Additional Features; Safety Rope; Plastic Pipes; Flow Sleeve - Lorentz PSk2-7 Manuel D'installation Et De Fonctionnement

50 Pump Installation

9.2.8 Additional Features

9.2.8.1 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.

9.2.8.2 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.

9.2.8.3 Flow sleeve

All LORENTZ PSk2 submersible pumps are designed for the
use of water with a temperature between 0°C and 30°C.
The minimum liquid velocity past the motor is 0.16 m/s.
CAUTION – Where the stated liquid
velocity cannot be achieved, a flow sleeve
must be installed.
For the maximum recommended sand content, before any
significant detrimental effects occur, check chapter "11
Operating the Pump" on page 68.
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.
Figure 32: Operation of a flow sleeve