Which organization regulates the inspection and testing of cylinders?

The Department of Transportation (DOT) is the organization responsible for regulating the inspection and testing of cylinders used in the transportation of compressed gases, including Compressed Natural Gas (CNG). Under the Hazardous Materials Regulations (HMR) established by the DOT, specific guidelines and standards are set for the manufacture, labeling, filling, and maintenance of cylinders. These regulations ensure that cylinders are constructed and maintained to safely hold pressurized gas, therefore ensuring safety in transportation and use.

DOT's involvement is critical, as they establish performance standards that address factors such as material integrity, design, and pressure testing procedures. This regulatory oversight is essential for protecting public safety and preventing accidents associated with the storage and transport of hazardous materials.

In contrast, the other organizations mentioned have different focuses: the Environmental Protection Agency (EPA) primarily addresses environmental protection issues; the Occupational Safety and Health Administration (OSHA) focuses on workplace safety and health rather than specific regulations of cylinder testing; and the National Fire Protection Association (NFPA) provides guidelines and standards for fire safety but does not have direct authority over cylinder inspections and testing.