If that sounded a little technical it’s because it is! Long story short – your centrifugal pump doesn’t dictate your flow rate – your plumbing system does. Once calculated, static head doesn’t change for a system – unless a plumbing change is made. Also note that some systems have a pressurized supply and/or discharge point (pressure vessel or pressurized pipe) these will also add to the Total Static Head. Total Static Head consists of both Static Suction Head and Static Discharge Head, and each of these can be positive or negative, depending if the supply source and discharge point are located above or below the pump elevation. The total vertical rise in the system is commonly referred to as Total Static Head. However, unlike positive displacement pumps ( gear, roller, diaphragm and others), the flow rate from a centrifugal pump will vary significantly depending upon the details of the suction and discharge piping and other “head losses” in the user’s system (restrictions to flow such as elbows, tees, reducers, strainers, meters, valves, etc) and the vertical rise (or drop) from the supply source to the discharge point.
Many pump users mistakenly think that a centrifugal pump will provide its maximum published flow rate in all applications.
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