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Hazmat Missiles & the CDL Manual

Discussion in 'Questions From New Drivers' started by TheShadow, Sep 11, 2012.

  1. Sep 11, 2012 #1
    TheShadow

    TheShadow Light Load Member

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    Dear TR Forum:

    Page 9-14 of the Commercial Driver's Manual: Pertaining to the HAZMAT chapter: Class 2 Compressed Gases Including Cryogenic Liquids: "...Cylinders may be loaded in a horizontal position (lying down) if it is designed so the relief valve is in the vapor space."

    What the heck does that mean in English? Vapor space? If I'm not mistaken, anything compressed in a bulk quantity or amount, becomes a missile if the "relief valve" is struck hard enough regardless of where it may be.

    Please clarify the above.

    Thanks,

    Shadow.:biggrin_25521::biggrin_25521::biggrin_25521: wise-moves.jpg
     
    TheShadow, Sep 11, 2012
    TheShadow, Sep 11, 2012
    #1
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  3. Sep 11, 2012 #2
    MsJamie

    MsJamie Road Train Member

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    That means that if the cylinder gets too hot and has to release some of its contents, gas (vapor) will be released and not liquid.
     
    MsJamie, Sep 11, 2012
    MsJamie, Sep 11, 2012
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    TheShadow Thanks this.
  4. Sep 11, 2012 #3
    chalupa

    chalupa Road Train Member

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    And the difference between a compressed gas and a cryogenic liquid is 23 lbs psig. And yes, if you knock the valve off a cylinder of compressed gas it will become a rocket.

    I believe all transported cylinders must have a cap screwed on so this can't happen.

    You planning to haul cylinders?
     
    chalupa, Sep 11, 2012
    chalupa, Sep 11, 2012
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    TheShadow Thanks this.
  5. Sep 12, 2012 #4
    TheShadow

    TheShadow Light Load Member

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    Haul cylinders? Have to get my CDL Class A License first. My main concern is figuring out what was meant by vapor space in the CDL manual HAZMAT section so I can get my HAZMAT endorsement on my CDL Permit (that I already have). I would think most would avoid transporting cylinders of compressed gas HORIZONTALLY as VERTICALLY sounds safer. Is that true?
     
    TheShadow, Sep 12, 2012
    TheShadow, Sep 12, 2012
    #4
  7. Sep 12, 2012 #5
    chalupa

    chalupa Road Train Member

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    Absolutely, but you will see welders build racks that lay them down on their truck....and that's ok. But yes, fillers transport them upright and strapped and that is a better way to carry them.
     
    chalupa, Sep 12, 2012
    chalupa, Sep 12, 2012
    #5
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