8.3.2 Installation and Handling
To lower the pumps into the borehole, a crane or hoist is
recommended, depending on the size and weight of your
pump system.
All parts have to be strong enough to withstand the weight
of the pump, the motor, the motor cable and the pipe
system.
It is also helpful to lower a pump dummy into the borehole
before you lower the pump to make sure that the hole
is completely free and the pump can slide into the hole
without obstructions.
WARNING – Never stand under
suspended loads.
WARNING – Always take suitable secu-
rity precautions (e.g. a strong safety rope)
to safeguard the pump against slipping
into the well during installation!
CAUTION – Be careful not to bend the
pump, take particular care with centrifu-
gal (C) pumps with a high number of stag-
es. Make sure that the pump never stands
on the motor cable, that the cable does
not get jammed or damaged by sharp
ledges or that the cable is not pulled or
jerked where it enters the motor.
CAUTION – Helical rotor pumps (“HR
pumps”) have an eccentric rotor that
causes vibration when the pump is run-
ning. This vibration is normal an will not
damage the pump. the plumbing equip-
ment such as pipe connectors, riser pipes,
etc. must be able to withstand vibrations
and should be made of decent quality.
During the process of lowering the pump into the well the
motor cable has to be fixed properly to the pipe, see “Figure
10: Fixing of the motor cable at a joint and a strait pipe” on
page 36. Where a plastic pipe is used, the longitudinal
stretch of the pipe under load has to be considered by
leaving a sufficient gap between the pipe and the cable! The
cable should be fixed with water-resistant tape. It is a good
installation practice to form a loop with the motor cable
near the pump and repeat it about every 40 m / 130 ft along
the riser pipe. This will keep any tensile forces away from the
motor cable.
To extend the motor cable pay attention to chapter “8.1.2
Cable Splicing” on page 33. Round off the edges of a
flange to prevent damage to the cable. Do not fix the cable
tightly. Leave space for the pipes to expand. The cable needs
to get fixed every 3 m.
NOTE – Measuring and noting down the
distances between the fixing will help to
lower the pump to the right depth.
5050
77
77
50
Figure 10: Fixing of the motor cable at a joint and a strait
pipe
tape
3 m
36 Pump Installation
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