Resources

Duty Of Pumps

Pumps are required to displace fluids within a system of piping against the respective total friction head of the pipe system. Typical example: The forced circulating system, e.g. of a central heating installation. In the...
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Category: Pump Fundamental Guides

Design Duty Point Of The Pump

Defined as that Duty Point on the H-Q curve where a centrifugal pump operates at maximum efficiency. It is determined by the Flow Rate...
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Category: Pump Fundamental Guides

Pump H-Q Curve

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...
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Category: Pump Fundamental Guides

Cavitation

Cavitation - cavity formation - is discharged by parts of the pumped fluid forcefully flashing into a vapour and the resulting formation of bubbles. This occurs if the static pressure in the fluid falls below the temperature related vapour...
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Category: Pump Fundamental Guides

Avoiding Cavitation

If the available system inlet pressure, also termed static pressure, falls bellow the required pump inlet pressure, suitable measures must be taken to achieve at least an equilibrium such as: ...
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Category: Pump Fundamental Guides

Vapour Pressure

Defined as that absolute pressure at which the vapour contained in a substance is at equilibrium with its liquid or solid phase. Significant for centrifugal pump technology is only the actual transition between gaseous and liquid phases....
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Category: Pump Fundamental Guides

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: Pump Fundamental Guides

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: Pump Fundamental Guides

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: Pump Fundamental Guides

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: Pump Fundamental Guides

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