fuuny pipe or larger diameter risers-does it matter

Discussion in 'Irrigation / Sprinkler Forum' started by danmich177, Jun 18, 2007.

  1. danmich177

    danmich177 New Member

    Jun 18, 2007
    I am installing a irrigation system and am wondering if I can use funny pipe connections on 3/4" rotor heads or should I be using a larger diameter riser such as a swing joint or straight cut off riser? Will the riser diameter significantly affect the pressure/flow to the rotor?

    Some sites/threads I have read recommended only using funny pipe on 1/2" rotors or sprays.

    Also should you mix and match different types of risers in a single zone or would it be better to stick with the same diameter risers on all the heads?
  2. Gary Swart

    Gary Swart In the Trades

    Sep 1, 2004
    Yakima WA
    I use 1/2" funny pipe to connect all of my sprinklers. It's much easier to set the sprinklers at the right depth and to adjust them later if/when necessary. Less likely to break pipes if you step or drive on them too. You'll get plenty of flow to your sprinklers.
    Last edited: Jun 18, 2007
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  4. jimbo

    jimbo Plumber

    Aug 31, 2004
    San Diego, CA
    Funny pipe is small, but I think a short section is still adequate for 1 head, even a 3/4 inlet rotor. The GPM of that rotor is probably not so high that the short piece of funny pipe would affect you much.
  5. Kiril

    Kiril New Member

    Jun 19, 2007
    Sacramento, CA
    I use the right sized swing joint for the sprinkler on all my systems, unless for some reason funny pipe is the only thing that will work. If your sprinkler has a 3/4" connection (like a PGP rotorary), then use 3/4" pipe with a 3/4" swing riser.
  6. Mr_Pike

    Mr_Pike New Member

    Jun 28, 2007
    I would say it really depends on what nozzles you are installing into the heads in question.

    Most quality rotor heads have a 3/4" inlet. If you are running a high capacity nozzle like 8 + Gallons per Minute, then I would recommend a 3/4 inch riser or 1/2 inch pipe swing joint. If you are 6 GPM or below, the carrying capacity of the funny pipe will not effect the head at all.

    I also reccommend as above using funny pipe on most if not all of your head installations. It will make repairs and maintenance so much easier in the future should you decide to move a head because of landscaping changes, or adding even an additional head to the zone. If you zone has the capacity, you should be able to run multiple heads on one section of funny pipe if need be, as long as you stay below the total capacity of the funny pipe output.
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