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Thread: interior attack

  1. #21
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    Quote Originally Posted by YFDLt08 View Post
    Holding one finger (out of 5 on that hand) over the spray effectively gives you the 1/5 ratio
    Ok, gotcha.

    Not sure what a firefighter with a hook for a hand's ratio would be though. LOL
    Maybe he could attach a prosthetic finger to the nozzle in some fashion?


  2. #22
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    Granted, with modern combination nozzles, two 1 3/4" lines can give you more gpm than a single 2 1/2", but there may be times when a second line may not be pulled initially, due to other fireground tasks being accomplished by the manpower on scene. In cases like that, I wouldn't rule out using a 2 1/2" as an attack line. But I would in no way look at using 2 1/2" as an across-the-board replacement for 1 3/4." As with everything in the fire service, the answer to the question is "it depends..."

    To add to this debate, Whitefishfire, what sort of nozzles does your department use? With a 3 man engine crew, it might be worthwhile to look into placing a smoothbore on one of your attack lines, for greater reach and gpm.

  3. #23
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    I don't see what's wrong with using a 2 1/2 on a residential fire. With todays material the BTU's are huge compared to what they were. For the guys giving out grief on this do you run your 1 3/4 at the proper pressure of do you run it low? On our 100 psi combination nozzles we need 150 psi to get 150 GPM out of it and the line is not managable because of nozzle reaction, now we have some mid pressure nozzles 75 psi= 200 GPM that we pump at the same pressure and it's managable and gives a good knock, but sometimes that's not even enough. So using a 2 1/2 with an 1 1/4 tip we are putting out over 300GPM and yes once the line is in place it's there but we use good line management and communication when doing this, and have never had a problem. BTW we train on this on a regular basis and we only ride 3 per rig.

  4. #24
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    Do you use water with those 2 1/2 lines or do you just throw in enough to smother the fire?
    Psychiatrists state 1 in 4 people has a mental illness.
    Look at three of your friends, if they are ok, your it.

  5. #25
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    Quote Originally Posted by TRUCK61 View Post
    I don't see what's wrong with using a 2 1/2 on a residential fire. With todays material the BTU's are huge compared to what they were. For the guys giving out grief on this do you run your 1 3/4 at the proper pressure of do you run it low? On our 100 psi combination nozzles we need 150 psi to get 150 GPM out of it and the line is not managable because of nozzle reaction, now we have some mid pressure nozzles 75 psi= 200 GPM that we pump at the same pressure and it's managable and gives a good knock, but sometimes that's not even enough. So using a 2 1/2 with an 1 1/4 tip we are putting out over 300GPM and yes once the line is in place it's there but we use good line management and communication when doing this, and have never had a problem. BTW we train on this on a regular basis and we only ride 3 per rig.
    I don't think the issue was about using the 2-1/2 on a residential fire being a bad idea, but rather selecting it as a first choice over the smaller lines as a routine course of action. For most SFD type fires, the smaller lines work just fine, but there may be instances in which something bigger could be more appropriate.

    We're definately not underpumping our 1-3/4 lines. We're using SabreJet nozzles with a 15/16" tip. With a 50psi nozzle pressure we "should" be flowing 185gpm according to the charts. In reality, the lines often get pumped higher than this - some of the guys forget we're not using 100psi automatics anymore.

  6. #26
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    Don't use 1 3/4 or 2 1/2...be radical, think outside the box, use 2 inch.

    In my humble opinion it is the perfect answer for higher flows with minimum staffing. My volly FD uses 2 inch exclusively for handline work and we generally move it with 2 people on the line. We use the Elkhart B-275GAT pistol grip shut off with a 1 1/4 inch slug tip, and the Elkhart 4000 series combo low pressure tip, 200 gpm at 75 psi. We underpump it initially to flow 160 gpm at about 55 psi at the nozzle and can go to 200 at 75 or go to the slug for 300 plus at around 40 psi at the tip.

    If your choices are 1 3/4 and 2 1/2 inch,the size of the fire, OR fire potential, determines the proper hoseline and fire flow. I would think your officers, or senior firefighters should be experienced enough to make the right choice. Or an SOG could be developed defining when to pull the larger line, merchantile, industrial, multiple residential properties, etc.
    Last edited by FyredUp; 07-27-2009 at 04:21 PM.

  7. #27
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    Stop mucking around and be safe.

    1 inch smooth bore tip on 5 inch LDH will get that matress fire out in a hurry.
    Psychiatrists state 1 in 4 people has a mental illness.
    Look at three of your friends, if they are ok, your it.

  8. #28
    Forum Member Bones42's Avatar
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    Quote Originally Posted by whitefishfire View Post
    Is there any deprtment using a 2 1/2 for a interior attack line?
    Simply put....Yes, when the situation calls for it.
    "This thread is being closed as it is off-topic and not related to the fire industry." - Isn't that what the Off Duty forum was for?

  9. #29
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    Quote Originally Posted by firefuss View Post
    You've been on the job for 20 years or so, and yet you started another topic asking what defined a battalion... ?
    Actually not that surprising. Many depts don't use the military designations. Some use companies, stations, districts. As long as everyone knows the terminology, it doesn't matter.

  10. #30

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    Our main attack line is 1 3/4....a 2 1/2 could be put into operation if the situation calls for it. A high rise situation might call for a 2 1/2, but maybe not a residential dwelling. I remember when I was in the academy and we spent numerous days lugging a charged 2 1/2 up 3 or 4 flights of stairs with two guys, opening up the nozzle, move across the room with the open line, and go to the floor above and do it again. It wasn't fun by any means. And any small department will tire there guys out instantly. It gives another meaning of how to move hose with webbing and "rolling" it to get up flights of stairs.

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