1. #1
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    Default Water demand for sprinklered buildings

    Can anyone tell me a formular how to calculate the water demand for a sprinklered building?

    Thank you

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    I believe that one 750 or 1000 gpm pumper is required for every 50 sprinkler heads in use. Not sure about the psi though. Dont know if that would help.

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    I am looking for the sprinkler system water hose demand allowance.

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    Water hose demand allowance? Not familiar with that term, if you could clarify please. Rule of thumb as USAFFF04 was pointing out is one 1000 GPM pump for every 50 heads pumping at 150 psi unless otherwise noted by the system. Hook up to the FDC with two medium hoses (2 1/2 or 3") or one LDH (5").

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    Quote Originally Posted by USAFFF04
    I believe that one 750 or 1000 gpm pumper is required for every 50 sprinkler heads in use. Not sure about the psi though. Dont know if that would help.
    am I the only one that looked at your name and read it as US AFFF 04 and then wondered why one would name themselves after AFFF?
    When I get to hell
    The devil he will say
    "How'd you put my fires out?
    In just one day?"
    I lift my hose up higher and higher
    that's how I do it, I'm a firefighter!

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    When I went through my Fire Safety Inspector training, I recall being told that in most sprinkler systems, once 12 sprinkler heads have opened, the system will fail because the GPM output has exceeded the capacity of the piping to supply the water, no matter what the PSI is.
    Richard Nester
    Orrville (OH) Fire Dept.

    "People don't care what you know... until they know that you care." - Scott Bolleter

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    Coolfire,

    If I have found what you're looking for try NFPA 13 chapter 7. Brew a pot of coffee before you open the book.

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    cgerdes97
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    Quote Originally Posted by Spectre08
    am I the only one that looked at your name and read it as US AFFF 04 and then wondered why one would name themselves after AFFF?
    i believe he meant USAF FF 04... united states air force firefighter. but i could be wrong, some people just like AFFF, that's their thing.

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    Thumbs up

    yes sir I am a firefighter in the air force and I joined the military in 2004. I am currently at Little rock AFB.

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    What's LRRS?

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    Quote Originally Posted by USAFFF04
    What's LRRS?
    that answers that question
    When I get to hell
    The devil he will say
    "How'd you put my fires out?
    In just one day?"
    I lift my hose up higher and higher
    that's how I do it, I'm a firefighter!

  12. #12
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    Don't know the exact formula, but I believe the general rule of thumb is to pump at 150psi, then add 5psi for every floor you have to pump up to. For example, if the fire is on the second floor you would pump at 155psi, if the fire was on the third floor you would pump at 160psi, ect.

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