The depth that matters for pressure is the depth to the water in the well; not the depth of the well.
Depth to water at drawdown + friction loss + pressure in the tank (all converted to consistent units) gives you maximum pressure in the pipe.
Being an engineer unable to resist a challenge, here are a couple of ideas:
1. Use schedule 80 PVC with cemented joints. Hang the pump from a rope or cable so the weight of the pipe is supported in compression at the joints. The well casing will keep it from buckling. After a few hours, the pipe will support the pump.
2. Even schedule 80 pipe is flexible. I just tried bending a 10 ft length of 1" schedule 80 PVC and was able to get it to about a 6 ft radius, and it's 55 F here. I would try to rig up a support to feed the whole length down the well. Plan to allow for a 10 to 15 ft radius to make it easy.
Lay out the length that you are going to work with for a day and put it together. Then rig up a platform to stand on and feed it down the well after the joints cure. If space is a problem, you can cement it over a few days and store it in a 50 ft radius coil on the ground.
I would probably do the rope thing but either way should work.
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I'm about to pull up my old well pipes since I've lost prime and I suspect the foot valve has failed. It's a 40+ year old well and the depth is at least 100', maybe closer to 150', currently PVC. Instead of having to carefully pull out the old PVC without breaking it I'm thinking now's the time to switch to flexible pipe to make it easier to fix again later but I want to be sure I'm using the right materials.
This is what I'm thinking about using. It's an above ground pump, and I'm not 100% sure what the pipe diameter is as it's a vacation home so I can't check at the moment, but I'll confirm before I purchase. Is this the correct material for this application, assuming the diameter is also correct?
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