (230)
3 J 4 (5)
300
150
P34J2
316
416
34 (500)
19 (275)
16 (230)
SA 351
Stainless
3 J 4 (5)
600
150
P34J3
316
416
43 (625)
19 (275)
16 (230)
Gr. CF8M
Steel
3J4
900
150
P34J4
316
416
55 (800)
19 (275)
16 (230)
3J4
1500
300
P34J5
316
416
55 (800)
41 (600)
16 (230)
D
C
⁄2" NPT
1
A
N E
B
INLETx
ORIFICEx
OUTLET
ANSI FLANGE
RATING
Inlet
Outlet
MODEL
A(2)
B(2)
C
D
E
N
NUMBER
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
Approximate
weight (3)
kg (lbs)
2J3
150
150
P23J1
136.5 (5-3⁄8)
123.8 (4-7⁄8)
515 (20)
23.9 (15⁄16)
33 (1-5⁄16)
14 (9⁄16)
2J3
300
150
P23J7
136.5 (5-3⁄8)
123.8 (4-7⁄8)
515 (20)
23.9 (15⁄16)
38 (1-1⁄2)
14 (9⁄16)
33 (73)
35 (77)
3 J 4 (5)
300
150
P34J2
184.1 (7-1⁄4)
181 (7-1⁄8)
550 (22)
23.9 (15⁄16)
44 (1-3⁄4)
14 (9⁄16)
49 (108)
60 (132)
3 J 4 (5)
600
150
P34J3
184.1 (7-1⁄4)
181 (7-1⁄8)
590 (23)
23.9 (15⁄16)
47 (1-7⁄8)
14 (9⁄16)
3J4
900
150
P34J4
184.1 (7-1⁄4)
181 (7-1⁄8)
765 (30)
23.9 (15⁄16)
54 (2-1⁄16)
14 (9⁄16)
97 (213)
3J4
1500
300
P34J5
184.1 (7-1⁄4)
181 (7-1⁄8)
765 (30)
31.8 (1-1⁄4)
64 (2-1⁄2)
14 (9⁄16)
108 (238)
(1) Max. back pressure limits at 38°C; for higher temp. refer to ASME B16.5 flange ratings for conventional valves
(2) Tolerances for A and B : ± 1.6 mm (±1⁄16 in)
(3) Valves with lifting lever : add 10%
(5) 21⁄2'' inlet flange on request in conformity with API Std 526 ed. 84, model becomes P54J
28
Weir First choice for power and industrial protection
TI-7-0213
PRESSURE RELIEF VALVES
Sarasin-RSBD
Extrapolation from ASME B16.34:2004 & API Std 526:2009
Orifice J
P/T Selection Chart
1500# CF8M
190.00
180.00
1500#
WCC
1500# LCC
170.00
160.00
150.00
900# CF8M
140.00
900#
WCC
900# LCC
130.00
120.00
1500#
WC6
100.00
90.00
600# CF8M
Set Pressure (Barg)
110.00
600# LCC
80.00
70.00
900#
WC6
600#
WCC
60.00
900# &
1500#
CF8M
600#
CF8M
600#
WC6
300# LCC
40.00
300#
WCC
150# LCC
50.00
150#
WCC
30.00
300#
CF8M
20.00
150#
CF8M
10.00
300# Light
WCC
300#
WC6
0.00
-200
-150
-100
-50
0
50
100
150
200
250
300
350
400
450
500
550
Discharge Temperature (˚C)
CF8M (below -46˚C)
TI-7-0213
LCC
WCC (-29 to +427˚C)
WC6
Weir First choice for power and industrial protection
29
PRESSURE RELIEF VALVES
Sarasin-RSBD
ORIFICE : K
11.86 cm2
1.838 in2
INLETx
ORIFICEx
OUTLET
P Series (Starflow) Selection Tables
According to API Std 526 : (edition 2009)
ANSI
FLANGE
RATING
Inlet
Outlet
Model Conven- Bellows
Number tional
Steam
service
MAX. SET PRESSURE
barg (psig)
-29°C
to +38°C
<232°C
(-20°F
(<450°F)
to 100°F)
-268°C
-46°C
to -47°C to -29°C
(-450°F
(-50°F
to -51°F) to -21°F)
<427°C
(<800°F)
MAX. BACK
PRESSURE (1)
barg (psig)
<538°C Conven- Bellows
(<1000°F) tional
MATERIALS
Body
Spring
3K4
150
150
P34K1
330
430
530
19.8 (285)
13 (185)
5.5 (80)
19.8 (285) 10 (150)
3K4
300
150
P34K7
330
430
530
19.8 (285)
19.8 (285)
19.8 (285)
19.8 (285) 10 (150)
3K4
300
150
P34K2
330
430
530
51 (740)
42.4 (615)
29 (410)
19.8 (285) 10 (150)
SA 216
Alloy
3K4
600
150
P34K3
330
430
530
102 (1480)
85 (1235)
58 (825)
19.8 (285) 14 (200)
Gr. WCC
Steel
3K6
900
150
P36K4
330
430
530
153 (2220)
127 (1845)
85 (1235)
19.8 (285) 14 (200)
3K6
1500
300
P36K5
330
430
530
153 (2220)
153 (2220)
144 (2060)
3K4
300
150
P34K2
332
432
502
35 (510)
15 (225)
19.8 (285) 10 (150)
3K4
600
150
P34K3
332
432
502
56 (815)
31 (445)
19.8 (285) 14 (200)
SA 216
High Temp.
19.8 (285) 14 (200)
Gr. WC6
Alloy
41 (600)
3K6
900
150
P36K4
332
432
502
84 (1225)
46 (670)
3K6
1500
300
P36K5
332
432
502
141 (2040)
77 (1115)
41 (600)
14 (200)
Steel
14 (200)
3K4
150
150
P34K1
319
419
19.8 (285)
19.8 (285) 10 (150)
3K4
300
150
P34K7
319
419
19.8 (285)
19.8 (285) 10 (150)
3K4
300
150
P34K2
319
419
51 (740)
19.8 (285) 10 (150)
SA 352
Alloy
3K4
600
150
P34K3
319
419
102 (1480)
19.8 (285) 14 (200)
Gr. LCC
Steel
3K6
900
150
P36K4
319
419
153 (2220)
19.8 (285) 14 (200)
3K6
1500
300
P36K5
319
419
41 (600)
14 (200)
3K4
150
150
P34K1
316
416
19 (275)
19 (275)
10 (150)
3K4
300
150
P34K7
316
416
19 (275)
19 (275)
10 (150)
3K4
300
150
P34K2
316
416
36 (525)
19 (275)
10 (150)
SA 351
Stainless
3K4
600
150
P34K3
316
416
41 (600)
19 (275)
14 (200)
Gr. CF8M
Steel
3K6
900
150
P36K4
316
416
41 (600)
19 (275)
14 (200)
3K6
1500
300
P36K5
316
416
52 (750)
41 (600)
14 (200)
153 (2220)
D
C
⁄2" NPT
1
A
N E
B
INLETx
ORIFICEx
OUTLET
ANSI FLANGE
RATING
Inlet
Outlet
MODEL
A(2)
B(2)
C
D
E
N
NUMBER
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
Approximate
weight (3)
kg (lbs)
3K4
150
150
P34K1
155.5 (6-1⁄8)
161.9 (6-3⁄8)
580 (23)
23.9 (15⁄16)
39 (1-1⁄4)
14 (9⁄16)
49 (108)
3K4
300
150
P34K7
155.5 (6-1⁄8)
161.9 (6-3⁄8)
580 (23)
23.9 (15⁄16)
45 (1-3⁄4)
14 (9⁄16)
54 (120)
3K4
300
150
P34K2
155.5 (6-1⁄8)
161.9 (6-3⁄8)
580 (23)
23.9 (15⁄16)
45 (1-3⁄4)
14 (9⁄16)
56 (123)
3K4
600
150
P34K3
184.1 (7-1⁄4)
181 (7-1⁄8)
635 (25)
23.9 (15⁄16)
47 (1-7⁄8)
14 (9⁄16)
68 (150)
3K6
900
150
P36K4
198.4 (7-13⁄16)
215.9 (8-1⁄2)
785 (31)
25.4 (1)
53 (2-1⁄16)
14 (9⁄16)
112 (247)
3K6
1500
300
P36K5
196.8 (7-3⁄4)
215.9 (8-1⁄2)
785 (31)
36.6 (1-7⁄16)
63 (2-7⁄16)
14 (9⁄16)
125 (275)
(1) Max. back pressure limits at 38°C; for higher temp. refer to ASME B16.5 flange ratings for conventional valves
(2) Tolerances for A and B : ± 1.6 mm (±1⁄16 in)
(3) Valves with lifting lever : add 10%
30
Weir First choice for power and industrial protection
TI-7-0213
PRESSURE RELIEF VALVES
Sarasin-RSBD
Extrapolation from ASME B16.34:2004 & API Std 526:2009
Orifice K
P/T Selection Chart
1500# CF8M
160.00
150.00
1500#
WCC
900# & 1500# LCC
140.00
130.00
900#
WCC
120.00
900# CF8M
2500#
WC6
110.00
600# LCC
90.00
80.00
600#
WCC
1500#
WC6
70.00
600# CF8M
Set Pressure (Barg)
100.00
60.00
50.00
1500#
CF8M
600# & 900#
CF8M
30.00
600#
WC6
300# LCC
40.00
300#
WCC
300#
CF8M
20.00
150#
CF8M
150# LCC
10.00
300# Light
WCC
300#
WC6
150#
WCC
0.00
-200
-150
-100
-50
0
50
100
150
200
250
300
350
400
450
500
550
Discharge Temperature (˚C)
CF8M (below -46˚C)
TI-7-0213
LCC
WCC (-29 to +427˚C)
WC6
Weir First choice for power and industrial protection
31
PRESSURE RELIEF VALVES
Sarasin-RSBD
ORIFICE : L
18.41 cm2
2.853 in2
INLETx
ORIFICEx
OUTLET
P Series (Starflow) Selection Tables
According to API Std 526 : (edition 2009)
ANSI
FLANGE
RATING
Inlet
Outlet
Model Conven- Bellows
Number tional
Steam
service
MAX. SET PRESSURE
barg (psig)
-29°C
to +38°C
<232°C
(-20°F
(<450°F)
to 100°F)
-268°C
-46°C
to -47°C to -29°C
(-450°F
(-50°F
to -51°F) to -21°F)
<427°C
(<800°F)
MAX. BACK
PRESSURE (1)
barg (psig)
<538°C Conven- Bellows
(<1000°F) tional
MATERIALS
Body
Spring
3L4
150
150
P34L1
330
430
530
19.8 (285)
13 (185)
5.5 (80)
19.8 (285) 7 (100)
3L4
300
150
P34L7
330
430
530
19.8 (285)
19.8 (285)
19.8 (285)
19.8 (285) 7 (100)
4L6
300
150
P46L2
330
430
530
51 (740)
42.4 (615)
28 (410)
19.8 (285) 12 (170)
SA 216
Alloy
4L6
600
150
P46L3
330
430
530
69 (1000)
69 (1000)
57 (825)
19.8 (285) 12 (170)
Gr. WCC
Steel
4L6
900
150
P46L4
330
430
530
103 (1500)
103 (1500)
85 (1235)
19.8 (285) 12 (170)
4L6
1500
150
P46L5
330
430
530
103 (1500)
103 (1500)
4L6
300
150
P46L2
332
432
502
4L6
600
150
P46L3
332
432
502
SA 216
High Temp.
