Replacing 2 trailer air tanks with 1 tank?

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by mile marker 27, Mar 20, 2023.

  1. mile marker 27

    mile marker 27 Road Train Member

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    I’ve removed the tanks from this trailer that are 8” in diameter and slightly narrower than the frame rails. Was wondering if I replaced them with one tank that was comparable to both in capacity, would that be sufficient? I’m gonna just run one valve(FF2) for the spring brakes.
     
  2. JB7

    JB7 Medium Load Member

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    upload_2023-3-20_9-7-34.png

    Even if you got one tank to work, think about the liability if there was an accident.
     
  3. Judge

    Judge Road Train Member

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    My trailer came from factory with one big air tank.

    EA24C01A-6834-4D12-88D7-3151CCDDA0FC.jpeg
     
  4. ducnut

    ducnut Road Train Member

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    The 3 Wabash vans I pull are all single tank, as well.
     
  5. JB7

    JB7 Medium Load Member

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    upload_2023-3-20_9-46-7.png

    So one 12" tank has the same volume as two 8" tanks. So it looks like it could be done with a lot of hose and fitting work. Then there is the mounting of the tank which likely won't just bolt in place. Again, why?
     
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  6. mile marker 27

    mile marker 27 Road Train Member

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    Cause, I got room for a bigger tank and I’m going to only one valve. The old tanks need replaced. One tank, one valve. K.I.S.S. .
     
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  7. Last Call

    Last Call Road Train Member

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    sometimes there's a reason why some things aren't so simple
     
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  8. mile marker 27

    mile marker 27 Road Train Member

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    “Sometimes”, yes but other times not so. To think, or say so, would be painting with a broad brush. I’ve been looking at my own trailers(they all have multiple tank and valves) and looking at several others. Some reefer, low boy, end dump, dry van,……. and I found quite a few that surprising to me, have only one tank. Now, I’m not to saavy on the one tank and FF2 valve just yet but I’m willing to learn and try it. One thing I’ve learned is, just cause it ain’t been done, don’t mean it ain’t doable. It could also mean it’s not possible. That’s the reason my original post, is a question. Looking for some knowledge.
     
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  9. God prefers Diesels

    God prefers Diesels Road Train Member

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  10. W923

    W923 Road Train Member

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    Lots of trailers running around with a single tank and some old trailers with spring ride aren’t really that big.
    A large tank volume will provide better pressure for city driving with lots of stops in a short time. Idk where the cutoff would be to maintain adequate pressure for lots of quick stops.
     
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