Liquefied petroleum gas, or LPG, has many industrial, home and recreational applications. The ubiquitous propane tank, or cylinder, can be found connected to backyard grills, cook stoves, recreational vehicles and many types of industrial equipment.
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The cylinders are subject to regulations aimed at ensuring safe use of this otherwise dangerous fuel.
Cylinders are made according to specifications of the Department of Transportation and are certified by the manufacturer as meeting these requirements.
Newly manufactured cylinders are stamped with the specification reference number and the date of manufacture. They also should have a decal identifying the contents as a flammable gas.
Cylinders must be recertified 12 years from the date of manufacture, and every five years after that. Most propane distributors have personnel qualified to do the recertification, which takes only a few minutes. Cylinders with expired certification may not legally be filled.
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