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  • Users: DavidMack
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  1. DavidMack

    ASME B31.8 Appendix R Dent Strain

    Imagine a situation where a pipeline is installed on top of a rock (never happens, right?). A sharp rock will make a sharp dent, meaning that the dent profile has a small radius of curvature. ASME B31.8R allows us to estimate the strain using the measured radius of curvature. Feature fails, case...
  2. DavidMack

    HDPE pipe: permitted depth of scratches or gouges

    Many websites give the rule that HDPE pipe can handle a scratch as deep as 10% of the wall thickness without reducing the pressure rating of the pipe. One source for this is AWWA M-55 ['Manual for the Design and Installation of Polyethylene Pipe' from the American Water Works Association], which...

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