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Stress Analysis for Piping Systems Resting on Supports

By Liang-Chuan Peng Peng Engineering |

    Piping-flexibility and stress analysis are required in the design of most piping systems before the piping is installed in a chemical-process or other plant. It is intended to ensure the safety of the plant and thus protect the interests of the owner and the general public. Owing to the availability of powerful computer software packages, the analysis has become simple and routine. However, due to misconceptions of some software approaches, some analyses performed do not reflect the actual situation of the piping. The engineers have unwittingly performed many erroneous analyses that put the safety of the plants in jeopardy. One of the most common misconceptions adopted by some computer programs is the method of analyzing the piping with regards to resting supports. The most common and economical approach in dealing with the numerous lines of piping in a process plant is to rest the piping on pipe racks or other support structures. The piping is either supported directly on the pipe wall or through pipe shoes, which are attachments placed under the pipe to distribute the pipe weight and other loads to the support. These types of supports are generally called resting supports. These supports are single-acting, because they…
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