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Cylinders are pressurized containers used to transport hazardous materials. The fact that the gas inside is under pressure presents a hazard. Additionally, sometimes cylinders hold gases with other hazardous properties, for example, corrosive or flammable gases. Cylinders must meet certain specifications in order to be used to transport hazardous materials.
For safety purposes, cylinders must be designed, inspected, and maintained according to the hazardous materials regulations. Shippers must ensure they’re using cylinders appropriate for the material and that the cylinder is in good condition.
Section 173.301 covers the general requirements for the shipment of compressed gases and other hazardous materials in cylinders, UN pressure receptacles and spherical pressure vessels. This section includes the general specifications for cylinders, cylinder markings, pressure relief device systems, manifolding cylinders during transportation, and valve protection requirements.
The specifications for construction of cylinders can be found in Part 178, Subpart C of the Hazardous Materials Regulations.
Cylinders are required to undergo certain tests and inspections. For more information see Part 180, Subpart C.
Cylinders are required to be properly marked and labeled for transport. Placards may be required for transporting certain loads of cylinders. For information on these topics see the ez Explanations Marking, Labeling, and Placarding.