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Flange pressure rating variances

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dutch1956

Chemical
Joined
Sep 7, 2012
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5
Location
US
Are there variances on pressure rating on ANSI flanges.

I.E. 3" diameter std 150 class line,,,,C/S
<100F,,,,,,,285psi
PSV set at 295psi
Acceptable or not???
 
No. The pressure-temperature ratings unique to flanges as referenced in ASME B16.5 is the maximum working pressure for the stated service temperature. So, for a standard 150 lb class flange made from carbon steel, the maximum allowable working pressure at 100 deg F or less fluid temperature is 285 psig.
 
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