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Glanded (Dry-Motor) Pump

Design The uniform feature of glanded pumps is the separation between the pumped fluid and the drive motor. The connection between the impeller in the pump body and the motor is made by either a common shaft or by coupled shaft parts....
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Category: Pumping Fundamentals

Monobloc Glanded Centrifugal Pump

The monobloc pump design with flange mounted drive motors has found its place in mechanical building services as well as applications requiring greater duties. The pumps can be directly pipe mounted or, if necessary, mounted on a support bracket...
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Category: Pumping Fundamentals

DIN-Standards Centrifugal End-Suction Pump

The bed-plate mounted centrifugal pump to DIN 24255 is only rarely used in conjunction with mechanical building services. They are mainly used in installations requiring large flow rates, abnormally high working pressures (cast steel, S G Iron) or...
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Category: Pumping Fundamentals

Shaft Seals

Glanded Pumps, unlike Glandless Pumps, require shaft seals to separate the fluid handled from the drive motor. Two seal systems are generally in use: Packed Gland Seal The packed gland seal - the conventional shaft seal - is, due...
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Category: Pumping Fundamentals

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: Pumping Fundamentals

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: Pumping Fundamentals

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: Pumping Fundamentals

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: Pumping Fundamentals

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: Pumping Fundamentals

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: Pumping Fundamentals

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