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2.5 Hydraulic system
The pump is generally part of a hydraulic system that can include a various number of components such as:
valves, fittings, filters, expansion joints, instruments, etc. The way the piping is arranged and the position of
the components has a great influence on the operation and on the life of the pump.
2.6 Pipes Connection
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Position the pump as near as possible to the liquid source and under the level of the liquid (under
head). Always use pipes as short and straight as possible and limit the number of bends assuring
radius of curvature as large as possible. Avoid air siphon that can be created in the long piping line.
Avoid the creation of siphon also before the suction of the pump. The piping should be properly
supported and kept in line independently from the pump, up to its connections, so that the piping
doesn't exert loads on the pump.
The size of the suction and discharge pipes have to be at least as large as the inlet connection of the
pump. Diameter restriction of the suction pipe is responsible and causes cavitation of the pump,
creating a loss in the performance of the pump and a rapid wear. It's always advisable to use (if
needed) flexible reinforced pipes that can withstand the discharge pressure.
The suction line has to be clean and/or contain a filter to protect the impeller from damage due to
impurities, or other foreign particles, especially when starting the plant for the first time.
Don't use metallic piping with plastic pumps.
Don't use tools to connect piping to plastic pumps. Make sure that the connections are properly
tightened otherwise the suction capacity will be reduced.
The installation of a proper pressure gauge on both the suction and discharge piping is
recommended. The installation of gauges allows an easy control of the correct functioning of the
pump in relation with the required working point. In case of cavitation or other dysfunctions, the
gauges will show evident pressure fluctuations.
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If these warnings are not observed the Certification and the Warranty of the pump can be invalidated.
2.7 Monitoring Equipment
According to the importance of the pumping system, it could be useful to maintain a strict control of
the performances and conditions of the process. The use of instruments to monitor the pressure of
the suction and discharge circuit is recommended. Even the monitoring of the electric power
absorbed by the motor is possible using a wattmeter.
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