Pumps in Series vs. Parallel: Engineering Guide to Staging & System Curves
If you are deciding between pumps in series vs parallel, you are really deciding what you want the station to do when the process changes: build more head, pass more flow, ride out a pump outage, or hold efficiency near BEP across a wide operating band. The right answer shows up when you put the combined curves on the same plot as your system curve, then pressure check the suction limits, controls, and failure modes you will actually see on site.
