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  • CAFS Nozzles

    (For some reason Search isn't turning up any responses on this topic)

    Just looking to see what various departments are using for tip sizes on their 1 3/4" and 2" CAFS lines. It seems that many use 15/16", with 1/2" for wet foam and 1 1/4" for dry foam, while others just use a bare 1 3/8" ball valve with no tip.

    What tip sizes do you use for each consistency/application, and what air/water ratios do you run?

  • #2
    We use a 1" nozzle in a Akron single shut off Saberjet nozzle for normal firefighting situations which give us a good wet foam mixture at .3% setting. I dont think there is a set ratio of air/water as long as you use more water than air for firefighting and more air than water for exposure protection. We ussually run close to twice the water gpm than air cfm's. Then gate down to more air than water for exposure protection, for a good thick foam and try to use a 1 1/4 - 1 1/2 nozzle. We use 1 3/4" hose line @ 150' - 200'.

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    • #3
      Hi BlitzfireSolo,

      Here are a few links that should answer your nozzle questions and others.

      Be Safe,

      Capt. Lou
      "GOT FOAM?"



      http://forums.firehouse.com/showthread.php?t=56163
      http://forums.firehouse.com/showthread.php?t=67653
      http://forums.firehouse.com/showthread.php?t=55342

      Comment


      • #4
        I use an 1 1/8th tip for reach and a wetter foam. Then take the tip off an use an 1 3/8th ball shutt off for dryer foam.

        When using a tip make sure it has a nice smooth cone with out step in it. Also take out the built in stream shapeners that can be found in the Elkhart and I believe POK nobs.

        I wouldnt use anything smaller than 1".
        "Never share a foxhole with anyone braver than yourself."

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        • #5
          We also use Akron Sabrejet nozzles on 1 3/4" handlines for CAFS. We run 1" tips in all of them. We make all of our adjustments on the pump panel. We run 2:1 (Foam solution/air) for dry foam and 3:1 for wetter foam. For structural firefighting we run the the foam at .3% and 3:1. For structural protection we run 2:1 and .5% to .8% foam. We also have one 2 1/2" CAFS preconnect with a playpipe and stacked tips and a 2 1/2" CAFS preconnect with a TFT Blitzfire and stacked tips.

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          • #6
            Akron Saberjet with a 15/16 bore. Seems to be working good for wet foam. Maybe someone can answer a question.....Why does a ball valve make drier foam?

            Thanks,

            Stay Safe

            Comment


            • #7
              WRFDTO,

              "Maybe someone can answer a question.....Why does a ball valve make drier foam?"

              You must understand that what is flowing in the hose during a CAFS operation are millions of tiny, uniformed air bubbles with water being carried on each.

              Any nozzle that pops some or all of the "bubbles" will make the final end product wetter. As the "bubbles" pass thru the 15/16" tip or a tip that is much smaller than the hoses internal diameter, bubbles are popped and the stream is much wetter. That is why you can't flow dry foam (shaving cream) from 7/8" 15/16" or 1" tip on an 1 /34" handline. To make the dry, shaving cream type foam you must use a "Quality" foam concentrate, make the proper adjustments at the pump panel and use an "open bale" with an 1 3/8" ball in it. All this combined will make perfect shaving cream because the drier “bubbles" are not being popped.

              Hope this helps.

              Be safe,

              Captain Lou
              "GotFoam?"

              Comment


              • #8
                [QUOTE=CaptLou]WRFDTO,

                Any nozzle that pops some or all of the "bubbles" will make the final end product wetter.


                Good Answer Captain Lou.

                also, I hate to see the SaberJet connected to a CAFS unit. You might as well be using a very small CAFS unit and I have seen some departments even turn down the pressure trying to reduce the increased velocity of the foam thats forced through the small opening. What a waste of foam. Full flow is ALWAYS best, just close the ball valve a little does the same thing to strip some of the bubbles back into wet water. Use more than 1/2 percent (.5%) concentrate and set your pressures at 120 on the water and the air. Use your gloved fingers for a fan pattern in close fire fighting and use a short section of hard hose to prevent kinking near the nozzleman.
                Mark Cummins

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