General information Product limitations
7
Typical 'Pressure / temperature limits' diagram and table for a safety valve:
Pressure / temperature limits Please contact: Spirax Sarco, when so required, for relevant details regarding the maximum allowable limits that the body can withstand.
A
Steam saturation curve
C
B
Pressure bar g
The product must not be used in this region.
A - B Flanged PN25. A - C Flanged ANSI 150.
Note: For hygienic / sanitary clamp ends the maximum pressure / temperature may be restricted by the gasket or sanitary clamp used. Please consult Spirax Sarco.
Body design conditions
PN25
DN15 - DN32
18 bar g
Maximum
Set pressure range
DN40 - DN50
14 bar g
Minimum
0.3 bar g
Minimum
-90 °C
Metal seat
Maximum
+300 °C
Minimum
-30 °C
Nitrile seat
Maximum
+120 °C
Temperature
7.4 12
Minimum
-50 °C
EPDM seat
Maximum
+150 °C
Minimum
-20 °C
Viton seat
Maximum
+200 °C
Steam
5%
Overpressure
Gas, liquid
10%
Performance data
Blowdown limits Steam, gas, liquid
10%
Derated coefficient of discharge values
Steam, gas
0.71
For further 'Pressure / temperature limits' diagram and table layouts, see TI-S24-41, pages 4 and 5.
Liquid 0.52 Designed for a maximum inlet cold hydraulic test pressure of 37.5 bar g Note: If a test gag is fitted, test pressure must not exceed 25 bar g
TI-S13-50 CH Issue 3
Pressure / Temperature Limits for Safety Valves
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