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26 Commissioning CR/EN (1004) 4.0
4.4 Preparing the pump unit for commissioning
Proceed as follows, both when the unit is put into operation for the first time and after the
pump has been overhauled.
1 Fully open the stop valve in the suction pipe. Close the delivery stop valve.
2 Fill the pump and the suction pipe with the liquid to be pumped.
3 Turn the pump shaft a few times by hand and add more liquid, if necessary.
4.5 Checking the sense of rotation
ƽ Beware of possible non-screened rotating parts, when checking the sense of
rotation!
1 The sense of rotation of the pump is indicated by an arrow. Check whether the sense
of rotation of the motor corresponds with that of the pump.
2 Let the motor run for only a short time and check the sense of rotation.
3 If the sense of rotation is not correct, alter the sense of rotation. See the instructions
in the user manual belonging to the electric motor.
4 Fit the guard.
4.6 Start-up
1 Open the stop valves in the supply and return lines for flushing or cooling liquid, if the
pump is connected to a flushing or cooling system. Ensure these systems are
switched on and set at the proper values.
2 Start the pump.
3 As soon as the pump is under pressure, slowly open the delivery stop valve until the
working pressure is attained.
4 Open the outlet valve fully until the pump reaches the correct duty point.
ƽ Make sure that when a pump is running, rotating parts are always properly
screened off by the guard!
4.7 Pump in operation
When the pump is in operation, pay attention to the following:
• The pump should never run dry.
• Never use a stop valve in the suction line to control pump output. The stop valve
should always be fully opened during operation.
• Check whether the absolute inlet pressure is sufficient, to prevent vaporization in the
pump.
• Check whether the pressure difference between suction and delivery side
corresponds with the specifications of the pump's duty point.
4.8 Noise
The noise production of a pump depends to a great extent on the operating conditions.
The values stated in paragraph 10.5 "Noise data" are based on normal operation of the
pump, driven by an electric motor. In case the pump is driven by a combustion engine, or
in case it is used outside the normal operation area, as well as in case of cavitation, the
noise level may exceed 85 dB(A). In that case precautions should be taken, like building
a noise-barrier around the unit or wearing hearing protection.