Liquid Pump Installation Information

Relation of Pressure to Elevation

In a static liquid (a body of liquid at rest), the pressure difference between any two points is in direct proportion only to the vertical distance between the points.

Calculate this pressure difference by multiplying the vertical distance by the density (or vertical distance x density of water x specific gravity of the fluid).

Static Head
The hydraulic pressure at a point in a fluid when the liquid is at rest.

Friction Head
The loss in pressure or energy due to frictional losses in flow.

Discharge Head
The outlet pressure of a pump in operation.

Total Head
The total pressure difference between the inlet and outlet of a pump in operation.

Suction Head
The inlet pressure of a pump when above atmospheric pressure.

Suction Lift
The inlet pressure of a pump when below atmospheric pressure.