Graphical solution to the generalized parallel pump problem

摘要

The usual method of combining pumps in system design, using pump head versus GPM curves, is not applicable if the pumps see different static heads and different dynamic losses. The designer then turns to iterative procedures centered on matching each parallel pump discharge line pressure to the common junction pressure. A faster and generalized method, not in universal use, is presented in this article with its technical basis. If not implementing it already, Damage Control Officer's should be made aware of this technique because it eliminates iteration and has a utility to address any pump configuration or requirement. The method is graphical and may be extended to multiple parallel pump installations.