Good morning, I have a situation where I have existing 6" std wall piping with a 6" 300# flange WN. The new compressor that came in has a 6" 900# flange. I do not have any room for a spool piece (Flange to pipe to flange). I've looked through B31.3 and interpretations and I don't see anything referencing this configuration. It is a single bevel joint design which makes me think it is OK. The piece will be pressure tested as well. Trying to avoid cutting the flange off my existing piping and re-hydro testing the entire piping.
My question is weather or not I can weld a 6" 300# RFWN Flange to a 6" 900# RFWN Flange to make my connection?
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