Calculation & Valve Data Sheet
Safety Relief Valve
API Recommended Practice 520 Part 1, 10th Edition Oct 2020
W
A

C .K d .P1.K b.K c
T .Z
M
A
Glocom
Critical Gas Equation
Customer Ref:
17.9  W
Z .T
A

F 2.Kd .Kc
M .P1( P1 - P 2)
11.78  Q
A

Kd .Kb. Kc. Kv
Customer Name:
Sub-critical Gas Equation
Broady Ref:
G
P1 - P 2
Liquid Equation
190.5  W
P1.Kd .Kb.Kc. Kn. Ksh
Q-143341
Date
Data Sheet Rev
Sales Engineer
08 August 2022
Steam Equation
WM
Tag or Item Number
51PSV-1501A/B
Safety Valve Data Sheet
Sizing Case
Safety Valve Type & Code Conventional
Fluid Name
Gas
84.000
0.000
2.000
2.000
Fluid State (Gas or Liquid)
Set Pressure, Ps
Constant Back Pressure, Pc
Variable Back Pressure, Pv
Total Back Pressure, Pb
API 520
Inlet Size
Inlet Finish
Barg
Outlet Size
Barg
Outlet Finish
1
in
ANSI #600
2
in
ANSI #150
RF
RF
Barg
Body Carbon Steel - ASME SA216 WCB
Barg
Bonnet Carbon Steel - ASME SA216 WCB
21.00
7747
21.29
1.172
0.790
160.00
Over Pressure
Flow rate
Molecular Weight
Ratio of specific heat, Cp/Cv
Compressibility, z
Relief Temperature
Screwed Cap Carbon Steel - ASME SA216 WCB
%
Nozzle Type 316SS + Stelliting
kg/hr
Disc Type 316SS + Stelliting
kg/kmol
Guide Flange Type 316SS
Spindle Type 316SS
Spring Type 316SS
C
Psig/F
84.00
100.00
Yes
Design Pressure
Design Temperature (Max)
Critical Flow ?
Barg
1218
C
212
Fasteners CS-ASME SA193 Grd B7M/SA194 Grd 2HM
Accessories Test Gag
Bara
Relieving Pressure
Back Pressure
Pcf =
Gas Constant
Co-efficient of Discharge, Kd
Back Pressure Correction Factor, Kb
Bursting Disc Correction Factor, Kc
10265.30
301.30
5850.984
0.02539
0.975
1.00
1.000
kPaa
102.65
kPaa
3.013
85.68
Orifice Area Calculation per API 520
Or
Selected Orifice Area
API 526 Orifice Designation
Maximum Discharge Capacity
SPL per API 521 5.8.10.3 in (dB)
Reaction Force API 520 Pt 2 5.8.2.1 (Kgf)
0.1894
122.21
0.196
E
8621.43
110.3
146.0
PTFE Joints
kPaa
Valve Series 3500
Model Number
Barg
Spring Cold Set Pressure
Notes
Barg
in
in
Dimensional Information
85.68
2
mm
3551E-CN-001A1
2
2
kg/hr
mm/kg
A
115
B
104
C
389
Mass
15
The flanges are designed for
open discharge
the standard grade of nuts &
open discharge
bolts.(Not heavy duty.)
Please check with Broady's before using dimensions for pipe work/design
© Broady Flow Control Limited 2006 - 2022
QF223.1 ISS R : 20/06/2022