Pump Installation; General Instructions; Pipe Sizing; For Surface Pumps - Lorentz PSk2-7 Manuel D'installation Et De Fonctionnement

9 Pump Installation

9.1 General instructions

WARNING – All electrical connections
must be performed by qualified experts
only.
WARNING – Before starting any work on
the pump/motor, make sure that the
electricity supply has been switched off
and that it cannot be accidentally
switched on!
CAUTION – Before you start the assembly,
make sure that all parts were delivered
and have not been damaged during
transport.

For surface pumps:

WARNING – PSk CS pumps must NOT be
submerged in water or subjected to rain
or dripping water.
WARNING – If the pump is installed in a
humid area, effective ventilation and
aeration must be provided in order to
prevent condensation.
WARNING – When installing in very small
installation spaces the natural cooling
may be insufficient. Carefully consider the
ventilation in order not to exceed the
maximum environmental temperature.
WARNING – The pump might heat up in
operation. The pump must not be installed
on combustible surfaces. Strong
incombustible surfaces should be used e.g.
concrete or stone surfaces.
Pump Installation

9.1.1 Pipe sizing

LORENTZ pump systems are extremely efficient. It is impor-
tant to keep this efficiency throughout the entire system.
A main reason for loss of efficiency is pipe pressure losses.
Make sure that you have included the pipe pressure losses
during the sizing process of your system.
Consider a smart pipeline design from the beginning.
CAUTION – Consult COMPASS or a pipe
pressure sizing chart to determine the
correct size. Oversize the pipe line to
reduce the pressure drop.
CAUTION – The length of the inlet and of
the outlet pipeline must be considered for
the calculation of the pressure losses.
CAUTION – Only run the pump when it is
completely prefilled with water (surface
pumps), submersible pumps must be
completely submerged. This means there
must be no air in the pipes.
CAUTION – For surface pumps, air locks
must be avoided at the inlet pipe line.
Avoid sharp 90° elbows and sharp pipe
size adaptors (cf. "Figure 18: Prevent air
locks in pipes" on page 38 and "Figure
19: Avoid sharp 90° elbows and size
adaptors" on page 38).
HDPE-pipes – The use of correctly specified plastic pipes
is possible.
If you are not sure about the strength of your pipes contact
the pipe manufacturer.
CAUTION – When you use plastic pipes you
must use a safety rope.
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