Installation And Handling - Lorentz PS Série Manuel D'installation Et De Fonctionnement

40 Pump Installation

8.3.2 Installation and Handling

To lower the pumps into the borehole, a crane or hoist is
recommended, depending on 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 security
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
stages. 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.
During the process of lowering the pump into the well the
motor cable has to be fixed properly to the pipe, see "Figure
15: Fixing of the motor cable at a joint and a strait pipe" on
page 40. 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 37.
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.
Figure 15: Fixing of the motor cable at a joint and a strait
pipe
77
77
tape
3 m