4L6
900
150
P46L4
332
432
502
Gr. WC6
Alloy
4L6
1500
150
P46L5
332
432
502
103 (1500)
3L4
150
150
P34L1
319
419
19.8 (285)
3L4
300
150
P34L7
319
419
19.8 (285)
19.8 (285) 7 (100)
4L6
300
150
P46L2
319
419
51 (740)
19.8 (285) 12 (170)
4L6
600
150
P46L3
319
419
69 (1000)
19.8 (285) 12 (170)
4L6
900
150
P46L4
319
419
103 (1500)
19.8 (285) 12 (170)
3L4
150
150
P34L1
316
416
19 (275)
19 (275)
7 (100)
3L4
300
150
P34L7
316
416
19 (275)
19 (275)
7 (100)
4L6
300
150
P46L2
316
416
37 (535)
19 (275)
12 (170)
4L6
600
150
P46L3
316
416
37 (535)
19 (275)
12 (170)
4L6
900
150
P46L4
316
416
48 (700)
19 (275)
12 (170)
19.8 (285) 12 (170)
35 (510)
16 (225)
19.8 (285) 12 (170)
69 (1000)
31 (445)
19.8 (285) 12 (170)
103 (1500)
46 (670)
19.8 (285) 12 (170)
76 (1115)
19.8 (285) 12 (170)
Steel
19.8 (285) 7 (100)
SA 352
Alloy
Gr. LCC
Steel
SA 351
Stainless
Gr. CF8M
Steel
D
C
⁄2" NPT
1
A
N E
B
INLETx
ORIFICEx
OUTLET
ANSI FLANGE
RATING
Inlet
Outlet
MODEL
A(2)
B(2)
C
D
E
N
NUMBER
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
Approximate
weight (3)
kg (lbs)
3L4
150
150
P34L1
155.6 (6-1⁄8)
165.1 (6-1⁄2)
580 (23)
23.9 (15⁄16)
39 (1-1⁄2)
14 (9⁄16)
51 (112)
3L4
300
150
P34L7
155.6 (6-1⁄8)
165.1 (6-1⁄2)
580 (23)
23.9 (15⁄16)
45 (1-3⁄4)
14 (9⁄16)
57 (126)
4L6
300
150
P46L2
179.4 (7-1⁄16)
181 (7-1⁄8)
785 (31)
25.4 (1)
49 (1-15⁄16)
15.5 (5⁄8)
95 (210)
4L6
600
150
P46L3
179.4 (7-1⁄16)
203.2 (8)
845 (34)
25.4 (1)
56 (2-1⁄4)
15.5 (5⁄8)
115 (254)
4L6
900
150
P46L4
196.9 (7-3⁄4)
222.2 (8-3⁄4)
875 (35)
25.4 (1)
68 (2-11⁄16)
14.5 (9⁄16)
140 (310)
4L6
1500
150
P46L5
196.9 (7-3⁄4)
222.2 (8-3⁄4)
875 (35)
25.4 (1)
68 (2-11⁄16)
14.5 (9⁄16)
155 (342)
(1) Max. back pressure limits at 38°C; for higher temp. refer to ASME B16.5 flange ratings for conventional valves
(2) Tolerances for A and B : ± 1.6 mm (±1⁄16 in)
(3) Valves with lifting lever : add 10%
32
Weir First choice for power and industrial protection
TI-7-0213
PRESSURE RELIEF VALVES
Sarasin-RSBD
Extrapolation from ASME B16.34:2004 & API Std 526:2009
Orifice L
P/T Selection Chart
105.00
1500#
WCC
1500#
WC6
900# CF8M
100.00
95.00
900# & 1500# LCC
90.00
85.00
80.00
900#
WCC
75.00
900#
WC6
70.00
600# CF8M
65.00
600# LCC
600#
WCC
55.00
50.00
45.00
900#
CF8M
300# CF8M
Set Pressure (Barg)
60.00
600#
WC6
300# LCC
40.00
35.00
300#
WCC
30.00
300# & 600#
CF8M
25.00
20.00
15.00
150#
CF8M
10.00
150# LCC
300# Light
WCC
300#
WC6
150#
WCC
5.00
0.00
-200
-150
-100
-50
0
50
100
150
200
250
300
350
400
450
500
550
Discharge Temperature (˚C)
CF8M (below -46˚C)
TI-7-0213
LCC
WCC (-29 to +427˚C)
WC6
Weir First choice for power and industrial protection
33
PRESSURE RELIEF VALVES
Sarasin-RSBD
ORIFICE : M
23.2 cm2
3.60 in2
INLETx
ORIFICEx
OUTLET
P Series (Starflow) Selection Tables
According to API Std 526 : (edition 2009)
ANSI
FLANGE
RATING
Inlet
Outlet
Model Conven- Bellows
Number tional
Steam
service
MAX. SET PRESSURE
barg (psig)
-29°C
to +38°C
<232°C
(-20°F
(<450°F)
to 100°F)
-268°C
-46°C
to -47°C to -29°C
(-450°F
(-50°F
to -51°F) to -21°F)
MAX. BACK
PRESSURE (1)
barg (psig)
<538°C Conven- Bellows
(<1000°F) tional
<427°C
(<800°F)
MATERIALS
Body
Spring
4M6
150
150
P46M1
330
430
530
19.8 (285)
13 (185)
5.5 (80)
19.8 (285) 5.5 (80)
4M6
300
150
P46M7
330
430
530
19.8 (285)
19.8 (285)
19.8 (285)
19.8 (285) 5.5 (80)
4M6
300
150
P46M2
330
430
530
51 (740)
42.4 (615)
28 (410)
19.8 (285) 11 (160)
4M6
600
150
P46M3
330
430
530
76 (1100)
76 (1100)
57 (825)
19.8 (285) 11 (160)
4M6
900
150
P46M4
330
430
530
76 (1100)
76 (1100)
4M6
300
150
P46M2
332
432
502
35 (510)
16 (225)
4M6
600
150
P46M3
332
432
502
70 (1015)
4M6
900
150
P46M4
332
432
502
76 (1100)
4M6
150
150
P46M1
319
419
19.8 (285)
4M6
300
150
P46M7
319
419
19.8 (285)
19.8 (285) 5.5 (80)
SA 352
Alloy
4M6
300
150
P46M2
319
419
51 (740)
19.8 (285) 11 (160)
Gr. LCC
Steel
4M6
600
150
P46M3
319
419
76 (1100)
19.8 (285) 11 (160)
SA 216
Alloy
Gr. WCC
Steel
19.8 (285) 11 (160)
SA 216
High Temp.
31 (445)
19.8 (285) 11 (160)
Gr. WC6
Alloy
46 (670)
19.8 (285) 11 (160)
19.8 (285) 11 (160)
Steel
19.8 (285) 5.5 (80)
4M6
150
150
P46M1
316
416
19 (275)
19 (275)
4M6
300
150
P46M7
316
416
19 (275)
19 (275)
5.5 (80)
5.5 (80)
SA 351
Stainless
4M6
300
150
P46M2
316
416
36 (525)
19 (275)
11 (160)
Gr. CF8M
Steel
4M6
600
150
P46M3
316
416
41 (600)
19 (275)
11 (160)
D
C
⁄2" NPT
1
A
N E
B
INLETx
ORIFICEx
OUTLET
ANSI FLANGE
RATING
Inlet
Outlet
MODEL
A(2)
B(2)
C
D
E
N
NUMBER
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
Approximate
weight (3)
kg (lbs)
4M6
150
150
P46M1
177.8 (7)
184.1 (7-1⁄4)
725 (29)
25.4 (1)
40 (1-9⁄16)
14 (9⁄16)
85 (187)
4M6
300
150
P46M7
177.8 (7)
184.1 (7-1⁄4)
725 (29)
25.4 (1)
48 (1-7⁄8)
14 (9⁄16)
88 (194)
4M6
300
150
P46M2
177.8 (7)
184.1 (7-1⁄4)
785 (31)
25.4 (1)
48 (1-7⁄8)
14 (9⁄16)
95 (210)
4M6
600
150
P46M3
177.8 (7)
203.2 (8)
845 (34)
25.4 (1)
54 (2-1⁄8)
14 (9⁄16)
115 (254)
4M6
900
150
P46M4
196.8 (7-3⁄4)
222.2 (8-3⁄4)
950 (38)
25.4 (1)
68 (2-11⁄16)
14 (9⁄16)
165 (364)
(1) Max. back pressure limits at 38°C; for higher temp. refer to ASME B16.5 flange ratings for conventional valves
(2) Tolerances for A and B : ± 1.6 mm (±1⁄16 in)
(3) Valves with lifting lever : add 10%
34
Weir First choice for power and industrial protection
TI-7-0213
PRESSURE RELIEF VALVES
Sarasin-RSBD
Extrapolation from ASME B16.34:2004 & API Std 526:2009
Orifice M
P/T Selection Chart
78.00
76.00
74.00
900#
WCC
900#
WC6
600# CF8M
72.00
70.00
68.00
66.00
600# & 900# LCC
64.00
62.00
60.00
58.00
600#
WCC
56.00
54.00
52.00
50.00
48.00
44.00
600#
WC6
42.00
40.00
600#
CF8M
38.00
300# LCC
Set Pressure (Barg)
46.00
36.00
34.00
32.00
300#
WCC
30.00
300#
CF8M
28.00
26.00
24.00
22.00
20.00
18.00
16.00
300# Light
WCC
14.00
300#
WC6
150#
CF8M
8.00
150# LCC
12.00
10.00
150#
WCC
6.00
4.00
2.00
0.00
-200
-150
-100
-50
0
50
100
150
200
250
300
350
400
450
500
550
Discharge Temperature (˚C)
CF8M (below -46˚C)
TI-7-0213
LCC
WCC (-29 to +427˚C)
WC6
Weir First choice for power and industrial protection
35
PRESSURE RELIEF VALVES
Sarasin-RSBD
ORIFICE : N
28 cm2
4.34 in2
INLETx
ORIFICEx
OUTLET
P Series (Starflow) Selection Tables
According to API Std 526 : (edition 2009)
ANSI
FLANGE
RATING
Inlet
Outlet
Model Conven- Bellows
Number tional
Steam
service
MAX. SET PRESSURE
barg (psig)
-29°C
to +38°C
<232°C
(-20°F
(<450°F)
to 100°F)
-268°C
-46°C
to -47°C to -29°C
(-450°F
(-50°F
to -51°F) to -21°F)
<427°C
(<800°F)
MAX. BACK
PRESSURE (1)
barg (psig)
<538°C Conven- Bellows
(<1000°F) tional
MATERIALS
Body
Spring
4N6
150
150
P46N1
330
430
530
19.8 (285)
13 (185)
5.5 (80)
19.8 (285) 5.5 (80)
4N6
300
150
P46N7
330
430
530
19.8 (285)
19.8 (285)
19.8 (285)
19.8 (285) 5.5 (80)
4N6
300
150
P46N2
330
430
530
51 (740)
42.4 (615)
28 (410)
19.8 (285) 11 (160)
4N6
600
150
P46N3
330
430
530
69 (1000)
69 (1000)
57 (825)
19.8 (285) 11 (160)
4N6
900
150
P46N4
330
430
530
69 (1000)
69 (1000)
4N6
300
150
P46N2
332
432
502
35 (510)
16 (225)
4N6
600
150
P46N3
332
432
502
69 (1000)
31 (445)
4N6
900
150
P46N4
332
432
502
69 (1000)
46 (670)
19.8 (285) 11 (160)
4N6
150
150
P46N1
319
419
19.8 (285)
19.8 (285) 5.5 (80)
4N6
300
150
P46N7
319
419
19.8 (285)
19.8 (285) 5.5 (80)
SA 352
Alloy
4N6
300
150
P46N2
319
419
51 (740)
19.8 (285) 11 (160)
Gr. LCC
Steel
4N6
600
150
P46N3
319
419
69 (1000)
19.8 (285) 11 (160)
SA 216
Alloy
Gr. WCC
Steel
19.8 (285) 11 (160)
SA 216
High Temp.
