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  1. slazzi

    Piping Classes Origin ?

    Hello Everybody, I am trying to understand what is the exact meaning of ASME B31.3 Piping Classes numbers : 150, 300, 600, 900 ... To be more precise : when I read "the rating of this pipe is 150 lbs", what is the exact meaning of 150 lbs ... lb is not a pressure unit ! I have asked the...
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