Spigot PSI pressure

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Cygarbuff, Aug 7, 2009.

  1. Cygarbuff

    Cygarbuff New Member

    Joined:
    Nov 7, 2004
    Occupation:
    Auto Glass Installer
    Location:
    Tewksbury, Ma
    What should the standard pressure be for an outdoor spigot? I have three and two are between 90-95 and the one in the driveway (most important one for washing cars) is only 40. It's ok for getting dirt off my hands. Is this normal?
     
  2. TedL

    TedL New Member

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    Sep 17, 2006
    Location:
    NY Capital District
    If you're talking static pressure (without water running) they should all be the same if they have the same supply. So, how and under what conditions are you measuring?

    That said, 90 is high, higher than most toilet, washer, etc. manufacturers specify, and more than needed.

    Is ther a pressure reducing valve on the premises?
     
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  4. jimbo

    jimbo Plumber

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    Aug 31, 2004
    Location:
    San Diego, CA
    Out here , it is not unusual for one or more bibbs to be taken off BEFORE the pressure regulator, and others after. The way water come in to the houses, it is usually the front bibb on hi, and the back yards bibbs on lo.
     
  5. Gary Swart

    Gary Swart In the Trades

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    Sep 1, 2004
    Location:
    Yakima, WA
    Unless there is a pressure reducing valve in the supply line prior to the hose bib, the pressure will be whatever your city water main's pressure is. 90 psi is too high for household appliances, but would be fine for a hose bib. If the bib with 40 psi does not follow a PRV, the pipe could be restricted. However, static pressure where no water is flowing would be the same regardless of pipe size or restrictions.
     
  6. Cygarbuff

    Cygarbuff New Member

    Joined:
    Nov 7, 2004
    Occupation:
    Auto Glass Installer
    Location:
    Tewksbury, Ma
    There is a reducing valve in the house as the pressure coming in from the street is high. All appliances and shower and faucets are just right. As well as those two hose bibs (side and backyard) the driveway one is the one at 40. I jave a pressure reading gauge I screwed onto the sill to give me those readings. I would like more pressure but wanted to double check as I did not know what was normal
     
  7. Gary Swart

    Gary Swart In the Trades

    Joined:
    Sep 1, 2004
    Location:
    Yakima, WA
    It would appear that the bib with the 40 psi branches off the main supply line after the PRV. You need to understand that static pressure, the pressure you get when you put the gauge on the bib with no water being used, is not affected by a small pipe, clogged pipe, or faucet partly closed. Those factors would affect flow or volume, but not static pressure.
     
  8. Thatguy

    Thatguy Homeowner

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    Aug 27, 2008
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    A bounty hunter like in "Raising Arizona"
    Location:
    MD
    "Code Maximum is 80psi.

    In any installation where the static head pressure exceeds 80psi, whether the excess is constant or intermittent the homeowner is required to install a PRV (pressure reducing valve) to limit the water pressure to not more than 80psi.

    Ref:
    International Residential Code IRC 2903.3.1
    Uniform Plumbing code UPC-608.2"

    I think 30 was the minimum.
     
  9. Gary Swart

    Gary Swart In the Trades

    Joined:
    Sep 1, 2004
    Location:
    Yakima, WA
    He has a PRV for the household water. It's the one hose bib that has less pressure than he wants. He does not want to change the inside pressure.
     
  10. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Joined:
    Sep 2, 2004
    Occupation:
    Retired Systems engineer for defense industry.
    Location:
    New England
    Your only choices are raise the PRV outlet pressure some to everything else in the house, or replumb that hose bib so that it branches off before the PRV.
     
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