19.8 (285) 11 (160)
Gr. WC6
Alloy
19.8 (285) 11 (160)
Steel
4N6
150
150
P46N1
316
416
19 (275)
19 (275)
4N6
300
150
P46N7
316
416
19 (275)
19 (275)
5.5 (80)
5.5 (80)
SA 351
Stainless
4N6
300
150
P46N2
316
416
31 (450)
19 (275)
11 (160)
Gr. CF8M
Steel
4N6
600
150
P46N3
316
416
34 (500)
19 (275)
11 (160)
D
C
⁄2" NPT
1
A
N E
B
INLETx
ORIFICEx
OUTLET
ANSI FLANGE
RATING
Inlet
Outlet
MODEL
A(2)
B(2)
C
D
E
N
NUMBER
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
Approximate
weight (3)
kg (lbs)
4N6
150
150
P46N1
196.8 (7-3⁄4)
209.5 (8-1⁄4)
750 (30)
25.4 (1)
40 (1-9⁄16)
14 (9⁄16)
95 (210)
4N6
300
150
P46N7
196.8 (7-3⁄4)
209.5 (8-1⁄4)
750 (30)
25.4 (1)
48 (1-7⁄8)
14 (9⁄16)
100 (220)
4N6
300
150
P46N2
196.8 (7-3⁄4)
209.5 (8-1⁄4)
810 (32)
25.4 (1)
48 (1-7⁄8)
14 (9⁄16)
105 (232)
4N6
600
150
P46N3
196.8 (7-3⁄4)
222.2 (8-3⁄4)
870 (34)
25.4 (1)
54 (2-1⁄8)
14 (9⁄16)
125 (276)
4N6
900
150
P46N4
196.8 (7-3⁄4)
222.2 (8-3⁄4)
990 (39)
25.4 (1)
59 (2-5⁄16)
14 (9⁄16)
210 (460)
(1) Max. back pressure limits at 38°C; for higher temp. refer to ASME B16.5 flange ratings for conventional valves
(2) Tolerances for A and B : ± 1.6 mm (±1⁄16 in)
(3) Valves with lifting lever : add 10%
36
Weir First choice for power and industrial protection
TI-7-0213
PRESSURE RELIEF VALVES
Sarasin-RSBD
Extrapolation from ASME B16.34:2004 & API Std 526:2009
Orifice N
P/T Selection Chart
70.00
68.00
900#
WCC
900#
WC6
600# CF8M
66.00
64.00
62.00
60.00
600#
WCC
600# & 900# LCC
58.00
56.00
54.00
52.00
50.00
48.00
600#
WC6
46.00
44.00
42.00
38.00
300# LCC
Set Pressure (Barg)
40.00
36.00
34.00
600#
CF8M
32.00
300#
WCC
30.00
28.00
26.00
300#
CF8M
24.00
22.00
20.00
18.00
16.00
300# Light
WCC
14.00
300#
WC6
150#
CF8M
10.00
150# LCC
12.00
150#
WCC
8.00
6.00
4.00
2.00
0.00
-200
-150
-100
-50
0
50
100
150
200
250
300
350
400
450
500
550
Discharge Temperature (˚C)
CF8M (below -46˚C)
TI-7-0213
LCC
WCC (-29 to +427˚C)
WC6
Weir First choice for power and industrial protection
37
PRESSURE RELIEF VALVES
Sarasin-RSBD
ORIFICE : P
41.2 cm2
6.38 in2
INLETx
ORIFICEx
OUTLET
P Series (Starflow) Selection Tables
According to API Std 526 : (edition 2009)
ANSI
FLANGE
RATING
Inlet
Outlet
Model Conven- Bellows
Number tional
Steam
service
MAX. SET PRESSURE
barg (psig)
-29°C
to +38°C
<232°C
(-20°F
(<450°F)
to 100°F)
-268°C
-46°C
to -47°C to -29°C
(-450°F
(-50°F
to -51°F) to -21°F)
<427°C
(<800°F)
MAX. BACK
PRESSURE (1)
barg (psig)
<538°C Conven- Bellows
(<1000°F) tional
MATERIALS
Body
Spring
4P6
150
150
P46P1
330
430
530
19.8 (285)
13 (185)
5.5 (80)
19.8 (285) 5.5 (80)
4P6
300
150
P46P7
330
430
530
19.8 (285)
19.8 (285)
19.8 (285)
19.8 (285) 5.5 (80)
4P6
300
150
P46P2
330
430
530
36.2 (525)
36.2 (525)
28 (410)
19.8 (285) 10 (150)
4P6
600
150
P46P3
330
430
530
69 (1000)
69 (1000)
57 (825)
19.8 (285) 10 (150)
4P6
900
150
P46P4
330
430
530
69 (1000)
69 (1000)
4P6
300
150
P46P2
332
432
502
35 (510)
16 (225)
4P6
600
150
P46P3
332
432
502
69 (1000)
31 (445)
4P6
900
150
P46P4
332
432
502
69 (1000)
46 (670)
19.8 (285) 10 (150)
4P6
150
150
P46P1
319
419
19.8 (285)
4P6
300
150
P46P7
319
419
19.8 (285)
19.8 (285) 5.5 (80)
SA 352
Alloy
4P6
300
150
P46P2
319
419
36 (525)
19.8 (285) 10 (150)
Gr. LCC
Steel
4P6
600
150
P46P3
319
419
69 (1000)
19.8 (285) 10 (150)
SA 216
Alloy
Gr. WCC
Steel
19.8 (285) 10 (150)
SA 216
High Temp.
19.8 (285) 10 (150)
Gr. WC6
Alloy
19.8 (285) 10 (150)
Steel
19.8 (285) 5.5 (80)
4P6
150
150
P46P1
316
416
12 (175)
12 (175)
4P6
300
150
P46P7
316
416
12 (175)
12 (175)
5.5 (80)
5.5 (80)
SA 351
Stainless
4P6
300
150
P46P2
316
416
21 (300)
19 (275)
10 (150)
Gr. CF8M
Steel
4P6
600
150
P46P3
316
416
33 (486)
19 (275)
10 (150)
D
C
⁄2" NPT
1
A
N E
B
INLETx
ORIFICEx
OUTLET
ANSI FLANGE
RATING
Inlet
Outlet
MODEL
A(2)
B(2)
C
D
E
N
NUMBER
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
Approximate
weight (3)
kg (lbs)
4P6
150
150
P46P1
181 (7-1⁄8)
228.6 (9)
795 (32)
25.4 (1)
40 (1-9⁄16)
14 (9⁄16)
4P6
300
150
P46P7
181 (7-1⁄8)
228.6 (9)
795 (32)
25.4 (1)
46 (1-13⁄16)
14 (9⁄16)
105 (232)
110 (242)
4P6
300
150
P46P2
225.4 (8-7⁄8)
254 (10)
850 (34)
25.4 (1)
48 (1-7⁄8)
14 (9⁄16)
125 (276)
4P6
600
150
P46P3
225.4 (8-7⁄8)
254 (10)
875 (35)
25.4 (1)
54 (2-1⁄8)
14 (9⁄16)
145 (320)
4P6
900
150
P46P4
225.4 (8-7⁄8)
254 (10)
1180 (47)
25.4 (1)
59 (2-5⁄16)
14 (9⁄16)
250 (550)
(1) Max. back pressure limits at 38°C; for higher temp. refer to ASME B16.5 flange ratings for conventional valves
(2) Tolerances for A and B : ± 1.6 mm (±1⁄16 in)
(3) Valves with lifting lever : add 10%
38
Weir First choice for power and industrial protection
TI-7-0213
PRESSURE RELIEF VALVES
Sarasin-RSBD
Extrapolation from ASME B16.34:2004 & API Std 526:2009
Orifice P
P/T Selection Chart
70.00
68.00
900#
WCC
900#
WC6
600# CF8M
66.00
64.00
62.00
60.00
58.00
600# & 900# LCC
56.00
54.00
52.00
50.00
600#
WCC
48.00
46.00
600#
WC6
44.00
42.00
38.00
36.00
34.00
32.00
30.00
28.00
600#
CF8M
26.00
300# LCC
Set Pressure (Barg)
40.00
300#
WCC
24.00
22.00
20.00
18.00
300#
CF8M
16.00
300# Light
WCC
300#
WC6
14.00
12.00
8.00
150#
CF8M
6.00
150# LCC
10.00
150#
WCC
4.00
2.00
0.00
-200
-150
-100
-50
0
50
100
150
200
250
300
350
400
450
500
550
Discharge Temperature (˚C)
CF8M (below -46˚C)
TI-7-0213
LCC
WCC (-29 to +427˚C)
WC6
Weir First choice for power and industrial protection
39
PRESSURE RELIEF VALVES
Sarasin-RSBD
ORIFICE : Q
71.2 cm2
11.05 in2
INLETx
ORIFICEx
OUTLET
P Series (Starflow) Selection Tables
According to API Std 526 : (edition 2009)
ANSI
FLANGE
RATING
Inlet
Outlet
Model Conven- Bellows
Number tional
Steam
service
MAX. SET PRESSURE
barg (psig)
-29°C
to +38°C
<232°C
(-20°F
(<450°F)
to 100°F)
-268°C
-46°C
to -47°C to -29°C
(-450°F
(-50°F
to -51°F) to -21°F)
MAX. BACK
PRESSURE (1)
barg (psig)
<538°C Conven- Bellows
(<1000°F) tional
<427°C
(<800°F)
MATERIALS
Body
Spring
6Q8
150
150
P68Q1
330
430
530
11 (165)
11 (165)
5.5 (80)
8 (115)
6Q8
300
150
P68Q7
330
430
530
11 (165)
11 (165)
11 (165)
8 (115)
5 (70)
SA 216
Alloy
6Q8
300
150
P68Q2
330
430
530
21 (300)
21 (300)
21 (300)
8 (115)
8 (115)
Gr. WCC
Steel
6Q8
600
150
P68Q3
330
430
530
41 (600)
41 (600)
41 (600)
8 (115)
8 (115)
6Q8
300
150
P68Q2
332
432
502
11 (165)
11 (165)
8 (115)
8 (115)
SA 216
High Temp.
