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Cylinders
  • The HMR outlines specifics for cylinders used to transport hazardous materials.

A cylinder is a pressure vessel designed for pressure higher than 40 psia (pounds per square inch absolute) and has a circular cross section. It does not include a portable tank, multi-unit tank car tank, tank car, or cargo tank. The definition for cylinder can be found in 171.8.

The specifications for construction of cylinders can be found in Part 178, subpart C of the Hazardous Materials Regulations (HMR).

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.