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Fog nozzles have better penetration than smoothbores?

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  • #31
    Originally posted by CaptainGonzo
    water, dry chem. dry powder, CO2, Halon (gotta cover all the bases!
    You know, I don't think I've ever seen a thread titled "Dry Chem vs. CO2, which is better?" lets start one just for fun!!! I bet we could get a few regulars worked up on that one! hehehe
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    • #32
      My response

      Just thought i would add my thoughts here. When i started 8 yrs ago it was the combo tips on everything. Now it has gone to smoothbore, so with my experience of using both I find each has it's place. When you are at your initial attack into a building you must go in with a smoothbore. It's knock down power is just incomparable with a combo. Something else I notice is something that the training academy's and vol. depts need to watch for. When someone new is going in and they are carrying a combo tip they forget to check it or are just to hyped to remember which the nozzle is set up at and then when they are in and open the line on the fire realizing to late that it is a fog it will only lead to problems with steam. At least with a smoothbore you have one less thing to be concerned with and just can prevent the spread of the fire. To vent and overhaul the combo tip is great but not for knock down. If you really want to see this all you need to do is try it. Test the knockdown with a combo and a smoothbore and you will never go back to a combo.

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      • #33
        When you are at your initial attack into a building you must go in with a smoothbore. It's knock down power is just incomparable with a combo.
        That is such a broad generalisation PRFD101 - There are different types of fire. If you can see 100 percent involvement with flames issuing from your entry point then yes, a smooth-bore nozzle may well be the optimum primary attack tool. However, if you can only see smoke rolling out and need to go 'find' the fire, then a 'combo' nozzle is by far the better option.

        When someone new is going in and they are carrying a combo tip they forget to check it or are just to hyped to remember which the nozzle is set up at and then when they are in and open the line on the fire realizing to late that it is a fog it will only lead to problems with steam.
        Then your training program needs seriously addressing! The 'new' guy should neither be working on his own but under supervision of an old hand who can check the 'hype'.

        To vent and overhaul the combo tip is great but not for knock down. If you really want to see this all you need to do is try it.
        Yes I agree - you really need to see and try this because it ain't so in ALL situations. In some the combo wins out, in others the smooth-bore wins out! You cannot suggest for one minute that a smooth-bore nozzle is the most efficient for dealing with a rollover situation in a corridor; or for cooling the super-heated gas layers existing in the overhead in an adjacent room!

        If you make such broad generalisations about any specific nozzle then we are back to 'plain-old' smooth .v. fog debate here!
        www.euro-firefighter.com

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        • #34
          You know, there are rarely any absolutes about anything.....and a couple of huge factors in what tactics and equipment Departments use is policy and budget.

          Leather helmets, polycarbs, composites.....

          Bunker pants, 3/4 boots......

          Nomex, PBI, Cotton duck(just for you Chief)......

          CO2, dry chem(Gonzo's contribution).....

          Synthetic hose, cotton jacketed.....

          Smoothbore, or combos........

          All these different tools are used everyday by firefighters across the world, and I am sure I missed a bunch of comparisons with stuff that is used in Europe. Somehow these jakes are putting out fires. With whatever equipment they are allowed to use, by policy of their Department.

          Are some methods more effective? Sure. Do other methods still get the job done? You bet.

          While the advantages have been argued at length, we should be keeping the conversation civil (which this one has been for the most part) and SHARING idea, methods, tactics and techniques. Why? So we can all be better at what we do. I'll guarantee you that this debate could be won by the smoothbore side and my Department would still use combo tips, and there isn't a thing I can do to change that...yet.

          So remember, it will go out. Sometimes because you put it out, other times because the fuel ran out.

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          • #35
            OK Here is somethimg of relevance - I have located an old research report that compared the 'force of impact' of firefighting streams -

            at 12' 6" a 160 gpm flow from a combination straight stream out-performed the same flow from a 3/4" (both at 100psi NP) 86psi to 78 psi IMPACT FORCE.

            at 25' the 3/4" was superior by 2psi.

            at 50' the combination straight stream by 3psi IMPACT FORCE.

            Similar tests were undertaken comparing a 7/8th nozzle against a combo straight stream - overall the combo stream achieved slightly greater IMPACT FORCE.

            I guess that's as close as you can get to a 'penetration' assessment - if such a thing exists!
            www.euro-firefighter.com

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            • #36
              Originally posted by Batt18
              OK Here is somethimg of relevance - I have located an old research report that compared the 'force of impact' of firefighting streams -

              at 12' 6" a 160 gpm flow from a combination straight stream out-performed the same flow from a 3/4" (both at 100psi NP) 86psi to 78 psi IMPACT FORCE.

              at 25' the 3/4" was superior by 2psi.

              at 50' the combination straight stream by 3psi IMPACT FORCE.

              Similar tests were undertaken comparing a 7/8th nozzle against a combo straight stream - overall the combo stream achieved slightly greater IMPACT FORCE.

              I guess that's as close as you can get to a 'penetration' assessment - if such a thing exists!
              Thanks for this info Paul. Now I have some ammo when people on my department say we can't use smoothbores because "they cause too much damage"
              FTM-PTB-DTRT

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