Pipework Connection; Cable Clips - Grundfos SQ Serie Montage- Und Betriebsanleitung

6.8 Pipework connection

If a tool, e.g. a chain pipe wrench, is used when the
riser pipe is fitted to the pump, the pump must only
be gripped by the pump discharge chamber.
When connecting plastic pipes, a compression
coupling should be used between the pump and the
first pipe section.
For pumps fitted with plastic pipes, the
expansion of the pipes when loaded
Note
should be taken into consideration,
when deciding on the installation depth
of the pump.
Where flanged pipes are used, the flanges should
be slotted to take the submersible drop cable.
Figure 11 shows a pump installation with indication of:
• position of cable clips, pos. 1, and distance
between the clips.
• fitting of straining wire, pos. 2.
• maximum installation depth below the static
water level.
1
2
Fig. 11

6.8.1 Cable clips

Cable clips must be fitted every 3 metres.
See fig. 11.
When connecting plastic pipes, some slackness
must be left between each cable clip as plastic pipes
expand when loaded.
Where flanged pipes are used, the cable clips
should be fitted above and below each joint.
6.8.2 Installation depths
Maximum installation depth below the static water
level: 150 metres. See fig. 11.
Minimum installation depths below the dynamic
water level:
• Vertical installation:
During start-up and operation, the pump must
always be completely submerged in water.
• Horizontal installation:
The pump must be installed and run at least
0.5 metres below the dynamic water level.
If there is a risk that the pump might be covered
by mud, the pump must always be fitted in a flow
sleeve.
6.8.3 When lowering the pump into the borehole
It is recommended to secure the pump by an
unloaded straining wire. See fig. 11, pos. 2.
Slacken the straining wire so that it becomes
3 metres
unloaded and lock it to the borehole seal by means
of wire locks.
Caution
Caution
Max.
150
metres
The straining wire must not be used for
pulling the pump with riser pipe out of
the borehole.
Do not lower or lift the pump by means
of the motor cable.
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