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connecting to galvanized steel

Discussion in 'Irrigation' started by crosson lawn, Apr 11, 2005.

  1. crosson lawn

    crosson lawn LawnSite Member
    Messages: 107

    I have a chalenge. without putting in a whole new system i have an old system that is run with 1/2 inch gal steel pipes in the yard. this is only one zone but it is run by a 6hp in-ground pump that can sustain 70 pounds of presure. i am gonna try to unscrew the vertical pipe from the 90 and install a tee. but if it breaks and i have to cut it before the 90 what would be the options?? i have seen the new funny pipe that is blue in color and has a connector that just is just press on. is there such a thing that will press onto the steel pipe. i also have seen this in copper. has anyone seen something that will help with this??
  2. stumper1620

    stumper1620 LawnSite Bronze Member
    Messages: 1,889

    we used to connect galv. to pvc with compression repair couplers.
  3. bicmudpuppy

    bicmudpuppy LawnSite Silver Member
    Messages: 2,781

    We used to thread galvanized pipe.........
    Oh, for you youngsters, they do make compresion repair couplings for galvanized too. Worse case scenario, you buy two repair couplers, one for galvanized and one for pvc and swap the rubbers to fit your situation. to make sure you have a way to anchor past the coupling though or it might blow out.
    If you know an "old" plumber, he might still have a set of cutting dies and re-thread the pipe for you.
    Any one else out there remember how to cut and thread galvanized swing joints? And can you still buy pipe dope? most heads still say "use no dope". I always read that to say no paste either and again for you youngsters, it's not an anti-drug slogan.
  4. jerryrwm

    jerryrwm LawnSite Bronze Member
    Messages: 1,274

    bic... I think the PVC and galvanized compression couplings are the same size. They are both IPS.

    Have threaded many swing joints in the past, then started buying threaded nipples. Not many remember that you make up the swing joint tight, and then back it off 1 to 11/2 turns.

    When they came out with those PVC swing joints with Acme threads, I thought it was Christmas time in July.

    Another old method - sweating copper shrub risers. Lay a dozen or so across the tailgate of the truck, turn the torch at an angle to preheat the next riser in line while sweating the previous. And I don't want to see any of those dripd or runs either.

    What about grey SDR-21 PVC made by Telsco. Still run across that in the grouns, and they quit selling it locally over 20 yrs ago.

    Jerry R

    Jerry R
  5. DanaMac

    DanaMac LawnSite Fanatic
    Messages: 13,187

    This may be what my technician found last week. Never seen it before, but is was gray, looked like PVC but VERY thin and brittle.
  6. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Messages: 50,267

    ..and buy one of their special compression fittings (coupling, male adapter, whatever fits your application) - they are a notch above standard compression fittings, with the means to externally grab onto the pipe, and prevent blowouts. With these in hand, you don't have to waste time trying to unthread old galvanized.
  7. YardPro

    YardPro LawnSite Gold Member
    Messages: 3,570

    i HAVE a pipe die LOL

    guess i am old.........

    a lot of the old mains we tap into here are galvanized
    i cut out a section, tap some threads then use a pvc expansion fitting with appropriate female thread fittings on each end.

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