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Water Meter Question

Discussion in 'Irrigation' started by AssuredServicesCo, Feb 18, 2006.

  1. AssuredServicesCo

    AssuredServicesCo LawnSite Member
    Messages: 113

    I've looked at a few water meters and see 5/8 shown on the top of the meter on a line, and others with 3/4 down on the side of the meter near the center. I've determined the 5/8 is for it's size (duh), but does the 3/4 on the side of others also indicitive of it's size. Thanks. I'm a licensed irrigator but have to learn some things like this from field experience. Input is appreciated.
  2. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Messages: 50,214

    Once upon a time, there was actually 5/8 inch copper pipe. I think the 5/8 water meter was sized accordingly. Maximum rated flow was 20 gpm. There were also 3/4 inch water meters, with a maximum flow rating of 30 gpm. Obviously, water hammer and flow velocity didn't figure into these ratings. The 3/4 inch meters were larger and longer than 5/8 meters. Even though the 5/8 copper pipe is now an extreme rarity, the meters remain, with 3/4 inch threads. And now, there is a sort of hybrid water meter, that has the 30 gpm flow rating of the 3/4 inch meter, in the smaller 5/8 package. Sometimes, they're designated as 3/4 x 5/8 water meters. On occasion, you can get an older 5/8 water meter swapped out for a 3/4 x 5/8 meter, and gain some extra pressure in a sprinkler system.
  3. Dirty Water

    Dirty Water LawnSite Fanatic
    Messages: 6,794

    Every meter out here is 5/8"

    All you guys with 1" meters are crazy :laugh:
  4. AssuredServicesCo

    AssuredServicesCo LawnSite Member
    Messages: 113

    so how do you know the difference between the two water meter sizes, thanks
  5. bicmudpuppy

    bicmudpuppy LawnSite Silver Member
    Messages: 2,781

    I think you already answered this part of the question. The size is stamped on the meter. I've never seen the hybrid 3/4 x 5/8 boots is talking about, but after some time, a 5/8 meter looks like a 5/8 meter without cleaning it up to find the size stamp. A 3/4 meter gives you slightly more flow, but in most residential settings, I don't think you will get enough difference to justify a significant change in design.

    Jon, when you only water six weeks out of the year, I understand why you think 1' meters are eccentric, but if you need the water twice a week for 10-14 weeks, the extra flow is kind of handy.
  6. Hank Reardon

    Hank Reardon LawnSite Senior Member
    Messages: 599

    If memory serves, Jon gets about 10" of precipitation a year [in Sequim] and that's all between November and April! :eek:
  7. PurpHaze

    PurpHaze LawnSite Fanatic
    Messages: 5,496

    By that reasoning then we should be using 3" or 4" water meters since our watering season is longer and some large systems are watering six nights a week. :laugh: (And I say this as it's pouring down rain outside.)
  8. Dirty Water

    Dirty Water LawnSite Fanatic
    Messages: 6,794

    Your about right.

    Though we got a record 6" in january alone. Yuck.

    Though we work out of Sequim, we'll service everyone in about a 50-75 mile radius (Port Angeles, Port Townsend, even out West to Forks), and sequim is just a dry spot on a very wet peninsula.
  9. bicmudpuppy

    bicmudpuppy LawnSite Silver Member
    Messages: 2,781

    LOL, Not exactly how I meant it, but funny the king of 3+" mains replies :) And I thought western Washington was all in a 40+" / year. My mother-in-law calls it "Washington" weather everytime we have a wet period in the spring or fall. I wouldn't dream of watering about 25% of my sites with a 3/4 or smaller meter, but I have some 20+ zone systems on 1" meters too.
  10. Dirty Water

    Dirty Water LawnSite Fanatic
    Messages: 6,794

    It was in the teens at night this week, and mid '30s during the day.

    But that is unusually cold.

    The weather is why I stay in Sequim, that and the small town feel.

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