Monday, Feb 03, 2014 at 22:11
The OP asked " What sort of pump would be suitable to say suck up water from a creek 3-4meters below the tank? Has anybody a system like that or similar?"
The pump I suggested is very suitable, for example at
home when I use it the pump is over 2 meters below ground level pushing through 30 meters of 3/4 inch hose and if I hold the outlet over my head giving about 5 meters of head the flow is easily over 1000 lph. It is designed to run open flow, no pressure switches as its not a constant pressure supply pump.
Gavin, I extended the power cable with 10 meters of 15 amp sheathed twin core Narva cable, it works a treat. I run it with the engine off, if you had a longer cable, just have the engine running to overcome the voltage drop.
There is also some confusion being thrown around, psi absolute v/s psi guage, pressure head and pressure as a restriction of flow.
Remember pressure is just the restriction to flow, whether that restriction is gravity or wall friction from undersized pipes. If you used a smaller hose the effective head would be lower.
Small diaphragm pumps are meant to provide low flow rates through small diameter pipes in a local system, perfect for tank to camper "domestic" supply. To fill bulk tanks, yes they can be used but at a higher cost and vastly slower rate.
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