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Question:

what kind of pump can pull water from 50ft away?

Theirs a house on a hill and a pond at the bottom of the hill what kind of pump can pull water 50ft up a hill?

Answer:

you could not, if that fifty feet is the vertical height. the optimal height a pump can suck water up is approximately 32 feet. that's constrained via the atmospheric tension and might't get replaced. One option is a pump on the backside interior the pond, pushing the water upwards. yet another is a jet pump, that may take a seat on the appropriate of the hill. It sends a jet of intense tension water all the way down to the pond, and that jet there pushes the water upwards. This must be primed, although. IF the 50 feet is in basic terms the slope distance up the hill, calculate or degree the vertical height, that's all that counts. .
You can not lift water by suction more that about 30 to 34 feet depending on the water's temperature. It will literally try to boil and the pump will lose suction. You can only push the water up the hill with the pump at are near the bottom of the hill.
None. Atmospheric pressure is equivalent to about 10m of water height = 30ft. When a pump pulls water (or any liquid), up a certain height of pipe, it does do by lowering the pressure. In a centrifugal pump (the most common type for handling water) the point of lowest pressure is the centre of the rotor (the eye of the pump). In order to pull water 10m up, equivalent to 30ft, the pressure at the eye of the pump would be 0, which is unattainable. Not only that, but the water will begin to boil at a certain low pressure determined by the temperature of the water. That pressure at which the water begins to boil determines the lowest pressure than can exist at the eye of the pump and is a critical design variable. There are several ways to circumvent the problem of pumping water higher than 30ft. One would be to install more than one pump, with one of the pumps half-way up the hill. The other would be to install one single pump, but to place it near the pond. There is a limit to how high a pump can PULL (suck) water, but there is no limit, other than the amount of pressure the pum can generate and the piping can handle, to how far up a pump can PUSH water. If you need to puch water higher, you can always buy a bigger pump.
A water suction style pump can only pull at maximum , 30 ft vertical (more like 25 with inefficiencies). You didn't specify if it was 50 ft vertical distance up the hill or just 50 ft from the pond on a grade with maybe a smaller than 25ft vertical height difference. If it is less than 25 you can use the cheap centrifugal pumps or diaphragm pumps located at the house. By far it is a better choice to use a pump at the pond to push the water uphill instead of pulling it. A cheap submersible sump pump (less than $70, for a 1/3 hp electric, like a Wayne or something) will pump uphill no problem and doesn't draw much current. If you want to keep the line continuously pressurized you will need a pressure tank in your house and a pressure switch to shut off the pump once it gets to predetermined psi setting If you have a true vertical 50ft distance you might want to install a positive displacement submersible pump in the pond. The more I think about it, the more I think a centrifugal pump (the cheapest design) would have a difficult time pumping 50 ft uphill. So go with a positive displacement style, the same type they put in wells. With the pump put directly in the water you don't have to prime the pump each time you start it either. These pumps do run several hundred dollars though

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