CNG Codes, Standards, and Compliance 2

Question 1

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

Accepted Answer

NFPA 52

Answer

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

Question 2

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

Accepted Answer

20 years

Answer

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

Question 3

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

Accepted Answer

OSHA

Answer

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

Question 4

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

Accepted Answer

Compressed natural gas vehicle fuel containers

Answer

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

Question 5

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

Accepted Answer

3,600 psi

Answer

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

(CNG) Compressed Natural Gas Practice Test