TECHNICAL SPECIFICATION
VALVES – GENERAL REQUIREMENTS
MESC SPE 77/302
February 2022
MESC SPECIFICATION DOCUMENT
This document is restricted. Neither the whole nor any part of this document may be disclosed to any third party without the prior written consent of Shell Global
Solutions International B.V., The Netherlands. The copyright of this document is vested in this company. All rights reserved. Neither the whole nor any part of this
document may be reproduced, stored in any retrieval system or transmitted in any form or by any means (electronic, mechanical, reprographic, recording or otherwise)
without the prior written consent of the copyright owner.
MESC SPE 77/302
February 2022
Page 2
PREFACE
MESC (Materials and Equipment Standards and Code) SPE documents reflect the views, at the time of publication, of:
Shell Global Solutions International B.V. (Shell GSI)
and/or
Shell International Exploration and Production B.V. (SIEP)
and/or
other Shell Service Companies.
They are based on the experience acquired during their involvement with the design, construction, operation and
maintenance of processing units and facilities, and they are supplemented with the experience of Shell Operating Units.
Where appropriate they are based on, or reference is made to, international, regional, national and industry standards.
The objective is to set the recommended standard for good design and engineering practice applied by Shell companies
operating an oil refinery, gas handling installation, chemical plant, oil and gas production facility, or any other such facility,
and thereby to achieve maximum technical and economic benefit from standardization.
The information set forth in these publications is provided to Shell companies for their consideration and decision to
implement. This is of particular importance where MESC SPEs may not cover every requirement or diversity of condition
at each locality. The system of MESC SPEs is expected to be sufficiently flexible to allow individual Operating Units to
adapt the information set forth in MESC SPEs to their own environment and requirements.
When Contractors or Manufacturers/Suppliers use MESC SPEs they shall be solely responsible for the quality of work
and the attainment of the required design and engineering standards. In particular, for those requirements not specifically
covered, the Principal will expect them to follow those practices, which will achieve the same level of integrity as reflected
in the MESC SPEs. If in doubt, the Contractor or Manufacturer/Supplier shall, without detracting from his own
responsibility, consult the Principal or its technical advisor.
The right to use MESC SPEs is granted by Shell GSI, in most cases under Service Agreements primarily with Shell
companies and other companies receiving technical advice and services from Shell GSI or another Shell Service
Company. Consequently, three categories of users of MESC SPEs can be distinguished:
1)
Operating Units having a Service Agreement with Shell GSI or other Shell Service Company. The use of MESC
SPEs by these Operating Units is subject in all respects to the terms and conditions of the relevant Service
Agreement.
2)
Other parties who are authorized to use MESC SPEs subject to appropriate contractual arrangements (whether
as part of a Service Agreement or otherwise).
3)
Contractors/subcontractors and Manufacturers/Suppliers under a contract with users referred to under 1) or 2)
which requires that tenders for projects, materials supplied or - generally - work performed on behalf of the said
users comply with the relevant standards.
Subject to any particular terms and conditions as may be set forth in specific agreements with users, Shell GSI disclaims
any liability of whatsoever nature for any damage (including injury or death) suffered by any company or person
whomsoever as a result of or in connection with the use, application or implementation of any MESC SPE, combination
of MESC SPEs or any part thereof, even if it is wholly or partly caused by negligence on the part of Shell GSI or other
Shell Service Company. The benefit of this disclaimer shall inure in all respects to Shell GSI and/or any Shell Service
Company, or companies affiliated to these companies, that may issue MESC SPEs or require the use of MESC SPEs.
Without prejudice to any specific terms in respect of confidentiality under relevant contractual arrangements, MESC SPEs
shall not, without the prior written consent of Shell GSI, be disclosed by users to any company or person whomsoever
and the MESC SPEs shall be used exclusively for the purpose for which they have been provided to the user. They shall
be returned after use, including any copies, which shall only be made by users with the express prior written consent of
Shell GSI. The copyright of MESC SPEs vests in Shell GSI. Users shall arrange for MESC SPEs to be held in safe custody
and Shell GSI may at any time require information satisfactory to them in order to ascertain how users implement this
requirement.
All administrative queries should be directed to the MESC SPE Administrator in Shell GSI.
MESC SPE 77/302
February 2022
Page 3
TABLE OF CONTENTS
PART I
1.1
1.2
1.3
1.4
1.5
INTRODUCTION ........................................................................................................ 5
SCOPE........................................................................................................................ 5
DISTRIBUTION, INTENDED USE AND REGULATORY CONSIDERATIONS ......... 5
DEFINITIONS ............................................................................................................. 5
CHANGES SINCE PREVIOUS EDITION ................................................................... 6
COMMENTS ON THIS MESC SPE ............................................................................ 6
PART II
1.
2.
2.1
2.1.1
2.1.2
2.1.3
2.1.4
2.1.5
2.1.6
2.1.7
2.1.8
2.2
2.2.1
2.2.2
2.2.3
2.2.4
2.2.5
2.2.6
2.2.7
2.3
2.3.1
2.3.2
2.3.3
2.3.4
2.3.5
2.4
2.4.1
2.4.2
2.4.3
2.4.3.1
2.4.4
2.5
2.5.1
2.5.2
2.6
2.7
2.8
2.9
3.
4.
5.
6.
7.
7.1
7.2
VALVE GENERAL REQUIREMENTS ........................................................................ 7
INTRODUCTION ........................................................................................................ 7
MATERIAL REQUIREMENTS .................................................................................... 7
CHEMICAL COMPOSITION ....................................................................................... 7
General ....................................................................................................................... 7
Carbon steel ................................................................................................................ 7
1.25Cr-0.5Mo steel ..................................................................................................... 7
2.25Cr-1.0Mo steel ..................................................................................................... 8
Austenitic stainless steel ............................................................................................. 8
Duplex stainless steel ................................................................................................. 9
Alloy 825 ................................................................................................................... 10
Other materials ......................................................................................................... 10
HEAT TREATMENT ................................................................................................. 10
General ..................................................................................................................... 10
Carbon steel .............................................................................................................. 10
Cr-Mo steel................................................................................................................ 10
Austenitic stainless steel ........................................................................................... 11
Duplex stainless steel ............................................................................................... 12
13Cr steel .................................................................................................................. 12
Nickel alloys .............................................................................................................. 12
IMPACT TESTING .................................................................................................... 13
General ..................................................................................................................... 13
Carbon steel .............................................................................................................. 13
Austenitic Stainless Steel .......................................................................................... 13
Duplex stainless steel ............................................................................................... 14
Martensitic stainless steel ......................................................................................... 14
CORROSION TESTING ........................................................................................... 14
Austenitic stainless steel ........................................................................................... 14
Nickel alloys .............................................................................................................. 15
Duplex stainless steels ............................................................................................. 15
Pitting Corrosion ....................................................................................................... 15
Other materials ......................................................................................................... 15
MICROSTRUCTURE DETERMINATION ................................................................. 15
Ferrite/austenite phase balance ............................................................................... 16
Detrimental phases ................................................................................................... 16
TENSILE TESTING .................................................................................................. 16
HARDNESS TESTING ............................................................................................. 17
ELASTOMERIC SEALS ............................................................................................ 18
LAMINATED SEAT RINGS FOR TRIPLE OFFSET BUTTERFLY VALVES ............ 18
WELDING AND HARD FACING REQUIREMENTS................................................. 18
VALVES MANUFACTURED FROM BAR MATERIAL.............................................. 19
LIFTING POINTS ...................................................................................................... 22
PUP PIECES............................................................................................................. 22
NON-DESTRUCTIVE EXAMINATION ..................................................................... 23
INSPECTION SCOPE .............................................................................................. 23
EXECUTION ............................................................................................................. 24
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February 2022
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7.2.1
7.2.2
7.2.3
7.2.4
7.3
8.
9.
9.1
9.2
10.
11.
12.
13.
Methods .................................................................................................................... 24
Execution .................................................................................................................. 24
Acceptance criteria ................................................................................................... 25
Sample strategy and lot acceptance ......................................................................... 26
DEFECT REMOVAL AND WELD REPAIR .............................................................. 27
DOCUMENTATION .................................................................................................. 30
MATERIAL CONTROL, VERIFICATION AND CERTIFICATION ............................. 30
POSITIVE MATERIAL IDENTIFICATION (PMI) ....................................................... 30
CERTIFICATION ...................................................................................................... 32
WITNESSING BY THE PRINCIPAL ......................................................................... 33
VALVES SUPPLIED TO EUROPEAN SITES .......................................................... 33
DESIGN VALIDATION TESTING FOR VALVES ..................................................... 33
VALVES SUPPLIED TO OFFSHORE SITES ........................................................... 33
PART III
REFERENCES ......................................................................................................... 34
MESC SPE 77/302
February 2022
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PART I INTRODUCTION
1.1
SCOPE
This MESC SPE specifies general requirements for valves. It contains requirements for
materials, heat treatment, corrosion testing, welding, NDE and certification (see Part II).
This specification shall apply in addition to the applicable MESC Buying Description,
purchase order or requisition sheet.
1.2
DISTRIBUTION, INTENDED USE AND REGULATORY CONSIDERATIONS
Unless otherwise authorised by Shell GSI, the distribution of this MESC SPE is confined to
Shell companies and, where necessary, to Contractors and Manufacturers/Suppliers
nominated by them.
This MESC SPE is intended for use in oil refineries, chemical plants, gas plants, exploration
and production facilities and, where applicable, supply/distribution installations.
If national and/or local regulations exist in which some of the requirements may be more
stringent than in this MESC SPE the Contractor shall determine by careful scrutiny which of
the requirements are the more stringent and which combination of requirements will be
acceptable with regards to safety, environmental, economic and legal aspects. In all cases
the Contractor shall inform the Principal of any deviation from the requirements of this MESC
SPE which is considered to be necessary in order to comply with national and/or local
regulations. The Principal may then negotiate with the Authorities concerned, the objective
being to obtain agreement to follow this MESC SPE as closely as possible.
1.3
DEFINITIONS
The Contractor is the party that carries out all or part of the design, engineering,
procurement, construction, commissioning or management of a project, or operation or
maintenance of a facility. The Principal may undertake all or part of the duties of the
Contractor.
The Inspector is the party appointed by the Principal to check that the products supplied
comply with this MESC SPE.
The Manufacturer/Supplier is the party that manufactures or supplies equipment and
services to perform the duties specified by the Contractor.
The Principal is the party that initiates the project and ultimately pays for its design and
construction. The Principal will generally specify the technical requirements. The Principal
may also include an agent or consultant authorised to act for, and on behalf of, the Principal.
The word shall indicates a requirement.
The word should indicates a recommendation.
