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

8.4.3 Installation and Handling

Handling – When lifting the pump use the eyebolts at the
motor housing. If that is not possible lift the pump at the
motor flange by using a holder or straps.
Strainer – If pipelines are welded together metal pieces
might be present in the pipeline. Before pump installation,
the inlet pipeline must be carefully cleaned. It is recom-
mended to install a strainer about 1 m / 3 ft in front of the
pump inlet to avoid pump damage due to any kind of im-
purities (cp. "Figure 18: Strainer"). The pressure drop of the
strainer must be considered in the suction lift calculation.
Pipe system – We advise that pipe expansion joints are
used close to the pump on both inlet and outlet to reduce
noise and vibration (cp. "Figure 19: Pipe expansion joints").
It is recommended that you install a gate valve in the
suction and discharge pipeline close to the pump to avoid
draining of the pipe while cleaning (e.g. filters), repairing,
servicing or replacing the pump system.
WARNING – Inlet and outlet pipes must be
mounted to the pump housing free of
tension.
CAUTION – Make sure that the suction
pipe is sealed with no leaks, otherwise the
pump will not prime or will prime
insufficiently.
CAUTION – The pumps are shipped with
plastic covers on the pump inlet and
outlet. Remove them before connecting
the pipes to the pump.
Pump Installation
Check valve – A check valve at the inlet pipe is needed
to assure that the pump and its suction pipeline remains
completely water filled during the time the pump is switched
OFF. Always install a check valve with one inch (1") larger
diameter than the suction pipe in order to avoid too much
suction pressure drop. For example if the suction pipe size is
3", then a 4" check valve should be installed.
Figure 18: Strainer
filtered
flow
Figure 19: Pipe expansion joints
45
unfiltered
flow
filter element
particle accumulation