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Potable Water - The Third Way.
On Sat, 29 Sep 2007 17:43:02 -0500, Brian Whatcott
wrote: On Sat, 29 Sep 2007 20:40:57 GMT, (Richard Casady) wrote: There is a reverse osmosis watermaker intended for liferaft use, with a hand pump, and RO takes hundreds of psi. That is what you want, if you actually need high pressure. Casady I looked up an example The Katadyn Survivor 35 hand pumped was formerly called the PUR Survivor 35 RO. At 30 strokes/minute for 1.2 gall/hr - it costs $1500. Calorie expenditure by the survivor(s) could be a problem here. The strokes for this RO unit can probably be performed by devising a simple hydraulic pump to move gears, cams, and levers. The pump cylinder itself would probably need an inverted U tube with legs perhaps 32' or 33' long. An initial vacuum might be applied to the top of the U-tube by using a fitting that can be connected to the PUR Survivor 35 RO. Once the water starts flowing through the vane at one end of the U tube, and the vane shaft is turning the gears, cams and levers will be clacking way, running that PUR unit on auto, good as gold. After that it's all gravy until you have to change the membrane. In the meantime you can spend your time fishing until rescued. --Vic |
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