Recent content by NatGas

jt, Thank you for the answer and those references. Those are very useful to me.

I work in the natural gas industry. We have 150, 300, and 600# ANSI flanges in our system. Some of our old documentation has the old maop for these flanges. I believe in 1988 ANSI raised the ratings for these three flange classes. Is there a directive anywhere in the ANSI standards, or...