Contemporary commercial piping analysis programs deal differently with the problem of apparent lift-off of an operating pipe at a rod hanger or a one-way vertical support, such as a pipe on a support rack. A few programs provide error messages; others show a vertical movement with a possible increase in sustained (weight) stress (see NOTE below for CAEPIPE). A proper understanding of the standard piping design practice is the key to correct interpretation of these results from different programs. Such standard piping design practice was generally understood when the sustained and flexibility analysis rules were introduced in the 1955 Edition of the ASME B31 Code for Pressure Pipin
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