Wilo -NL 32-125 Einbau- Und Betriebsanleitung Seite 28

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The following is required:
a = a1 and b = b1
Fig. 6
7.6 Checking before installation
Before installing the pump on the plant, the fol-
lowing points must be checked:
• Is the electrical current to the drive motor swit-
ched off?
• Are suction and discharge lines emptied and clo-
sed by valves?
• Is it possible to rotate the pump easily by hand
(for this purpose turn the fan of the motor or the
coupling)?
• Have the latest internal/plant instructions been
observed?
7.7 Mounting the pump and installation into pipe-
work
The following instructions must be carried out:
1. Remove the protective covers from the pump
flanges and the auxiliary pipework connections.
2. Correctly insert the flange seals.
3. Connect the suction or feed line.
4. Connect the discharge line.
The pump must be aligned with the pipework.
The pipework must be supported so that distor-
tion cannot occur when connecting the pump.
7.8 Final work
The following final steps must be undertaken:
1. Check the tightness of the connecting flanges.
2. Check for easy running of the pump (for that
purpose turn the motor fan or the coupling).
3. Check the coupling alignment.
4. Install the coupling guard.
7.9 Hydrostatic pressure test
When subjecting the piping system to a hydro-
static pressure test, exclude the pump from the
pressure test.
If it is not possible to test the pipework without
the pump, ensure that foreign material cannot
enter the pump.
NOTE: The max. Permissible pressure for a pres-
sure test is 1.3 times the nominal pump pressure.
The nominal pump pressure is indicated in the
technical data sheet.
28
Ruler
8. Start-up and shut-down operations
8.1 Requirements
The pump or the pumpset must be installed in
accordance with the recommendations listed in
chapter 5.
8.2 Use of trained staff
Only appropriately trained staff must carry out
the work described in this chapter.
8.3 Safety measures
CAUTION!
• Electrical connections must be made according
to the European Regulations and Directives for
the Standards in Industry and in compliance with
the instructions of the local power supply utili-
ties of the country concerned.
• Only appropriately authorised personnel may
carry out this work.
WARNING !
• Fill the pump correctly; otherwise the shaft seal
could be destroyed.
• Fill the supply lines correctly.
• Check the direction of rotation only when the
pump is filled.
• Fill the pump slowly if hot media are being pum-
ped in order to avoid distortions or heat shock.
• When handling explosive, toxic, hot, crystalline or
corrosive media, ensure that there is no risk to
people or the environment.
• Control the output at constant speed at the
discharge side only. The valve at the suction side
must always be completely open during opera-
tion to avoid any risk of cavitation.
• If there is no bypass line, do not run the pump
with the control valve closed for any length of
time.
• Safety measures should be taken by the end user
to ensure (for example by means of a relief valve)
that the permissible pump casing pressure is not
exceeded during operation.
• Repeat the alignment of the coupling at opera-
ting temperature. Re-align the pump or the
motor, if necessary.
8.4 Filling and venting the pump
Before the first use, the pump and its suction
pipe must be full of liquid to avoid any dry run-
ning. The pump and the mechanical seal must be
fully purged of gas.
CAUTION!
If the pump is purged of gas with a hot fluid,
prevent any risk of burning by containing the
leakages. In case of hot water, some steam can
escape from the vent.
• Wear suitable clothes and protection such as
gloves Please use also a face protector.
• Use pliers.
• Never touch the parts of the pump that can be
hot.
• At the end of the purge, close tight the air vent.
WILO AG 09/2007