Stuart Turner Jet Pump 45 - Manual (Page 7)

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2.26 Self Priming: Jet 55-45 and 80-45 pumps are capable of self priming the suction
hose assembly, providing a footvalve and strainer (not supplied) is always used
for this type of installation. The Jet pump can be used in a suction lift installation
providing the height of lift is no greater than maximum permitted (Fig. 3).
2.27 Footvalve/strainer: It is important that the optional footvalve and strainer is
always used for suction lift installations.
2.28 Suction pipe: Lay the suction piping over the shortest possible distance and
ensure there is a constant rise from the water source to the pump. Any high
spots will cause air pockets to form reducing system efficiency. The suction hose
must be a minimum of 25 mm to ensure the pump is not starved of water and
must be reinforced to prevent it collapsing.
2.29 Connections: Ensure all joints in suction pipework are completely airtight.
Failure to comply will result in loss of prime.
2.30 Position: The intake of the footvalve/strainer should be positioned so that it
cannot be blocked with debris or silt that are frequently found in the bottom of
sumps and wells.
2 LOCATION - PUMP MOUNTED ABOVE WATER SOURCE (SUCTION LIFT
INSTALLATION)
Fig. 3
Max. suction lift 5 m
0.5 m min
Ensure inlet area
around strainer is
free from debris