Well pipe reality check

Discussion in 'Pumps and Tanks Well Forum & Blog' started by tbwampler, Jul 30, 2014.

  1. tbwampler

    tbwampler New Member

    Messages:
    2
    Hi all.

    I have a deep 8 year-old well (850'). Last week I started losing pressure and had the well guys come out. They tell me my galvanized pipe is leaking, and that it's not a big surprise. My water does have a pretty high iron content. They tell me I should expect to have to do this every 5-10 years or so, and that I can either keep using galvanized to do it (plastic isn't an option because it's so deep), or...I can shell out the money to use stainless and never have to worry about it again. Obviously there's a huge difference in the price of stainless vs galvanized and it adds up in a hurry when you're talking about a well this deep. I haven't seen anybody talking about using stainless in the forums, so I thought I'd throw it out here. Is it reasonable to expect galvanized to wear out that quickly? Is using stainless at all a sane option? Thanks.
  2. LLigetfa

    LLigetfa DIYer, not in the trades

    Messages:
    3,991
    Location:
    NW Ontario, Canada
    Most often, galvanized pipe will rust through at the threads because the coating is removed when the threads are cut. If the installer had the wisdom to wrap electrical tape over the threads, it would last much longer.
  3. craigpump

    craigpump Member

    Messages:
    945
    Location:
    ct
    Going along with what LL said, if the threads rust through at the threads and the string of pipe is lost in the hole, that would be a very expensive fishing job.

    Use stainless and be done with it.
  4. valveman

    valveman Moderator Staff Member

    Messages:
    4,469
    Location:
    Lubbock, Texas
    Or maybe just use Stainless for the bottom part that will be under water. Galvanized pipe that is up out of the water usually doesn't rust very bad.
  5. Reach4

    Reach4 Active Member

    Messages:
    2,270
    Location:
    IL
    No experience, but I was wondering if you might make the bottom part schedule 120 PVC and use your choice of metal for the top part?
  6. LLigetfa

    LLigetfa DIYer, not in the trades

    Messages:
    3,991
    Location:
    NW Ontario, Canada
    I had the same idea but then I'm no expert on 800 foot deep wells.

    Does anyone have a cost estimate for SS?
  7. Reach4

    Reach4 Active Member

    Messages:
    2,270
    Location:
    IL
    I was thinking that the weight of the drop pipe full of water would be the limiting factor. Now I am thinking that the pressure would be a limiting factor. I could envision stainless on the bottom (for pressure but rustproof), PVC in the middle (cheap rustproof), and galvanized up top (cheap tensile strength). I have not seen the tensile strength numbers for schedule 120 PVC with threaded couplers.

    pix4.PNG

    http://www.johnsonscreens.com/sites/default/files/literature/Male-x-Male Drop Pipe.pdf page 2 has this table.
  8. tbwampler

    tbwampler New Member

    Messages:
    2
    I am told Stainless goes for around 20 bucks a foot, at least five times as much.
  9. craigpump

    craigpump Member

    Messages:
    945
    Location:
    ct
    We install Sch 80 to 600' and run the system at 65psi all the time. Never have had a problem

    I know guys in Mass who hang 3 hp pumps on 600' of sch 80. But I wouldn't do it.........

    Montana, we get $4.59 for 1" galvanized around here, so if you change it 4 times you have almost paid for stainless.
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