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  1. buisse

    Origin of the use of the word "schedule" to describe pipe thicknesses

    TBP, Many thanks for your reply! Very definitive. Even some real old grey-beards I asked didn't know the answer to this question.
  2. buisse

    Origin of the use of the word "schedule" to describe pipe thicknesses

    Does anyone know why we say "schedule 40" or "schedule 80" to refer to pipe wall thicknesses? Why do we call it a "schedule"? I am guessing the root of the use lies in sewers, but if anyone has a definitive answer......

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