8.3.5 Additional Features
8.3.5.1 Safety Rope
We recommend the use of a safety rope as a loss insurance.
If the pipe breaks because of start-up torques of the motor,
too much weight, pipe corrosion or wrong installation a
safety rope can prevent the total loss of the pump system
and damage to the well.
Choose a safety rope that can handle the weight of the
whole installation and the water inside the pipes. The rope
material must be water-resistant. Near the well head the
rope needs to be UV-resistant or protected from sunlight.
CAUTION – Do not use a nylon rope.
Nylon is known to absorb water over time
which will weaken the rope.
8.3.5.2 Plastic Pipes
When the pipes are strong enough the use of plastic pipes is
possible. If you are not sure about the strength of your pipes
contact the pipe manufacturer.
CAUTION –The pipes must be strong
enough to hold the whole weight of the
pump, the motor, the pipe system and the
water in the pipes. It must also withstand
the water pressure generated by the total
dynamic head.
CAUTION – When using plastic pipes you
should always use a safety rope.
8.3.5.3 Flow Sleeve
For the maximum recommended sand content, before any
significant detrimental effects occur, check chapter “4
Operating Conditions” on page 9.
A higher content will cause excessive wear within the pump
and reduce the pump’s life span considerably. Any pump
that is blocked by sand will not be covered by warranty.
To reduce the amount of particles entering the pump, a flow
sleeve can be installed, see “Figure 11: Flow Sleeve”.
Figure 11: Flow Sleeve
38 Pump Installation
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