Calculation of NPSHa for gear pumps and screw pumps
Thread Content
May I ask, when calculating NPSHa for gear pumps and screw pumps, which formula is used? Only formulas related to centrifugal pumps and reciprocating pumps were found……
NPSHa is independent of the pump type and depends only on installation. Are you asking about NPSHr?
I just want to calculate NPSHa... I really don’t know which formula to use for gear pumps. NPSHr is related only to the pump itself, and we wait for the data provided by the manufacturer for that. But when submitting the data sheet, it’s necessary to calculate NPSHa
NPSHa is independent of the pump type. NPSHa = (P-Pv)/ρg ± △H - Hf (positive value for filling, negative value for suction)