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

## More articles on this topic

### Pump Performance Curve

The pumping performance of a centrifugal pump is expressed in the form of an H-Q curve, depicting the Flow Q (e.g. in m³/h) and the Head H (e.g. in m) of the pump.

### Calculating the System H-Q Curve

The system H-Q curve depicts the dependency of the total head Hsystem on the Flow Q.

### 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.

### Dimensioning criterias

The dimensioning of pumps and pressure pipelines must be carried out step by step.

### Operating Point of a Centrifugal Pump

German standards DIN 24260, Pt.1 define the operating point (also working point) as the “intersection of the pump H-Q and the system H-Q curves.

The required total head for a pump is calculated as the sum of the static head and the friction loss head in the pipe system. Directly to the product selection in

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