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Self-Priming Centrifugal Pumps

Centrifugal pumps are classified as self-priming if they have the capability to handle liquids, gases and liquid/gas mixtures. The pump suction pipe is then air-evacuated without any special external suction devices. Centrifugal pumps...
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Category: Pumping Fundamentals

Static Head

Defined as that part of the total head which is equal to the static level difference between inlet and out let of a pipe system. Note:- The static head in pure circulating systems can be taken as zero when calculating the...
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Category: Pumping Fundamentals

Rotational Speed - Affinity Laws

The affinity laws lay down the dependency of hydraulic characteristic data of centrifugal pumps on the pumps rotational speed. The affinity laws are applicable to friction-less systems with incompressible liquids. They are to be viewed as...
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Category: Pumping Fundamentals

Suction Lift with non Self-priming Centrifugal Pumps

When handling water at temperatures below 100 degrees Celsius i.e. chilled or cold water services the available inlet pressure at the pump suction port will become negative in value. That means that the local atmospheric pressure is higher than...
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Category: Pumping Fundamentals

Duty Point

The DIN 24260 Pt1 standard defines the duty point as the intersection of the pump H-Q curve and the system H-Q curve. It indicates the values of flow and head which will be obtained at stationary operation with the respective speed related pump H...
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Category: Pumping Fundamentals

Shape Of H-Q Curves

The shape of the pump duty curve and it's course are main basis for judging all technical application criteria regarding the operational character of the system. This is particularly the case with regards to heating circulating systems in building...
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Category: Pumping Fundamentals

Required Pump Shaft Power

Accurate selection of the pump drive and calculation of operating cost or feasibility studies require the knowledge of the drive power required for the pump to operate at the required Duty Point...
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Category: Pumping Fundamentals

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