6Q8
600
150
P68Q3
332
432
502
41 (600)
31 (445)
8 (115)
8 (115)
Gr. WC6
Alloy Steel
6Q8
150
150
P68Q1
319
419
8 (115)
5 (70)
11 (165)
5 (70)
6Q8
300
150
P68Q7
319
419
11 (165)
8 (115)
5 (70)
SA 352
Alloy
6Q8
300
150
P68Q2
319
419
21 (300)
8 (115)
8 (115)
Gr. LCC
Steel
6Q8
600
150
P68Q3
319
419
41 (600)
8 (115)
8 (115)
5 (70)
6Q8
150
150
P68Q1
316
416
11 (165)
8 (115)
6Q8
300
150
P68Q7
316
416
11 (165)
8 (115)
5 (70)
SA 351
Stainless
6Q8
300
150
P68Q2
316
416
17 (250)
8 (115)
8 (115)
Gr. CF8M
Steel
6Q8
600
150
P68Q3
316
416
21 (300)
8 (115)
8 (115)
D
C
⁄2" NPT
1
A
N E
B
INLETx
ORIFICEx
OUTLET
ANSI FLANGE
RATING
Inlet
Outlet
MODEL
A(2)
B(2)
C
D
E
N
NUMBER
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
Approximate
weight (3)
kg (lbs)
6Q8
150
150
P68Q1
239.7 (9-7⁄16)
241.3 (9-1⁄2)
950 (38)
28.6 (1-1⁄8)
45 (1-3⁄4)
18 (11⁄16)
215 (474)
6Q8
300
150
P68Q7
239.7 (9-7⁄16)
241.3 (9-1⁄2)
950 (38)
28.6 (1-1⁄8)
57 (2-1⁄4)
18 (11⁄16)
230 (507)
6Q8
300
150
P68Q2
239.7 (9-7⁄16)
241.3 (9-1⁄2)
1070 (43)
28.6 (1-1⁄8)
57 (2-1⁄4)
18 (11⁄16)
255 (562)
6Q8
600
150
P68Q3
239.7 (9-7⁄16)
241.3 (9-1⁄2)
1140 (45)
28.6 (1-1⁄8)
68 (2-11⁄16)
18 (11⁄16)
305 (672)
(1) Max. back pressure limits at 38°C; for higher temp. refer to ASME B16.5 flange ratings for conventional valves
(2) Tolerances for A and B : ± 3.2 mm (±1⁄8 in)
(3) Valves with lifting lever : add 10%
40
Weir First choice for power and industrial protection
TI-7-0213
PRESSURE RELIEF VALVES
Sarasin-RSBD
Extrapolation from ASME B16.34:2004 & API Std 526:2009
Orifice Q
P/T Selection Chart
42.00
600# CF8M
40.00
38.00
36.00
34.00
600# LCC
32.00
30.00
600#
WCC
600#
WC6
300#
WCC
300#
WC6
28.00
26.00
22.00
20.00
600#
CF8M
18.00
300# LCC
Set Pressure (Barg)
24.00
16.00
300#
CF8M
14.00
12.00
10.00
300# Light
WCC
150#
WC6
6.00
150#
CF8M
150# LCC
8.00
150#
WCC
4.00
2.00
0.00
-200
-150
-100
-50
0
50
100
150
200
250
300
350
400
450
500
550
Discharge Temperature (˚C)
CF8M (below -46˚C)
TI-7-0213
LCC
WCC (-29 to +427˚C)
WC6
Weir First choice for power and industrial protection
41
PRESSURE RELIEF VALVES
Sarasin-RSBD
ORIFICE : R
103.2 cm2
16.00 in2
INLETx
ORIFICEx
OUTLET
P Series (Starflow) Selection Tables
According to API Std 526 : (edition 2009)
ANSI
FLANGE
RATING
Inlet
Outlet
Model Conven- Bellows
Number tional
Steam
service
MAX. SET PRESSURE
barg (psig)
-29°C
to +38°C
<232°C
(-20°F
(<450°F)
to 100°F)
-268°C
-46°C
to -47°C to -29°C
(-450°F
(-50°F
to -51°F) to -21°F)
MAX. BACK
PRESSURE (1)
barg (psig)
<538°C Conven- Bellows
(<1000°F) tional
<427°C
(<800°F)
MATERIALS
Body
Spring
6R8
150
150
P68R1
330
430
530
7 (100)
7 (100)
5.5 (80)
4 (60)
6R8
300
150
P68R7
330
430
530
7 (100)
7 (100)
7 (100)
4 (60)
4 (60)
4 (60)
SA 216
Alloy
6 R 10
300
150
P69R2
330
430
530
16 (230)
16 (230)
16 (230)
7 (100)
7 (100)
Gr. WCC
Steel
6 R 10
600
150
P69R3
330
430
530
21 (300)
21 (300)
21 (300)
7 (100)
7 (100)
6R8
300
150
P69R2
332
432
502
7 (100)
7 (100)
4 (60)
4 (60)
SA 216
High Temp.
6 R 10
600
150
P69R3
332
432
502
21 (300)
21 (300)
7 (100)
7 (100)
Gr. WC6
Alloy Steel
6R8
150
150
P68R1
319
419
4 (60)
4 (60)
7 (100)
6R8
300
150
P68R7
319
419
7 (100)
4 (60)
4 (60)
SA 352
Alloy
6 R 10
300
150
P69R2
319
419
16 (230)
7 (100)
7 (100)
Gr. LCC
Steel
6 R 10
600
150
P69R3
319
419
21 (300)
7 (100)
7 (100)
6R8
150
150
P68R1
316
416
3.8 (55)
3.8 (55)
3.8 (55)
6R8
300
150
P68R7
316
416
3.8 (55)
3.8 (55)
3.8 (55)
SA 351
Stainless
6 R 10
300
150
P69R2
316
416
10 (150)
7 (100)
7 (100)
Gr. CF8M
Steel
6 R 10
600
150
P69R3
316
416
14 (200)
7 (100)
7 (100)
D
C
⁄2" NPT
1
A
N E
B
INLETx
ORIFICEx
OUTLET
ANSI FLANGE
RATING
Inlet
Outlet
MODEL
A(2)
B(2)
C
D
E
N
NUMBER
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
Approximate
weight (3)
kg (lbs)
6R8
150
150
P68R1
239.7 (9-7⁄16)
241.3 (9-1⁄2)
950 (38)
28.6 (1-1⁄8)
45 (1-3⁄4)
18 (11⁄16)
215 (474)
6R8
300
150
P68R7
239.7 (9-7⁄16)
241.3 (9-1⁄2)
950 (38)
28.6 (1-1⁄8)
57 (2-1⁄4)
18 (11⁄16)
230 (507)
6 R 10
300
150
P69R2
239.7 (9-7⁄16)
266.7 (10-1⁄2)
1070 (43)
30.2 (1-3⁄16)
57 (2-1⁄4)
18 (11⁄16)
275 (606)
6 R 10
600
150
P69R3
239.7 (9-7⁄16)
266.7 (10-1⁄2)
1140 (45)
30.2 (1-3⁄16)
68 (2-11⁄16)
18 (11⁄16)
325 (716)
(1) Max. back pressure limits at 38°C; for higher temp. refer to ASME B16.5 flange ratings for conventional valves
(2) Tolerances for A and B : ± 3.2 mm (±1⁄8 in)
(3) Valves with lifting lever : add 10%
42
Weir First choice for power and industrial protection
TI-7-0213
PRESSURE RELIEF VALVES
Sarasin-RSBD
Extrapolation from ASME B16.34:2004 & API Std 526:2009
Orifice R
P/T Selection Chart
21.00
600# CF8M
20.00
19.00
18.00
17.00
600# LCC
16.00
15.00
600#
WCC
600#
WC6
300#
WCC
300#
WC6
14.00
13.00
11.00
10.00
600#
CF8M
9.00
300# LCC
Set Pressure (Barg)
12.00
8.00
300#
CF8M
7.00
6.00
5.00
300# Light
WCC
150#
WC6
150#
CF8M
3.00
150# LCC
4.00
150#
WCC
2.00
1.00
0.00
-200
-150
-100
-50
0
50
100
150
200
250
300
350
400
450
500
550
Discharge Temperature (˚C)
CF8M (below -46˚C)
TI-7-0213
LCC
WCC (-29 to +427˚C)
WC6
Weir First choice for power and industrial protection
43
PRESSURE RELIEF VALVES
Sarasin-RSBD
ORIFICE : T
168 cm2
26.00 in2
INLETx
ORIFICEx
OUTLET
P Series (Starflow) Selection Tables
According to API 526 : (edition 2009)
ANSI
FLANGE
RATING
Inlet
Outlet
Model Conven- Bellows
Number tional
Steam
service
MAX. SET PRESSURE
barg (psig)
-29°C
to +38°C
<232°C
(-20°F
(<450°F)
to 100°F)
-268°C
-46°C
to -47°C to -29°C
(-450°F
(-50°F
to -51°F) to -21°F)
MAX. BACK
PRESSURE (1)
barg (psig)
<538°C Conven- Bellows
(<1000°F) tional
<427°C
(<800°F)
MATERIALS
Body
Spring
8 T 10
150
150
P89T1
330
430
530
4.5 (65)
4.5 (65)
4.5 (65)
2 (30)
2 (30)
8 T 10
300
150
P89T7
330
430
530
4.5 (65)
4.5 (65)
4.5 (65)
2 (30)
2 (30)
SA 216
Alloy
8 T 10
300
150
P89T2
330
430
530
8 (120)
8 (120)
8 (120)
4 (60)
4 (60)
Gr. WCC
Steel
8 T 10
300
150
P89T3
330
430
530
21 (300)
21 (300)
21 (300)
7 (100)
7 (100)
8 T 10
300
150
P89T2
332
432
502
8 (120)
8 (120)
4 (60)
4 (60)
SA 216
High Temp.
