Pipework Connection - Grundfos SQ Series Installation And Operating Instructions Manual

7.8 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 ex-
pansion of the pipes when loaded 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 Pipework connection 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
Pipework connection
7.8.1 Cable clips
Cable clips must be fitted every 3 metres. See fig.
Pipework connection.
When connecting plastic pipes, some slackness
must be left between each cable clip as plastic pipes
expand when loaded.
16
Where flanged pipes are used, the cable clips
should be fitted above and below each joint.
7.8.2 Installation depths
Maximum installation depth below the static water
level: 150 metres. See fig. Pipework connection.
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.
7.8.3 When lowering the pump into the borehole
It is recommended to secure the pump by an
unloaded straining wire. See fig. Pipework
connection, pos. 2.
Slacken the straining wire so that it becomes
unloaded and lock it to the borehole seal by means of
wire locks.
3m
Max.
150 m
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.