4.2.5 Connection of Piping to the Pump
NOTICE:
The pump must not be used as fixed point for the piping. The permitted piping loads must not
be exceeded, refer to .
Suction and discharge pipe
•
The pipes must be of a size and design that liquid can flow freely into the pump and that the pump
functions without problems. Particular attention is to be paid to ensuring that suction pipes are air-
tight and that the NPSH values are observed. Under suction lift condition lay the suction pipe in the
horizontal section towards the pump so that it is slightly inclined upwards so that no air traps occur.
Under positive suction head condition install the suction pipe work slightly declined towards the
pump. Do not install fittings or elbows right before the suction nozzle.
•
If the suction supply is under vacuum and entrained gas may be present in the liquid, it is recom-
mended that a vent line be considered up-stream of the pump suction with return to the suction
supply, above the max liquid level.
•
An additional flushed piping - discharge branch- vent line - makes it easier to de-aerate the pump
before start-up
Item No.
Description
1.
Vent line
Figure 5: Vent line
•
When laying the pipes, make sure that the pump is accessible for maintenance, installation and dis-
assembly.
•
Notice "Permitted Forces on Flanges" ().
•
If expansion joints are used in the pipes, they have to be supported in such a way that the pump is
not loaded unduly high because of the pressure in the pipes.
•
Before connecting up to pump: remove protective coverings from suction and discharge branches.
•
Before starting up, the pipe system, fittings and equipment must be cleaned to remove weld spatter,
scale etc. Any pollutants are to be completely removed from pump units that are directly or indirect-
ly connected to drinking water systems before being installed and taken into use.
•
To protect the shaft sealing (especially mechanical seals) against foreign impurities, it is recom-
mended that a sieve, 800 micron, is installed in the suction/intake pipe when the motor is being
started up.
•
If the pipe system is tested with the pump installed, do not exceed the maximum permitted casing
pressure of the pump and/or shaft sealing (see data sheet).
4.2 Piping checklists
Model ICP, ICPI, ICPH, ICPIH Installation, Operation and Maintenance Instruction
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