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Thread: 1.25" Main Vs 1" Line

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  1. #1
    Network Engineer rmelo99's Avatar
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    Default 1.25" Main Vs 1" Line

    I have a 1.25" main line that comes into the house. It currently is soft(not so much) but not straight copper after the main shutoff. I want to replace this wavy 28' of piping from the main valve up.

    Main valve is a new ball valve so I'm not worried bout that, my concern more about is there a big difference between 1" and 1.25". I want to keep it at 1.25" but that size tubing is not as common and readily available and there is premium on it b.c of that. What am I losing if anything going down to 1"?

  2. #2
    In the Trades Gary Swart's Avatar
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    There is a significant difference between 1" and 1-1/4" pipe, figure the area of each with the formula, Pi (3.14) x radius squared and you can see. That said, 1" is plenty large enough for a normal household. Many homes has just 3/4". Now, if you are talking about a quarter of mile of pipe, then you would have to take friction loss into account, but that's only for an extremely long run.

  3. #3
    Forum Admin, Expert Plumber Terry's Avatar
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    Here is a nice chart for sizing

    http://www.terrylove.com/watersize.htm

  4. #4
    Network Engineer rmelo99's Avatar
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    Ok, thanks for the chart, looks like there are several reasons for me to not bush it down to 1".

    Need to check now if the meter is 3.4" or 1".

    I'm sure I can make do with 1" supplying the house but, I may in the near future install a sprinkler system, and I think I will need as much volume/pressure as I can. Correct?

  5. #5

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    1" should be more than enough for any standard house, even with an irrigation system.

  6. #6
    In the Trades Gary Swart's Avatar
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    I have a 1" line out of a 1" meter for my house and irrigation system and there is plenty of flow.

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