Inflection Point Engineering Calculators

Pump NPSH Available

Available net positive suction head (NPSHa) from suction vessel conditions, static head, and line losses, with margin and ratio checks against the pump’s NPSHr. Also computes suction specific speed per Hydraulic Institute 9.6.1.

Method: Bernoulli energy balance on the suction side. References: Karassik, Pump Handbook, 4th ed., Ch. 2.3; Hydraulic Institute ANSI/HI 9.6.1 (suction specific speed limits); API 610 recommends a minimum margin of 3 ft and ratio ≥ 1.3.