Twin Impeller or Single Impeller Firefighter?

This is possibly the single most misinformed subject that we come across in our business(apart from the one where a smaller pipe gives more pressure). So often we have customers coming to us with the intent of buying a twin impeller firefighting pump. When we ask why, the answer is always "Because you get more water don't you."

Don't you?

Well, maybe you do. And maybe you don't. Ask yourself this: Is a 4WD faster than a 2WD? It certainly is up a muddy steep climb or through a boghole. But probably not for a trip to town.

So let's take a closer look. What is an impeller? What does the twin impeller do?

Impellers are the spinny thing at the heart of your pump. As it spins it draws water into its centre and throws it out through its vanes, creating both pressure and flow. They come in lots of different diameters and widths and can spin at different rates. The diameter of an impeller will affect the pressure while the thickness will affect the flow rate. Extra impellers, in series, add pressure to each other, but do not increase the flow rate (in fact the flow rate decreases). So a twin impeller pump will deliver higher pressure but lower flow.

So, which pump do you need?

Take a look at the pump curves below. The single impeller pump delivers better flow rates below 40m of total dynamic head, while the twin impeller delivers more above 40m. So for general purpose pumping a single impeller pump will generally suffice. However for high pressure situations the twin impeller pump will be the best choice. Don't forget the pipe friction. In some situations the pipe friction will add up so that the total dynamic head is greater than 40m.

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Pumpmaster Gusher Moves Some Serious Water

This job required a quick and simple solution to dewater a gravel pit. Our client wanted a pump system that was light and easy to move but with enough performance to get the job done quick and fast. The solution was the Pumpmaster SEH100 pump powered by a Honda GX240 (8HP) petrol motor. This little beast moves upward of 1000 litres per minute and will empty this pit (its 9m deep!) in a day or two. Not pictured is a "Mussell" foot valve assembly which will ensure that gravel and sand will not enter the suction and foul the pump.
Our Number One Pump Gun, Snowy, loves these jobs. They make him feel manly and powerful.

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Specials for August/July

SPECIALS

JULY & AUGUST ONLY

First Flush Diverters 90mm –

Were $68 Now $48

Aussie Pumps QP 5.5HP Honda Firefighter

Was $1085 Now $880

Pumpmaster JP81 0.6kW House Pump

Was $620 Now $510

19mm Drip 300m Coil Pressure Comp

Was $1012 Now $680

Twin Undersink Water Filter System

Was $273 Now $220

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AUSSIE EXTENDS 5 YEAR WARRANTY

Australian Pump Industries, Australia’s leading self priming centrifugal pump specialist, has extended it’s unique 5 year warranty coverage to include the range of Aussie Poly Pumps.

The Poly Pump range, 2” and 3” pumps manufactured from high tech polyester materials, are used in a wide range of aggressive liquid transfer applications in industrial, agricultural and marine market sectors.

“When we saw cheap Chinese copy-type products coming out on the market, we realised that the best way to differentiate copycat style products to the original, was by extending our warranty” said Dean Fountain. “We know that low quality Asian copies will never be able to follow us down that path” he said.

The Aussie Poly Pump range is widely used in the transfer of aggressive liquid fertilisers, digestive aids for farm animals, and in the transfer of pesticides and herbicides in agricultural markets. In industrial chemical transfer, the pumps are used to handle acids, solvents, oil based products and even for the transfer of potable water, brine and condiments.

The versatile Aussie Poly pump is also used in a wide range of marine applications.  Because of their hygienic design quality, they are ideal for live fish water circulation, and for general aquaculture duties.  The Aussie Seamaster is based on the 2” and 3” Aussie Poly Pump.  The Seamaster is a lightweight diesel drive portable pump used in marine applications for both fire fighting and salvage duties.

The Aussie Poly pumps are available in close coupled single or three phase electric drive, hydraulic drive for mobile applications, and in their most popular form, Honda petrol engine or Yanmar diesel engine driven versions.

The reason these pumps suit such a wide range of applications is because the seal and elastomer kits are available in EPDM, Viton and Buna N.  For extremely aggressive applications, pumps can be supplied made from polypropylene, Ryton and Halar.

“The quality controls in production are so strict, and our assembly standards at Australian Pump are so high that we’re quite confident about offering an extended 5 year warranty at no extra charge to users,” said Fountain. “Our ISO9001 quality certification demands the highest standard of assembly, testing and responsiveness to customer needs” he said.

“The 5 year warranty’s effective immediately and extends the normal Aussie Poly Pump pump end warranty by 4 years.  The increased warranty helps consumers make an informed decision about an important product acquisition, whether it’s an industrial or agricultural application” said Fountain.

Further information on the complete range of Aussie Poly Pumps including a free catalogue is available on the Australian Pump website (www.aussiepumps.com.au) and from Aussie Pump Distributors throughout Australia.

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