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Propane Storage Tank Area Classification

Although state and local guidelines for the storage, use and handling of propane and propane canisters may vary to some extent, the propane storage tank area certifications are developed by the National Fire Protection Association (NFPA). The codes are covered in detail in "NFPA 58 Liquefied Petroleum Gas Code." Typically propane is classified as Class I, Division 1 and 2, Group D, 450C AIT.

  1. Class and Division

    • A class I location indicates the presence or likelihood that gasses or vapors are present. Division 1 indicates areas where concentrations of gas can exist due to frequency of use or where failures of ventilation or other systems can cause a buildup of gasses. Division 2 indicates an area where gas may be present but it is usually confined to sealed tanks. This generally indicates areas where propane cylinders are stored.

    Group and AIT

    • The group indicates the specific type of material involved. Group D also includes acetone, butane, hexane, natural gas and fuel oil. An indication of 450 C is for the Auto-Ignition Temperature (AIT) of the hazardous materials. The AIT for various materials is covered under NFPA 497. The AIT for propane is 450 or 450 degrees Celsius.

    Training and Signs

    • Employers are required to properly train employees in the safe handling of dangerous, explosive, combustible or flammable materials. Additionally, when marking an area classified for dangerous materials, employers are required to post signs marking where the area begins. It is a good idea to make these signs as large as possible -- not only for the benefit of employees, but potentially for the benefit of firefighters. It is important that the signs can be seen and in the event of a fire or other emergency, it is helpful to emergency workers if the signs can be seen from a distance.

    Other Regulations

    • For specific regulations regarding signage and training, it is important to check with state and local agencies. International regulations may also vary significantly from propane and other gasses, including regulations for the transportation of propane. In addition, the U.S. Department of Transportation and the U.S. Occupational Health and Safety Administration also have significant regulations regarding propane and other flammable and combustible gasses.

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