Where do the vapors go?

Discussion in 'Tanker, Bulk and Dump Trucking Forum' started by Switcher, Jul 14, 2021.

  1. wis bang

    wis bang Road Train Member

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    The vapor valve opening is the same size as the outlet plumbing so opening that line should prevent any vacuum. Vacuum is not good. Aluminum work hardens as it ages. I remember the owner of a small petroleum hauler being upset over a small mark in the side of the barrel after a guy got up against a phone pole on a tight place. He said the flexing at that spot from loading and unloading will eventually crack; any partial vacuum will accelerate that.
     
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  3. mpd240

    mpd240 Road Train Member

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    When I gravity drop into an underground tank my vapor return hose is 3 inches. My drop hose is 4.
     
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  4. HiramKingWilliams

    HiramKingWilliams Medium Load Member

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    Yes, for diesel.
     
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  5. wis bang

    wis bang Road Train Member

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    The liquid fuel pushes the vapors out, the old vent lines were usually 2" and would whistle for a warning as the tank filled due to the pressure.
     
  6. Lazer

    Lazer Medium Load Member

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    You don’t need as big a vapor hose, as the product hose. Liquids are 800+/- times more denser than air, thus the same volume of vapor will move easy thru a smaller hose.
     
  7. chemster

    chemster Medium Load Member

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    The guidelines we use state that you use 1in diameter hose for vapor for each 2 inches diameter for liquid. So you can vent two 4” product hoses with one 3” vapor line.
     
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  8. mustang190

    mustang190 Road Train Member

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    And for jet fuel and AvGas. I have never used a vapor recovery hose to unload.
     
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