About the Bunyip Pump
ABOUT THE BUNYIP WATER-POWERED PUMP
The BUNYIP pump is a simple and compact unit that utilises the power of water to pump water.
- Environmentally Friendly
- Saves money & labour
- Self-regulates to changes in streamflow
- High efficiency
- Light Weight
- Straight forward Installation
- Simple to operate & maintain
- Pumps water without mains power or fuel
We build our pumps right here in Australia.
HOW THE BUNYIP WORKS
HOW MUCH WATER COULD YOUR SITE DELIVER?
This depends on three variables:
- Fall (supply head) in your stream (Metres)
- Stream water flow rate (Litres/sec)
- Vertical height (delivery Head) you want to pump (Metres)
Fall = 1000mm
Input = 6 Litres/second
Delivery Head = 50m
Expected Output = 4,600c Litres/24 hr
If this site's streamflow reduces to 2 Litres/second, the output will reduce to 1500 Litres/24 hr.
The letter next to the outputs represents that site's appropriate piston diameter size (c =60mm diameter).
Small pistons are like low gear & big pistons like high gear in a motor vehicle.
Note: We will determine your piston size as this information is just an overview.
Note: The downloadable output calculator takes piston sizes into account & recalculates the outputs, sometimes resulting in slightly lower outputs.
Approximately 2.5 times the PA-13 outputs due to their maximum input flow of 15 Litres/sec.
Approximately 30% of the PA-13 maximum outputs with outputs declining further for Falls below 1.8m.
With very low streamflows, it can sometimes be many minutes between "cycles".
YouTube shows numerous examples of BUNYIPS in operation.
BUNYIP VS FUEL-DRIVEN COST & LABOUR SAVING ANALYSIS
This basic list may help you see the difference. In most cases, it doesn't take long to see if it's viable.
Fuel driven pump cost factors:
- Cost of fuel-driven pump = ?
- How many times this pump needs to be replaced = ?
- Maintenance required = ?
- Fuel cost per volume pumped = ?
- Labour involved running & maintaining the pump = ?
- Does your pump need to be moved in times of
- flooding = ?
- Or possible damage to pump & environment if flooded = ?
- Initial Bunyip purchase = ?
- Note; the Bunyip is a lifetime low-tech machine not requiring replacement.
- Cost of BUNYIP installation = ? This cost would be the main cost to focus on as it will vary depending on the site.
- Note; a potential big saving may be possible because, in most cases, the BUNYIP only needs a 25mm diameter delivery pipe (or Line). E.g., You can pump 5000 Litres/day over a 5km distance with 1” (25mm) Poly pipe to a 100m head with minor pipe friction losses.
- Cost of maintenance; generally $20 to $50 AUD worth of stock rubber piston & rod seals to be replaced between 6 months (rare) to two years (common), depending on conditions & only a 15 min job.
- An example of how low tech the Bunyip is these seals can even be made from leather though rubber has little less friction.
- After doing these calculations/estimates, you may find you can farm areas that would otherwise be unfeasible without a BUNYIP.