The immersion depth should not exceed 80m for the smaller
1phase pumps and 150m for larger pumps and be atleast 3m
above the borehole bottom
L1.
Immersion depth below static water
level
Fig. 5 Borehole Measurements
L5
L4
L1
L2
L3
L6
Ÿ
Pumps can be installed either vertically or horizontally,
though if installed horizontally the discharge outlet should
never fall below the horizontal plane. For all horizontal
installations a flow sleeve should be used and also there
should be a minimum of 0.5m water depth above the pump
to prevent the formation of a vortex.
Ÿ
If the pump is installed in a well or in open water with no
water flow past the motor it is important that a flow
sleeve is fitted to enhance motor cooling.
Not
Allowed
Fig. 5 Pump Axis Limits
Allowed
WARNING
Never allow the pump to operate dry, without water.
If a plastic delivery pipe is used a steel or nylon rope to hook
the pump is required during lowering and lifting.
WARNING
ii) Pump Position
Borehole Measurement Parameters
L2.
Depth to dynamic water level (DWL)
L3.
Depth to static water level (SWL)
L4.
Draw down. This is the difference
between the dynamic and the static
water levels
L5
.Installation depth
L6.
Distance of pump from well bottom
4
7
NOTE
