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    Cylinder Safety

    Helping you put KnowHow to work.

    nexAir Liquid Cylinders

    Quick Reference Safety Guide

    This Quick Reference Guide provides basic safety information for handling, storage and operation of nexAir DOT-rated liquid cylinders for cryogenic and refrigerated gases such as liquid nitrogen, oxygen, argon, carbon dioxide, and nitrous oxide.

    Personal Protective Equipment (PPE)

    To reduce the risk of injury, wear proper protective apparel before operating, transporting or handling this or any liquid cylinder.

    GLOVES*

    Heavy-duty work gloves

    FOOTWEAR*

    Steel-toed shoes or boots

    SHIRT**

    Long-sleeves; avoid loose-fitting

    PANTS**

    Snug and sturdy; avoid loose-fitting

    FACE SHIELD**

    Approved face shield

    *Minimum PPE for handling and transport
    **Additional PPE for filling and transfilling

    Transporting & Storing Liquid Cylinders

    Failure to observe these guidelines may result in serious injury.

    DON’T…

    • Lay, stack, transport or store liquid cylinder on its side
    • Lift or roll liquid cylinder manually
    • Lift or roll cylinder by handling ring or sight gauge protector
    • Use chain tie downs (unlike typical gas cylinders) as these might damage finish and crush or dent cylinder wall

    DO…

    • Store only in open air or well-ventilated area
    • Lift, move or hoist only with appropriate liquid cart or lifting device
    • Store in a room with an oxygen sensor if possible
    • Use or vent liquid cylinder daily to prevent pressure buildup (approx. 30psi/day)

    If cylinder is dropped or falls, the following steps should be taken immediately:

    1. Carefully lift cylinder back to vertical position
    2. Slowly open vent valve to vent head pressure
    3. If pressure increases suddenly, open vent valve and get away from cylinder
    4. Contact nexAir to have cylinder evaluated as soon as possible

    Cylinder ID Numbers

    You can identify your liquid cylinder by the DOT-rated service pressure number.

    Low pressure — DOT-4L100
    Medium pressure — DOT-4L200
    High pressure — DOT-4L292
    Very high pressure — DOT-4L412

    Safety Relief Valve & Burst Disc Pressure Chart

    DESIGNATOR DESIGNATOR SAFETY RELIEF VALVE PRESSURE BURSTING DISC PRESSURE
    LP 4L-100 22 200
    MP 4L-200 230 400
    HP 4L-292 350 600
    VHP 4L-412 500 700

    SRV Formula: [Service Pressure x 1.25] – 15 psig = SRV Pressure
    Example: [292×1.25]=356 psig -15 psig = 350 psig

    BD Formula: [Service Pressure x 110%] + Service Pressure = BD Limit
    Example: [292×110%] = 321.2 + 292 = 613.2 BD must not exceed (use 600 psig)

    Watch our full video

    How to Store, Handle, and Operate DOT-Rated Liquid Cylinder Safely