Statistical process control (SPC) is the application of statistical methods to the monitoring
and control of a process to ensure that it operates at its full potential to produce conforming
product. Under SPC, a process behaves predictably to produce as much conforming product
as possible within defined control limits, with the least possible waste. SPC is applied to
controlling manufacturing lines and to any process with a measurable output. Key tools in
SPC are control charts, a focus on continuous improvement and designed experiments. In
order to avoid over-application of inspection and testing per batch, particularly for smaller
batches, pro-active application of statistical process control of parameters which are critical
to the manufacturer to produce goods to the intended quality level is deemed a strong enabler
to achieve product quality. Statistical process control can be demonstrated by e.g.,
satisfactory tests carried out for other customers. In case no other formal NDE is required,
MESC SPE 77/302
February 2022
Page 6
when SPC is specified, periodic sampling and testing of materials supplied is expected (i.e.,
less than 100%). ISO 11462 and ISO 2859/ISO 3951 provide further guidance for the
implementation of SPC and sampling procedures. Statistical process control is different from
the required NDE (resulting in certificates submitted with the order), in that records shall be
auditable, but records do not need to be submitted with every order.
1.4
CHANGES SINCE PREVIOUS EDITION
The previous edition of this MESC SPE was dated February 2021. The changes are to:
1.5
•
update the paint system in section 13 in line with the latest MESC SPE 77/310
•
delete Cast ASTM A494 CW12MW requirements as the (butt welded) valves
with this material were deleted from the MESC (welding of this material is not
allowed as per the B31.3)
•
add minimum carbon content requirements requirement for cast ASTM A351
gr. CF8C, in applications having a design temperature between 538°C (1000 °F)
and 816 °C (1500 °F)
•
rectify the intergranular corrosion test for 6 Moly bolting and to exclude
stainless steel nuts grade 8MLCuNA from strain hardening.
•
add Cast ASTM A494 CW6-MC hot yield test requirements, as this is a ASME
B31.3 and ASME II, part D unlisted material
•
change the capability to withstand the Pressure Temperature ratings in
accordance with ASME B16.34 group 2.11 (new group in ASME B16.34
specifically for ASTM A358 CF8C) instead of group 2.4
•
Incorporate requirements for castings as per ASTM A217 Grade C12A
(9Cr- 1Mo-V) and forgings as per ASTM A182 grade F91 (9Cr-1Mo-V)
COMMENTS ON THIS MESC SPE
Comments on this MESC SPE may be sent to the MESC SPE Administrator at
MESC@shell.com.
MESC SPE 77/302
February 2022
Page 7
PART II VALVE GENERAL REQUIREMENTS
1.
INTRODUCTION
The requirements specified in this part are the general requirements for valves.
2.
MATERIAL REQUIREMENTS
2.1
CHEMICAL COMPOSITION
2.1.1
General
Unless specified otherwise, the restrictions in the chemical composition contained in clauses
2.1.2 through 2.1.8 apply to the pressure containing parts of the valve (body, bonnet and
cover) and the stem for each valve.
2.1.2
Carbon steel
Carbon steel forgings to ASTM A105 and to ASTM A350 Grade LF2 Class 1 shall have the
following restrictions in their chemical composition:
-
The carbon content shall not exceed 0.23 %.
-
The carbon equivalent (CE) shall not exceed 0.43.
-
The Silicon content of ASTM A105 shall not be lower than 0.15 %wt.
Carbon steel castings to ASTM A216 Grades WCB and WCC and to ASTM A352 Grade LCC
shall have the following restrictions in their chemical composition:
-
The carbon content shall not exceed 0.25 %.
-
The sulphur content shall not exceed 0.020 %.
-
The phosphorus content shall not exceed 0.025 %.
-
The carbon equivalent (CE) shall not exceed 0.43.
The carbon equivalent (CE) shall be calculated with the following formula:
CE = C +
2.1.3
Mn Cr + Mo + V Ni + Cu
+
+
,
6
5
15
1.25Cr-0.5Mo steel
The chemical composition of 1¼Cr-½Mo forgings to ASTM A182 Grade F 11 base
materials shall meet the following additional chemical requirements by heat analysis:
Element
Max
allowed
C
0.15%
P
0.012
wt%
S
0.007
wt%
Cu
0.20%
Ni
0.30%
X-bar
14 ppm
X-bar shall be calculated with the following formula:
X - bar =
10P + 5Sb + 4Sn + As
, with P, Sb, Sn and As values in ppm.
100
If meeting the above requirement leads to unacceptable lead times or cost increase, F22
material may be selected for: 350 ̊C (750 ̊F) ≤ design temperature ≤ 450 ̊C (840 ̊F). In case
MESC SPE 77/302
February 2022
Page 8
the design temperature exceeds 450 ̊C (840 ̊F), F22 material compliant with additional
requirements in accordance (2.1.4) may be selected. F11 materials not meeting above
chemical composition requirements shall not be accepted in case the design temperature
exceeds 350 ̊C (750 ̊F).
Unless specified otherwise, 1.25Cr-0.5Mo castings to ASTM A217 Grade WC6 shall have
the following restriction in the chemical composition:
2.1.4
The phosphorous content shall not exceed 0.010 %.
2.25Cr-1.0Mo steel
Except where steam service is designated in the MESC specification, or unless specified
otherwise, the restrictions in the chemical composition of 2.25Cr-1.0Mo forgings to
ASTM A182 Grade F22 shall be one of the following two options:
1. The carbon content shall not exceed 0.14 % and both the phosphorous and sulphur
content shall not exceed 0.010 %.
2. The J-factor shall be calculated in accordance with API 934 and shall not exceed 120.
For valves furnished to ASTM A182 Grade F22 where steam service is designated in the
MESC specification, the following shall apply:
1. The J-factor shall be calculated in accordance with API 934 and shall not exceed 180.
2.1.5
9Cr-Mo-V Steel
The chemical composition of 9Cr-1Mo-V forgings to ASTM A182 Grade F91 and
ASTM A217 grade C12A base materials shall meet the following additional chemical
requirements:
1. ASTM A182 grade F91 shall be type 2
2.
Element
P
As+Sn+Sb+Pb
Max Allowed
0.015 wt%
0.010 wt%
3. The ration of nitrogen to Aluminium (N/Al) shall have a minimum value of 4.0
2.1.6
Austenitic stainless steel
For valves with a design temperature ≤ 450 ⁰C (≤ 840 ⁰F), the carbon content of austenitic
stainless steel forgings to ASTM A182 Grade F316 and castings to ASTM A351 Grade CF8M
shall not exceed 0.03 % by mass, except a carbon content up to 0.08 % by mass is
permissible under the following conditions:
1.
If the material is stabilised with niobium through substitution with ASTM A351
grade CF10MC, or
2.
If the material is stabilised with titanium through substitution with ASTM A182
grade F 316Ti, or
3.
For components that contain no welds: if the valve design temperature is
≤ 427 ⁰C (≤ 800 ⁰F), or
4.
For valve bodies and bonnets, of designs without welded bonnet or other fabrication
welds, where the valve design temperature is ≤ 427 ⁰C (≤ 800 ⁰F), cast to ASTM A351:
MESC SPE 77/302
February 2022
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if additional requirement S50 is applied (post weld solution heat treatment after casting
repairs) - before Stelliting if applicable.
a. Minor repair by welding without solution heat treatment is acceptable, provided it is
in the gasket seating area (under compressive load and not wetted). The cumulative
size of all repairs on one face shall be smaller than twice the size of imperfections
allowed by ASME B16.5.
For applications having a design temperature greater than 450 °C (840 °F) and up to and
including 816 °C (1500 °F), the following applies:
1. Castings to ASTM A351 Grade CF8M: supplementary requirement S50 applies and in
addition all castings require corrosion testing per ASTM A262, Practice E.
2. Forgings to ASTM A182, bars to ASTM A479 and plates to ASTM A240 for Grade
F316H: repair by welding is not permitted and in addition corrosion testing per
ASTM A262, Practice E shall be executed as statistical process control.
For Castings to ASTM A351 Gr. CF8C in applications having a design temperature
greater than 538°C (1000 °F) and up to and including 816 °C (1500 °F), the carbon content
shall be 0.04% or higher.
2.1.7
Duplex stainless steel
All duplex stainless steel castings, forgings and bar material (not limited to pressure
containing parts) shall have the following restrictions in the chemical composition:
1. For “22Cr” duplex (austenitic-ferritic) stainless steels, the Pitting Resistance Equivalent
(PREN) shall be 34 or higher and the Mo mass fraction (wMo) 2.5% or higher and the
N fraction (wN) 0.14% or higher.
2. For “25Cr” super duplex (austenitic-ferritic) stainless steels, the Pitting Resistance
Equivalent (PREN) shall higher than 40 and the N fraction (wN) 0.20% or higher.
3. The PREN shall be calculated as given in Equation (1):
PREN = wCr + 3.3(wMo + 0.5wW) + 16wN (1)
where
•
wCr is the mass fraction of chromium in the alloy, expressed as a percentage
mass fraction of the total composition;
•
wMo is the mass fraction of molybdenum in the alloy, expressed as a percentage
mass fraction of the total composition;
•
wW is the mass fraction of tungsten in the alloy, expressed as a percentage mass
fraction of the total composition;
•
wN is the mass fraction of nitrogen in the alloy, expressed as a percentage mass
fraction of the total composition.
4. Per lot, one product analysis shall be made. One lot is defined as a group of valves of
similar dimensions, manufactured from one heat of material and heat treated as one
heat treatment batch.
Duplex stainless steel castings to ASTM A890 and ASTM A995 Grade 4a shall have the
following restrictions in the chemical composition:
1. The U-factor shall be at least 25.
2. The U-factor shall be calculated with the following formula:
U = −43.64+ (4.76 Si) + (2.65 Cr ) + (3.44 Mo) , with the values in %.
MESC SPE 77/302
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Manufacturer shall be qualified according to NORSOK M-650 or through the TAMAP audit
process. NORSOK M-650 certification (if applicable) shall be submitted as part of
documentation.
2.1.8
Alloy 825
Alloy N08825 (Alloy 825) shall be supplied with Nickel content greater than 39% and a PREN
greater than 30.
2.1.9
Other materials
The restrictions in the chemical composition of other materials shall conform to:
1.
Castings to ASTM A487-CA6NM and ASTM A743-CA6NM shall have a carbon content
of 0.03 % maximum.
2.
Castings to ASTM A351-CN7M, ASTM A743-CN7M and ASTM A744-CN7M shall have
a carbon content of 0.03 % maximum and a sulphur content of 0.02 % maximum.
2.2
HEAT TREATMENT
2.2.1
General
All heat treatment procedures shall be subject to a statistical process control (see 1.3) to
ensure that the final material properties comply with the applicable material standard and this
MESC SPE. Statistical process control is not required for heat treatment records that are
supported by a type 3.1 certificate.
Post-weld heat treatment (PWHT) shall be performed as required in the applicable material
standard and ASME B31.3. Unless specified otherwise, PWHT only applies to all welds
affecting the integrity of the pressure retaining boundary and does therefore not necessarily
apply to tack welds, seal welds or attachment welds such as those for backseat bushings,
seat rings, lifting lugs and auxiliary connections.
