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  1. NatGas

    Increased flange ratings

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

    Increased flange ratings

    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...

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