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2.9

Preventing material damage

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2.9.1

Leakage and pipe breakage

Vibrations and thermal expansion can cause pipes to break.



Install the pump/unit in a manner which reduces structure-

borne and airborne noise transmission. When doing so,

observe relevant regulations.

If the pipe forces are exceeded, leaks can occur at the screwed

connection or the pump itself.



Do not use the pump as a fixed point for the pipe line.



Connect pipes free of load and mount them elastically. Install

compensators if necessary.



If the pump leaks, the unit may not be operated and must be

disconnected from the mains power supply.

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2.9.2

Dry running

If run dry, mechanical seals and synthetic parts can be destroyed

within only a few seconds.



Do not allow the pump to run dry. This also applies to

checking the rotation direction.



Purge air from pump and suction line prior to start-up.

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2.9.3

Cavitation

Pipes which are too long increase resistance. This results in risk

of cavitation.



Ensure that the suction line does not leak.



Observe the maximum pipe length.



Only switch the pump on when the valve on the delivery side

is opened halfway.



Open the valve on the suction side completely.

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2.9.4