8 T 10
300
150
P89T3
332
432
502
21 (300)
16 (225)
7 (100)
7 (100)
Gr. WC6
Alloy Steel
8 T 10
150
150
P89T1
319
419
4.5 (65)
2 (30)
2 (30)
8 T 10
300
150
P89T7
319
419
4.5 (65)
2 (30)
2 (30)
SA 352
Alloy
8 T 10
300
150
P89T2
319
419
8 (120)
4 (60)
4 (60)
Gr. LCC
Steel
8 T 10
300
150
P89T3
319
419
21 (300)
7 (100)
7 (100)
SA 351
Stainless
Gr. CF8M
Steel
8 T 10
150
150
P89T1
316
416
3.5 (50)
2 (30)
2 (30)
8 T 10
300
150
P89T7
316
416
3.5 (50)
2 (30)
2 (30)
8 T 10
300
150
P89T2
316
416
4.5 (65)
4 (60)
4 (60)
D
C
⁄2" NPT
1
A
N E
B
INLETx
ORIFICEx
OUTLET
ANSI FLANGE
RATING
Inlet
Outlet
MODEL
A(2)
B(2)
C
D
E
N
NUMBER
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
Approximate
weight (3)
kg (lbs)
8 T 10
150
150
P89T1
276.2 (10-7⁄8)
279.4 (11)
1020 (41)
30.2 (1-3⁄16)
49 (1-15⁄16)
18 (11⁄16)
290 (640)
8 T 10
300
150
P89T7
276.2 (10-7⁄8)
279.4 (11)
1020 (41)
30.2 (1-3⁄16)
61 (2-3⁄8)
18 (11⁄16)
310 (683)
8 T 10
300
150
P89T2
276.2 (10-7⁄8)
279.4 (11)
1200 (48)
30.2 (1-3⁄16)
61 (2-3⁄8)
18 (11⁄16)
340 (749)
8 T 10
300
150
P89T3
276.2 (10-7⁄8)
279.4 (11)
1200 (48)
30.2 (1-3⁄16)
61 (2-3⁄8)
18 (11⁄16)
350 (772)
(1) Max. back pressure limits at 38°C; for higher temp. refer to ASME B16.5 flange ratings for conventional valves
(2) Tolerances for A and B : ± 3.2 mm (±1⁄8 in)
(3) Valves with lifting lever : add 10%
44
Weir First choice for power and industrial protection
TI-7-0213
PRESSURE RELIEF VALVES
Sarasin-RSBD
Extrapolation from ASME B16.34:2004 & API Std 526:2009
Orifice T
P/T Selection Chart
21.00
20.00
19.00
18.00
17.00
16.00
15.00
14.00
300# LCC
13.00
Set Pressure (Barg)
12.00
11.00
10.00
9.00
8.00
300# CF8M
7.00
6.00
5.00
300#
CF8M
4.00
2.00
150#
CF8M
150# LCC
3.00
150# & 300# Light
WCC
150#
WC6
1.00
0.00
-200
-150
-100
-50
0
50
100
150
200
250
300
350
400
450
500
550
Discharge Temperature (˚C)
CF8M (below -46˚C)
TI-7-0213
LCC
WCC (-29 to +427˚C)
WC6
Weir First choice for power and industrial protection
45
PRESSURE RELIEF VALVES
ORIFICE : V
301.6 cm2 (actual)
46.75 in2 (actual)
INLETx
ORIFICEx
OUTLET
Sarasin-RSBD
ORIFICE : W
452.3 cm2 (actual)
70.10 in2 (actual)
ANSI
FLANGE
RATING
Inlet
Outlet
Model Conven- Bellows
Number tional
P Series (Starflow) Selection Tables
According to ASME B16.34
-268°C
-46°C
to -47°C to -29°C
(-450°F
(-50°F
to -51°F) to -21°F)
Steam
service
MAX. SET PRESSURE
barg (psig)
-29°C
to +38°C
<232°C
(-20°F
(<450°F)
to 100°F)
MAX. BACK
PRESSURE (1)
barg (psig)
<538°C Conven- Bellows
(<1000°F) tional
<427°C
(<800°F)
10 V 14
150
150
P9BV1
330
430
530
7.1 (103)
7.1 (103)
5.5 (80)
2 (30)
3 (45)
10 V 14
300
150
P9BV7
330
430
530
7.1 (103)
7.1 (103)
5.5 (80)
2 (30)
3 (45)
10 V 14
300
150
P9BV2
330
430
530
20 (290)
20 (290)
20 (290)
4 (60)
3 (45)
10 V 14
150
150
P9BV1
332
432
532
5.5 (80)
5.5 (80)
2 (30)
3 (45)
10 V 14
300
150
P9BV7
332
432
532
7.1 (103)
7.1 (103)
2 (30)
3 (45)
10 V 14
300
150
P9BV2
332
432
532
20 (290)
20 (290)
4 (60)
3 (45)
10 V 14
150
150
P9BV1
319
419
7.1 (103)
2 (30)
3 (45)
10 V 14
300
150
P9BV7
319
419
7.1 (103)
2 (30)
3 (45)
10 V 14
300
150
P9BV2
319
419
4 (60)
3 (45)
10 V 14
150
150
P9BV1
316
416
7.1 (103)
20 (290)
2 (30)
3 (45)
10 V 14
300
150
P9BV7
316
416
7.1 (103)
2 (30)
3 (45)
10 V 14
300
150
P9BV2
316
416
20 (290)
4 (60)
3 (45)
12 W 12
150
150
PAAW1
330
430
530
6.3 (91)
6.3 (91)
5.5 (80)
2 (30)
2 (30)
12 W 12
300
150
PAAW7
330
430
530
6.3 (91)
6.3 (91)
5.5 (80)
2 (30)
2 (30)
12 W 12
300
150
PAAW2
330
430
530
20 (290)
20 (290)
20 (290)
4 (60)
4 (60)
12 W 12
150
150
PAAW1
332
432
532
5.5 (80)
5.5 (80)
2 (30)
2 (30)
12 W 12
300
150
PAAW7
332
432
532
6.3 (91)
6.3 (91)
2 (30)
2 (30)
12 W 12
300
150
PAAW2
332
432
532
20 (290)
20 (290)
4 (60)
4 (60)
12 W 12
150
150
PAAW1
319
419
6.3 (91)
2 (30)
2 (30)
12 W 12
300
150
PAAW7
319
419
6.3 (91)
2 (30)
2 (30)
12 W 12
300
150
PAAW2
319
419
20 (290)
4 (60)
4 (60)
12 W 12
150
150
PAAW1
316
416
6.3 (91)
2 (30)
2 (30)
12 W 12
300
150
PAAW7
316
416
6.3 (91)
2 (30)
2 (30)
12 W 12
300
150
PAAW2
316
416
4 (60)
4 (60)
Orifice V
D
C
N
B
INLETx
ORIFICEx
OUTLET
ANSI FLANGE
RATING
Inlet
Outlet
E
B
Alloy
Steel
SA 216
High Temp.
Gr. WC6
Alloy Steel
SA 352
Alloy
Gr. LCC
Steel
SA 351
Stainless
Gr. CF8M
Steel
SA 216
Alloy
Gr. WCC
Steel
SA 216
High Temp.
Gr. WC6
Alloy Steel
SA 352
Alloy
Gr. LCC
Steel
SA 351
Stainless
Gr. CF8M
Steel
B
MODEL
A(2)
B(2)
C
D
E
N
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
Approximate
weight (3)
kg (lbs)
10 V 14
150
150
P9BV1
380 (14-15⁄16)
370 (14-9⁄16)
1370 (53-15⁄16)
35 (1-3⁄8)
59 (2-5⁄16)
28 (1-1⁄8)
10 V 14
300
150
P9BV7
380 (14- ⁄16)
370 (14- ⁄16)
1370 (53- ⁄16)
35 (1- ⁄8)
77.5 (3- ⁄16)
28 (1-1⁄8)
530 (1215)
10 V 14
300
150
P9BV2
380 (14-15⁄16)
370 (14-9⁄16)
1620 (63-3⁄4)
35 (1-3⁄8)
77.5 (3-1⁄16)
28 (1-1⁄8)
780 (1790)
12 W 12
150
150
PAAW1
328 (12-15⁄16)
430 (16-15⁄16)
1375 (54-1⁄8)
31.8 (1-1⁄4)
61 (2-3⁄8)
28 (1-1⁄8)
580 (1330)
12 W 12
300
150
PAAW7
328 (12- ⁄16)
430 (16- ⁄16)
1375 (54- ⁄8)
39 (1- ⁄16)
82 (3- ⁄4)
28 (1-1⁄8)
650 (1330)
12 W 12
300
150
PAAW2
328 (12-15⁄16)
430 (16-15⁄16)
1650 (64-15⁄16)
39 (1-9⁄16)
82 (3-1⁄4)
28 (1-1⁄8)
830 (1900)
15
SA 216
Gr. WCC
A
NUMBER
15
Spring
C
A
E
N
Body
Orifice W
D
A
MATERIALS
9
15
15
1
3
9
1
1
470 (1080)
(2) Tolerances for A and B : ± 3.2 mm (±1⁄8 in)
(3) Valves with lifting lever : add 5%
46
Weir First choice for power and industrial protection
TI-7-0213
PRESSURE RELIEF VALVES
Sarasin-RSBD
Extrapolation from ASME B16.34:2004
Orifice V
P/T Selection Chart
21.00
20.00
19.00
300#
CF8M
18.00
17.00
16.00
Set Pressure (Barg)
300#
CF8M
13.00
300# LCC
15.00
14.00
300#
WC6
300#
WCC
12.00
11.00
10.00
9.00
8.00
7.00
300# Light
WCC
6.00
300# Light
WC6
4.00
150#
CF8M
3.00
150# LCC
5.00
150#
WCC
150#
WC6
2.00
1.00
0.00
-200
-150
-100
-50
0
50
100
150
200
250
300
350
400
450
500
550
Discharge Temperature (˚C)
Orifice W
P/T Selection Chart
21.00
20.00
19.00
300#
CF8M
18.00
17.00
16.00
Set Pressure (Barg)
300#
CF8M
13.00
300# LCC
15.00
14.00
300#
WC6
300#
WCC
12.00
11.00
10.00
9.00
8.00
7.00
300# Light
WCC
6.00
4.00
150#
CF8M
3.00
150# LCC
5.00
300# Light
WC6
150#
WCC
150#
WC6
2.00
1.00
0.00
-200
-150
-100
-50
0
50
100
150
200
250
300
350
400
450
500
550
Discharge Temperature (˚C)
CF8M (below -46˚C)
TI-7-0213
LCC
WCC (-29 to +427˚C)
WC6
Weir First choice for power and industrial protection
47
PRESSURE RELIEF VALVES
Sarasin-RSBD
P Series (Starflow)Capacity Tables
Sizing a valve using capacity tables
For air, steam or water it can be quicker to size the
valves using the capacity tables rather than the
sizing formulas.
Example of sizing
Required flow :
5 800 Nm3/h of air
Set pressure :
42 bar
Overpressure :
10%
Using the air capacity table, with a set pressure of
42 bar, we find an orifice F (1.98 cm2), with a
capacity of 6 193 Nm3/h.
This capacity includes the safety margin of 0.9. (as
per ASME and ISO requirements).
