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4.5
4.6
4.6.1
4.6.2
4.7
4.8
22
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.
Make sure that when a pump is running, rotating parts are always properly
screened off by the guard!
Adjustment of shaft sealing
Stuffing box packing
After the pump is started, the stuffing box packing will show a certain amount of leakage.
Because of the expansion of the packing fibres, this leakage will gradually decrease.
Make sure that the stuffing box packing never runs dry. To prevent this, loosen the gland
nuts to the extent that the stuffing box packing leaks by drops. As soon as the pump has
reached the proper temperature (and leakage is still too much) the gland can be adjusted
permanently:
1 Tighten both nuts, one after the other, a quarter turn.
2 Wait 15 minutes after each adjustment before making the next adjustment.
3 Continue in this way until an acceptable leakage by drops has been attained
3
(10/20 cm
/h).
Mechanical seal
• A mechanical seal may never show visible leakage.
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.
Noise
The noise production of a pump depends to a great extent on the operating conditions.
The values stated in paragraph 10.8 "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.
Commissioning
MCHZ/EN (0912) 4.2
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