1. #1
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    Question NFPA credits for 2.5"

    Okay, I had this all written out and explained but it timed out on me for reasons I won't get into.


    Basically- the NFPA credits 2.5" discharges at 250gpm rated flow. We currently have 500gpm rated Blitzfires pre-connected to a couple of 2.5" ports... are we going to be able to get 500gpm out of a discharge of that diameter or am I going to have to start looking at gating down some of our 5"?
    Ian "Eno" McLeod
    Senior Firefighter /EMT-A, A Shift
    HESD / OFD
    "To me, the charm of an encyclopedia is that it knows and I needn't."

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    I know when we do our yearly pump tests we hook up two 2.5 inch discharges into a master stream. We get over a 1000 gallons out of those two discharges so I'd would think you would be able to get 500 out of one. We're only running 50 ft of hose on each discharge so if you have a longer lay on your one 2.5 discharge, friction loss may come into play.

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    If your tank to pump plumbing is large enough to flow it, you should easily get 500gpm out of a 2.5" discharge.

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    It's a 3500gpm 8FG... so we should be good. What do the credits mean?
    Ian "Eno" McLeod
    Senior Firefighter /EMT-A, A Shift
    HESD / OFD
    "To me, the charm of an encyclopedia is that it knows and I needn't."

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    Quote Originally Posted by Eno821302 View Post
    It's a 3500gpm 8FG... so we should be good. What do the credits mean?
    It means that each size discharge is "credited" with a certain GPM rating, and the sum of all the discharge ports must meet or exceed the rated capacity of the pump.

    Can you tell us more about this truck? Maybe post some pics?

    Our Admin has expressed interest in a new Foam Pumper, and I'm suggesting a 3,000+ GPM pump for it. The 8FG caught my eye more than any other.

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    Give me a few moments on your request. As far as some minor details- here are the following specs.


    Pierce Lance cab / chasis
    500g foam / 500g water
    3500gpm 8Fg
    Husky 300 foam system
    Renegade 5000gpm roof cannon
    4 5" intakes
    3 5" discharges
    6 2.5"
    1 1 3/4 (transverse)

    We spent a significant amount of money on a heating package (working northern Alberta, Canada). Has hydraulic electric- and a good amount of storage capacity for task. We're running 1 3/4s for our smaller handlines and hopefully upgrading our 2.5 to 3 inch. Big water will be the order of the day for this rig.

    I'll see if I can find some photos and post them shortly. No complaints about the truck thus far- of course we've had our minor teething problems but then again we're in a pretty harsh working environment with few paved roads and lots (and lots- and lots) of dirt and debris.
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    Ian "Eno" McLeod
    Senior Firefighter /EMT-A, A Shift
    HESD / OFD
    "To me, the charm of an encyclopedia is that it knows and I needn't."

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    The NFPA formula is based on drafting and pump ratings, not from sufficient positive pressure, from my recollection. I also believe there is an allowance for hose friction loss, because I read something about that recently. I'll dig around.

    From your main pump discharges, youll easily move 1000 GPM through a 2 1/2" under the right conditions (large enough tank to pump, good supply source).

    We got 2200 GPM from our two rear tailboard 2 1/2" discharges (3" pipe) from a hydrant a few weeks back.

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    Hey thanks for clearing that up- I was a bit concerned I'd have to start jury rigging something to feed both our blitzes and the crossfire.

    Nice to know we can leave it the way it is.
    Ian "Eno" McLeod
    Senior Firefighter /EMT-A, A Shift
    HESD / OFD
    "To me, the charm of an encyclopedia is that it knows and I needn't."

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