Poly questions

Discussion in 'Irrigation' started by PerfiCut L&L, Aug 13, 2010.

  1. PerfiCut L&L

    PerfiCut L&L LawnSite Senior Member
    Posts: 458

    I hear a lot about how effecient poly is to install, so were going to try it on our next install but I have a couple questions.

    What kind of reel holder or other method have you found to be efficient when pulling this stuff?

    Secondly, the friction loss chart I have on this poly 80 psi product says 1" tops out at 12gpm at 4.45fps. Is this right? S Sure limits the amount of rotors running on a single zone doesnt it?
     
  2. CAPT Stream Rotar

    CAPT Stream Rotar LawnSite Fanatic
    Posts: 5,857

    have a guy un roll the pipe..

    Use inch and a quarter and then T to 1 inch..

    either way how many rotors you getting off 12 gpm?
     
  3. WalkGood

    WalkGood LawnSite Bronze Member
    Posts: 1,910

    I'd only use 100 psi poly at one inch, as a minimum. The *safe* range is 12 to 14 gpm.

    What size water meter and supply pipe from that meter?
     
  4. AI Inc

    AI Inc LawnSite Fanatic
    Posts: 25,155

    I could have sworn 1" poly carrys about 3 gpm more then a 1" valve will pass, no?
     
  5. CAPT Stream Rotar

    CAPT Stream Rotar LawnSite Fanatic
    Posts: 5,857

    we have put 18 gpm through 1 inch poly..

    yes there was hammer.
     
  6. AI Inc

    AI Inc LawnSite Fanatic
    Posts: 25,155

    Dont have charts here or the desire to go hunting but I thought poly carries 21 and a 1" valve will pass 18
     
  7. AI Inc

    AI Inc LawnSite Fanatic
    Posts: 25,155

    BTW cappy , sorry to hear about the misses.Keep ya chin up, or down , depending on the activity.
     
  8. WalkGood

    WalkGood LawnSite Bronze Member
    Posts: 1,910

    One inch poly *will* carry much higher gpm, but things will be screaming like a banchee and hammering like a truck hit the house. That is, if you have the volume and pressure available for it to work properly.

    But why push it?

    At a typical residential site around here, 5 rotaries max on 1 zone of 1 inch poly is 99% of the time all you need. Maybe 6 if there are many 1/4 turns and/or smaller nozzles.

    Sure, there are many residential sites with more heads on 1 inch poly.

    If available pressure and volume drop in the future, then all those heads will just be spitting.
     
  9. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 46,464

    I have one system where a section of one-inch poly carries almost fifty - count 'em - fifty gpm. Of course, no valves are downstream of the section, which passes underneath a walk and a raised bed.
     
  10. WalkGood

    WalkGood LawnSite Bronze Member
    Posts: 1,910

    Does the sidewalk vibrate like a bed at the Commack Motor Inn? [​IMG]

    ;):dizzy:
     

Share This Page