Stairs ST SERIES Installation And Operating Instructions Manual

Submersible

Deep Well Pump

4”/6’’ ST SERIES

INSTALLATION AND

OPERATING INSTRUCTIONS

These Instructions must be delivered with the pump to the operator.

WARNING: Failure to follow these instructions and comply with all applicable codes

may cause serious bodily injury and/or property damage.

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Installation & Operating Instructions

It is important that all submersible deep well pumps be installed by experienced persons and that all electrical connections
comply with the relevant electrical supply authority requirements.

The electrical connections and checks must be made by a qualified electrician and comply with
applicable local standards.

These instructions are provided for guidance only, and assume a familiarity with submersible pump installation and
commissioning procedures.

Bore Conditions

1. To guard against installing a pump in aggressive or abrasive water, it is suggested that an analysis of the bore water
be submitted to an authorised testing authority prior to installation of the pump. Damage to the pump or motor caused
by abrasive or aggressive water is not covered by the guarantee. The water analysis parameters listed below are
intended as a guide only as various combinations of the below items and others may act as a corrosive fluid:

PH - 6 to 8
Total dissolved solids (PPM) - 1,000 maximum
Chlorides (PPM) - 500 maximum
Fe (PPM) - 2 maximum
C02 (PPM) - 50 maximum
O2 (PPM) - 2 minimum
ST4” Sand content - 150 g/m³ maximum

ST6” Sand content - 60 g/m³ maximum

WATER QUALITY: The above guide is NOT an indication of safe drinking water. A water analysis for this
purpose should be undertaken.

2. Know the approximate replenishment rate of the bore before selecting a pump. Select a pump with a

maximum of 10% less discharge than the replenishment rate of the bore.

3. Where bores are sunk into aquifers comprising of sand or fine gravel, it is important that they be

adequately screened to prevent the ingress of these materials into the water being pumped. It is also important that
the bore be cleaned prior to the installation of the pump, and that the pumps must not be used for “bailing” or
developing the bore.

4. In the event that the water is entering the bore from a level above the pump (“a cascading bore”), or where the pump is

installed in a large diameter bore, or in a river or other open water sources, a shroud may be required over the pump
to ensure that all water being pumped is drawn over the full length of the motor’s surface. Minimum water velocity past
a motor for adequate cooling should be 0.08m/sec @ 20oC water temperature.

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5. To assist in protecting the integrity and quality of your bore water supply we suggest a bore cap be fitted to the top of

your bore casing at all times. This may also assist pump installation.

Coupling the pump with the motor

NOTE: Before coupling pump to motor ensure pump and motor models are as specified.

For ease of transportation and to minimise potential transport damage, Stairs 4” submersible deep well pumps are
supplied in component form, ie. motor and liquid end boxed separately. For correct coupling, proceed as follows:

- Remove cable guard after removing the lock screws.

- Insert a screwdriver into the shaft end to ensure the pump is free to rotate. Some small resistance is normal.

- Position the pump and motor so that they are aligned along the same axis.

- Insert the motor shaft into the pump coupling, using the screwdriver to rotate the shaft to align the coupling to the

motor shaft.

- On each motor stud fit the four nuts which secure the pump to the motor, tightening them a little at a time in

a diagonal sequence.

- Align the motor cable along the pump, then secure the cable guard with the setscrews into the side of the pump.

CAUTION: BE SURE THE MOTOR KW SIZE IS EQUAL TO (OR EXCEEDS) THE MOTOR KW REQUIRED FOR
THE PUMP.

Ensure the motor voltage & phase matches the supply voltages & phase.

Installation

NOTE: FOR SEALING OF PIPE THREADS ONTO YOUR STAIRS SUBMERSIBLE DEEP WELL PUMP USE
THREAD TAPE ONLY. DO NOT USE PIPE SEALING COMPOUND AT ALL.

1. Drop Pipe

All pipe and fittings must be suited to the maximum pressures available from the pump.

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 can be obtained and 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