2.2.2
Carbon steel
Carbon steel forgings to ASTM A105 shall be furnished in the normalised condition or
quenched and tempered condition. Forgings produced in accordance with ASTM A105
furnished in the quenched and tempered condition, shall at least show a microstructure equal
to the normalized condition, and shall be able to meet additional requirement S1.1.
2.2.3
Cr-Mo steel 1.25Cr-0.5Mo, 2.25Cr-1.0Mo, 5Cr-0.5Mo and 9Cr-1.0Mo
Cr-Mo forgings and castings of flanged-end valves shall be furnished in the normalised and
tempered condition.
Forgings and castings of welded-end valves shall conform to either of the following two
options:
1.
The forgings and castings shall be supplied in the normalised and tempered condition.
The tempering temperature shall be 740°C ± 8°C (1365°F ± 13°F). The forgings and
castings shall be furnished in the post weld heat treated condition if fabrication welding
or weld repair has been carried out. The post weld heat treatment temperature shall be
715 °C ± 10°C (1318 °F ± 18°F). The tensile properties shall be in accordance with the
material standard.
2.
The forgings and castings shall be supplied in the normalised and tempered condition.
The minimum tempering temperature shall be 720°C (1330°F). The forgings and castings
shall be furnished in the post weld heat treated condition if fabrication welding or weld
MESC SPE 77/302
February 2022
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repair has been carried out. After all processing, one sample from each heat shall
undergo three simulated PWHT cycles at 730°C ±8°C (1345°F ± 14°F) with a holding
time as per ASME B31.3 Table 331.1.1 for each cycle. Tensile tests according to the
material standard shall be performed after each cycle. If results from all tests are conform
to the material standard, all forgings and castings from that heat are accepted.
2.2.4
Cr-Mo steel 9Cr-1.0Mo-V
Forgings and castings of ASTM A182 Grade F91 and ASTM A217 grade C12A
respectively shall be supplied in the normalized and tempered condition in
accordance with the following requirements:
1. The normalizing temperature range shall be 1049 °C – 1079 °C (1920 °F – 1975 °F).
Once the normalizing temperature is reached throughout the forging or casting,
the temperature shall be held for a minimum of 10 minutes.
2. Only furnace heating shall be permitted. Resistance heating pads or induction
heating shall not be permitted.
3. The forging or casting shall be air cooled to at least 93 °C (200 °F) after normalizing
and before tempering. For the range of 899 °C - 482 °C (1650 °F - 900 °F), the
cooling rate shall be no slower than 5 °C/min (9 °F/min).
4. After cooling, the forging or casting shall be tempered in the range of
732 °C – 780 °C (1350 °F - 1436 °F).
5. After tempering, the forging or casting shall be cooled in still air or by furnace
cooling. If the forging or casting is cooled by furnace cooling, the cooling rate
shall be a minimum of 56 °C/hr (100 °F/hr) until the internal temperature is below
650 °C (1200 °F).
Care shall be taken to avoid excessive distortion and excessive thermal stress.
If multiple forgings or castings are heat treated simultaneously, they shall be properly
separated to ensure uniform heating and cooling.
The heat treatment temperature shall not exceed the lower critical transformation
(Ac1) temperature of ASTM A182 Grade F91 for forings or the lower critical
transformation (Ac1) temperature of ASTM A217 Grade C12A for castings.
For thick forgings or castings, the cooling rate shall be sufficiently rapid until the
temperature at the centre of the forging or casting falls below 540 °C (1000 °F), after
which the forging or casting shall be cooled in still air or equivalent to below 93 °C
(200 °F).
For cooling of thick forgings or casting (thickness >76 mm (3 in)) after normalizing
and after tempering, forced air-cooling, oil quenching or an equivalent may be
necessary.
In addition, post-weld heat treatment is required after weld repairs in welded areas.
2.2.5
Austenitic stainless steel
Austenitic stainless steel forgings and castings shall be furnished in the solution heat-treated
condition.
Heat treatment of CN7M castings shall be held at the solution annealing temperature for
1 hour per inch of thickness with a minimum hold time of 1 hour.
Subsequent to the required solution heat treatment, if specified for type 321, 321H, 347,
347H, 348, 348H, CF8C or CF10MC, austenitic stainless steel materials shall also be
MESC SPE 77/302
February 2022
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subjected to a stabilisation heat-treatment with a stabilising temperature between
870 °C (1598 °F) and 900 °C (1652 °F), and a duration of 4 hours.
2.2.6
Duplex stainless steel
The heat treatment of (super) duplex (austenitic – ferritic) stainless steel forgings, bar and
castings shall comply with the following:
2.2.7
1.
Forgings, castings or bars shall be solution annealed at a temperature that is within the
temperature range specified in the applicable material standard, for a minimum of
30 minutes per inch of thickness or a minimum of one hour, whichever is the greater.
2.
The thickest section of the forging, casting or bar shall be used to determine the soak
time at the solution annealing temperature.
3.
Immediately (within 60 seconds) after solution annealing, forgings, castings or bars shall
be water quenched. The start and end temperature of the quenching water shall not
exceed 40 °C (104 °F). The temperature of the quenching water shall be recorded during
quenching and not exceed 50 °C (122 °F).
4.
The Manufacturer may submit an alternative solution annealing procedure for review and
approval by the Principal.
13Cr steel
The heat treatment of 13Cr castings to ASTM A487-CA6NM shall consist of normalising and
double tempering as follows:
2.2.8
1.
Austenitising at 1010 °C (1850 °F) to 1065 °C (1950 °F), followed by air-cooling to room
temperature.
2.
Intermediate tempering at 675 °C (1250 °F) ± 15 °C (± 25 °F), followed by air-cooling to
room temperature.
3.
Final tempering at 610 °C (1125 °F) to 620 °C (1150 °F), followed by air-cooling to room
temperature.
Nickel alloys
1.
Nickel alloy castings to ASTM A494 Grade N-7M shall be solution annealed at 1180 °C
[–10 °C / +20 °C] (2156 °F [–18 °F / +36 °F]), after PWHT. Annealing at other
temperatures may be accepted, provided the qualification tests show that this leads to a
fully solution annealed structure that is free of precipitates. This is subject of approval by
the Principal.
2.
If specified, PWHT for Alloy 400 forgings to ASTM B564 UNS N04400 or castings to
ASTM A494 Grade M35-1, shall be carried out at 590 °C (1094 °F) for at least 1 hour.
3.
Valves manufactured from Cast ASTM A494 CY-40 CLASS 2 and ASTM A494 grade
CW- 6MC shall be capable of withstanding the Pressure Temperature ratings in
accordance with ASME B16.34 group 2.11. Each heat of material shall be subjected to
a hot yield test at 300 °C (572 °F) with a minimum yield strength value of 150 MPa
(21.8 ksi).
4.
Valves manufactured from Cast ASTM A494 CU5MCuC shall be capable of withstanding
the Pressure Temperature ratings in accordance with ASME B16.34 group 3.8. Each
heat of material shall be subjected to a hot yield test at 400 °C (752 °F) with a minimum
yield strength value of 192 MPa (27.8 ksi).
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2.3
IMPACT TESTING
2.3.1
General
Impact testing is required where this is a requirement of the applicable standard specification
or design code such as ASME B31.3. Exemption from impact testing or relaxation of the
minimum impact toughness requirement as permitted in the design codes, when the design
stress is reduced relative to the allowable stress, shall only be invoked with the approval of
the principal.
A minimum of one set of impact tests, comprising of three individual tests, shall be
performed on a representative test bar of each heat of the material in the final heat-treated
condition.
Test specimens shall be cut from a separate or attached block taken from the same heat,
reduced by forging where applicable, and heat-treated to the same heat treatment, including
stress-relieving, as the product materials, except that it is not necessary to retest pressurecontaining parts stress-relieved at or below a previous stress-relieving or tempering
temperature.
Impact test specimens shall be located at mid thickness.
Where sub-size specimens are permitted or necessary, the required absorbed energy shall
be adjusted accordingly by the ratio of the specimen width parallel to the notch to the width
of a full-size specimen (10mm) as indicated in ASTM A370.
Additional requirements for quality control purposes are given here for certain valve
materials.
For the impact values of material types and grades listed below, below listed values shall
prevail.
2.3.2
Carbon steel
Impact testing is required for pressure containing parts of low temperature carbon steel
forgings and castings, in cases indicated in the ASTM standard or the applicable design
code.
Low temperature carbon steel valves shall be impact tested at a temperature of minus
50 °C (minus 58 °F). Impact test results as an average of three tests shall be at least
27 J (20 ft.lbs) for standard size specimen (10 mm x 10 mm). Only one result may be lower
than 27 J (20 ft.lbs), but it shall be at least 20 J (15 ft.lbs).
Alternatively, the impact tests may be carried out at minus 46 °C (minus 50 °F) but the impact
test results as an average of three tests shall be at least 33 J (24 ft.lbs) for standard size
specimens (10 mm x 10 mm). Only one result may be lower than 33 J (24 ft.lbs), but it shall
be at least 26 J (19 ft.lbs).
If nuts of grade 4, 7 or 7M are specified, ASTM A194 Supplementary Requirement S3 shall
apply.
2.3.3
Austenitic Stainless Steel
Where lower design temperature is indicated as below -101 °C (-150 °F), welds are to be
made in accordance with a welding procedure qualified by impact testing as required by
ASME B31.3.
Where XM-19 materials are offered for parts of valves with a minimum design temperature
lower than -29 °C (-20 °F), these parts shall be subject to impact tests in accordance with
ASTM A370 at the minimum design temperature. Impact test results as an average of three
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tests shall be at least 27 J (20 ft.lbs) for standard size specimen (10 mm x 10 mm). Only one
result may be lower than 27 J (20 ft.lbs), but it shall be at least 20 J (15 ft.lbs). All specimen
shall have a lateral expansion opposite the notch of not less than 0.38 mm (0.015 in.).
2.3.4
Duplex stainless steel
Charpy impact testing shall be carried out in accordance with ISO 17781. The acceptance
criteria of Quality Level 1 shall apply. Both the parent metal and, if present, the welds shall
be tested, at specimens as per section 4.1 of ISO 17781.
The lateral expansion shall be determined and reported.
2.3.5
Martensitic stainless steel
Impact testing is required for pressure containing parts of:
1.
Martensitic stainless steel forgings to ASTM A182 Grade F6NM;
2.
Martensitic stainless steel castings to ASTM A487 Grade CA6NM and ASTM A743
Grade CA6NM.
Impact test results for martensitic stainless steels shall be at least 27J (20 ft.lbs) at
21°C (70 °F) for standard size specimen of 10 mm x 10 mm (0.39 in x 0.39 in).
2.3.6
Cr-Mo steel 9Cr-1.0Mo-V
Impact testing is required for pressure containing parts of:
1.
