Codes, Standards, and Compliance Flashcards

Which NFPA standard specifically governs vehicular fuel systems using compressed natural gas?

Answer: NFPA 52

NFPA 52 is the Vehicular Gaseous Fuel Systems Code covering CNG and LNG vehicle fuel systems.

Under DOT regulations, CNG cylinders used on vehicles must be re-qualified or condemned after what maximum period from manufacture?

Answer: 20 years

Most CNG vehicle cylinders have a 20-year service life from manufacture date per DOT and cylinder manufacturer specifications.

Which federal agency requires CNG fueling stations to comply with process safety management (PSM) rules if they exceed threshold quantities?

Answer: OSHA

OSHA's PSM standard (29 CFR 1910.119) applies to facilities handling flammable gases above threshold quantities.

CSA NGV 1 is a standard that applies to which CNG component?

Answer: Compressed natural gas vehicle fuel containers

CSA NGV 1 establishes requirements for compressed natural gas vehicle fuel containers (cylinders).

What pressure does NFPA 52 define as the maximum allowable working pressure (MAWP) for a standard CNG vehicle fuel system?

Answer: 3,600 psi

NFPA 52 defines 3,600 psi (24.8 MPa) as the standard service pressure for CNG vehicle fuel systems.

Which organization publishes the NGV 2 standard for basic requirements of compressed natural gas vehicle fuel containers?

Answer: CSA Group

CSA Group (formerly Canadian Standards Association) publishes NGV 2, which is widely adopted for CNG cylinder requirements in the US.

When must a CNG vehicle fueling station operator obtain a variance from NFPA 52?

Answer: When proposing an alternative material or method not explicitly covered by the code

A variance or alternative method approval is required when an operator wants to use materials, equipment, or methods not addressed or differing from NFPA 52 provisions.