4.4 Startup
Make sure that the pump is filled with
liquid. The pump must not run dry. Dry-
running will cause serious damage to the
stuffing boxes, shaft seals, wear rings and
shaft sleeves.
1. Start the pump.
2.
WARNING
Hot or cold surface
Death or serious personal injury
‐ Pay attention to the direction of the
vent hole, and ensure that the
escaping water does not cause
injury to persons or damage to the
motor or other components.
‐ In hot-water installations, pay
special attention to the risk of injury
caused by scalding hot water and
hot surfaces.
‐ In cold-liquid installations, pay
special attention to the risk of injury
caused by cold liquids and cold
surfaces.
Vent the pump during startup by loosening the
vent screw until a steady flow of liquid runs out of
the vent hole.
3. When the pipe system has been filled with liquid,
slowly open the outlet isolating or throttle valve
until it is completely open. Ensure that the
differential pressure developed by the pump is
within the performance range of the pump and/or
close to the designed duty point. Throttle the
outlet isolating valve or reduce the speed of the
pump if the flow exceeds the rated performance
range or the differential pressure is lower than the
rated performance range.
4. Ensure the pump unit is operating smoothly
without abnormal noise, vibration or overheating.
Do not allow a stuffing box to run dry,
and do not overtighten the stuffing box
gland to eliminate leaking as the shaft
sleeve will become damaged.
4.5 Final alignment
Make the final alignment by shimming the
motor only.
1. Let the pump run until it has reached its operating
temperature under normal operating conditions
(approximately 1 hour).
2. Stop the pump.
3. Remove the coupling guard.
4. Check the alignment on the coupling by means of
ruler or dial gauges or laser.
The coupling tolerances may differ from
coupling make to coupling make. For the
standard coupling, the allowable tolerance
is ± 0.13 mm. For other coupling types,
see the coupling data supplied with the
pump.
WARNING
Crushing hazard
Death or serious personal injury
‐ To protect persons from rotating
machine parts, always install all guards
after the installation is complete and
before starting the pump.
22
English (GB)
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