Cr- Moly forgings to ASTM A182 Grade F91;
2.
Cr-Mo castings to ASTM A217 Grdae C12A.
One set of Charpy impact tests in accordance with ASTM A370 shall be performed on
one product from each heat lot.
The impact specimens may be removed from prolongations or extra stock, where
feasible, to prevent destruction of usable product.
The transverse Charpy impact tests shall be performed on standard size specimen of
10 mm x 10 mm (0.39 in x 0.39 in) at 20°C (68°F). Acceptance criteria are average of
34J (25 ft-lbs) with no single value less than 22J (16ft-lbs).
2.4
CORROSION TESTING
2.4.1
Austenitic stainless steel
For austenitic stainless steel valves (both cast and forged), statistical process control
(see 1.3) of corrosion testing is applicable to pressure containing parts (body, bonnet, stem).
All austenitic stainless steel forgings and castings shall be subject to statistical process
control (see 1.3), which shall include intergranular corrosion testing in accordance with
ASTM A262, Practice E.
Castings to CN7M shall be subject to statistical process control (see 1.3), which shall include
intergranular corrosion testing in accordance with ASTM G28, Method A with an exposure of
120 hours. The maximum allowed corrosion rate is 0.10 mm/month (0.0040 in/month).
Bolting materials of grades B8, B8M and B8M2 shall be capable of passing an intergranular
corrosion test in accordance with ASTM A262, Practice E.
If nuts of grade 8, 8C, 8M or 8MA are specified, the following requirements shall apply:
MESC SPE 77/302
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1.
The nut material shall be capable of passing an intergranular corrosion test in
accordance with ASTM A262, Practice E.
2.
For grade 8, 8C and 8M, Supplementary Requirement S1 of ASTM A194 applies.
Practice A of ASTM A262 may be used as a quick screening test. If the Practice A test
outcome is “Acceptable”, the Practice E test may be omitted. If the outcome of the Practice
A test is “Suspect”, then Practice E shall be executed as the final acceptance test.
Bolts of grade B8MLCuN and nuts of grade 8MLCuNA/ 8MLCuN shall be subjected to
a ferric chloride test in accordance with ASTM G48, Method A. The test temperature
shall be 50 °C (122 °F) and the exposure time shall be 24 hours. The test specimens
shall be in the as-delivered condition. The test shall expose the complete external
surface. No pitting is acceptable at internal or external surfaces at 20 times
magnification. The weight loss shall be < 4.0 g/m² (0.013 oz/ft²).
2.4.2
Nickel alloys
For nickel alloy valves (both cast and forged), statistical process control (see 1.3) of corrosion
testing is applicable to pressure containing parts (body, bonnet, stem).
Alloy 625 and 825 castings and forgings shall be subject to statistical process control (see
1.3), which shall include intergranular corrosion testing in accordance with ASTM G28,
Method A. The test temperature shall be 120 °C (248 °F) and the exposure time shall be
120 hours. Evaluation shall be by weight loss measurements and microscopic examination
of the cross-section (magnification shall be 50 times). The maximum allowed corrosion rate
is 0.08 mm/month (0.0030 in/month) (weight loss) and absence of preferential attack at the
grain boundaries (microscopic examination).
Alloy 600 and Alloy 800 castings and forgings shall be subject to statistical process control
(see 3.1), which shall include intergranular corrosion testing in accordance with ASTM G28,
Method A. The maximum allowed corrosion rate is respectively 0.05 mm/month
(0.0020 in/month) and 0.04 mm/month (0.0015 in/month).
Castings to CW12MW and rod to ASTM B574 UNS N10276 shall be subject to statistical
process control (see 1.3), which shall include intergranular corrosion testing in accordance
with ASTM G28, Method A with an exposure of 24 hours. The maximum allowed corrosion
rate is 0.75 mm/month (0.030 in/month).
Alternative methods are subject of approval by the Principal.
2.4.3
Duplex stainless steels
2.4.3.1
Pitting Corrosion
Pitting tests shall be carried out in accordance with ISO 17781 on parent metal and, if present,
the welds.
The same specimen shall not be re-tested.
2.4.4
Other materials
For other materials, where intergranular corrosion could be a concern, statistical process
control (see 1.3) shall be applied, including intergranular corrosion testing with a relevant
test. The procedure and acceptance criteria shall be submitted to the Principal for approval.
2.5
MICROSTRUCTURE DETERMINATION
The microstructure of (super) duplex (ferritic-austenitic) pieces shall be determined as per
sections 2.5.1 and 2.5.2 and for 9Cr-1Mo-V as per section 2.5.3.
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Microstructure examination shall be carried out in accordance with ISO 17781 section 5.2.
2.5.1
Ferrite/austenite phase balance
The ferrite / austenite phase balance shall be determined in accordance with ISO 17781
section 5.3 on one test piece from one valve representing each lot.
For duplex and super-duplex stainless steel weld qualification, the qualification welds shall
be subject to a ferrite check as follows:
A full cross-section of the seam weld shall be examined as well. Here, the ferrite content
shall be measured 1 mm (0.04 in) from both the internal and external surfaces of;
-
the parent material;
the weld metal;
the Heat Affected Zone within 0.2 mm (0.08 in) of the fusion line (FL).
In addition, for duplex and super-duplex stainless steel welds supplied in the as welded
condition (e.g., welds between pup-pieces and valve bodies), the production welds shall be
subject to a 100% ferrite check as follows:
2.5.2
1.
The % ferrite range shall be checked using a Fischer Technology Inc. FERITSCOPE
calibrated in accordance with AWS A4.2M or ISO 8249. Calibration blocks shall cover
ferrite within the range of 25% to 70%.
2.
Ferrite checks shall be undertaken on the OD on at least three locations equally
spaced around the circumference.
3.
Surface preparation shall ensure that coatings and surface oxide are removed and the
test location ground to a minimum 120 grit finish prior to the test
4.
The ferrite content shall be within the range 40 - 60% for the base material and solution
annealed weldments and 35 - 65% for the weld metal and HAZ remaining in the aswelded condition.
Detrimental phases
Microstructure examination for deleterious phases shall be carried out in accordance with
ISO 17781 section 5.2.4. For welded components, a full cross-section of the seam weld shall
be examined as well.
2.5.3
Microstructure determination of 9Cr-1Mo-V forgings and castings
Photomicrographs shall be provided for forgings to ASTM A182 Grade F91 and valve
castings to ASTM A217 Grade C12A to show the microstructure at 100X magnification
to verify a microstructure of 100% tempered martensite. Extent of testing shall be the
same as for tension tests required by the applicable ASTM standard.
2.6
TENSILE TESTING
For (super) duplex stainless steel, tensile tests shall be performed on specimens
representing each heat treatment lot (One lot is defined as a group of valves of the same wall
thickness manufactured for one heat of material and heat treatment batch). Testing shall be
carried out in accordance with ASTM A370 at room temperature. Specimens shall be taken
that represent the thickest section of the valves. Specimen shall be taken at mid wall
thickness.
For forged valves, tensile testing shall be carried out in longitudinal direction. If welds are
present, additional cross weld tensile tests shall be carried out on a test coupon.
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For cast valves, tensile testing shall be carried out in any convenient direction.
The requirements of the applicable materials standard shall be met. For cross weld tensile
tests only the ultimate tensile strength requirement will need to be met.
The tensile strength of as-supplied valve forgings to ASTM A 182 Grade F91 shall be
within the range of 90-120 ksi [620-830 MPa].
2.7
HARDNESS TESTING
Hardness measurements shall be carried out on one representative specimen per heat
treatment lot (one lot is defined as a group of valves of the same wall thickness manufactured
from one heat of material and heat treated in one batch).
If welds are present, the following applies:
1. Trajectories of 5 hardness measurements shall be carried out in accordance with
ASTM E18 at mid-wall, 1 mm (0.04 in) form the inner surface and 1 mm (0.04 in) from
the outer surface.
2. Additional Vickers HV10 cross weld hardness measurements trajectories shall be made
in accordance with ASTM A370 on a test coupon, which shall include readings of the
weld metal, fusion line and HAZ.
If welds are not present, the following applies:
1. Three hardness measurements shall be carried out in accordance with ASTM E18 at
random locations and the average value shall be taken to compare with the acceptance
criterion.
The requirements of the applicable materials standard shall be met.
2.7.1
9Cr-1Mo-V
Valve castings as per ASTM A217 Grade C12A shall have a Brinell hardness of
195- 248 HBW.
Valve forgings as per ASTM A182 grade F91 shall have a Brinell hardness of
210- 248 HBW
Brinell testing requires surface finish of 80 grit or equivalent.
The total amount of decarburized material shall not encroach on the minimum
required thickness.
Microstructural analysis shall be performed to determine decarburization and
carburization thicknesses.
One sample of each heat treatment lot shall be examined.
The thickness of the decarburized layer shall be measured at both the OD and the ID
surfaces, at 100X magnification.
The thickness of the layer at either surface shall be determined by measuring from
the exposed surface of the component to the inner boundary of the visibly carbidefree (or “white”) zone and then adding 0.25 mm (0.010 in).
The total thickness of decarburized material shall be determined as the sum of the
established thicknesses of the decarburized layer at both the OD and the ID surfaces.
Valve castings to ASTM A 217 Grade C12A shall be hardness tested in accordance with
ASTM A 217 Supplementary Requirement S13, and shall have a Brinell hardness of
195- 248 HBW.
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2.8
ELASTOMERIC SEALS
Elastomeric seals in all valve types shall be:
1.
2.
3.
4.
5.
2.9
explosive decompression resistant in pressure classes 600# and above;
< 7 mm (0.28 in) diameter for explosive decompression resistant O-rings;
fitted with groove fill of at least 85% for explosive decompression resistant O-rings;
chemically resistant to the process fluid;
qualified through SPE 85/301.
LAMINATED SEAT RINGS FOR TRIPLE OFFSET BUTTERFLY VALVES
ASTM A240 UNS S31803 laminated seat rings for triple offset butterfly valves with carbon
steel or low-temperature carbon steel, or austenitic stainless steel bodies only require testing
against detrimental phase according to (2.5.2). All other additional chemistry and testing
requirements as specified in (2.1.6), (2.2.5), (2.3), (2.4.3) and (2.5.1) only apply when (super)
duplex stainless steel bodies are specified.
3.
WELDING AND HARD FACING REQUIREMENTS
3.1
Internal valve parts of 13Cr shall not be tack welded or seal welded.
3.2
For butt-welding soft-seated valves, the Manufacturer shall advise the field welding
requirements.
3.3
All static and dynamic sealing surfaces of carbon steel or low alloy steel intended for use with
thermo plastic chevron or lip seals shall be weld-overlaid with grade 316 stainless steel, or
Alloy 625 material per SPE 77/313. For such areas, surface finish shall be Ra < 0.2 µm.
3.4
Hard facing shall comply with the following requirements:
3.4.1
Hard facing material
For tungsten carbide hard facing, hard facing material shall be 83% tungsten carbide and
17% cobalt as metallic binder.
