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Old 04-27-2013, 11:03 AM
RollTide RollTide is offline
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Upsizing to 1"

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
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Old 04-27-2013, 11:15 AM
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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)
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Old 04-27-2013, 11:20 AM
Kiril Kiril is offline
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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)
Maybe ..... maybe not, but a bigger pipe would mean less pressure loss.
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Old 04-27-2013, 11:25 AM
RollTide RollTide is offline
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Thanks for the replies. So, I would've had more flow but would I have less pressure? Wouldn't there be a pressure drop?
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Old 04-27-2013, 11:28 AM
Kiril Kiril is offline
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Thanks for the replies. So, I would've had more flow but would I have less pressure?
You may or may not get more flow volume.

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Wouldn't there be a pressure drop?
pressure loss in pipes is inversely proportional to size.
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Old 04-27-2013, 12:16 PM
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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.
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Old 04-27-2013, 12:26 PM
RollTide RollTide is offline
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Oh! Ok! I gotcha! Thanks!
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Old 04-27-2013, 12:34 PM
Kiril Kiril is offline
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On the other side of that 3/4" meter is a 8" water line.
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?

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Up sizeing to 1" in this situation will increase volume.
Really? How much? Are you sure it won't just reduce flow velocity and pressure losses?
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Old 04-27-2013, 12:59 PM
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Originally Posted by MostWantedLandscape View Post
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.
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.
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Old 04-27-2013, 01:00 PM
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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".
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