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Auxiliary intake

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  • Auxiliary intake

    Yesterday when refilling the engine using a 3? pony to the aux intake, the question of when to open the intake arose. Basically, we were discussing whether the intake
    ?should be opened before opening hydrant?
    ?should be opened after opening the hydrant..
    ?if the air in the hose can be bled out, or if it even matters at all, since there?s not an easily controlled bleeder like on the 5? keystone.
    Any opinion or evidence would be greatly appreciated, if nothing else just to see how others operate. For the record, we opened the aux intake then the hydrant.

  • #2
    I am guessing you have already flushed the hydrant -the only real difference I see is when you open the hydrant with the intake still closed you will have a glug of air compressed - no biggie if you don't slam the intake valve open -crack it and burp it as you are opening it
    ?

    Comment


    • #3
      My take is that for just filling the tank, it's not really going to matter much. But you should have a drain valve for that inlet that you can use as a bleeder for air. If you're flowing water, since that water is coming in under pressure, it should pass through the pump okay. Generally I don't think many people using the Aux. intake are using a really long lay of 3", so you shouldn't be getting that much air.

      Comment


      • #4
        On all the engines and tenders I have seen, the pony suction or AUX suction is no bigger than a 3" pipe. It also is usually threaded to receive a male end of a hose (backwards to how hose is rolled) It is too small, will take longer, and you gotta reverse the hose. It is much easier to use one of the other bigger 4" or 5" suctions.
        Jason Knecht
        Firefighter/EMT
        Township Fire Dept., Inc.
        Eau Claire, WI

        IACOJ - Director of Cheese and Whine
        http://www.cheddarvision.tv/
        EAT CHEESE OR DIE!!

        Comment


        • #5
          Originally posted by johnsb View Post
          My take is that for just filling the tank, it's not really going to matter much. But you should have a drain valve for that inlet that you can use as a bleeder for air. If you're flowing water, since that water is coming in under pressure, it should pass through the pump okay. Generally I don't think many people using the Aux. intake are using a really long lay of 3", so you shouldn't be getting that much air.
          Same conclusion we came up with. Post incident tank fill, no rush. We just wanted to see if anyone had any additional insight.

          Comment


          • #6
            MikeJ316,

            Our tankers are equipped with 3" hose with 3" Storz couplings. All of our apparatus have a 3" Storz adapter on the driver side auxiliary intake. On scene the tanker can roll out the 3" hose, a couple are preconnected, and quickly establish a water supply to supply the engine. It also works really good to refill grass rigs through a direct fill, just FYI. All our other apparatus have the Storz adapter on the auxiliary intake because we have a Storz adapter on the station fill hoses. Our tankers that don't have LDH tank fills have dual tank fills that have 3" Storz adapters as well to decrease the time it takes to make and break a connection. Just wanted to let you know how we operate for background.

            As johnsb stated, for refilling a tank it doesn't really matter since any air you have will pass through the pump, enter the tank and exit through the top fill or vent. Using the auxiliary drain valve to bleed air is also a good idea if the supplied apparatus is pumping. Slackjawedyokel was correct also if the apparatus is pumping, a little bit of air won't hurt the pump until it's all bled out, then open it all the way.

            With that said, when I'm refilling a tank regardless of fill hose size I usually close the intake valve first and then shut down the supply because either it's a hydrant that takes a minute to shut down or I have to walk to the station fill valve and shut it. After the supply is shut down I open the intake valve to get rid of the pressure in the line and then shut it again. We have some hydrants that give us around 80 psi. By shutting the supply then opening and closing the intake that pressure is reduced to just the head pressure in the plumbing. If there is a drain valve I open that instead. In the summer months it's not such a big deal because the water could feel good but in the winter the less water that sprays you the better.

            Hopefully this helped,
            Walt
            Train like you want to fight.
            www.kvfd.net

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