48
Weir First choice for power and industrial protection
TI-7-0213
PRESSURE RELIEF VALVES
Sarasin-RSBD
P Series (Starflow) Capacity Tables
Air
Capacities in Nm3/hr at 0˚C at 10% overpressure
Calculation according to API STD 520
Orifices
cm2
D
E
F
G
H
J
K
L
M
N
P
Q
R
T
0.71
1.26
1.98
3.24
5.06
8.30
11.86
18.41
23.22
28
41.2
71.2
103.2
168
99
125
151
177
203
229
255
280
306
332
358
384
410
462
487
513
539
565
617
669
720
772
824
875
979
1082
1186
1289
1393
1496
1600
1703
1807
1910
2014
2117
2221
2324
2428
2531
2635
2738
2842
2945
3049
3152
3411
3669
3928
4187
4446
4704
4963
5222
5739
6257
6774
7291
7809
8326
8844
9361
9878
10396
11431
12465
13500
14535
15570
16605
17639
18674
19709
20744
21779
176
222
268
314
360
406
452
498
544
590
635
681
727
819
865
911
957
1003
1095
1186
1278
1370
1462
1554
1737
1921
2105
2288
2472
2656
2839
3023
3206
3390
3574
3757
3941
4125
4308
4492
4676
4859
5043
5227
5410
5594
6053
6512
6971
7430
7889
8348
8808
9267
10185
11103
12021
12940
13858
14776
15694
16612
17531
18449
20285
22122
23958
25794
27631
29467
31304
33140
34977
36813
38649
277
349
421
494
566
638
710
782
854
926
999
1071
1143
1287
1359
1431
1504
1576
1720
1864
2009
2153
2297
2442
2730
3019
3307
3596
3884
4173
4462
4750
5039
5327
5616
5904
6193
6482
6770
7059
7347
7636
7925
8213
8502
8790
9512
10233
10955
11676
12398
13119
13840
14562
16005
17448
18891
20334
21776
23219
24662
26105
27548
28991
31877
34763
37648
40534
43420
46306
49192
52077
454
572
690
808
926
1044
1162
1280
1398
1516
1634
1752
1870
2106
2224
2342
2460
2579
2815
3051
3287
3523
3759
3995
4467
4940
5412
5884
6356
6829
7301
7773
8245
8717
9190
9662
10134
10606
11079
11551
12023
12495
12967
13440
13912
14384
15565
16745
17926
19106
20287
21467
22648
23829
26190
28551
30912
33273
35634
37995
40356
42717
45079
47440
52162
56884
61606
708
893
1077
1261
1446
1630
1815
1999
2183
2368
2552
2736
2921
3290
3474
3658
3843
4027
4396
4764
5133
5502
5871
6239
6977
7714
8452
9189
9927
10664
11402
12139
12877
13614
14352
15089
15827
16564
17302
18039
18777
19514
20252
20989
21727
22464
24308
26152
27995
29839
31683
33526
35370
37214
40901
44589
48276
51963
55651
59338
63026
66713
70401
1162
1464
1767
2069
2372
2674
2976
3279
3581
3884
4186
4489
4791
5396
5698
6001
6303
6606
7210
7815
8420
9025
9630
10235
11444
12654
13864
15073
16283
17493
18703
19912
21122
22332
23541
24751
25961
27171
28380
29590
30800
32009
33219
34429
35639
36848
39872
42897
45921
48945
51970
54994
58018
61042
67091
73139
79188
85236
91285
97334
103382
109431
115479
1660
2092
2524
2957
3389
3821
4253
4685
5117
5549
5982
6414
6846
7710
8142
8574
9007
9439
10303
11167
12032
12896
13760
14624
16353
18082
19810
21539
23267
24996
26724
28453
30182
31910
33639
35367
37096
38824
40553
42282
44010
45739
47467
49196
50924
52653
56974
61296
65617
69939
74260
78582
82903
87224
95867
104510
113153
121796
130439
2577
3248
3919
4590
5260
5931
6602
7273
7944
8614
9285
9956
10627
11968
12639
13310
13981
14652
15993
17335
18676
20018
21360
22701
25384
28068
30751
33434
36117
38801
41484
44167
46850
49533
52217
54900
57583
60266
62949
65633
68316
70999
73682
76366
79049
81732
88440
95148
101856
108564
115272
121980
128688
135396
3250
4096
4943
5789
6635
7481
8327
9173
10019
10865
11711
12557
13403
15095
15941
16787
17634
18480
20172
21864
23556
25248
26940
28632
32017
35401
38785
42169
45554
48938
52322
55707
59091
62475
65859
69244
72628
76012
79396
82781
86165
89549
92933
96318
99702
103086
111547
120008
128468
136929
3920
4940
5960
6980
8000
9021
10041
11061
12081
13102
14122
15142
16162
18203
19223
20243
21264
22284
24324
26365
28405
30446
32486
34527
38608
42688
46769
50850
54931
59012
63093
67174
71255
75336
79417
83498
87579
91660
95741
99822
103903
107983
112064
116145
120226
124307
134510
144712
5767
7269
8770
10271
11772
13273
14775
16276
17777
19278
20779
22281
23782
26784
28285
29787
31288
32789
35791
38794
41796
44799
47801
50803
56808
62813
68818
74823
80827
86832
92837
98842
104847
110852
116856
122861
128866
134871
140876
146880
152885
158890
164895
170900
176904
182909
197921
212933
9967
12561
15155
17750
20344
22938
25533
28127
30721
33316
35910
38504
41099
46287
48882
51476
54070
56664
61853
67042
72230
77419
82608
87796
98173
108551
118928
129305
139682
150060
160437
170814
181191
191569
201946
212323
14446
18207
21967
25727
29488
33248
37008
40768
44529
48289
52049
55810
59570
67090
70851
74611
78371
82132
89652
97173
104693
112214
119735
127255
142296
157338
23517
29639
35760
41882
48003
54124
60246
66367
72489
78610
84731
90853
96974
109217
115338
121460
127581
133703
145945
158188
170431
182674
194917
207160
231645
256131
Set pressure - barg
1
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
6.5
7
8
8.5
9
9.5
10
11
12
13
14
15
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
52
54
56
58
60
65
70
75
80
85
90
95
100
110
120
130
140
150
160
170
180
190
200
220
240
260
280
300
320
340
360
380
400
420
TI-7-0213
Weir First choice for power and industrial protection
49
PRESSURE RELIEF VALVES
Sarasin-RSBD
P Series (Starflow) Capacity Tables
Saturated Steam
Orifices
cm2
Calculation according to API STD 520
Capacities T/hr at 10% overpressure
D
E
F
G
H
J
K
L
M
N
P
Q
R
T
0.71
1.26
1.98
3.24
5.06
8.30
11.86
18.41
23.22
28
41.2
71.2
103.2
168
0.08
0.10
0.12
0.14
0.16
0.18
0.20
0.22
0.24
0.26
0.28
0.30
0.32
0.36
0.38
0.40
0.42
0.44
0.48
0.52
0.56
0.60
0.64
0.68
0.75
0.83
0.91
0.99
1.07
1.15
1.23
1.31
1.39
1.47
1.55
1.63
1.71
1.79
1.87
1.95
2.03
2.11
2.19
2.27
2.35
2.43
2.63
2.83
3.03
3.23
3.43
3.63
3.83
4.03
4.43
4.82
5.22
5.62
6.02
6.42
6.82
7.22
7.62
8.02
0.14
0.17
0.21
0.24
0.28
0.31
0.35
0.38
0.42
0.45
0.49
0.53
0.56
0.63
0.67
0.70
0.74
0.77
0.84
0.91
0.99
1.06
1.13
1.20
1.34
1.48
1.62
1.76
1.91
2.05
2.19
2.33
2.47
2.61
2.76
2.90
3.04
3.18
3.32
3.46
3.61
3.75
3.89
4.03
4.17
4.31
4.67
5.02
5.38
5.73
6.08
6.44
6.79
7.15
7.85
8.56
9.27
9.98
10.69
11.39
12.10
12.81
13.52
14.23
0.21
0.27
0.32
0.38
0.44
0.49
0.55
0.60
0.66
0.71
0.77
0.83
0.88
0.99
1.05
1.10
1.16
1.22
1.33
1.44
1.55
1.66
1.77
1.88
2.11
2.33
2.55
2.77
3.00
3.22
3.44
3.66
3.89
4.11
4.33
4.55
4.78
5.00
5.22
5.44
5.67
5.89
6.11
6.33
6.56
6.78
7.33
7.89
8.45
9.00
9.56
10.12
10.67
11.23
12.34
13.45
14.57
15.68
16.79
17.90
19.02
20.13
21.24
22.35
0.35
0.44
0.53
0.62
0.71
0.80
0.90
0.99
1.08
1.17
1.26
1.35
1.44
1.62
1.72
1.81
1.90
1.99
2.17
2.35
2.53
2.72
2.90
3.08
3.44
3.81
4.17
4.54
4.90
5.27
5.63
5.99
6.36
6.72
7.09
7.45
7.81
8.18
8.54
8.91
9.27
9.63
10.00
10.36
10.73
11.09
12.00
12.91
13.82
14.73
15.64
16.55
17.46
18.37
20.19
22.01
23.84
25.66
27.48
29.30
31.12
32.94
34.76
36.58
0.55
0.69
0.83
0.97
1.11
1.26
1.40
1.54
1.68
1.83
1.97
2.11
2.25
2.54
2.68
2.82
2.96
3.11
3.39
3.67
3.96
4.24
4.53
4.81
5.38
5.95
6.52
7.09
7.65
8.22
8.79
9.36
9.93
10.50
11.07
11.63
12.20
12.77
13.34
13.91
14.48
15.05
15.62
16.18
16.75
17.32
18.74
20.16
21.59
23.01
24.43
25.85
27.27
28.69
31.54
34.38
37.22
40.07
42.91
45.75
48.60
51.44
54.28
0.90
1.13
1.36
1.60
1.83
2.06
2.30
2.53
2.76
2.99
3.23
3.46
3.69
4.16
4.39
4.63
4.86
5.09
5.56
6.03
6.49
6.96
7.43
7.89
8.82
9.76
10.69
11.62
12.56
13.49
14.42
15.35
16.29
17.22
18.15
19.09
20.02
20.95
21.88
22.82
23.75
24.68
25.61
26.55
27.48
28.41
30.74
33.08
35.41
37.74
40.07
42.40
44.74
47.07
51.73
56.40
61.06
65.72
70.39
75.05
79.72
84.38
89.04
1.28
1.61
1.95
2.28
2.61
2.95
3.28
3.61
3.95
4.28
4.61
4.95
5.28
5.95
6.28
6.61
6.94
7.28
7.94
8.61
9.28
9.94
10.61
11.28
12.61
13.94
15.28
16.61
17.94
19.27
20.61
21.94
23.27
24.61
25.94
27.27
28.60
29.94
31.27
32.60
33.94
35.27
36.60
37.93
39.27
40.60
43.93
47.26
50.60
53.93
57.26
60.59
63.92
67.26
73.92
80.59
87.25
93.91
100.58
1.99
2.50
3.02
3.54
4.06
4.57
5.09
5.61
6.13
6.64
7.16
7.68
8.19
9.23
9.75
10.26
10.78
11.30
12.33
13.37
14.40
15.44
16.47
17.50
19.57
21.64
23.71
25.78
27.85
29.92
31.99
34.06
36.13
38.19
40.26
42.33
44.40
46.47
48.54
50.61
52.68
54.75
56.81
58.88
60.95
63.02
68.19
73.37
78.54
83.71
88.88
94.06
99.23
104.40
2.51
3.16
3.81
4.46
5.12
5.77
6.42
7.07
7.73
8.38
9.03
9.68
10.33
11.64
12.29
12.94
13.60
14.25
15.55
16.86
18.16
19.47
20.77
22.08
24.69
27.30
29.91
32.52
35.13
37.73
40.34
42.95
45.56
48.17
50.78
53.39
56.00
58.61
61.22
63.83
66.44
69.05
71.66
74.27
76.88
79.49
86.01
92.53
99.06
105.58
3.02
3.81
4.60
5.38
6.17
6.96
7.74
8.53
9.32
10.10
10.89
11.68
12.46
14.04
14.82
15.61
16.40
17.18
18.76
20.33
21.90
23.48
25.05
26.62
29.77
32.92
36.06
39.21
42.36
45.50
48.65
51.80
54.94
58.09
61.24
64.38
67.53
70.68
73.82
76.97
80.12
83.26
86.41
89.56
92.70
95.85
103.72
111.58
4.45
5.60
6.76
7.92
9.08
10.23
11.39
12.55
13.71
14.86
16.02
17.18
18.34
20.65
21.81
22.97
24.13
25.28
27.60
29.91
32.23
34.54
36.86
39.17
43.80
48.43
53.06
57.69
62.32
66.95
71.58
76.21
80.84
85.47
90.11
94.74
99.37
104.00
108.63
113.26
117.89
122.52
127.15
131.78
136.41
141.04
152.61
164.19
7.69
9.69
11.69
13.69
15.69
17.69
19.69
21.69
23.69
25.69
27.69
29.69
31.69
35.69
37.69
39.69
41.69
43.69
47.69
51.69
55.70
59.70
63.70
67.70
75.70
83.70
91.70
