Lorentz PSk2 CS-F Series, Руководство по установке, эксплуатации и обслуживанию, Страница: 20 / 36

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Sun. Water. Life.
BERNT LORENTZ GmbH & Co. KG Kroegerskoppel 7, 24558 Henstedt-Ulzburg, Germany, Tel. +49 (0) 4193 7548 - 0, Fax - 29, www.lorentz.de
All specifi cations and information are given with good intent, errors are possible and products may be subject to change without notice. Pictures may
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v150106
10 4 Installation and handling
Handling
ƒ CS-F pumps: Eye bolts can be used for lifting.
ƒ CS-G pumps: Must be lifted by the base. Use the
eyebolts to stabilize the pump, cf. “Figure 18: Pump
handling/lifting” below. It is recommended to use
suitable lifting sling belts.
Strainer – If pipelines are welded together metal pieces
might be present in the pipeline. Before pump instal-
lation, the inlet pipeline must be carefully cleaned. It is
recommended to install a strainer ca. 1 m / 3 ft in front of
the pump inlet to avoid pump damage due to any kind
of impurities. The pressure drop of the strainer must be
considered in the suction lift calculation, see “9.4.4 Cable
entries and external sockets” on page 14.
Pipe system – We advise that pipe expansion joints are
used close to the pump on both inlet and outlet to reduce
noise and vibration. 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 in a way that is 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
Figure 18: Pump handling/lifting
pump
Check valve – A check valve at the beginning of 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.
NOTE: Our experience shows that
pressure losses of check valves are
higher than in “Table 12: Friction
loss for valves and fittings – equiva-
lent length of straight pipe” on
page 31 This is probably caused
by the screen of the check valve we
have used in our test We again
strongly advise to use 1” larger
check valve