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  1. #1
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    Default When would you use a double male 2 1/2" coupling?

    We have this on all of our appartatus's, finally someone asked the great question, when would we use this? Anyone have any idea? Because we sure didnt.


    Best i could come up with was you stretched the 2 1/2 hose, and needed to put a nozzle on the starting end (at the pump panel) with an additional length, which then requires you to put a double female on the other end to hook up to a separate apparatus.

    Settle this dilema, and next time you're in your firehouse, see if you have this evil coupling.


  2. #2
    Forum Member DeputyMarshal's Avatar
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    You will probably find at least one set of double males and double females on more engines than not. (I don't know if they're still on the required list but they used to be required on engines for full ISO credit.)

    You guessed correctly, BTW. A set of double fe/male couplings are handy for "reversing" the direction of a preconnected line in a hurry. For instance, a hydrant line packed for a forward lay can quickly become a reverse lay by just adding a "gender changer" to each end. The uses are only as limited as your imagination.
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    Quote Originally Posted by DeputyMarshal View Post
    You will probably find at least one set of double males and double females on more engines than not. (I don't know if they're still on the required list but they used to be required on engines for full ISO credit.)

    You guessed correctly, BTW. A set of double fe/male couplings are handy for "reversing" the direction of a preconnected line in a hurry. For instance, a hydrant line packed for a forward lay can quickly become a reverse lay by just adding a "gender changer" to each end. The uses are only as limited as your imagination.
    Been there, done that, and it beats unloading and reloading the hose!
    ‎"The education of a firefighter and the continued education of a firefighter is what makes "real" firefighters. Continuous skill development is the core of progressive firefighting. We learn by doing and doing it again and again, both on the training ground and the fireground."
    Lt. Ray McCormack, FDNY

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    If you're rural firefighting it can save having two beds of 2 1/2" on the truck, one in forward lay and one in reverse. You want reverse lay if you're heading to a water source and leaving hose for the pumper, tanker or whatever as you're drafting and pumping as supply. You want forward for catching hydrants or laying hose on the way to a scene where you're going to be supplied.
    If you're tight on space, you just have one lay and use the couplings as required.
    Cheers,
    Gord

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    Wouldn't you use it when you needed to connect two females together?

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    Quote Originally Posted by johnny46 View Post
    Wouldn't you use it when you needed to connect two females together?
    Damn, Johnny, you have got an idea there. I've had difficulty in the past trying to get two females together. I'm gonna start carrying the adapter in my pocket all the time.

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    we use it for connecting a length of 2 1/2" hard suction from the 2 1/2" intake on the pumper which is female to a tanker which also has a female adapter since the valves are normally used for filling. Unless you have some sort of an oddball chunk of suction, it is impossible to do this without a double male.

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    Is that a holdover from the old days? We used 4" with stortz since fire was created, then upgraded to 5" with stortz. Maybe in a more urban setting its more usefull, but Ive never seen 2-1/2 being usefull for a supply line over any distance.

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    Quote Originally Posted by quint1officer View Post
    Is that a holdover from the old days? We used 4" with stortz since fire was created, then upgraded to 5" with stortz. Maybe in a more urban setting its more usefull, but Ive never seen 2-1/2 being usefull for a supply line over any distance.
    Before we had LDH on all our pumpers I can remember laying dual duece and halfs. We thought we were big **** doing that. Had 1400 ft of duece and a half in the bed. We now use 5 in., however, we still keep some duece and half for the rural lay. It is layed as a preconnect but with the mentioned double it doubles as a supply to the folding tank.
    IACOJ - Senior Jake

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    Ok, I guess Ive just never seen it used that way. Most of our supply drops are 800' + on average, just couldnt' see using that for 2-1/2".

    And I guess there's another identical thread working somewhere else on here?

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    The first LDH in the U.S. in 1950-something used 2.5" threaded fittings for 3" double jacket cotton hose donated by Hartford & New Haven FDs to be coupled to 3.5" Single jacket synthetic hose imported from England. The difference in jacket thickness due to the different materials was enough the fittings for conventional 3" fit the new 3.5".

