Operating temperature

The operating temperature is the highest possible liquid temperature for which the respective centrifugal pump has been rated.

The maximum and minimum temperatures of the pumped medium are of particular importance for the design of the pump. They are taken into account in the selection of materials and seals and, if necessary, in a media-material resistance test.

The fluid properties (density, viscosity) change with the temperature. The power requirement of the pump is directly proportional to the density. Therefore, the temperature must be taken into account from the operating range with the maximum density. Furthermore, for viscous media (ν > 10 mm²/s), the shape of the pump performance curve must be converted.

 

More articles on this topic

Density

The density is an important fluid property that depends on the temperature. The density of the pumped medium has a direct influence on the power requirement of the pump.

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Pumped medium

The liquid to be pumped (pumped medium) has a fundamental influence on the selection and configuration of a pump.

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Speed – Affinity Laws

The affinity law describes the speed dependency of the delivery parameters of centrifugal pumps. It can be derived from the general similarity relationships as a special case.

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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.

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Curve Corrections for Different Fluids

Pump curves are mostly established for water. Duty (H-Q) and efficiency (η-Q) curves become close to being valid for all Newtonian fluids, while the shaft power is proportional to the density of the pumped medium.

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