For chromium carbide hard facing, hard facing material shall be 75% chromium, 25% nickel.
3.4.2
Hard facing deposit thickness
Sprayed deposit thickness shall be 0.25 mm (0.01 in) minimum, for finish ground minimum
thickness of 0.13 mm (0.005 in).
3.4.3
Pre-Treatment
1. Components shall be pre-machined to achieve a surface roughness of 0.8 µm Ra.
2. Total surface area of the components shall be completely degreased by immersion and
brushing in solvent degreaser.
3. Component surfaces to be sprayed shall be grit-blasted using compressed air at a
maximum supply pressure of 4 barg (60 psig), extend grit blasting 12.5 mm (0.5 in)
beyond the areas to be hard-faced for port sizes ≥ DN 50 (≥ NPS 2) and 3 mm (0.125 in)
for port sizes < DN 50 (< NPS 2).
3.4.4
Thermal Spraying
The process shall be of “High Velocity Oxygen Fuel” (HVOF) type, or equivalent process with
the same properties.
All thermal spraying shall be carried out under optimal conditions. The component shall be
coated immediately after heating and grit blasting while the component still is a temperature
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well above dew point. All seating areas of the valves shall be coated as a minimum. However,
for ball valves, the complete spherical part of the ball in contact with the seat along the full
travel shall be coated.
3.4.5
Vacuum sealing
No vacuum sealing of sprayed surfaces shall be employed.
3.4.6
Finishing
All the coated parts shall be ground and lapped. The planarity for gates and the out of
roundness for ball shall be according to the value indicated on the engineering drawing.
3.4.7
Surface finish testing
The surface on the finished components shall be tested.
Acceptance criteria: The maximum roughness value shall be Ra = 0.15 µm.
The surface sealing contact between ball or gate and seats will be integral, without any
circumferential failure or scratch.
3.4.8
Non-Destructive Examination (NDE)
All the coated surfaces shall be 100% visually examined and shall be free from pores and
cracks.
In addition, all the coated surfaces and substrate areas 12.5 mm (0.5 in) beyond coating shall
be 100% liquid penetrant examined in accordance with Article 6, ASME V. The acceptance
criteria shall be in accordance with QW 195.2, ASME IX.
3.5
Unless otherwise specified, the minimum finished thickness of the welded-on hard-facing
material shall be 1.0 mm (0.04 in).
4.
VALVES MANUFACTURED FROM BAR MATERIAL
4.1
Valves and valve parts may be manufactured from bar material, within the limits specified in
ASTM A961 and all the requirements in 4.2 to 4.6.
4.2
Where allowed by the material standard for the final product form, hollow cylindrically shaped
pressure-containing valve parts may be machined from forged, hot rolled or cold finished bar
in the heat-treated condition up to and including valve size DN 100 (NPS 4), or from seamless
tubular materials, provided that the axial length of the part is approximately parallel to the
metal flow lines of the starting stock.
4.3
Material grades for pressure-containing valve parts machined from bar shall be limited to the
following:
1.
ASTM A105 Normalised
2.
ASTM A105 Quenched and Tempered, meeting S1.1
3.
ASTM A182 Grade F 11-Class 2
4.
ASTM A182 Grade F 22-Class 3
5.
ASTM A182 Grade F 304
6.
ASTM A182 Grade F 304H
7.
ASTM A182 Grade F 316
8.
ASTM A182 Grade F 316L
9.
ASTM A182 Grade F 321
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10. ASTM A182 Grade F 321 Stabilized Heat Treated to S10
11. ASTM A182 Grade F 347
12. ASTM A182 Grade F 347 Stabilized Heat Treated to S10
13. ASTM A182 Grade F 44
14. ASTM A182 Grade F 5
15. ASTM A182 Grade F 51
16. ASTM A182 Grade F 53
17. ASTM A182 Grade F 9
18. ASTM A182 Grade F 91
19. ASTM A350 Grade LF2, Class 1
20. ASTM A350 Grade LF3
21. ASTM B462 UNS N08020 Stabilized Annealed
4.4
Valve bodies for welded-end valves and integral flanged valves from bar shall subsequently
be manufactured from:
1.
forged, hot-wrought or cold-finished round bar stock;
2.
in the heat-treated condition required by:
a.
ASTM A182, or
b.
as further specified for the ASTM A182 grade where options exist, or
c.
for ASTM A105 as follows:
d.
3.
Hot-cold forged bar as defined in ASTM A788 supplied in final heat-treated
condition as specified and certified to ASTM A105, or
ii.
Hot rolled/wrought or cold finished bar supplied in heat-treated condition as
specified and certified to ASTM A696 Grade C
or for ASTM A350 as follows:
i.
Hot-cold forged bar as defined in ASTM A788 supplied in final heat-treated
condition and certified to ASTM A350, or
ii.
Hot rolled/wrought or cold finished bar supplied in heat-treated condition and
certified to ASTM A696 Grade C
be limited to the following maximum round bar diameters:
a.
b.
4.
i.
ASTM A105 and ASTM A350:
i.
Cold finished bars of maximum diameter of 225 mm (9 in)
ii.
Hot-wrought steel bars of maximum diameter of 250 mm (10 in)
ASTM A182:
i.
Super duplex stainless steel hot or cold finished bars of maximum diameter
of 200 mm (8 in)
ii.
Duplex and other alloy hot or cold finished bars of maximum diameter of
300 mm (12 in)
and with cold finishing be restricted to turning, grinding or polishing (singly or in
combination); cold drawing or cold forming is not permitted.
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4.5
The minimum body to integral flange transition radii shall be 10 mm (0.4 in).
4.6
The extent of testing shall be as follows:
1.
ASTM A182 bars shall be tested in accordance with A276/A479 and as follows:
a.
Tensile testing is always required, while impact testing is only required where
specified in section 2.3.
b.
The mid-length of the axial tensile and impact test specimens shall be positioned
at a distance equal to the bar outside diameter or minimum of 100 mm (4 in),
whichever is the greatest, from the end of the bar, and the centreline of the
specimens shall be located at a minimum distance of OD/4 from the surface.
c.
The centreline of the tangential tensile and impact test specimens shall be located
at a minimum distance of OD/4 from the surface and the mid-point of the specimens
at a minimum of 100 mm (4 in) from the end of the bar.
d.
The notch of the impact test specimens shall be located perpendicular to the bar
surface.
e.
Bar outside diameter < 60 mm (< 2.4 in):
i.
f.
g.
2.
One tensile and set impact test specimens shall be taken in axial direction of
the bar.
Bar outside diameter 60 mm ≤ OD < 100 mm (2.4 in ≤ OD < 4 in):
i.
One tensile and set impact test specimens shall be taken in axial direction of
the bar.
ii.
In addition, one set of impact test specimens shall be taken in tangential
direction.
Bar outside diameter ≥ 100 mm (≥ 4 in):
i.
One tensile and set impact test specimens shall be taken in axial direction of
the bar.
ii.
In addition, one tensile test specimen and one set impact test specimens
shall be taken in tangential direction of the bar.
h.
Impact test acceptance criteria for forgings and bars shall comply with Section 2.3
in both directions.
i.
The specified minimum tensile strength properties of the referenced product
standard shall be fulfilled in both directions.
ASTM A105 bars shall be tested dependent on the outside diameter in accordance with
the following:
a.
The mid-length of axial tensile test specimens shall be positioned at a distance
equal to the bar outside diameter or minimum of 100 mm (4 in), whichever is the
greatest, from the end of the bar.
b.
The centreline of the axial tensile test specimen shall be located at a minimum
distance of the OD/4 position or closer to the bar centre from the surface.
c.
For bar with outside diameter < 100mm (< 4 in):
i.
d.
One tensile test specimen shall be taken in axial direction of the bar.
For bar with outside diameter ≥ 100 mm (≥ 4 in):
i.
One tensile test specimen shall be taken in axial direction of the bar.
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ii.
e.
3.
The specified minimum tensile strength properties of the referenced product
standard shall be fulfilled in both directions.
ASTM A350 bars shall be tested dependent on the outside diameter in accordance with
the following:
a.
The mid-length of the axial tensile and impact test specimens shall be positioned
at a distance equal to the bar outside diameter or minimum of 100 mm (4 in),
whichever is the greatest, from the end of the bar, and the centreline of the
specimens shall be located at a minimum distance of OD/4 from the surface.
b.
The centreline of the axial tensile test and impact test specimens shall be located
at a minimum distance of OD/4 from the surface and the mid-point of the specimens
at a minimum of 100mm (4 in) from the end of the bar.
c.
The notch of the impact test specimens shall be located perpendicular to the bar
surface.
d.
For bar with outside diameter < 60 mm (< 2.4 in):
i.
e.
f.
5.
In addition, one tensile test specimen shall be taken in tangential direction of
the bar; the centreline of the tensile test specimen shall be located a
minimum of 100 mm (4 in) from the end of the bar.
One tensile and one set of impact test specimens shall be taken.
For bar with outside diameter 60 mm ≤ OD < 100 mm (2.4 in ≤ OD < 4 in):
i.
One tensile and set of impact test specimens shall be taken in axial direction
of the bar.
ii.
In addition, one set of impact test specimens shall be taken in tangential
direction.
For bar with outside diameter ≥ 100 mm (≥ 4 in):
i.
One tensile and set of impact test specimens shall be taken in axial direction
of the bar.
ii.
In addition, one tensile test specimen and one set of impact test specimens
shall be taken in tangential direction of the bar.
g.
The specified minimum tensile strength properties of the referenced product
standard shall be fulfilled in both directions.
h.
Impact testing shall be performed at a minimum temperature of -46 ºC (-50 ºF) or
lower if specified in the ASTM standard specification for the specific grade;
acceptance criteria shall meet the requirements of Section 2.3 in both directions.
LIFTING POINTS
The Manufacturer shall ensure that the valve is capable of being lifted (e.g., provided with
lifting points, if necessary).
Valve forgings to ASTM A182 Grade F91 and valve castings to ASTM A217 Grade C12A
shall be handled without the use of attachments welded to the component.
6.
PUP PIECES
If pup pieces are specified, the following requirements shall apply unless specified otherwise:
1. Pup piece length shall be in accordance with:
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Valve Size
DN 50 to DN 200 (NPS 2 to NPS 8)
DN 250 to DN 500 (NPS 10 to NPS 20)
DN 550 (NPS 22) and above
NOTE ‘D’ being DN (NPS).
Pup Length
200 mm (8 in)
Minimum 1D or Maximum 500 mm (20 in)
800 mm (32 in)
2. The purchase order will state the outside diameter, wall thickness and material.
3. For soft-seated valves, the pup pieces shall be attached to the valve before the valve
internals are installed.
4. Transition tapers shall not be steeper than 1:4 and shall comply with ASME B31.3,
Figure 328.4.3.
