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4 Installation
To ensure optimum operation it is important that any pump unit is installed correctly. When designing a pumping system the
following should be taken into consideration.
4.2
System design and installation
Design:
Discharge line
Plan view
Suction line
Manifold suction/Common Line
-
Confirm the Net Positive Suction Head (NPSH) available
from the system exceeds the NPSH required by the pump,
as this is crucial for ensuring the smooth operation of the
pump and preventing cavitation.
-
Avoid suction lifts and manifold/common suction lines for
two pumps running in parallel, as this may cause vibration
or cavitation.
-
Protect the pump against blockage from hard solid objects
e.g. nuts, bolts welding slag etc. Also protect the pump
from accidental operation against a closed valve by using
relief valves, pressure switches or current limiting devices.
-
Fit suction and discharge monitor points for diagnostic
purposes.
-
Fit valves, if two pumps are to be used on manifold/common
discharge lines.
-
Make the necessary piping arrangements if flushing is
required for the seal or if a media is required for heating/
cooling jackets and saddles.
-
Allow at least 1 m for pump access/maintenance all around
the pump.
-
Do not subject rotary lobe pumps to rapid temperature
changes, as pump seizure can result from thermal shock.
Pipework:
All pipework must be supported. The pump must not be allowed to support any of the pipework weight beyond the limits
set as shown in the following table.
Remember:
Pipework supports must also support the weight of the product
being pumped.
-
Design short straight suction lines to reduce friction losses
in the pipework thereby improving the NPSH available from
the system.
-
Avoid bends, tees and any restrictions close to either
suction or discharge side of pump. Use long radius bends
wherever possible.
-
Provide isolating valves on each side of the pump when
necessary.
-
Keep pipework horizontal where applicable to reduce air
locks. Include eccentric reducers on suction lines.
TD 243-089
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