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Compressed air powered water pressure
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[QUOTE="Baluncore, post: 6287397, member: 447632"] I think you need to avoid compressing air to run a water pump. There should be little need to pump air to pressurise the system once it is operating. As an example. Start with a 6 m³ pressure tank/accumulator. Introduce water when available at pressure to the mid-height point of the tank, through a ballcock and non-return valve. Remove water when needed from the bottom through a float valve that closes to prevent the escape of air if the tank runs empty of water. Pressurise the tank once with air to the minimum water pressure required. Then allow the tank to half-fill with water from an available pressure supply, until the ballcock closes. That will double the air pressure in the tank. As water is used the pressure will fall back to the minimum. The cost is going to be the large volume high pressure storage tank = a cylinder with spherical ends. There is another source of water pressure available. Pay local labour a premium when needed, to operate a pedal powered water pump that maintains water pressure in a small accumulator. Are you near a 2 bar = 20 metre high hill? That would eliminate compressed air and the tower, replacing it with a low pressure tank and a single long pipe. Air pressure is then not required. [/QUOTE]
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