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 elsewhere, that tells us if these "new" ratings are retroactive? In other words do our old 600# valves have to be limited to 1440 psi, or can they, like our newer valves, be subjected to 1480 psi? Thanks for any help you can give me on this.
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