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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.
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.
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
flow rate 10 % of Q
For pumps with a three-phase motor, install a built-in or
external overload switch and set it correctly.
Do not exceed the permitted ambient temperature of 40 °C.
2.9.5
Pressure surges
Valves which close suddenly can cause pressure surges which far
exceed the maximum permissible housing pressure of the pump.
Install shock absorber or air vessel.
Avoid valves which close suddenly or, if present, close them
slowly.
2.9.6
Blockages in the pump
Pieces of dirt in the suction line can clog and block the pump.
Do not operate the pump without a strainer basket or a
strainer basket handle.
Check how easily the pump rotates before starting it up and
after longer idle or storage periods.
08|2018
.
max
Safety
EN 11
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