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A181-I Flange Rating

A181-I Flange Rating

A181-I Flange Rating

(OP)
I am modifying a nozzle on an existing ASME VIII vessel.  The vessel was built several years ago and the drawings and U1A report state that the nozzle flange material used was A181-I.

I am running the analysis in Compress and it is telling me that the MAWP for a 300# flange with A181-I material is only rated for 590 psig.

My existing vessel has  a design pressure of 600 psig and this is listed on the original construction drawing and U1A report.

My question is:

1.)  Is this correct that a 300# flange made of A181-I is only rated for 590 psig?

2.)  Does anyone have a flange rating chart for A181-I flanges?

Thank you very much!

RE: A181-I Flange Rating

(OP)
Sorry, I meant to mention that my design temperature is 150F.

RE: A181-I Flange Rating

The ASTM A-181 specification is a standard for carbon steel forgings general purpose piping. Are you sure that is the correct specification for the flange material in question?

RE: A181-I Flange Rating

(OP)
Yes, the vessel was built in the early 1980's.

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