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I am running the pump at different RPM using VFD but at one condition my pump shut off head comes in negative how i can increase my pump shut off head??

Goulds Pumps for oil & Gas

thanks all for sharing your experiences, please give me more exploration on parallel operation shut off .

thanks for your suggestion but as per my knowledge pumps minimum flow should not be the more than the process minimum flow, and for shut off API 610 say for parallel operation minimum shut off head should not be less than 10 %,i want to know why 10 % shut off head is required.

Please explain me pump minimum flow should be less than process minimum flow .If it get more than process minimum flow how to control that flow. Also please explain me why the shut off head should be 5 % in normal operation & 10 % for parallel operation ?