1. #1
    MembersZone Subscriber

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    Nov 2007

    Default Elevation Pressure

    what are the implications of back pressure and forward pressure,when the nozzle is above or below the pressure source.

  2. #2
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    firemonkey311's Avatar
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    Nov 2007


    Add 5 psi for every 10-12 feet of elevation up. Subtract 5 psi for every 10-12 feet of elevation down.

    10 feet because that works if your trying to guess elevation if say your on the pump and the truck is in the road and the house is down in a hole or your going to the basement of a residential house.

    12 feet cause thats the average ceiling height of a commercial building.
    Hello. Fire dept.. You light'em, We fight'em!

    "hard working, gear jamming, nail driving, "jake". "

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  3. #3
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    MemphisE34a's Avatar
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    Jan 2004
    Memphis, TN - USA


    We don't really worry whether its 9 or 11 foot floors. We figure + or - 5 psi per floor period.

    Simple question to answer Trooper. Get in the books a little. Answers you have to find yourself are often remembered.
    cell #901-494-9437

    Management is making sure things are done right. Leadership is doing the right thing. The fire service needs alot more leaders and a lot less managers.

    "Everyone goes home" is the mantra for the pussification of the modern, American fire service.

    Comments made are my own. They do not represent the official position or opinion of the Fire Department or the City for which I am employed. In fact, they are normally exactly the opposite.

  4. #4
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    DeputyChiefGonzo's Avatar
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    Aug 2000
    Somewhere between genius and insanity!


    It's + or - .434 per foot of elevation or descent for below ground levels, if you want to get technical... 5 psi + or - per floor works for me!
    ‎"The education of a firefighter and the continued education of a firefighter is what makes "real" firefighters. Continuous skill development is the core of progressive firefighting. We learn by doing and doing it again and again, both on the training ground and the fireground."
    Lt. Ray McCormack, FDNY

  5. #5
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    Sep 2006
    Northeast Coast

    Thumbs up

    Quote Originally Posted by MemphisE34a View Post
    Get in the books a little. Answers you have to find yourself are often remembered.
    Oh how true! It seems much to often we go to FH.com to ask questions that we should be looking up.

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