The maximum working pressure of an ASA Class 150 flange (equivalent to ASME B16.5 Class 150) is highly dependent on the material and the operating temperature. The "150" designation is a class number, not a direct pressure value in PSI or bar across all conditions.
The following values are based on non-shock pressure and temperature ratings per the ASME B16.5 standard:
Temperature Range (°C)
Carbon Steel (e.g., ASTM A105) Max Pressure
Stainless Steel (e.g., ASTM A182 F304/F316) Max Pressure
-29°C to 38°C (Ambient)
19.6 bar (approx. 285 psi)
15.9 bar (approx. 230 psi)
100°C
17.7 bar (approx. 257 psi)
13.3 bar
200°C
13.8 bar (approx. 200 psi)
11.2 bar
300°C
10.0 bar (approx. 145 psi)
10.0 bar
400°C
6.5 bar (approx. 94 psi)
6.5 bar
Key Points:
At ambient temperature (up to approx. 38°C/100°F), a carbon steel Class 150 flange is rated for about 285 psi (19.6 bar).
The flange is only rated for exactly its nominal 150 psi around a much higher temperature of approximately 260°C (500°F).
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