99.70
107.71
115.71
123.71
131.71
139.71
147.71
155.72
163.72
11.14
14.04
16.94
19.84
22.74
25.64
28.54
31.44
34.34
37.23
40.13
43.03
45.93
51.73
54.63
57.53
60.43
63.33
69.13
74.93
80.73
86.53
92.32
98.12
109.72
121.32
18.13
22.85
27.57
32.29
37.01
41.73
46.45
51.17
55.89
60.61
65.33
70.05
74.77
84.21
88.93
93.65
98.37
103.09
112.54
121.98
131.42
140.86
150.30
159.74
178.62
197.50
Set pressure - barg
1
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
6.5
7
8
8.5
9
9.5
10
11
12
13
14
15
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
52
54
56
58
60
65
70
75
80
85
90
95
100
110
120
130
140
150
160
170
180
190
200
50
Weir First choice for power and industrial protection
TI-7-0213
PRESSURE RELIEF VALVES
Sarasin-RSBD
P Series (Starflow) Capacity Tables
Capacities m3/hr at 10% overpressure
Calculation according to API STD 520
Water
Orifices
cm2
D
E
F
G
H
J
K
L
M
N
P
Q
R
T
0.71
1.26
1.98
3.24
5.06
8.30
11.86
18.41
23.22
28
41.2
71.2
103.2
168
2.66
3.26
3.77
4.21
4.61
4.98
5.33
5.65
5.96
6.25
6.52
6.79
7.05
7.53
7.76
7.99
8.21
8.42
8.83
9.23
9.60
9.97
10.31
10.65
11.30
11.91
12.49
13.05
13.58
14.09
14.59
15.07
15.53
15.98
16.42
16.84
17.26
17.67
18.06
18.45
18.83
19.21
19.57
19.93
20.28
20.63
21.47
22.28
23.06
23.82
24.55
25.27
25.96
26.63
27.93
29.17
30.37
31.51
32.62
33.69
34.72
35.73
36.71
37.66
39.50
41.26
42.94
44.57
46.13
47.64
49.11
50.53
51.92
53.27
54.58
4.73
5.79
6.68
7.47
8.19
8.84
9.45
10.03
10.57
11.08
11.58
12.05
12.50
13.37
13.78
14.18
14.57
14.95
15.68
16.37
17.04
17.68
18.31
18.91
20.05
21.14
22.17
23.15
24.10
25.01
25.89
26.74
27.56
28.36
29.14
29.89
30.63
31.35
32.06
32.75
33.42
34.08
34.73
35.37
36.00
36.61
38.11
39.54
40.93
42.27
43.58
44.84
46.07
47.26
49.57
51.77
53.89
55.92
57.89
59.78
61.62
63.41
65.15
66.84
70.10
73.22
76.21
79.09
81.86
84.55
87.15
89.68
92.13
94.53
96.86
7.4
9.1
10.5
11.7
12.9
13.9
14.9
15.8
16.6
17.4
18.2
18.9
19.7
21.0
21.7
22.3
22.9
23.5
24.6
25.7
26.8
27.8
28.8
29.7
31.5
33.2
34.8
36.4
37.9
39.3
40.7
42.0
43.3
44.6
45.8
47.0
48.1
49.3
50.4
51.5
52.5
53.6
54.6
55.6
56.6
57.5
59.9
62.1
64.3
66.4
68.5
70.5
72.4
74.3
77.9
81.4
84.7
87.9
91.0
93.9
96.8
99.6
102.4
105.0
110.2
115.1
119.8
124.3
128.6
132.9
137.0
140.9
12.2
14.9
17.2
19.2
21.1
22.7
24.3
25.8
27.2
28.5
29.8
31.0
32.2
34.4
35.4
36.5
37.5
38.4
40.3
42.1
43.8
45.5
47.1
48.6
51.6
54.4
57.0
59.5
62.0
64.3
66.6
68.8
70.9
72.9
74.9
76.9
78.8
80.6
82.4
84.2
85.9
87.6
89.3
90.9
92.6
94.1
98.0
101.7
105.3
108.7
112.1
115.3
118.5
121.5
127.5
133.1
138.6
143.8
148.9
153.7
158.5
163.1
167.5
171.9
180.3
188.3
196.0
19.0
23.2
26.8
30.0
32.9
35.5
38.0
40.3
42.4
44.5
46.5
48.4
50.2
53.7
55.3
56.9
58.5
60.0
63.0
65.8
68.4
71.0
73.5
75.9
80.5
84.9
89.0
93.0
96.8
100.4
104.0
107.4
110.7
113.9
117.0
120.0
123.0
125.9
128.7
131.5
134.2
136.9
139.5
142.0
144.6
147.0
153.0
158.8
164.4
169.8
175.0
180.1
185.0
189.8
199.1
207.9
216.4
224.6
232.5
240.1
247.5
254.7
261.6
31
38
44
49
54
58
62
66
70
73
76
79
82
88
91
93
96
98
103
108
112
116
121
125
132
139
146
153
159
165
171
176
182
187
192
197
202
207
211
216
220
225
229
233
237
241
251
260
270
278
287
295
303
311
327
341
355
368
381
394
406
418
429
44
54
63
70
77
83
89
94
99
104
109
113
118
126
130
133
137
141
148
154
160
166
172
178
189
199
209
218
227
235
244
252
259
267
274
281
288
295
302
308
315
321
327
333
339
345
359
372
385
398
410
422
434
445
467
487
507
526
545
69
85
98
109
120
129
138
146
154
162
169
176
183
195
201
207
213
218
229
239
249
258
267
276
293
309
324
338
352
365
378
391
403
414
426
437
448
458
468
478
488
498
507
517
526
535
557
578
598
618
637
655
673
691
87
107
123
138
151
163
174
185
195
204
213
222
230
246
254
261
268
275
289
302
314
326
337
348
370
390
409
427
444
461
477
493
508
523
537
551
564
578
591
603
616
628
640
652
663
675
702
729
754
105
129
149
166
182
196
210
223
235
246
257
268
278
297
306
315
324
332
348
364
379
393
407
420
446
470
493
515
536
556
575
594
612
630
647
664
681
697
712
728
743
757
772
786
800
814
847
879
155
189
219
244
268
289
309
328
346
362
379
394
409
437
451
464
476
489
513
535
557
578
599
618
656
691
725
757
788
818
846
874
901
927
953
977
1002
1025
1048
1071
1093
1114
1136
1157
1177
1197
1246
1293
267
327
378
422
463
500
534
567
597
626
654
681
707
755
779
801
823
845
886
925
963
999
1034
1068
1133
1194
1253
1308
1362
1413
1463
1511
1557
1602
1646
1689
387
474
547
612
670
724
774
821
866
908
948
987
1024
1095
1129
1161
1193
1224
1284
1341
1396
1448
1499
1548
1642
1731
630
772
891
996
1092
1179
1260
1337
1409
1478
1544
1607
1667
1782
1837
1891
1942
1993
2090
2183
2272
2358
2441
2521
2674
2818
Set pressure - barg
1
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
6.5
7
8
8.5
9
9.5
10
11
12
13
14
15
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
52
54
56
58
60
65
70
75
80
85
90
95
100
110
120
130
140
150
160
170
180
190
200
220
240
260
280
300
320
340
360
380
400
420
TI-7-0213
Weir First choice for power and industrial protection
51
PRESSURE RELIEF VALVES
Sarasin-RSBD
P Series (Starflow) Capacity Tables
Air
Calculation according to API STD 520
Orifices
Set pressure - Psig
sq.in
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
110
120
130
140
150
160
180
200
220
240
260
280
300
320
340
360
380
400
420
440
460
480
500
520
540
560
580
600
650
700
750
800
850
900
950
1000
1100
1200
1300
1400
1500
1600
1700
1800
1900
2000
2200
2400
2600
2800
3000
3200
3400
3600
3800
4000
4500
5000
52
Capacities at 10% overpressure scfm at 32˚F
D
0.110
E
0.196
F
0.307
G
0.503
H
0.785
J
1.287
K
1.838
L
2.853
M
3.60
N
4.34
P
6.38
Q
11.05
R
16
T
26
52
63
74
85
96
107
118
129
141
152
163
174
185
196
207
218
229
240
252
274
296
318
340
362
385
429
473
518
562
606
651
695
740
784
828
873
917
961
1006
1050
1095
1139
1183
1228
1272
1316
1361
1472
1583
1694
1805
1916
2026
2137
2248
2470
2692
2914
3136
3358
3579
3801
4023
4245
4467
4911
5354
5798
6242
6686
7129
7573
8017
8461
8904
10014
11123
92
112
132
152
171
191
211
231
250
270
290
310
330
349
369
389
409
428
448
488
527
567
606
646
685
764
843
923
1002
1081
1160
1239
1318
1397
1476
1555
1634
1713
1792
1871
1950
2029
2109
2188
2267
2346
2425
2622
2820
3018
3215
3413
3611
3808
4006
4401
4797
5192
5587
5983
6378
6773
7169
7564
7959
8750
9541
10331
11122
11913
12703
13494
14284
15075
15866
17842
19819
145
176
207
238
269
299
330
361
392
423
454
485
516
547
578
609
640
671
702
764
826
888
950
1012
1073
1197
1321
1445
1569
1693
1817
1940
2064
2188
2312
2436
2560
2683
2807
2931
3055
3179
3303
3426
3550
3674
3798
4108
4417
4727
5036
5346
5656
5965
6275
6894
7513
8132
8752
9371
9990
10609
11228
11848
12467
13705
14944
16182
17421
18659
19897
21136
22374
23613
24851
27947
31043
237
288
338
389
440
491
541
592
643
694
744
795
846
896
947
998
1049
1099
1150
1252
1353
1454
1556
1657
1759
1962
2165
2368
2570
2773
2976
3179
3382
3585
3788
3991
4194
4397
4600
4802
5005
5208
5411
5614
5817
6020
6223
6730
7237
7745
8252
8759
9266
9774
10281
11295
12310
13324
14339
15354
16368
17383
18397
19412
20426
22455
24484
26513
28542
30572
32601
34630
36659
370
449
528
607
687
766
845
924
1003
1082
1162
1241
1320
1399
1478
1557
1637
1716
1795
1953
2112
2270
2428
2587
2745
3062
3378
3695
4012
4328
4645
4962
5278
5595
5912
6228
6545
6862
7178
7495
7811
8128
8445
8761
9078
9395
9711
10503
11295
12086
12878
13670
14461
15253
16045
17628
19211
20795
22378
23961
25545
27128
28711
30295
31878
35044
38211
41378
606
736
866
996
1126
1255
1385
1515
1645
1775
1904
2034
2164
2294
2424
2553
2683
2813
2943
3202
3462
3721
3981
4241
4500
5019
5539
6058
6577
7096
7615
8134
8654
9173
9692
10211
10730
11249
11769
12288
12807
13326
13845
14364
14884
15403
15922
17220
18518
19816
21114
22411
23709
25007
26305
28901
31497
34093
36688
39284
41880
44476
47072
49668
52263
57455
62647
67838
866
1051
1237
1422
1608
1793
1978
2164
2349
2534
2720
2905
3090
3276
3461
3647
3832
4017
4203
4573
4944
5315
5685
6056
6427
7168
7910
8651
9393
10134
10875
11617
12358
13100
13841
14583
15324
16066
16807
17548
18290
19031
19773
20514
21256
21997
22738
24592
26446
28299
30153
32006
33860
35714
37567
41274
44981
48689
52396
56103
59810
63517
67225
70932
74639
82053
1344
1632
1920
2208
2495
2783
3071
3358
3646
3934
4222
4509
4797
5085
5373
5660
5948
6236
6523
7099
7674
8250
8825
9401
9976
11127
12278
13429
14580
15730
16881
18032
19183
20334
21485
22636
23787
24937
26088
27239
28390
29541
30692
31843
32994
34144
35295
38173
41050
43927
46804
49681
52558
55436
58313
64067
69822
75576
81330
87085
1696
2059
2423
2786
3149
3512
3875
4238
4601
4964
5327
5690
6053
6416
6779
7142
7505
7868
8231
8958
9684
10410
11136
11862
12588
14040
15492
16945
18397
19849
21301
22754
24206
25658
27110
28562
30015
31467
32919
34371
35823
37276
38728
40180
41632
43084
44537
48167
51798
55428
59059
62689
66320
69950
73581
80842
2045
2483
2921
3358
3796
4234
4671
5109
5547
5984
6422
6860
7297
7735
8173
8610
9048
9486
9923
10799
11674
12549
13425
14300
15176
16926
18677
20428
22178
23929
25680
27431
29181
30932
32683
34434
36184
37935
