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Thread: Supply Hose

  1. #1
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    Default Supply Hose

    Does anyone believe that there is a better chance of getting awarded for either 4" or 5" LDH over one or the other? Or is it better to just word it as LDH and not mention the size?


  2. #2
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    Most would think 5in better because same volume, lower friction loss. But you also have space considerations in hose beds, and if you don't have anywhere that the friction loss comes into play because you don't have a water source to support the higher flows then it's whichever size works for your department. Houston FD stuck with 4in because it goes right on the hydrant and they're all over the place so 5in didn't provide any tactical advantage. Might have changed since last I knew but haven't heard anything different, but either way they had a reason to stick to 4 instead of 5. If you do also then support it. Anything is better than 3in as a supply line.

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    We currently lay dual 3" lines with threaded couplings. All of our mutual aid departments use 4" and it works well for them. There are also obvious price and handling advantages to 4" as well. Sure, the reduced friction loss of 5" would be nice for long relay operations with fewer pumpers, but this would be a very rare case for us. We do have hydrants in town, but the best ones flow just over 1,000 gpm. Most of our area is non hydranted and we generally use tanker shuttles. Often we will lay a few hundred feet of supply line down long driveways and lanes to pump from the dump site to the attack engine. Another concern with 5" in these scenarios is the extra gallons of water from the initial tank to just fill the hose. Our typical response would be 1st engine goes down driveway and lays hose. Second engine hooks to the line and starts supplying off of tank water until a tanker arrives. On a 1000' lay with 4" it takes about 650 gallons to fill the hose, so with a 1,000 gal tank we would still get about 350 usable gallons of water to fight the fire. With 5" it would take a little more than the entire booster tank, about 1,020 gallons to just fill the line.

    I think in our situation, we would much rather go with 4", but if 5" is easier to get awarded for then we are open to the possibility of going that

  4. #4
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    LDH is LDH when you request is, and reviewers go with what you recommend for yourself. And like many others here have done when asking questions, you just wrote most of your narrative justifying 4in in that post.

  5. #5
    Forum Member islandfire03's Avatar
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    Since all of your mutual aid depts have 4" you should ask for 4 inch as that makes you compatible with them for interoperability.
    that will score points with peer reviewers.

    Same size fittings without need for adapters,.As you noted laying in a long length from water supply operations takes a lot of water just to fill hose.
    We & all our neighbors carry 1250 ft of 4" ldh on our engines along with a rural hitch setup that is dropped at end of road or drive before laying in to scene. When the takers and second in engine arrive they drop porta tanks and hook up supply. The rural hitch is a clapperd gated wye 4x4x4 and two 25 ft lengths of ldh to hook up to tankers or supply engines.

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    I was told size doesn't matter.

  7. #7
    Forum Member islandfire03's Avatar
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    She lied to you
    :-}

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