5. The heat treatment batch number shall be clearly marked on the pup piece.
6. If a pup piece is to be attached to a soft-seated valve by a party other than the
Manufacturer, the manufacturer shall complete both the following:
a. advise the party welding the pup pieces on to the valve body of the maximum allowable
body temperature during welding and any subsequent post weld heat treatment;
b. approve the qualified welding procedure.
7. Unless the pipe for the pup pieces is issued by the Principal, the manufacturer may
furnish the pup pieces as forgings of equal material and grade as the valve body material
in lieu of pipe.
7.
NON-DESTRUCTIVE EXAMINATION
7.1
INSPECTION SCOPE
The quality of valves shall be such that when examined in accordance with 7.2.1 and 7.2.2,
the valves shall conform to the acceptance criteria specified in 7.2.3.
As a minimum, valves shall be subject to Non-Destructive Examination (NDE) in accordance
with their Quality Specification Level (QSL). These Quality Specification Levels are
determined on the basis of pressure class, material, valve size and service.
Based on the information provided in the MESC Buying Description, purchase order or
requisition sheet, the Manufacturer shall determine the appropriate Quality Specification
Level (QSL-1, QSL-2, QSL-3, or QSL-4) for each valve, by applying the decision tree given
in Figure 1. The extent of NDE per Quality Specification Level shall be in accordance with
Table 1.
In case the MESC Buying Description specifies both QSL-3 and either QSL-1 or QSL-2:
1.
QSL-1 or QSL-2: NDE as per Quality Specification Level in accordance with Table
1 shall apply for forged and plate pressure containing parts.
2.
QSL-3: NDE as per Quality Specification Level in accordance with Table 1 shall
apply for cast pressure containing parts.
Regardless of the sampling specified in section 7.2.4, a prototype casting shall be fully
inspected and tested by the manufacturer in accordance with the following examinations:
1.
Visual examination
MESC SPE 77/302
February 2022
Page 24
2.
RT or UT of critical areas (Critical sections of pressure containing parts (body and
bonnet / cover) as determined by radiographic examination requirements for special
class valves as defined by ASME B16.34) of pressure containing parts
3.
MP or LP of entire surface of pressure containing parts. Liquid Penetrant
examination shall be considered on non-magnetic materials.
The above-mentioned examinations shall be executed in accordance with 7.2.
7.2
EXECUTION
7.2.1
Methods
The following requirements shall apply:
1.
Visual examination
Visual examination shall be conducted on the entire, visible, internal and external surface
area of the valve components.
Examination shall be carried out in accordance with ASME Section V, Article 9.
2.
Penetrant testing (LP)
Examination shall be carried out in accordance with ASME Boiler and Pressure Vessel
Code, Section V, Article 6. For stainless steel and CRA valves, LP examination shall be
performed only after thorough cleaning as per ASTM E165, A1.1.1.8.
3.
Magnetic-particle testing (MP)
Examination shall be carried out in accordance with ASME Boiler and Pressure Vessel
Code, Section V, Article 7.
4.
Radiographic testing (RT) of castings
Examination shall be carried out in accordance with ASME B16.34, Appendix-I.
5.
Radiographic testing (RT) of welds
Examination shall be carried out in accordance with ASME Boiler and Pressure Vessel
Code, Section V, Article 2.
6.
Ultrasonic testing (UT) of plate
Examination shall be carried out in accordance with ASTM A388, ASTM A435 or
ASTM A577, as applicable.
7.
Ultrasonic testing (UT) of castings
Examination shall be carried out in accordance with ASME B16.34, Appendix-IV.
8.
Ultrasonic testing (UT) of welds
Examination shall be carried out in accordance with ASME Boiler and Pressure Vessel
Code, Section V, Article 4.
9.
Ferrite Number (FN) testing
Examination shall be carried out in accordance with ISO 8249 or AWS A4.2M.
Alternative methods are subject of approval by the Principal.
10. Hardness testing
Examination shall be carried out in accordance with ASTM E110.
11. All other examinations shall be carried out in accordance with ASME B16.34.
7.2.2
Execution
The following requirements shall apply:
1.
Unless specified otherwise, NDE shall be carried out after completion of heat treatment.
MESC SPE 77/302
February 2022
Page 25
2.
Visual examination shall be conducted on the entire, visible, internal and external surface
area of the valve components.
3.
Magnetic Particle (MP) and Liquid Penetrant (LP) examinations shall be carried out on
surfaces in their finished form and prior to application of coating on accessible internal
and external surfaces to the extent as specified in Table 1. The yoke method shall be
used (if possible), but permanent magnets are prohibited.
4.
NDE personnel shall be qualified in accordance with the requirements specified in
ASNT SNT-TC-1A, ISO 9712 or EN 473 Level II as a minimum. Other qualifications are
subject of approval by the Principal.
5.
Personnel performing visual inspections of welding operations and completed welds
shall be qualified and certified by one of the following:
6.
a.
Welding Inspectors qualified through the American Welding Society shall, as a
minimum, be certified as a Welding Inspector or Associate Welding Inspector.
b.
Welding Inspectors qualified through the International Institute of Welding shall, as
a minimum, be certified as an International Welding Practitioner.
c.
Welding Inspectors qualified through The Welding Institute shall, as a minimum, be
certified as a Welding Inspector 3.0.
Hardness testing shall be executed as follows:
a.
At least 1 reading per weld for valves  DN 100 ( NPS 4).
b.
At least 2 readings per weld for valves 150  DN  300 (6  NPS  12).
c.
At least 1 reading every 400 mm (16 in) of weld length for valves > DN 300
(> NPS 12).
Hardness testing applies to pressure retaining welds (i.e., attachment of flanges to the
valve body, body-to-bonnet or body-to-cover connection) and hard-facing weld overlays
only.
7.2.3
Acceptance criteria
The following requirements shall apply:
1.
Unless specified otherwise, acceptance criteria for NDE methods shall be in accordance
with ASME B16.34.
2.
Penetrant testing (LP)
Acceptance shall be in accordance with ASME Boiler and Pressure Vessel Code,
Section VIII, Division 1, Appendix 8, except:
3.
a.
for castings and non-machined overlay relevant indications (rounded and linear) of
less than 5 mm are acceptable;
b.
for machined overlay there shall be no indications in the seal areas
Magnetic-particle testing (MP)
Acceptance shall be in accordance with ASME Boiler and Pressure Vessel Code,
Section VIII, Division 1, Appendix 6, except:
a. for castings relevant indications (rounded and linear) of less than 5 mm are
acceptable.
4.
Radiographic testing (RT) of castings
Acceptance shall be in accordance with ASME B16.34, Appendix-I.
5.
Radiographic testing (RT) of welds
MESC SPE 77/302
February 2022
Page 26
a.
For linear indications, acceptance shall be in accordance with ASME Boiler and
Pressure Vessel Code, Section VIII, Division 1, UW-51;
b.
For rounded indications, acceptance shall be in accordance with ASME Boiler and
Pressure Vessel Code, Section VIII, Division 1, Appendix 4.
6.
Ultrasonic testing (UT) of plate
Acceptance shall be in accordance with ASTM A388, ASTM A435 or ASTM A577, as
applicable.
7.
Ultrasonic testing (UT) of castings
Acceptance shall be in accordance with ASME B16.34-2004, Appendix-IV.
8.
Ultrasonic testing (UT) of welds
Acceptance shall be in accordance with ASME Boiler and Pressure Vessel Code,
Section VIII, Division 1, Appendix 12.
9.
Visual examination
The acceptance criteria for visual examination of forgings shall be in accordance with
the applicable ASTM standard, while the acceptance criteria for visual examination of
castings shall be in accordance with MSS SP-55 as follows:
a.
Type 1: none acceptable;
b.
Type 2 to 12: A and B only.
10. Hardness testing
Unless specified otherwise, hardness testing shall have the following acceptance
criteria:
a.
The hardness of base metal, welds and Heat Affected Zones (HAZ) of pressure
containing parts (body, bonnet or cover) manufactured of carbon steel shall not
exceed 248 HV10.
b.
The hardness of base metal of internals with weld deposits shall not exceed
400 HV10.
c.
The hardness of Stellite 6 weld overlay shall be in the range of 330 HV10 to
450 HV10.
d.
The hardness of 13Cr internals shall not exceed 400 HV10.
e.
The hardness indentations shall be avoided on any sealing or sliding surfaces.
11. Ferrite Number testing
The Ferrite Number of the deposited weld metal of all austenitic stainless steel welds
shall be in the range of 3 FN to 8 FN.
12. CRA weld overlay materials
Acceptance criteria for corrosion resistant weld overlay materials shall be in accordance
with MESC SPE 77/313.
7.2.4
Sample strategy and lot acceptance
Unless specified otherwise, the lot for each inspection campaign, from which the test samples
are drawn, is defined as all valves part of the same purchase order and purchased from a
single manufacturing location.
Based on the decision tree of Figure 1, the lot shall be divided into sub-lots per Quality
Specification Level (QSL). Table 1 then gives the percentage of NDE per Quality
Specification Level and thus per sub-lot.
MESC SPE 77/302
February 2022
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In case the percentage of the lot to be inspected is < 100 %, the sample size shall be roundedup to the next whole number. In that case samples shall be drawn from the sub-lot of valves
at random. However, if that sub-lot consists of various sizes, pressure classes, then sampling
shall be applied in such a way that it covers the entire production range from that lot. In
addition, in case the sub-lot is manufactured from different heats, at least 1 valve per heat
shall be examined.
In the event that any of the examinations do not meet the acceptance criteria, the failed
valve(s) shall be repaired, tested and re-examined by the same method and the reexamination shall include additional valves from the same sub-lot. The sampling plan and
procedure for the re-examination shall follow ISO 2859/2:1985, Procedure A, Limiting Quality
32% (Table A).
If the number of nonconforming valves found in the sample is greater than the acceptance
number (AC), the lot is unacceptable. In that case all valves in the sub-lot shall be reexamined.
Notwithstanding that the lot is accepted, any nonconforming valves found during
examination, whether forming part of the sample or not, shall be repaired, tested and reexamined.
The entire lot shall be accepted if all samples meet the requirements.
7.3
DEFECT REMOVAL AND WELD REPAIR
Unless specified otherwise, defect removal and repair shall be in accordance with ASME
B16.34, Section 8.4.
Austenitic stainless steel, (super) duplex or nickel alloy valves may be repaired by welding,
in which case a further solution heat treatment shall be performed after the repair in
accordance with ASTM A743 (unless not required in 2.1.5), ASTM A995, or ASTM A494.
Repair welding of (super) duplex valves is only allowed if specifically approved by the
principal.
After repair to ASTM A217 Grade C12A by welding, the casting shall be renormalized
and tempered and all weld repairs to the casting shall be recorded. Repairs by welding
shall not be permitted for valve forgings to ASTM A182 Grade F91.
MESC SPE 77/302
February 2022
Page 28
Figure 1: Decision tree for selecting the appropriate Quality Specification Level.
