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Old 11-01-2008, 12:49 PM   #31
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Well pump control box delema


I wonder how they were using this pump previously. It was the house supply until I tapped county water. My well is very deep? But as I said before I can see the water with a flashlight. When the pipes fell in they must have hit bottom as the pipes are still visible.
Why would I have a 350' deep well with a above ground pump. I am in SC. Upstate. Near mountains. I would think I am hundreds or thousands of feet above sea level? Does that have anything to do with the well depth?

I think I have jet pump. It has two pipes. A large and a smaller one.

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Last edited by J. V.; 11-01-2008 at 12:51 PM.
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Old 11-01-2008, 01:44 PM   #32
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Yours is indeed a two-pipe jet pump system. I forgot to mention that the well pipes are different sizes. The smaller one is the pressure pipe, and the larger one is suction. 1-1/4" and 1' are common sizes.

The deepest jet pump I've seen was about 100'.

There's a bit of difference in performance in deep wells between submersible and jet pumps.
A 1-1/2HP submersible pump in a 20' well operating at 40PSI discharge will produce about 25GPM (Gallons Per Minute). A 1-1/2HP jet pump will produce about 18GPM.
The submersible pump in a 100' well will produce about 20GPM. The jet pump in the same well is good for about 2-1/2GPM.

The submersible pump (just the pump, nothing else) will cost about $700. The jet pump will cost about $450. The submersible pump will need a control box ($130), the jet pump does not. The submersible will need wire going down the well ($ varies widely, figure a couple hundred including the splice at the motor), the jet pump does not.

The easiest way I know of to find the depth of a well is to tie a 16 oz. water bottle onto a string (a masons line will do). Drill a hole in it up near the cap, so there's no way the string can come off. Fill it about 1/2 full with water. Lower it into the well, and it'll be obvious when it hits the water. The string will get much lighter. Don't forget to mark the string at the top of the well. This is not exact, but it'll be within a few feet.

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Old 11-01-2008, 01:47 PM   #33
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Well pump control box delema


Rob,.

The deep well I did work on not too long ago it kinda oddball set up but the motor is above the ground and the impeller in the well as you descrbing and instering twist with this well set up.

This set up there is a gear box between the motor and well shaft due in case of power failure we can get a tractor PTO to hook up and run the water pump. { it do happend from time to time.} { this well have 100 HP motor on it.

not too long ago I installed a stand by generator and it did elemated the useage of tractor but the water dept told me to leave the gear box in for good reason.

Merci,Marc
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Old 11-01-2008, 01:53 PM   #34
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I've seen a few of those lineshaft pumps with a vertical shaft electric motor on top of the gearbox, and a diesel engine connected to the shaft on the side. I've also seen them with a horizontal shaft out of each side. These had a diesel on one side, and a standard-frame electric motor on the other.

Pretty good set-ups, either one will run the pump.

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Old 11-01-2008, 02:47 PM   #35
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Rob,
Shouldn't I be looking for the bottom of the well and not the top of the water line. There is a foot valve down there I think. I thought you were suppose to let it go all the way down, then bring it up a couple feet.
If I don't get it all the way down, when the ground water level drops my valve would/could be sucking air.
I am going to measure how deep the well is and try to get the pipes pulled back up on Monday.

My plan is to dig down a few feet against the well and penetrate the concrete pipe. Then trench (8') over to the basement wall and penetrate that wall. Bring both pipes into the basement where I will build a frame for the pump motor, and tank. Then pipe in a bypass valve to switch between utility water and well water. Do you think I should install a one way valve near the pump or rely on the foot valve in the well.......Appreciate your feedback.......John
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Old 11-01-2008, 04:17 PM   #36
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Putting the foot valve at the bottom of the well then raising it up a few feet is a good idea, my water bottle test was to get a rough idea of the depth of the well so you could choose the type and HP of pump.

The foot valve at the bottom of the pipe will hold water indefinitely. Don't put a check valve anywhere on the suction side of the pump, except at the bottom of the well. The shaft seal in the pump is designed for pressure, not vacuum. Your system sounds pretty good. You'll need a pressure tank of some sort. If you irrigate, you'll find the well water to be much less costly than municipal.

By code, anything that has the ability to push water back into a municipal system must have a backflow prevention valve. The type you'd put on a lawn sprinkler system will work.

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Old 11-02-2008, 10:55 AM   #37
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Thanks Rob. I have the tank, pump motor and pressure switch stored in the basement.

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