Upsizing to 1"

Discussion in 'Irrigation' started by RollTide, Apr 27, 2013.

Thread Status:
Not open for further replies.
  1. RollTide

    RollTide LawnSite Member
    Posts: 97

    My meter is 3/4 and so I used all sch40 3/4 for my install. If I had upsized to 1" for the install would it have increased the gpm and allow more heads per zone? Am I at the mercy of the size of the meter? Btw, this is city water in a residential hood on lots 3/8-1/2 acre.

    Thanks,
    Steve
     
  2. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 47,020

    Likely the upsize would have meant more available flow, and shorter watering time. (and no, you can't upsize the meter and get the same result)
     
  3. Kiril

    Kiril LawnSite Fanatic
    Posts: 18,298

    Maybe ..... maybe not, but a bigger pipe would mean less pressure loss.
     
  4. RollTide

    RollTide LawnSite Member
    Posts: 97

    Thanks for the replies. So, I would've had more flow but would I have less pressure? Wouldn't there be a pressure drop?
    Posted via Mobile Device
     
  5. Kiril

    Kiril LawnSite Fanatic
    Posts: 18,298

    You may or may not get more flow volume.

    pressure loss in pipes is inversely proportional to size.
     
  6. MostWantedLandscape

    MostWantedLandscape LawnSite Member
    Posts: 15

    The meter is a small bottle neck. Up sizeing to 1" in this situation will increase volume. The pressure loss is minimal. On the other side of that 3/4" meter is a 8" water line. The biggest problem will be the water velocity in the bottle neck, which is minimal.
     
  7. RollTide

    RollTide LawnSite Member
    Posts: 97

    Oh! Ok! I gotcha! Thanks!
    Posted via Mobile Device
     
  8. Kiril

    Kiril LawnSite Fanatic
    Posts: 18,298

    On the other side of the meter is a 3/4" tap, most likely 3/4" copper tubing. How much volume can 3/4" copper tubing carry at a safe velocity?

    Really? How much? Are you sure it won't just reduce flow velocity and pressure losses?
     
  9. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 47,020

    This is a crock, pure and simple. The meter could increased to infinity, and it wouldn't make up for the hundreds of feet of 3/4-inch pipe already in place.

    Compared to pipes in a system, a water meter has no appreciable flow limit, so long as it's identical in size to the plumbing going in and out. A 3/4-inch meter is rated for a 30 gpm flow. There's no way the sprinkler system is using 30 gpm, or even half that.

    All you get from installing a meter larger than the plumbing it's set in, is a few psi in increased pressure. Changing the 3/4 to a 1 gives you less than a 5 psi increase, since the 3/4 meter didn't represent a significant pressure loss in the first place.
     
  10. MostWantedLandscape

    MostWantedLandscape LawnSite Member
    Posts: 15

    I'm not going to argue! Best thing for you to do is some real world testing. I've been doing it for 20 yrs+ and I've yet to have a volume/velocity problem up sizing from 3/4" to 1".
     
Thread Status:
Not open for further replies.

Share This Page