Static Head

Static head, abbreviated as \(h_s\), (English unit \({ft}\), Metric unit \({m}\)), is the vertical distance from a reference point of the liquid to a lower reference point of the liquid.

Static suction

Static suction, abbreviated as \(h_{ss}\), is the height of the liquid surface in the suction tank above the centerline of the pump. 

Static discharge

Static discharge, abbreviated as \(h_{sd}\), is the highest liquid surface in the discharge system above the centerline of the pump.