    If you really want the trivia lesson beyond that...at the time U.S. hose manufacturers were protected by a high tariff. The 3.5" was shipped to the Ontario Provinicial Fire Marshal, and was picked up at his office and driven back to Connecticut in a farm truck -- rightfully figuring the Customs Officers wouldn't think to look up if fire hose had a tariff imposed on it or not.

    ===========
    Dual 3" = Single 4". But like 4", is ideal where you have moderate hydrant spacing and flows and moderate fire flow needs.
    Last edited by Dalmatian190; 02-28-2007 at 05:42 PM.

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    If you have older FDC conections that have 2 openings you will have to use at least 1 double male to hook up to it depending on how your 3'' hose is packed on the eng.

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    Quote Originally Posted by SSHANK42 View Post
    Before we had LDH on all our pumpers I can remember laying dual duece and halfs. We thought we were big **** doing that. Had 1400 ft of duece and a half in the bed.
    We used to run a 2 piece engine company. The first engine would stop at the fire building and the 2nd engine, with a split bed of 1200' (600' on a side) of 2 1/2", would lay either dual or a single line depending on the distance to the hydrant.

    You would need the double female to make the hydrant connection and a double male to make the connection at the pump for a dual lay.

    Fortunately, we have been using 4" for about 15 years.
    Last edited by KenNFD1219; 02-28-2007 at 09:44 PM.
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    Quote Originally Posted by GFDLT1 View Post
    If you have older FDC conections that have 2 openings you will have to use at least 1 double male to hook up to it depending on how your 3'' hose is packed on the eng.
    Why is that sir?

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    Dispatch Dweller Jay911's Avatar
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    It's also rather helpful when a M/A company hands your pump operator the female end of a 2 1/2" and then goes off doing a reverse lay to the hydrant with a forward-laid bed. Just let them find a double female for their end of the stretch.
    --jay.

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    Quote Originally Posted by Jay911 View Post
    It's also rather helpful when a M/A company hands your pump operator the female end of a 2 1/2" and then goes off doing a reverse lay to the hydrant with a forward-laid bed. Just let them find a double female for their end of the stretch.
    Precisely.
    As for all of the LDH users, we've been working on getting a purchase of an appreciable amount of LDH but have so far been unsuccessful. Have to work on the new town council. Only thing we have enough of for any distance is 2 1/2. Oh well, some day we'll jump into the 20th century (hopefully before the end of the 21st, already 7 years too late!)
    Cheers,
    Gord

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    Originally Posted by GFDLT1:
    If you have older FDC conections that have 2 openings you will have to use at least 1 double male to hook up to it depending on how your 3'' hose is packed on the eng.

    Quote Originally Posted by quint1officer View Post
    Why is that sir?
    I was wondering this too? I'm not against females in the F.S. but did we have to change "Males to the Fire" once we started getting all the women?

  18. #18
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    Quote Originally Posted by quint1officer View Post
    Why is that sir?
    The building siamese has 2 females coming out of the wall, this is what we connect into. If you have 3'' in your bed that is set up for forward lays then your female is the first coupling to come out of the bed. So if you going to hook up to the FDC and you grab that female to hook into another female (FDC) then you will need a double male to make that connection.

  19. #19
    Dispatch Dweller Jay911's Avatar
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    Quote Originally Posted by GFDLT1 View Post
    If you have 3'' in your bed that is set up for forward lays then your female is the first coupling to come out of the bed.
    Many of us would take the easier route of grabbing the two donut rolls stored in the compartment right beside the pump panel for this very purpose.

    Everyone does it differently, I'm sure!
    --jay.

  20. #20
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    Quote Originally Posted by Jay911 View Post
    Many of us would take the easier route of grabbing the two donut rolls stored in the compartment right beside the pump panel for this very purpose.

    Everyone does it differently, I'm sure!
    You could do that if your eng carries 2 extra donut rolls, but we don't and even if we did you would need more than 2. Sometimes our lay out from the building FDC to the hydrant is more than 200'. I can think quite a few in our first due where you will have atleast a 250' if not longer lay out to the hydrant. Now all of our new commerical for the past 5 years or so the hydrants through town ordinances or code have been installed so that you only have to mess with about 100' of hose or less. This being the case now your 2 donut rolls would work.

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