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Thread: Sub pump 370' down on poly pipe?

  1. #1
    DIY Junior Member coyote's Avatar
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    Default Sub pump 370' down on poly pipe?

    My 1.5 Hp sub pump is hanging on 370 feet of 1.25" galvanized pipe. It will need replacing soon, and I am interested in installing the new pump with polyethylene roll pipe and a stainless cable so that I could possibly remove it myself with a winch instead of having to employ the two guys and a crane. Has anyone done such a deep well that way, or does it really have to be rigid, threaded pipe? I could go to a smaller pump (I have 12,000 gallons of storage) and 1" pipe, I suppose, to reduce the weight. I am assuming the weight would be born by the cable, maybe 3/16"... Thanks for any replies.

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    General Engineering Contractor ballvalve's Avatar
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    I would use 200 psi pipe and extra long barb fittings not of plain steel. Let the pump hang on the pipe and keep the cable for backup.

    You need RATED ss clamps for torque and quality and lots of them. Heat the pipe only with hot water to insert.

    Check dean bennet supply online and graingers for clamps.

    much smaller pump sounds good.
    Last edited by ballvalve; 06-05-2011 at 10:32 AM.

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    In the Trades Texas Wellman's Avatar
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    I really like sch 80 pvc, which is rated for 900 psi and much stronger than the black poly pipe. What is your water level?

    Either way, I would forget the cable as it's just something else that can come loose and jam the pump in the casing.

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    General Engineering Contractor ballvalve's Avatar
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    For the homeowner, poly is a lot easier... [built on the surface] Even if he drops it, its not lost

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    In the Trades Texas Wellman's Avatar
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    You know I don't care for poly but even still, pulling 300+ feet of poly, cable, and pump, all full of water, will still be a chore, even with the poly. I'm seeing pumps lasting 10-20 years, is the poly that big a deal that is has to be able to be pulled by hand, once every decade or two?

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    Moderator valveman's Avatar
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    370' of 1" poly full of water will weigh 236#, add 150# for pump and wire and the total will weigh 386#. If you have a high static water level, buoyancy will take about half the weight off. I have a 220' well with a static of 4'. I can lift the whole thing with one hand, and I nearly have to push the pump back down the hole.

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    DIY Junior Member coyote's Avatar
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    Quote Originally Posted by ballvalve View Post
    I would use 200 psi pipe and extra long barb fittings not of plain steel. Let the pump hang on the pipe and keep the cable for backup.

    You need RATED ss clamps for torque and quality and lots of them. Heat the pipe only with hot water to insert.

    Check dean bennet supply online and graingers for clamps.

    much smaller pump sounds good.
    I was wondering how you grip poly pipe to attach a cable if you are lifting it, say 10 feet a a time, and have to keep reattaching the hoist cable. It seems the pipe would squash very easily...

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    DIY Junior Member coyote's Avatar
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    The water level is down at about 350'. So I definitely would need a hoist of some sort.

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    Moderator valveman's Avatar
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    Thats when it is better to use sch 80 PVC, have a nice hoist truck, a little experience, and maybe some insurance.

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    In the Trades Texas Wellman's Avatar
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    I also have a 200' well with the pump set at about 180' on sch 80 PVC. The water level is less than 20 ft. I can barely lift the pipe up. Glad I have the hoist.

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    DIYer, not in the trades LLigetfa's Avatar
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    Quote Originally Posted by coyote View Post
    The water level is down at about 350'. So I definitely would need a hoist of some sort.
    200 PSI poly would be cutting it too close at that level. You would have 160 PSI just in the weight of the water, plus whatever working pressure.

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    DIY Junior Member coyote's Avatar
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    Well (no pun intended), I guess it looks like the truck and crew are the way to go...But I always like a challenging project and usually do all my own building, plumbing, electrical, mechanicing, etc. Thanks for all the replies.

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    General Engineering Contractor ballvalve's Avatar
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    Quote Originally Posted by LLigetfa View Post
    200 PSI poly would be cutting it too close at that level. You would have 160 PSI just in the weight of the water, plus whatever working pressure.
    He has 12000 gallons of storage so we may assume NO pressure except the head, and 200 PSI poly can be driven over by a truck and take about 600 psi to begin to think about bursting.

    I think a couple of gorillas can still pull it, we have done 350'.... If not, his cable with a rigged up roller and guide can be lowered and raised by a prius or a garden tractor.

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    DIY Junior Member coyote's Avatar
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    Actually, there are another 25 feet of head to the top of the tanks--so 400 total feet of head if the water level gets down near the pump. Did you pull that 350' with just hands? Hey Ballvalve, do you know Mark and Penny by some chance? They are music friends of mine in Northfork.

  15. #15
    General Engineering Contractor ballvalve's Avatar
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    Yes, by hand. but you can clamp the pipe with a block of serious wood with a barely undersize hole - no squash.

    Did they ever play with that violinist girl from El Portal? There was a musician in North fork that had an artist wife but I think they were smart enough to sell and move before the crash.

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