44
Control systems Safety valves
Pressure / temperature limits
A
B
Steam saturation curve
Pressure psi g
The product must not be used in this region. A - B To avoid spring damage, do not exceed an operating temperature of 446 °F.
Body design conditions
ASME 300
Maximum
300 psi g
Set pressure range
Minimum
5 psi g
Maximum
750 °F
Design temperature
Minimum
-20 °F
4.7 106
Operating temperature
Maximum
446 °F
ASME I
Steam
3%
Overpressure
Steam
10%
ASME VIII
Air/gas
10%
ASME I
Steam
2 - 6%
Performance data
Blowdown limits
Steam
7%
ASME VIII
Air/gas
7%
Steam
0.955
Derated coefficient of discharge values
Air/gas
0.955
Maximum permitted backpressure up to:
10% of set pressure
Tested at a maximum inlet cold hydraulic test pressure of:
1015 psi g
TI-S13-30 CTLS Issue 16
Page 2 of 9
SV74 Carbon Steel Safety Valve
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