Wallace Gnome Centrifugal Pump – Discontinued
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Description
Wallace Gnome Centrifugal Pump – Discontinued
If you’re searching for the Wallace Gnome centrifugal pump in New Zealand, please note that this model and spare parts for this model are no longer made. We keep this page to help folks who might be looking for info on their old Gnome pump. If you need a replacement or a modern water pump solution, get in touch with us here in NZ – we can point you to up-to-date options that suit your needs.
About the Wallace Gnome Pump
The Gnome was a reliable centrifugal pump designed for home water supply in New Zealand. It was great for moving hot or cold water, or even brine. Many used it to transfer water from underground tanks to roof tanks for gravity feed. You could run it with a simple manual switch or make it automatic with a float switch.
As a centrifugal pump, it ran very quiet with no hammer, pulse, or shake. It could handle up to 3,400 litres per hour whisper quiet.
Specifications
- Pump Parts: Brass volute, impeller, and back plate, machined for smooth running. The volute could be set in four positions to change the delivery spot.
- Connections: Suction and delivery threaded externally 3/4″ B.S.P., internally 1/2″ B.S.P., or plain.
- Seal: Mechanical gland with carbon face and neoprene gasket that adjusts itself for wear. No wear on the motor shaft, and the shaft doesn’t touch the liquid.
- Motor: Split phase induction type, 2850 RPM, Class E insulation. Ventilated drip-proof design with BS170 rating. Ball bearings for long life without oiling. Impeller fits direct on the tapered spindle. Built-in thermal overload protection with reset button.
- Fastenings: Brass and cadmium plated steel.
Performance
The Gnome pump delivered based on this curve:
- At 0 litres per minute: 12 metres head (40 feet)
- At 11 litres per minute (2.5 gallons): about 11 metres head
- At 22 litres per minute (5 gallons): about 10 metres head
- At 34 litres per minute (7.5 gallons): about 8 metres head
- At 45 litres per minute (10 gallons): about 6 metres head
- At 56 litres per minute (12.5 gallons): about 4 metres head
- At 68 litres per minute (15 gallons): 0 metres head
Note: 1 metre = 3.28 feet, 1 gallon = 4.546 litres.
Operating Instructions (from Circa 1984)
General
Don’t run the pump dry, or it might damage the seal.
Installation
Keep suction lift under 15 ft vertical. Use a short vertical priming pipe if needed. Fit a foot valve for suction lift. Avoid air pockets, sharp bends, and long lines. Use same size pipe as the flanges.
Priming
Remove the priming plug until water flows bubble-free. For flooded suction, it self-primes, but check the plug to let air out. Close tank line before priming.
Starting
Turn on power. If no water in seconds, stop and check troubles.
Troubles
- No water: Reprime, check lift and leaks, direction of rotation.
- Flow stops: Air in pump or line, high lift, worn seal, blocked parts.
- Noisy: Obstruction, bent shaft, binding parts, worn bearings – needs expert fix.
- Capacity fall: Air leaks in suction or gland, suction drop, blocked line or grain.
- Pump noisy: Solid bits in case, bent shaft, worn bearings.
Maintenance
Keep lines clean. Replace leaking gland via serviceman. Motor bearings last years. If motor trips often, check for issues like waterlogged tank. Fix by draining and re-admitting air. Higher suction lift reduces max pressure: flooded gives up to 28 lbs, 15 ft lift down to 20 lbs.
Questions?
If you have any questions, don’t hesitate to contact us for help with finding the right product or variant for your application. If you are local, pop into our store to have someone assist you in finding the right sized pump for your set up. We are located at 72 Kioreroa Road, Whangārei 0110. If you are not local and have a question, you can fill out the form below or give us a call.
Additional information
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