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ANSI B16.5 Rating specific question

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Nukie

Nuclear
Joined
Oct 11, 2001
Messages
23
Location
CA
HI all ,

I have a question regarding the rating for class 150

According to B16.5 1977
the pressure for @200deg is 195 psi


According to ASME SectIII Addendum S or W74
(which refer to B16.5)
the pressure for @200deg is 240 psi

It seems to had change after 1974 and before 1977

Anyone can tell me when this change has occur ?

Is it possible to have more details for this change ?

Regards
 
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