As you known, AWWA C207 is American Water Works Association standard for flanges, they have Class D, E, F etc, different is flange’s thickness using for different pressure. But in BS 10 standard, also have Table D, E, F Classes for flanges, so I guess, maybe they have some relations about the 2 norms of flanges. Who can answer me to this question? Maybe I am wrong, they have no relations, just have the same name? Waiting for your comments.
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