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Tool Talk Discussion Forum

500 PSI from well pump ?

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Craig

01-15-2004 18:38:49




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what is the maximum pressure that can be obtained from a 3/4 or 1 HP submersible well pump? The pump would only be lifting the water about 5-10 feet. Do you think i would be able to get 400-500 PSI or more at about 3-4 GPM? Im thinking it may be possible considering that my 1/2 HP house well runs at 181 PSI (60 PSI in tank, 121 PSI to overcome 280 foot well) Of course the pressure would go higher if it was not turned off by the pressure switch.

In case your wonding, Im trying to get 400-500 PSI. i was thinking that i could put a well pump in a tub of water and possibly reach that pressure. Of course there are other ways to do it, but used well pumps are cheap ($10-$30)

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Chris Brown

01-16-2004 04:45:27




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 Re: 500 PSI from well pump ? in reply to Craig, 01-15-2004 18:38:49  
I played around with a submersible well pump,we have a shallow (dug) well and I put a 1/2 hp pump and let it run open ,it could be choked down with a valve up to about 300 psi,but wth it choked down to that kind of pressure there was nearly no flow,maybe 1 or 2 gpm. For washdown I use a 3.5 hp clear water pump,it has 1.5 " in and out and like 3000 gph.
.I drop the suction in the pond and the high flow low pressure seems to do as good as low flow high pressure of a power washer. I have one of those too and use them both but they both have their advantages.

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Farmered

01-16-2004 04:08:44




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 Re: 500 PSI from well pump ? in reply to Craig, 01-15-2004 18:38:49  
You won't get 500 psi from any centrifugal pump. You would have to go to a positive displacement pump (piston) which is designed for high pressure.
Why don't you use a pressure washer? Remember that the volume will decrease as the pressure increases. Ed (Mech. Engineer)



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buickanddeere

01-16-2004 05:38:15




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 Re: Re: 500 PSI from well pump ? in reply to Farmered, 01-16-2004 04:08:44  
A single stage centrifugal well pump will really start loosing flow above 50psi and is pretty well done at 75psi. Will centrifugal pumps make 500+psi pressure, yes no problem. Even a single stage with enough impeller tip speed from rpm and/or diameter will go even higher. Should see the multistage heat transport water pressurizing pumps at work where normal output is 1800psi running 24/7. As for deep well pumps, they are not created the same even if it's the same manufacture and 3/4HP. The shallow submersed pump has fewer stages, more flow and less pressure. Deep well submersibles have several pumping stages in series. Enough to build pressure to shove the water 300+ feet up plus build tank pressure. Pressure at the expense of flow and efficiency. Each stage has friction/pumping losses

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rhudson

01-15-2004 19:10:02




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 Re: 500 PSI from well pump ? in reply to Craig, 01-15-2004 18:38:49  
well, from pump theory (hp x 1715)/pressure=gpm it would work. but from a pratical standpoint, i'm thinking you would have to go to a multi disk pump. if you could get your hands on the pump curves for the model you're going to use, you could hit the nail on the head. try goulds net site. also i guessing that you are going to cross a safety point if you go that high with a common pump. is your water level in you well actually at 280 feet? or is your well that deep total.

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Craig

01-15-2004 19:20:47




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 Re: Re: 500 PSI from well pump ? in reply to rhudson, 01-15-2004 19:10:02  
The water level on my well is something like 200 feet. pump is at 280. I have run it dry before, so i figuered that before it ran out it was pumping from 280 feet, but I suppose the water could have stopped because the pump couldn't pump from that depth, even if there was still water.


whats a multi disk pump? is that a well pump? are they common? If they are not common, I don't think i could get a used one too cheap (as in less than $100) Otherwise i could just scrap the whole idea of a using a well pump to make high pressure and use a pressure washer pump($$$). Or, another idea- How long would a power steering pump be able pump water before it dies?

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buickanddeere

01-16-2004 13:14:36




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 Re: Re: Re: 500 PSI from well pump ? in reply to Craig, 01-15-2004 19:20:47  
Wouldn't it be cheaper in the long run, operate properly,reliably,safely, have soap injection and have a warrenty. Just by watching sales and purchasing a ceramic piston high pressure washer? Or attend estate auction sales for bargains on little used equipment?



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rhudson

01-15-2004 19:43:41




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 Re: Re: Re: 500 PSI from well pump ? in reply to Craig, 01-15-2004 19:20:47  
Hi Craig, muli disk if probably jargon for multi-impeller. the first impeller would go from suction pressure to maybe 150 psi, the outlet of this would go to the second impeller and boost to 300 psi then into the third and boost it to the 500 psi. from the outside, the pump would look near the same. its going to cost. if you have a grainger catalogue, look under booster pumps. grainger catalogue is on the net. to go from suction pressure to very high pressures requires a very large diameter impeller or many little impellers in stages. i've installed the booster pumps in industries to get city pressure up to around 200 psi at around 10-50 gpm to do washdowns of chemical tanks. but not as high as the 400-500 psi you want. my gut feeling is that the steering pump thing is not a good way to go, low gpm and a very short life. once i made a pressure washer from the cheaper two piston water pumps (around $149) (lent it to someone, have not seen it for a while)

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