MESC SPE 77/302
February 2022
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NDE Requirements
1
1
Visual examination
2
UT of entire surface of plate for
valves fabricated by welding
RT or UT of critical areas of
pressure containing parts2
3
Table 1 – Extent of NDE on valves
Forgings
Castings
QSL QSL QSL QSL
QSL QSL QSL QSL
1
2
4
1
2
3
4
1
Percentage of the lot to be inspected
100
100
100
100
100
100
100
100
Plate
QSL
2
QSL
4
100
100
N/A
N/A
N/A
N/A
N/A
N/A
N/A
-
-
100
-
-
-
-
5
5
100
-
-
-
4
RT or UT of full penetration welds
for valves fabricated by welding
N/A
N/A
N/A
N/A
N/A
N/A
N/A
5
5
100
5
RT or UT of bonnet-to-body welds
and welded on flanged ends and
pup-pieces6
5
5
100
5
5
100
100
N/A
N/A
N/A
6
LP of entire internally cladded weld
overlay surface7
100
100
100
100
100
100
100
100
100
100
7
MP or LP of entire surface of
pressure containing parts3,7
-
-
100
-
5
5
100
-
-
-
8
MP or LP of machined surfaces of
pressure containing parts, seats,
stem (a stem that is penetrating the
pressure boundary is subject to
testing) and obturator3
-
-
100
-
5
5
100
-
-
100
9
MP or LP of the surface of buttwelding ends3
-
5
100
-
5
100
100
-
5
100
10
MP or LP of full penetration, fillet
and/or attachment welds for valves
fabricated by welding3,7
N/A
N/A
N/A
N/A
N/A
N/A
N/A
-
5
100
11
MP or LP of bonnet-to-body
welds3,7
-
5
100
-
5
100
100
-
-
-
12
Ferrite Number (FN) of weld metal
for pressure retaining welds4
X
X
X
X
X
X
X
X
X
X
13
Hardness of weld metal for
pressure retaining welds5
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
1
RT = Radiography; UT = Ultrasonic; MP = Magnetic Particle; LP = Liquid Penetrant
2
Critical sections of pressure containing parts (body and bonnet / cover) as determined by radiographic examination
requirements for special class valves as defined by ASME B16.34.
3
Liquid Penetrant on non-magnetic materials.
4
X = 100 % for austenitic stainless steel with a maximum design temperature > 450 °C (> 842 °F) and/or a minimum
design temperature < minus 101 °C (< minus 150 °F).
X = 5 % for other austenitic stainless steel.
5
Y = 100 % for valves, as specified as for Severe Cyclic Service.
Y = 5 % for valves made of carbon steel, C-Mn or Cr-Mo steels in ASME Class 1500 and higher.
Y = 5 % for valves made of carbon steel, C-Mn or Cr-Mo steels in  ASME Class 900 and for either of the following
services: hydrogen, hydrofluoric acid (HF), sour, caustic soda, sulfuric acid, chlorine or for valves with a minimum
design temperature < minus 29 °C (< minus 20 °F).
Y = 5 % for valves made for sour service or in case the material specification covers any hardness restriction.
Y = For (super) duplex stainless steel, see section 2.7
6
For welded bonnet gate and globe check valves, DN 50 (NPS 2) and smaller (designed to API 600, API 602,
ISO15761) 100% MP or LP examination.
7
For stainless steel and CRA valves, etching shall be performed (see ASTM E165, Annex A1.1.1.8)
MESC SPE 77/302
February 2022
Page 30
8.
DOCUMENTATION
The manufacturer shall provide General Arrangement/Cross-sectional assembly drawings
with parts list and materials list to the principal during submission of quotation for bid
evaluation review.
If specified by the Principal, the Manufacturer shall provide documentation prior to shipment.
Computerized data or photocopies of originals, which are verified and signed by the QA/QC
department, may be provided instead of originals.
All documentation shall be in English or accompanied by a certified translation in English.
Unless specified otherwise, all documentation shall be stored for at least 10 years and shall
include the following:
1. Purchase order and identification of valves by serial number or Manufacturer’s code.
2. Material test reports and inspection certificates, traceable by heat number to the foundry
or mill.
3. NDE reports, including sketches, if necessary, showing the locations of examination,
traceable by heat or serial number. The retention period for NDE reports shall be 5 years.
The retention period for radiographs shall be at least 12 months.
4. For (super) duplex stainless steel parts,
a. heat treatment charts and records shall be provided.
b. Metallurgical and corrosion test results
c.
Minimum lateral expansion value from Charpy impact test
5. Listing of applicable and authorised concessions, waivers and/or material substitutions.
6. Listing of applicable manuals (e.g., assembly or maintenance manuals).
7. For 9Cr-1Mo-V parts: All test results required in this specification shall be
included in the MTRs.
9.
MATERIAL CONTROL, VERIFICATION AND CERTIFICATION
9.1
POSITIVE MATERIAL IDENTIFICATION (PMI)
9.1.1
Carbon steel valves in Hydrofluoric Acid (HF) service with restricted carbon content and
residual element requirements shall be subject to 100% PMI for body and bonnet
components, for the chemical elements indicated in table 2.
9.1.2
Unless specified by Principal, PMI is not required for other services where marking is clearly
legible on both cast and forged body and bonnet components and the marking is executed
in high relief (stamping or embossed is not considered as high relief) as an integral part of
the component and the marking is not obscured by painting or coating.
9.1.3
Where material identification does not comply with 9.1.2, or is otherwise not clearly legible
on the body and bonnet components, 100% PMI shall be performed on all body and bonnet
components for the chemical elements indicated in table 2.
Table – 2 - ALLOYING ELEMENTS REQUIRED FOR PMI
MESC SPE 77/302
February 2022
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Chemical element (3)
Alloy
C
Cr
Ni
Mo
Nb
Ti
Cu
Co
Al
Zn
Sn
Pd
V
1Cr–1/2Mo
X
X
1-1/4Cr–1/2Mo
X
X
2-1/4Cr–1Mo
X
X
2-1/4Cr–1Mo–
1/4V
X
X
5Cr–1/2Mo
X
X
9Cr –1Mo
X
X
X
9Cr-1Mo
modified
X
X
X
317 (1)
X
X
321 (1)
X
X
347 (1)
X
X
Duplex (1)
X
X
X
Super Duplex (1)
X
X
X
SMO 254
X
X
X
CD4MCu
X
X
X
Alloy 20 (1)
X
X
X
6 Mo Alloys (1)
X
X
X
Alloy C-276
X
X
X
Alloy 400 (3)
X
X
X
X
X
X
X
Alloy 600
X
X
Alloy 625
X
X
Alloy 800
X
X
Alloy 825
X
X
X
X
X
X
X
X
X
X
X
90/10 CuNi
X
X
70/30 CuNi
X
X
317L (1, 4)
X
X
X
321H (1)
X
X
X
347H (1)
X
X
X
X
X
X
Titanium Gr 2
X
Titanium Gr 7
X
Titanium Gr 12
X
Titanium Gr 16
X
Admiralty brass
X
X
X
X
MESC SPE 77/302
February 2022
Page 32
Chemical element (3)
Alloy
C
Cr
Ni
Mo
Nb
Ti
Cu
Naval brass
X
Co
Al
Zn
Sn
X
X
Pd
V
Weld Overlayed
Surfaces(to
match specified
chemistry)
CS in HFA
Service (2)
X
NOTES: 1.
X
X
All welds in this metallurgy shall have the ferrite controlled to the value specified in the associated
welding DEP (DEP 30.10.60.18-Gen. or DEP 30,10.60.32-Gen. ).
a.
2.
Ferrite shall be tested to the same level as the base material unless a specific sample
size / testing rate is given in the welding DEP.
Carbon steel in HF acid service shall meet the following criteria: Cu + Ni < 0.15 wt% and
C > 0.18 wt%.
a.
9.1.4
X
Where the minimum required carbon is not met, the formula shall include chromium:
Cu + Ni + Cr < 0.15 wt%.
3.
Alloy 400 weld consumables shall contain Ti < 2.2 %wt. and Fe < 5 %wt. in Hydrofluoric acid
service.
4.
The weld analysis shall meet the same composition limits as the corresponding base plate, and
clad materials except that carbon maximum of 0.045 % is acceptable in a deposit joining L grade
austenitic stainless steel cladding.
PMI shall be performed using either:
1.
X-ray Tube Equipment (Handheld Analyser)
2.
X-Ray Florescence Equipment (Handheld Analyser)
3.
Optical Emission Spectrometers (Arc/Spark)
9.2
CERTIFICATION
9.2.1
The Manufacturer shall provide the following certificates:
1.
All pressure containing parts (viz., body, bonnet and cover), as well as closure member,
seat rings (if applicable), stem and bellows (if applicable) shall have an inspection
certificate in accordance with ISO 10474 type 3.1 or EN 10204 type 3.1.
2.
All non-metallic materials shall have a certificate of compliance in accordance with
ISO 10474 type 2.1 or EN 10204 type 2.1.
3.
All testing and examination shall have an inspection certificate in accordance with
ISO 10474 type 3.1 or EN 10204 type 3.1.
4.
The PMI certificate shall include the following:
a. Manufacturer/Fabricator's name.
b. Date(s) of testing.
c.
Name of person and company performing the test and the qualifications of PMI
technician.
MESC SPE 77/302
February 2022
Page 33
d. Material Manufacturer, MTR number, heat number and lot number, as applicable.
e. Type of analyser and alloy analyser calibration records and results.
f.
Chemical elements verified by PMI and the percentage of the elements in
accordance with table 2.
g. Reports downloaded from the alloy analyser are acceptable.
5.
10.
The finished valve shall have an inspection certificate in accordance with
ISO 10474 type 2.1 or EN 10204 type 2.1, demonstrating that it complies with all
requirements.
WITNESSING BY THE PRINCIPAL
The Principal shall specify if, and to what extent, he or his designated representative will
witness the Manufacturer’s inspections and tests and/or will perform a document review
before shipment.
11.
VALVES SUPPLIED TO EUROPEAN SITES
If the valve is supplied to an end user in the European Economic Area, the following
requirements shall apply:
12.
1.
All valves shall meet the requirements of the Pressure Equipment Directive
(PED) 2014/68/EU.
2.
Low temperature carbon steels valves shall be impact tested at a temperature of
minus 50 °C (minus 58 °F). The absorbed energy, as given in the steel certificate, shall
exceed 27J for standard size specimens (10 mm x 10 mm). Alternatively, the impact
tests may be carried out at minus 46 °C (minus 50 °F) but the impact values shall be at
least 33J for standard size specimens.
3.
Steel valves > DN 25 (> NPS 1) shall be subject to conformity assessment procedures
applicable to Category III requirements and certified accordingly.
4.
Safety accessories defined in the Pressure Equipment Directive (PED) 2014/68/EU,
Article 1, Section 2.1.3, and referred to in Article 3, Section 1.4, (such as but not limited
to safety valves, emergency shut down and depressuring valves including valve actuator
assemblies), shall be classified in category IV.
