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2 zones on 1 pipe

Discussion in 'Irrigation' started by bobw, Apr 28, 2007.

  1. bobw

    bobw LawnSite Senior Member
    Messages: 807

    I've got a bit of a head scratcher that I'd throw out to you all.

    I went to do an estimate for a woman a couple of days ago. The front yard is elevated and surrounded by concrete and block retaining walls. When whoever built this, they tucked a 3/4" poly line through the back wall and down to "ground" level.

    Now the front yard is fair enough sized and is part grass and part shrub beds. I explained to the homeowner that I would normally like to have two zones for this, one for the lawn and one for the beds, but because we only have one line, and we're not about to rip the walls apart, we'd be stuck with one zone.

    So... long story short, she wants me to do the install, but she said one of the other companies she'd called told her that they could do the front with two zones, no problem and that they'd pull lines through the 3/4" poly. So, she figures I should be able to get two lines to the front.

    What do you think this company plans to do to get two zones up there? You sure as heck can't fit 2 1/2" lines through a 3/4 line, in fact, I doubt you could even fit 1 up there and a control wire and have two zones on 1/2" lines.

    I'm completely stumped by what this company thinks they can do. So... what do you think their plan is?:confused:

    BTW.. I think that I'm going to tell this person to go with somebody else regardless... her yard is a PITA to do, and I'm virtually booked out for the season anyway, so I won't really be losing any revenue....
  2. Dirty Water

    Dirty Water LawnSite Fanatic
    Messages: 6,794

    Convert the 3/4" line to mainline and run control wire?
  3. ed2hess

    ed2hess LawnSite Fanatic
    Messages: 14,452

    Simply go under the wall.....we went under 5 walls on one job we just finished, especially since the poly is there and if it is embedded in the wall drill a bigger hole with Home Depot rental tool.
  4. bobw

    bobw LawnSite Senior Member
    Messages: 807

    That would be my initial thought, but how are they getting the control wire up there?
  5. bobw

    bobw LawnSite Senior Member
    Messages: 807

    The poly runs under the wall and comes up on the raised area. There is about 5 feet of height difference involved.
  6. bobw

    bobw LawnSite Senior Member
    Messages: 807

    In reflection, I've had a couple of thoughts, but none that seem reasonable...

    1) Find the low end of the pipe and couple a fresh piece on, tape a control wire to it. Use the original pipe to pull the new pipe in place along with the control wire. This would leave you a 3/4" pipe and wire at the top. I ruled this out because they way the original is looped in, and the 5' of dirt adding weight, makes it seem very unlikely that you would have the strength to pull it through and that the pipe would hold against the tension

    2) Find an indexing valve and use that as a cheater way to get 2 zones on top. I don't know if anyone would be able to find an indexing valve around here. The only one I've ever seen was in a thread on this site.

    3) Pull 1/2" poly and control wire through the 3/4" line and build out the zones on a very limited amount of water. I don't know if a 1/2" poly line will fit INSIDE a 3/4" line....

    lets keep the ideas coming... it is a very intriguing problem and I'm curious to see what others' thought processes are on it.
  7. Dirty Water

    Dirty Water LawnSite Fanatic
    Messages: 6,794

    Use two nelson Solo Rains, or be more creative with the control wire.

    Run it under eaves, through basements, whatever it takes.
  8. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Messages: 50,571

    There is a variation on the indexing valve that's known as a 'toggle valve' - those would work on a single line, and no wires required.
  9. CAPT Stream Rotar

    CAPT Stream Rotar LawnSite Fanatic
    Messages: 6,193

    battery operated valve?
  10. Remote Pigtails

    Remote Pigtails LawnSite Senior Member
    Messages: 581

    This may be one of the few times an indexing valve is a good idea. I strongly doubt your competitor has thought of this. Also it would defeat the bed/grass zoning advantage since both zones would have to run the same program. He may not have figured out how he is going to do it either and plans to cross that bridge when he gets to it.

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