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F22 Class 1 v Class 3 & B16.5

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StevenHPerry

StevenHPerry

Mechanical
Sep 15, 2006
210
The B31.1, B31.3 piping codes plus ASME Section 2 list ASTM/ASME A182 Gr F22 in two classes, 1 and 3. There are different stress values given for the different classes

B16.5 and B16.34 give pressure / temperature ratings for only F22 Cl 3.

First...

has anyone encountered a ASTM A182 F22 Cl 1 valve or flange? I haven't yet found a supplier that will offer me Cl 1.

Second...

any guesses to why the B16 code committee excluded Cl 1?

- Steve Perry
 
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