Net Positive Suction Head (NPSH) must always be considered when using diaphragm metering pumps, especially hydraulically actuated diaphragm metering pumps. Every diaphragm metering pump has an NPSH requirement that varies between pump manufacturers. The available NPSH in the process must meet or exceed the required NPSH in order to prevent the fluid from cavitating at the pump, and to prevent damage to the pump itself.

In hydraulically actuated diaphragm metering pumps, Minimum Suction Head (MSH) must also be evaluated. MSH is the pressure requirement stated by the pump manufacturer to ensure that the pump's hydraulic fluid does not cavitate. Cavitation of the hydraulic fluid will always result in poor pump performance.

Click Here to Download the NPSH Calculator Program   (ZIP - 343 KB)
 

INSTALLATION INSTRUCTIONS