As some general rule it is proposed to use following formula for shutoff calculation in centrifugal pump.
Why we need such conservative rule (See attachment).
I mean "Suction design pressure" + 1.2 * Pump head
Why we should have pump "design pressure" condition during pump discharge blockage and head rise.
Edited by Ghasem.Bashiri, 06 December 2023 - 10:55 AM.