1. #1
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    Default Class B Foam in a CAFS system

    Is anybody using this with regards to Class B Hydrocarbons or ARFF? Thanks in Advance..

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    we use CAFS but not with class b foam a department I know of did try it and would not do it again (messed up the ball valves) I assume you already know of flushing the lines it did not work to well for them from what I understand....... why thou if you dont mind me asking would you want to flow class b thru a CAFS system we use a built in eductor on our one truck....... I love the blanket it produces. hope this helps

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    Default Class B Foam

    If you wish to use Class B foam in your CAFS system, it would be wise to contact the manufacturer first. They could tell you if the CAFS system is capable of using it.

    If the manufacturer of your particular system approves its use, ask them to recommend what brands of Class B foam that you can use.

    Using Class B foam in a CAFS system that is not capable of using it, may cause problems and may void the warranty.

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    I've been meaning to ask this.

    Reading through various manuf's literature, I've seen that some say their systems can be used for class B foam as well as class A. I was wondering about that- say the actual concentrate proportioner is fully capable of working with class B concentrate, would high energy CAFS work as well or better than a typical aspirating nozzle or clamp on tube?

    It would seem that the high velocity CAFS stream would blow the hell out of a pool of flammable liquid- spraying it in all directions and just spreading the problem around. Simply opening up the stream on a combi knob from the strait stream would probably mitigate this somewhat, right?

    On a related note, would CAFS be an acceptable substitute for an aspirating nozzle when using flouroprotein foam? All anyone talks about is AFFF these days...

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    Many CAF systems use a very low flow foam pump that will not move the volume or density of AR-AFFF's, and proportioning the foam concentrate at 3 or 6% would result in unusable fire (foam) flows.

    If you spec'd your rig with a single tank for A foam then chances are (unless you specified otherwise) you got a class A capable foam proportioning pump/system that will not be useful with AR-AFFF.

    Look up the model of foam system you have and see what its flow/percentage rates are as well as getting a hold of the list of compatible concentrates and you will have your answers.

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    Quote Originally Posted by Nozzle nut 22 View Post
    I've been meaning to ask this.

    Reading through various manuf's literature, I've seen that some say their systems can be used for class B foam as well as class A. I was wondering about that- say the actual concentrate proportioner is fully capable of working with class B concentrate, would high energy CAFS work as well or better than a typical aspirating nozzle or clamp on tube?

    It would seem that the high velocity CAFS stream would blow the hell out of a pool of flammable liquid- spraying it in all directions and just spreading the problem around. Simply opening up the stream on a combi knob from the strait stream would probably mitigate this somewhat, right?

    On a related note, would CAFS be an acceptable substitute for an aspirating nozzle when using flouroprotein foam? All anyone talks about is AFFF these days...
    yes you can use it IF it says you can but as I said a department not far from mine did it and it ate the ball valves and such if my memory serves me well. 1 if you dont flush it just right then you will simply end up mixing class a and class b this is a huge problem.

    class b foams whether its AFFF or FFFP it puts a flim between the fuel and o2 (surpresses the vapors) if its a AR-AFFF or AR-FFFP it puts a alcohol resistant flim below the normal vapor surppressing flim.

    any system will push and splash the fuel around this is where the roll on,bank down or rain down methods come in

    now if you want to use blood foam we use a inline eductor with a smooth bore or a plain shutoff valve CAFS blows air into the foam and water so when it leaves the nozzle its finshed foam no need for a air aspirating nozzles so yes it works in its place if the system is not set up for say class b foam then you can do the eductor with air aspirating nozzle or smooth bore/shutoff valve

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