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Imperfection and scratch of face of flange

Imperfection and scratch of face of flange

Imperfection and scratch of face of flange

(OP)
Dear All,

We have vessel shipped to jobsite and found pitting on the face of flange.
I looked at ASME PCC-1, Table D-2, but it only talks about acceptable imperfection for "soft-faced gasket", which is not applicable to "soft gasket" such as spiral-wound that we are using. The pitting is about 0.008" deep in gasket seating area, and 0.011" in non-gasket seating area.

Does any one know where I can find an acceptable imperfection criteria for spiral-wound gasket seating surface? or is it mandatory to re-face ?

Thanks for you immediate help.




RE: Imperfection and scratch of face of flange

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RE: Imperfection and scratch of face of flange

jtseng123, if you can get a copy of TEMA, Fig. F-4 may give you some guidance,

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

RE: Imperfection and scratch of face of flange

You are correct in using PCC-1. A spiral wound gasket is a soft faced gasket (graphite filler), as opposed to metal faced gaskets (hard faced). The definition of hard and soft faced gaskets are included in Appendix B-2.

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