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V8 Technical Details

FREQUENCY OF START:

The average number of starts per day over a period of months or years influences the life of a submersible pumping system. Excessive cycling affects the life of control components such as pressure switches, starters, relays and capacitors, plus splines and bearings. Rapid cycling can also cause motor overheating and winding failures.

The pump size, tank size and other controls should be selected to keep the starts per day as low as practical for longest life. The maximum allowable number of starts per 24 hour day, are shown in the table below.

Motors should be allowed to run a minimum of one minute to dissipate heat build up from starting current.

USE OF CHECK VALVES:

All KIWI PUMPS submersible pumps are fitted with a check valve. It is recommended that check valves be used in all submersible pump installations. A check valve should be installed in the discharge pipe within 7 metres of the pump, if the built-in check valve is not used.

Immediate motor or pump failure, or shortened service life can be the result of the following conditions:
Backspin: When no check valve is used or when a check valve becomes defective, the water in the drop pipe can flow back down when the pump stops. This back flow can keep thrust on the motor while it comes to a stop which can cause excessive thrust bearing wear.

Up thrust: When no check valve is used or the valve leaks the pump starts each time at no head. Many pumps exert an upward thrust on the impeller stack at low heads which can lift the rotor of the motor until the developing water column causes down thrust. Repeated up thrust at each start can cause wear and failure.

Water hammer: If the lowest check valve is more than 9 metres above the bore water level, the weight of the falling water column draws a vacuum or evacuates a void below the check valve when the pump stops. On the next pump start, water moving at a high velocity fills this void and strikes the closed valve and the stationary water in the pipe causing a hydraulic shock. This shock can split pipes, break joints or damage the pump and motor.

PUMP MOUNTING POSITION:

Motors are suitable for operation in mounting positions from vertical shaft to horizontal. If 4 inch motors are started more than 10 times per day, it is recommended the shaft be tilted up at least 15° from horizontal to minimise coast-down wear of the up thrust washer.

TECHNICAL DETAILS V8:

Pump Type

Motor

Pump Stages

Dimensions(mm)

Pump Weight

Motor Weight

Total Weight

KW

HP

Ø

LA

LB

LT

ØDM

ØE

ØP

ØD

V-3-2

0.50

10

1.00”

V-3-2

0.75

15

1.00”

V-3-2

1.00

20

1.00”

V-3-2

1.25

26

1.00”

V-3-2

1.50

30

1.00”

# Due to continuous efforts in improvements, information furnished above is subject to change without notice

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