Davey 4 Submersible Borehole Pumps SERIES J - Manual (Page 3)

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- Where supplied, fit the stainless steel suction strainer.
- Replace the check valve or check valve poppet and retainer.
CAUTION: BE SURE THE MOTOR KW SIZE IS EQUAL TO (OR EXCEEDS) THE MOTOR KW REQUIRED FOR
THE PUMP.
Installation
NOTE: FOR SEALING OF PIPE THREADS ONTO YOUR DAVEY SUBMERSIBLE BOREHOLE PUMP USE
THREAD TAPE ONLY. DO NOT USE PIPE SEALING COMPOUND AT ALL.
1. Drop Pipe
Polythene drop pipe may be used, providing the pressures and do not result in operating pressure which exceed
the pipe rating.
The starting torque of the pump motor tends to give a twist which could cause the pump shell to rub against the inside walls
of the bore casing - especially if rigid PVC or polythene pipe is used. Torque stops may be installed to dampen this twisting.
2. Safety Cable
As a precautionary measure, a safety line should be connected to all pumps regardless of the type of drop pipe
used. This line should be fastened to the pump and at the top of the bore casing.
3. Depth of Installation
For the maximum allowable submergence consult the motor specifications from the motor supplier. Ensure that the
pump is installed at least one (1) metre, preferably 3 metres above the bottom of the bore, and one (1) metre below
the maximum draw down level.
WARNING: If during the initial operation the pump lowers the bore water level down to below the suction inlet it will
be necessary to lower the pump, where feasible or install a level probe protection device to prevent the pump from
running under aerated water conditions.
4. Check Valve
All Davey submersible borehole pumps are supplied with a check valve, and no additional check valves are
required for open discharge conditions up to a maximum of 80 metres head. For installations greater than 80
metres head, or when used as a pressure system, it is recommended that an additional check valve be fitted
approximately no more than 60 metres vertically above the pump and every 60 metres vertically thereafter. The
fitting of this check valve will limit potential water hammer and consequent pump damage.
Ensure the motor voltage & phase matches the supply voltages & phase.
All pipe and fittings must be suited to the maximum pressures available from the pump.
NOTE: OVER PUMPING OF THE BORE (AERATED WATER) WILL CAUSE DAMAGE TO PUMP AND OR
MOTOR NOT COVERED BY GUARANTEE
Before lowering the pump unit, smooth out any rough spots or sharp edges on the top lip of the bore
casing to prevent damage to the pump or power cables when lowering the unit into the bore.