shallow well pump


Old 05-20-01, 03:28 AM
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Maybe someone can help me on this one. I have a shallow well that I use to fill the pool and water the lawn etc.
Not for in home use. The well I drove in 18ft7" about 20 years ago. The 1-1/2" galvanized pipe comes up to about 2'-0" below grade. then I installed an elbow, Than a one way valve.(I did not istall a footvalve)than a 10'-6" horizontal run, than another elbow up to 18" abouve grade to the pump. The entire system is outdoors and fully exposed to the weather, I put the pump and pressure tank indoors in the winter and drain the horizontal pipe.
This year when I installed the pump(new last year) I can't seem to draw the water up and out. When I first conncet the pump I fill the horizontal pipe and prime the the pump, over the last 20 years I 've had to prime the pump 2 maybe 3 times to get the system up and running, this year I I primed the pump maybe 30 to 40 times with just the prime water getting pumped out of the pump, the prime water in the horizontal pipe isn't getting picked up. I checked the obvious, (like did my granddaughter but something in the pump over the winter that might be causing a blockage)
I see nor hear any air leaks on the supply side. When I prime the pump for the first time every year I don't hook up the pressure tank and outlets untill the pump is plowing clear water. The new pump is 1/4 hp smaller than the old one I used for the last 20 years.
That's about all the information I can give you at this time.
Am I missing something.
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Old 05-20-01, 06:54 AM
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A. Shallow well pumps are made to pull a max of 25', and you're pulling over 30'.
B. You have a 20-year-old point.
C. You have an old check valve.
D. You use the well only part of the year.
E. You have stepped down from a 3/4-hp to a 1/2-horse pump for the first time this year.
(I think that this is correct.)
Any of the above could cause your problem.
The first thing that I would look at is the check valve. How old is it? It could be crudded shut with iron or minerals. Inspect and replace it , if necessary.
If the check valve is o.k., the next thing that I would try is to go back to a 3/4-hp pump. The more powerful pump is probably why you haven't had any problems with the 30'.
If a good check valve and 3/4-hp pump won't get it going, a 20-year-old point may be clogged up or the well could have collapsed around it.
If this seems to be the case, you may have to re-drive a new well.
However, I suspect the 1/2-horse just isn't going to do it, due to all of the above, and you need to go back to a 3/4.
Good Luck!


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