Preventing Material Damage; Leakage And Pipe Breakage; Dry Running; Cavitation - Speck BADU 93 Manual De Uso

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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

Overheating

The following factors can result in the pump overheating:
• Excessive pressure on the delivery side.
• Motor overload switch set incorrectly.
• Ambient temperature which is too high.
 Do not operate the pump with the valves closed, minimum
flowrate 10 % of Qmax.
 For pumps with a three-phase motor, install a built-in or
external overload switch and set it correctly.
04|2017
Safety
EN 11