### (PDF) Pumping system head estimation - ResearchGate

2008-11-28 · For closed systems: Pump head = the sum of all friction pressure drops Where: Friction pressure drop = piping pressure drop + terminal unit pressure drop + source unit pressure drop* + valve pressure drop + accessories pressure drop. 1. For open systems: Pump head = the sum of all friction losses plus the static lift of the fluid plus the pressure head.

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