Total static head

The static head means that part of the system H-Q curve that is unrelated to the flow.
Total static head

It consists basically of two parts:

  1. The pressure difference between discharge side and suction side tank. It is zero for open tanks and closed circulation systems.
  2. The height difference between the liquid levels of discharge side and suction side tanks respective the system inlet and outlet. It is zero for closed circulation systems.

This means for circulation systems the static head is always zero,

pin, pout = pressures on suction respectively discharge liquid levels
ρ = fluid density
g = gravity (9.81 m/s2)
Hgeo = static height difference between suction and discharge liquid levels


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System Curve

The system H-Q curve is essentially a parabolic curve representing the relation between the head (pressure) required to handle the respective rate of flow within a pipe system.

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