Second, calculate the NPSH available (NPSHa). This value represents the absolute pressure available at the pump inlet. If the NPSHa is 3 feet more than the NPSHr, the pump will not cavitate. Be aware, NPSHr is measured under ideal conditions for repeatability and accurate bench...
Water creates pressure or resistance, at predictable rates, so we can calculate pump head as the differential pressure that a pump has to overcome in order to raise the water. Common units are feet of head and pounds per square inch. (A pump characteristic curve calculator might offer ...