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    Default Hydrostatic testing of cascade/refill cylinders

    Does anyone know how often the bottles of a cascade/refill system have to have hydrostatic testing? A reference to a standard or regulation would be greatly appreciated.

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    I'm not absolutely positive on this, but I believe they follow GCA so would need to be tested every 5 years. Once again I am not positive on this.

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    I believe it's if you have DOT bottles it's every 5 years, and if you have the ASME bottles they do not have to be tested.

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    Steel cylinders容very 5 years (indefinite life until it fails a hydro test)
    All aluminum (not including hoop wrapped)容very 5 years (indefinite life until it fails a hydro test)
    Hoop-wrapped容very 3 years (15 year life)
    Fully wrapped fiberglass容very 3 years (15 year life)
    Fully wrapped Kevlar容very 3 years (15 year life)
    Fully wrapped carbon fiber容very 5 years (15 year life)

    as required by the DOT.
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    Well, depending on the tank type and installation. It's likely either 5 or 10 years. To be sure, get the identification markings on the tanks and call your local hydro shop. Its in in the DOT/CGA guidelines for each type of tank and they can quote the regs for you. ASME specs tanks are still subject to the DOT/CGA rules.

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    Quote Originally Posted by fire0099881 View Post
    I believe it's if you have DOT bottles it's every 5 years, and if you have the ASME bottles they do not have to be tested.
    This is the correct answer.

    DOT bottles typically weigh in under 200 pounds empty (150ish for 4,500 psi, 200ish for 6,000) and DOT's are flat on one side.

    ASME storage vessels are tapered on both ends, and usually weigh 400+ lbs.
    Last edited by txgp17; 04-05-2009 at 11:45 PM.
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    We have ASME vessels in our station cascade systems and they do not need to be hydro tested.

    Our mobile cascades have DOT vessels and I believe they are tested every 5 years.
    I can't believe they actually pay me to do this!!!

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    Quote Originally Posted by TheFNG View Post
    That's the kind of thing I'm looking for, something in black-and-white. Thanks. And thanks to everyone else, as well.

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