5.
The inspection certificates shall be in accordance with EN 10204.
6.
Materials shall comply with the requirements of Para 4, Annex 1, 2014/68/EU.
7.
If specified, valves shall meet the relevant requirements of the Potentially Explosive
Atmospheres Directive (ATEX) 2014/34/EU.
DESIGN VALIDATION TESTING FOR VALVES
Valve design shall be validated through design validation test in accordance with MESC SPE
77/300.
13.
VALVES SUPPLIED TO OFFSHORE SITES
For valves operating on offshore topsides structures, coating in accordance with System V1,
as specified in SPE 77/310 shall be applied on carbon steel handwheels, gearboxes and
stem extensions on valves where body material (Mat, body) is defined as “duplex stainless
steel”, “super-duplex stainless steel”, or “6Mo”.
MESC SPE 77/302
February 2022
Page 34
PART III REFERENCES
In this MESC SPE, reference is made to the following publications:
NOTES:
1. Unless specifically designated by date, the latest edition of each publication shall be used, together with any
amendments/supplements/revisions thereto.
2. Most of the referenced external standards are available to Shell staff on the SWW (Shell Wide Web) at
http://sww05.europe.shell.com/standards.
SHELL STANDARDS
Procedure and Technical Specification for Design Validation
Testing (DVT) of Industrial Valves
MESC SPE 77/300
Valves with corrosion resistant alloy (CRA) weld overlay
cladding
MESC SPE 77/313
AMERICAN STANDARDS
Materials and Fabrication Requirements for 2-1/4Cr-1Mo
and 3Cr-1Mo Steel Heavy Wall Pressure Vessels for High
Temperature, High Pressure Hydrogen Service
API RP 934 (1st edition)
Issued by:
American Petroleum Institute
Publications and Distribution Section
1220 L Street Northwest
Washington DC 20005
USA
Valves – Flanged, threaded, and welding end
ASME B16.34
Process Piping
ASME B31.3
ASME Boiler and Pressure Vessel Code:
Section V - Non destructive examination
ASME V
Section VIII - Pressure vessels – Division 1 – Rules
for construction of pressure vessels
ASME VIII Div. 1
Section IX - Qualification standard for welding and
brazing procedures, welders, brazers, and welding
and brazing operators
ASME IX
Issued by:
American Society of Mechanical Engineers
ASME International
Three Park Avenue, M/S 10E
New York, NY 10016
USA
Recommended Practice No. SNT-TC-1A
ASNT SNT-TC-1A
Issued by:
American Society for Nondestructive Testing
PO Box 28518
1711 Arlingate Lane
Columbus, OH 43228-0518
USA
Standard Specification for Carbon Steel Forgings for
Piping Applications
ASTM A105
MESC SPE 77/302
February 2022
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Standard Specification for Forged or Rolled Alloy and
Stainless Steel Pipe Flanges, Forged Fittings, and Valves
and Parts for High-Temperature Service
ASTM A182
Standard Specification for Carbon Steel, Alloy Steel, and
Stainless Steel Nuts for Bolts for High Pressure or High
Temperature Service, or Both
ASTM A194
Standard Specification for Steel Castings, Carbon,
Suitable for Fusion Welding, for High-Temperature
Service
ASTM A216
Steel castings, martensitic stainless and alloy, for
pressure containing parts, suitable for high temperature
service
ASTM A217
Standard Specification for Chromium and ChromiumNickel Stainless Steel Plate, Sheet, and Strip for Pressure
Vessels and for General Applications
ASTM A240
Standard Practices for Detecting Susceptibility to
Intergranular Attack in Austenitic Stainless Steels
ASTM A262
Standard Specification for Carbon and Low-Alloy Steel
Forgings, Requiring Notch Toughness Testing for Piping
Components
ASTM A350
Specification for steel castings, austenitic, austeniticferritic (Duplex) for pressure containing parts
ASTM A351
Standard Specification for Steel Castings, Ferritic and
Martensitic, for Pressure-Containing Parts, Suitable for
Low-Temperature Service
ASTM A352
Standard Test Methods and Definitions for Mechanical
Testing of Steel Products
ASTM A370
Standard Practice for Ultrasonic Examination of Steel
Forgings
ASTM A388
Standard Specification for Straight-Beam Ultrasonic
Examination of Steel Plates
ASTM A435
Standard Specification for Stainless Steel Bars and
Shapes for Use in Boilers and Other Pressure Vessels
ASTM A479
Standard Specification for Steel Castings Suitable for
Pressure Service
ASTM A487
Standard Specification for Castings, Nickel and Nickel
Alloy
ASTM A494
Standard Specification for Hot-Rolled and Cold-Finished
Age-Hardening Stainless Steel Bars and Shapes
ASTM A564
Standard Specification for Ultrasonic Angle-Beam
Examination of Steel Plates
ASTM 577
Standard Specification for Steel Bars, Carbon, HotWrought or Cold-Finished, Special Quality, for Pressure
Piping Components
ASTM A696
MESC SPE 77/302
February 2022
Page 36
Standard Specification for Castings, Iron-Chromium, IronChromium-Nickel, Corrosion Resistant, for General
Application
ASTM A743
Standard specification for castings, iron-chromium-nickel,
corrosion resistant for severe service
ASTM A744
Standard Specification for Steel Forgings, General
Requirements
ASTM A788
Specification for castings, iron-chromium-nickelmolybdenum corrosion resistant, Duplex (austeniticferritic) for general application
ASTM A890
Standard Specification for Common Requirements for
Steel Flanges, Forged Fittings, Valves, and Parts for
Piping Applications
ASTM A961
Standard Specification for Castings, Austenitic-Ferritic
(Duplex) Stainless Steel, for Pressure-Containing Parts
ASTM A995
Standard Specification for Forged or Rolled UNS N06030,
UNS N06022, UNS N06035, UNS N06200, UNS N06059,
UNS N10362, UNS N06686, UNS N08020, UNS N08367,
UNS N10276, UNS N10665, UNS N10675, UNS N10629,
UNS N08031, UNS N06045, UNS N06025, UNS R20033
Alloy Pipe Flanges, Forged Fittings, and Valves and Parts
for Corrosive High-Temperature Service
ASTM B462
Standard Specification for Low-Carbon Nickel-ChromiumMolybdenum, Low-Carbon Nickel-MolybdenumChromium, Low-Carbon Nickel-Molybdenum-ChromiumTantalum, Low-Carbon Nickel-Chromium-MolybdenumCopper, and Low-Carbon Nickel-Chromium-MolybdenumTungsten Alloy Rod
ASTM B574
Standard Test Methods for Rockwell Hardness of Metallic
Materials
ASTM E18
Standard Test Method for Indentation Hardness of
Metallic Materials by Portable Hardness Testers
ASTM E110
Standard Practice for Liquid Penetrant Examination for
General Industry
ASTM E165
Standard Test Methods of Detecting Susceptibility to
Intergranular Corrosion in Wrought, Nickel-Rich,
Chromium-Bearing Alloys
ASTM G28
Issued by:
American Society for Testing and Materials
100 Barr Harbor Drive, West Conshohocken
PA 19428-2959
USA
Standard Procedures for Calibrating Magnetic
Instruments to Measure the Delta Ferrite Content of
Austenitic and Duplex Ferritic-Austenitic Stainless Steel
Weld Metal
AWS A4.2M
MESC SPE 77/302
February 2022
Page 37
Issued by:
AWS - American Welding Society
8669 NW 36 Street, # 130 Miami
FL 33166-6672
USA
Quality Standard for Steel Castings and Forgings
for Valves, Flanges, and Fittings and Other Piping
Components Radiographic Examination Method
MSS SP-54
Quality standard (visual method) for steel castings for
valves, flanges and fittings and piping
MSS SP-55
Quality Standard for Ferritic and Martensitic Steel
Castings for Valves, Flanges, Fittings, and Other Piping
Components Ultrasonic Examination Method
MSS SP-94
Issued by:
Manufacturers Standardisation Society
of the Valve and Fittings Industry
127 Park Street, N.E.,
Vienna, VA, 22180-4602
USA
EUROPEAN STANDARDS
Non-Destructive Testing – Qualification and Certification
of NDT Personnel – General Principles
EN 473
Metallic products – Types of inspection documents
EN 10204
Issued by:
Commité Européen de Normalisation
Secrétariat Central
Rue de Stassart 36
B-1050 Brussels
Belgium
Copies can also be obtained from national standards
organizations.
Directive of the European Parliament and of the Council on the
Approximation of the Laws of the Member States Concerning
Pressure Equipment
2014/68/EU
NOTE: Commonly known as the European Pressure Equipment
Directive(PED)
Directive of the European Parliament and of the Council on the
harmonisation of the laws of the Member States relating to
equipment and protective systems intended for use in
potentially explosive atmospheres (recast)
NOTE: Commonly known as the Explosive Atmospheres Directives
(ATEX)
Issued by:
EU/EC - European Union/Commission Legislative Documents
175 Rue De La Loire
Brussels, Belgium
INTERNATIONAL STANDARDS
2014/34/EU
MESC SPE 77/302
February 2022
Page 38
Sampling procedures for inspection by attributes - Part 2:
Sampling plans indexed by limiting quality (La) for
isolated lot inspection
ISO 2859/2:1985
Sampling procedures for inspection by variables – Part 1
to 5
ISO 3951- 1/5
Welding - Determination of Ferrite Number (FN) in
Austenitic and Duplex Ferritic-Austenitic Cr-Ni Stainless
Steel Weld Metals – Second Edition
ISO 8249
Non-destructive testing — Qualification and certification of
personnel
ISO 9712
Steel and Steel Products – Inspection Documents
ISO 10474
Guidelines for implementation of statistical process
control (SPC) – Part 1 and 2
ISO 11462-1/2
Steel gate, globe and check valves for sizes DN 100 and
smaller, for the petroleum and natural gas industries
ISO 15761
Petroleum, petrochemical and natural gas industries —
Test methods for quality control of microstructure of
ferritic/austenitic (duplex) stainless steels
ISO 17781:2017
Issued by:
ISO Central Secretariat
1, ch. de la Voie-Creuse
Case postale 56
CH-1211 Genève 20
Switzerland
Copies can also be obtained from national standards
organizations.
MESC SPE 77/302
February 2022
Page 39
Petroleum and Natural Gas Industries – Pipeline
Transportation Systems – Subsea Pipeline Valves
ISO 14723
Petroleum and natural gas industries — Materials for use
in H2S-containing environments in oil and gas production
— Part 3: Cracking-resistant CRAs (corrosion resistant
alloys) and other alloys
ISO 15156-3
Issued by:
ISO Central Secretariat
1, ch. de la Voie-Creuse
Case postale 56
CH-1211 Genève 20
Switzerland
Copies can also be obtained from national standards organizations.