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Cont ...
Pump Mounted Above Liquid Source (Suction Lift Installation)
The pumps can be used in a suction lift installation providing the height of lift is within the
limits specified in the limits of application section and the liquid to be pumped is cold water
(for applications other than cold water contact Stuart Turner).
Before deciding where to locate the unit, check to ensure the static outlet head (Fig. 10)
does not exceed the maximum requirements of 8 metres for the K7-2 model and 13 metres
for all other models.
A footvalve and strainer must always be used and the suction pipework size must match
the pump.
Lay the suction piping over the shortest possible distance and ensure there is a constant
rise from the liquid source to the pump. Any high spots will cause air pockets to form,
reducing system efficiency.
Ensure all joints in suction pipework are completely airtight. Failure to comply will result
in loss of prime.
The intake of the footvalve/strainer should be positioned such that it cannot be blocked
with debris or silt that are frequently found in the bottom of sumps and wells.
When a footvalve is installed in the suction pipework, it is recommended that suitable
pressure relief valve be fitted in the discharge (outlet) pipework from the pump.
Fig. 10
Diagram showing typical Pressure Control
installation with suction lift.
Max. inlet head (consult limits of application section)
Max. outlet head
13
m (except K7-2)
Max. outlet head
8
m (K7-2 only)
