Who uses POLY for main line?

Discussion in 'Irrigation' started by jbell36, Oct 4, 2013.

  1. DanaMac

    DanaMac LawnSite Fanatic
    Posts: 13,156

    Older systems here were done in PVC and there is still the occasional one. Most systems here are now poly, and most companies will use poly for a mainline, if they do a mainline. And they rarely use a MV, and rarely is there a problem. The only time there is an issue is when the pressure regulator fails in the house, and pressure then spikes to 125-150. Then we will see the occasional blow out in EITHER poly or PVC if the main was done in Class 200.

    Not all pipes will crack from freezing. I have many customers that do not blow out their systems, and some have damage and some do not. When winterizing a system, my main concern is backflow preventer, manifolds, mainlines, and valves. Or if the system is all PVC or copper (yes we have some older systems that are all copper). The occasional split poly pipe or head is no big deal. It's the 20'-60' of shattered PVC that chaps my azz.
     
  2. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 46,463

    Systems components like heads and lateral lines don't ever get exposed to full static pressure, especially with a basement water meter fed from a pressure-robbing house supply line. The deal about valves and high pressure was more an issue for an old-school Richdel R204 valve, with an unsupported flat diaphragm.

    What brand(s) of poly pipe can you get?
     
  3. 30 plus years of installing residential systems and only came across a 1 system where it was used and of course, I didn't have parts. I had to go to Orchard Supply Hardware to get an insert to repair the pipe. Its PVC here west of the rockies.
     
  4. 1idejim

    1idejim LawnSite Fanatic
    Posts: 8,856

    I saw a brand spanking new poly system installed a few years ago in the great state of Jefferson. First I had seen here but sure enough, it was poly.
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  5. greenmonster304

    greenmonster304 LawnSite Gold Member
    Posts: 3,014

  6. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 46,463

    Same pipe you replace home supply lines with?

    It's an intriguing choice. The poly home supply lines I see are always CTS (OD specified) poly with waterworks compression fittings, and never IPS poly with clamped insert fittings. Upstream of the meter, it's entirely the purveyors' call on what gets used to connect the supply tubing.

    Have you ever checked with the vendor on what they recommend for connecting the 200/250 psi poly? I do believe the poly can reach a thickness and density/hardness where a worm gear clamp will not exert sufficient force to match the strength of the poly. Only a few of the Ideal brand clamps (marine-grade and Lox-On) claimed agency approval for use on the then-thickest poly (160 psi medium-density)
     
  7. Kiril

    Kiril LawnSite Fanatic
    Posts: 18,298

    I've seen a few poly systems, but they are few and far between.
     
  8. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 46,463

    You can sell a poly-system as earthquake-resistant :)
     
  9. grassman177

    grassman177 LawnSite Fanatic
    Posts: 9,795

    Basically,i hate poly. Won't use it. But to consider any system without a master valve is bad design,poly or pvc is not s determining factor on that....it's not even a question to have or not.

    That being said I work on several that are totally poly, and I noticed on the mainline side there are not one, not two, but three house clamps on every fitting. Something worthy to note
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  10. djagusch

    djagusch LawnSite Platinum Member
    from MN
    Posts: 4,170

    Main line 3 pinch clamps, zone line 2 pinch clamps that is what we do.
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