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Doc. ISM0076_MANUALE_CN SEAL-MV_ENG_REV04.DOCX
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SI
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if the suction tube was larger than the suction flange, you will use an eccentric reduction, in order to prevent
formation of air and turbulence;
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if there is a possibility that the maximum working pressure can be overcome, for example due to excessive
suction pressure, you should take appropriate measures by including a safety valve in the pipe;
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Avoid using quick-closing valves, because sudden changes of pressure cause water hammer very
dangerous for the pump and the pipes;
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Before installing the pump, make sure the suction line is clean and/or provided with a filter to protect the
impeller and the stationary bearings from damages incurred by slag, or other foreign particles , especially
when you start the installation for the first time.
Electrical connections:
DANGER
The pump is
provided with or without electric motor: only qualified personnel
should
carry out mechanical connection of the pump to the motor (for the model without motor)
and the electrical connections of the motor to the electrical system. Please read carefully
the instructions of the manufacturer of the motor or the manual before you complete the
installation.
Make sure that the motor doesn’t start during maintenance jobs.
14.5.
Checks for the proper operation
We recommend installing a pressure gauge on both inlet and outlet pipes to allow the operator to easily control
the proper pump functioning in relation to the required operating point: in case of cavitation or other malfunctions,
there will be obvious pressure fluctuations.
Check the differential pressure of the pump between the suction and discharge connections to verify that it works
in the point of work provided.
Check that the absolute pressure at suction is not so low to cause the cavitation.
CAUTION
The absolute pressure at pump suction (m) must be at least 0,5 to 1 m, the vapour
pressure of the pumped liquid, in order to avoid cavitation.
Cavitation should always be avoided as it is very dangerous for the structure of the pump.
Do not dry run the pump!
Commissioning and operator training
With regards to the proper commissioning, starting and controls to be carried out before, during and after the first
start, please refer to APPENDIX B, which must be filled and returned to M PUMPS to activate product warranty.