39686
41436
43187
44938
46689
48439
50190
51941
53691
58068
62445
66822
71199
75575
79952
84329
88706
3006
3650
4293
4937
5580
6224
6867
7510
8154
8797
9441
10084
10727
11371
12014
12658
13301
13944
14588
15875
17162
18448
19735
21022
22309
24882
27456
30030
32603
35177
37751
40324
42898
45472
48045
50619
53192
55766
58340
60913
63487
66061
68634
71208
73782
76355
78929
85363
91797
98231
104665
111099
117534
123968
130402
5207
6322
7436
8550
9665
10779
11893
13008
14122
15236
16351
17465
18580
19694
20808
21923
23037
24151
25266
27495
29723
31952
34181
36410
38638
43096
47553
52011
56468
60926
65383
69841
74298
78756
83213
87671
92128
96586
101043
105500
109958
114415
118873
123330
127788
132245
136703
7540
9153
10767
12380
13994
15608
17221
18835
20448
22062
23675
25289
26903
28516
30130
31743
33357
34970
36584
39811
43038
46265
49493
52720
55947
62401
68855
75310
81764
88218
94672
101127
12252
14874
17496
20118
22740
25362
27984
30606
33228
35851
38473
41095
43717
46339
48961
51583
54205
56827
59449
64693
69937
75181
80425
85669
90914
101402
111890
122378
132866
143355
153843
164331
Weir First choice for power and industrial protection
TI-7-0213
PRESSURE RELIEF VALVES
Sarasin-RSBD
P Series (Starflow) Capacity Tables
Saturated steam
Orifices
Set pressure - Psig
sq.in
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
110
120
130
140
150
160
180
200
220
240
260
280
300
320
340
360
380
400
420
440
460
480
500
520
540
560
580
600
650
700
750
800
850
900
950
1000
1100
1200
1300
1400
1500
1600
1700
1800
1900
2000
2200
2400
2600
2800
TI-7-0213
Calculation according to API STD 520
Capacities at 10% overpressure lbs/hr
D
0.110
E
0.196
F
0.307
G
0.503
H
0.785
J
1.287
K
1.838
L
2.853
M
3.60
N
4.34
P
6.38
Q
11.05
R
16
T
26
142
172
202
233
263
293
324
354
384
415
445
475
505
536
566
596
627
657
687
748
809
869
930
991
1051
1172
1294
1415
1536
1657
1779
1900
2021
2143
2264
2385
2506
2628
2749
2870
2991
3113
3234
3355
3476
3598
3719
4022
4325
4628
4932
5235
5538
5841
6144
6751
7357
7963
8569
9176
9782
10388
10995
11601
12207
13420
14633
15845
17058
252
306
360
414
468
522
577
631
685
739
793
847
901
955
1009
1063
1117
1171
1225
1333
1441
1549
1657
1765
1873
2089
2305
2521
2737
2953
3169
3385
3601
3818
4034
4250
4466
4682
4898
5114
5330
5546
5762
5978
6194
6410
6626
7167
7707
8247
8787
9327
9868
10408
10948
12028
13109
14189
15269
16350
17430
18510
19591
20671
21751
23912
26073
28234
30394
395
480
565
649
734
818
903
988
1072
1157
1241
1326
1411
1495
1580
1664
1749
1834
1918
2088
2257
2426
2595
2764
2934
3272
3611
3949
4287
4626
4964
5303
5641
5980
6318
6656
6995
7333
7672
8010
8349
8687
9025
9364
9702
10041
10379
11225
12071
12918
13764
14610
15456
16302
17148
18840
20532
22225
23917
25609
27301
28993
30685
32378
34070
37454
40839
44223
47607
648
786
925
1064
1202
1341
1480
1618
1757
1895
2034
2173
2311
2450
2589
2727
2866
3004
3143
3420
3698
3975
4252
4529
4807
5361
5916
6470
7025
7579
8134
8688
9243
9797
10352
10906
11461
12015
12570
13124
13679
14233
14788
15342
15897
16451
17006
18392
19778
21165
22551
23937
25323
26710
28096
30868
33641
36413
39186
41959
44731
47504
50276
53049
55821
61366
66911
72456
78001
1011
1227
1444
1660
1876
2093
2309
2525
2742
2958
3174
3391
3607
3823
4040
4256
4472
4689
4905
5338
5771
6203
6636
7069
7501
8367
9232
10097
10963
11828
12694
13559
14424
15290
16155
17021
17886
18751
19617
20482
21347
22213
23078
23944
24809
25674
26540
28703
30867
33030
35194
37357
39520
41684
43847
48174
52501
56828
61155
65482
69809
74136
78463
82790
87117
95770
104424
113078
1657
2012
2367
2721
3076
3431
3786
4140
4495
4850
5204
5559
5914
6268
6623
6978
7333
7687
8042
8751
9461
10170
10880
11589
12298
13717
15136
16555
17973
19392
20811
22230
23649
25067
26486
27905
29324
30743
32161
33580
34999
36418
37836
39255
40674
42093
43512
47059
50606
54153
57700
61246
64793
68340
71887
78981
86075
93169
100263
107357
114451
121545
128639
135733
142827
157015
171203
185390
2367
2874
3380
3887
4393
4900
5406
5913
6419
6926
7433
7939
8446
8952
9459
9965
10472
10978
11485
12498
13511
14524
15537
16550
17564
19590
21616
23642
25668
27695
29721
31747
33773
35799
37826
39852
41878
43904
45930
47957
49983
52009
54035
56062
58088
60114
62140
67206
72271
77337
82402
87468
92533
97599
102664
112795
122926
133057
143189
153320
163451
173582
183713
193844
203975
224237
3674
4460
5247
6033
6819
7606
8392
9178
9964
10751
11537
12323
13110
13896
14682
15468
16255
17041
17827
19400
20972
22545
24118
25690
27263
30408
33553
36698
39843
42988
46134
49279
52424
55569
58714
61859
65004
68150
71295
74440
77585
80730
83875
87020
90166
93311
96456
104319
112182
120044
127907
135770
143633
151496
159359
175084
190810
206536
222262
237987
4636
5628
6620
7613
8605
9597
10589
11581
12573
13566
14558
15550
16542
17534
18526
19518
20511
21503
22495
24479
26464
28448
30432
32417
34401
38370
42338
46307
50275
54244
58213
62181
66150
70119
74087
78056
82025
85993
89962
93930
97899
101868
105836
109805
113774
117742
121711
131632
141554
151476
161397
171319
181240
191162
201084
220927
5589
6785
7981
9177
10373
11570
12766
13962
15158
16354
17550
18746
19942
21138
22335
23531
24727
25923
27119
29511
31903
34296
36688
39080
41472
46257
51041
55825
60610
65394
70179
74963
79747
84532
89316
94101
98885
103670
108454
113238
118023
122807
127592
132376
137160
141945
146729
158690
170651
182612
194573
206534
218495
230456
242417
8216
9975
11733
13491
15249
17008
18766
20524
22283
24041
25799
27558
29316
31074
32833
34591
36349
38108
39866
43383
46899
50416
53933
57449
60966
67999
75033
82066
89099
96133
103166
110199
117232
124266
131299
138332
145366
152399
159432
166466
173499
180532
187565
194599
201632
208665
215699
233282
250865
268449
286032
303615
321198
338782
356365
14230
17276
20321
23366
26412
29457
32502
35548
38593
41639
44684
47729
50775
53820
56866
59911
62956
66002
69047
75138
81229
87319
93410
99501
105592
117773
129955
142136
154318
166499
178681
190862
203044
215225
227407
239588
251770
263951
276133
288314
300496
312677
324859
337040
349222
361403
373585
20605
25014
29424
33834
38243
42653
47062
51472
55882
60291
64701
69110
73520
77930
82339
86749
91158
95568
99978
108797
117616
126435
135254
144074
152893
170531
188170
205808
223446
241085
258723
276361
33483
40648
47814
54980
62145
69311
76476
83642
90808
97973
105139
112304
119470
126636
133801
140967
148132
155298
162464
176795
191126
205457
219788
234120
248451
277113
305775
334438
363100
391763
420425
449087
Weir First choice for power and industrial protection
53
PRESSURE RELIEF VALVES
Sarasin-RSBD
P Series (Starflow) Capacity Tables
Water
Calculation according to API STD 520
Orifices
Set pressure - Psig
sq.in
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
110
120
130
140
150
160
180
200
220
240
260
280
300
320
340
360
380
400
420
440
460
480
500
520
540
560
580
600
650
700
750
800
850
900
950
1000
1100
1200
1300
1400
1500
1600
1700
1800
1900
2000
2200
2400
2600
2800
3000
3200
3400
3600
3800
4000
4500
5000
54
Capacities at 10% overpressure usgpm
D
0.110
E
0.196
F
0.307
G
0.503
H
0.785
J
1.287
K
1.838
L
2.853
M
3.60
N
4.34
P
6.38
Q
11.05
R
16
T
26
142
172
202
233
263
293
324
354
384
415
445
475
505
536
566
596
627
657
687
748
809
869
930
991
1051
1172
1294
1415
1536
1657
1779
1900
2021
2143
2264
2385
2506
2628
2749
2870
2991
3113
3234
3355
3476
3598
3719
4022
4325
4628
4932
5235
5538
5841
6144
6751
7357
7963
8569
9176
9782
10388
10995
11601
12207
13420
14633
15845
17058
18271
19483
20696
21909
23121
24334
27365
30397
252
306
360
414
468
522
577
631
685
739
793
847
901
955
1009
1063
1117
1171
1225
1333
1441
1549
1657
1765
1873
2089
2305
2521
2737
2953
3169
3385
3601
3818
4034
4250
4466
4682
4898
5114
5330
5546
5762
5978
6194
6410
6626
7167
7707
8247
8787
9327
9868
10408
10948
12028
13109
14189
15269
16350
17430
18510
19591
20671
21751
23912
26073
28234
30394
32555
34716
36876
39037
41198
43358
48760
54162
395
480
565
649
734
818
903
988
1072
1157
1241
1326
1411
1495
1580
1664
1749
1834
1918
2088
2257
2426
2595
2764
2934
3272
3611
3949
4287
4626
4964
5303
5641
5980
6318
6656
6995
7333
7672
8010
8349
8687
9025
9364
9702
10041
10379
11225
12071
12918
13764
14610
15456
16302
17148
18840
20532
22225
23917
25609
27301
28993
30685
32378
34070
37454
40839
44223
47607
50992
54376
57760
61145
64529
67913
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TI-7-0213
Weir First choice for power and industrial protection
59
Weir-BDK Valves
Rue J. B. Grison - ZI Bois Rigault
62880 Vendin Le Vieil - France
Tel:
+33 (0) 3 21 79 54 50
Fax: +33 (0) 3 21 28 62 00
Email: sarasin.rsbd@weirgroup.com
Unit Weir India Pvt Limited
47/48 Gokul Road
Hubli-580030 - Karnataka - India
Tel:
+91 836 4248222/4248223
Fax: +91 836 2330799
Email: india.sarasin-rsbd@weirgroup.com
© Weir, all rights reserved.
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Engineering
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TI-7-0213
Weir Power & Industrial France SAS