Abstract
Methods are defined for reducing two or more parallel pipes to a single hydraulically equivalent pipe for analysis using the Darcy-Weisbach equation that allows the friction factor to depend upon the flow conditions in the pipe, as well as the roughness of the pipe wall. The motivation for reducing groups of parallel pipes to single equivalent pipes is to reduce computer costs associated with analyses of large piping networks. Comparisons of the saving in computer execution time achieved in network analysis by utilizing the equivalent pipe technique are given for different methods of solving large networks. For the real system used in this comparison one method of solution required only one-quarter of the time if parallel pipes were formed first. The recommendation is that existing network analysis computer programs incorporate in their code the creation of hydraulic equivalent pipes for all groups of parallel pipes.
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