Codes, Standards, and Compliance Flashcards
7 cards from real CNG practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Codes, Standards, and Compliance flashcards as text
Which standard does NFPA 52 reference for the qualification of CNG fueling station technicians performing maintenance on dispensing equipment?
Answer: CSA NGV 4.1 and 4.2
CSA NGV 4.1 and 4.2 cover the installation and maintenance of CNG fueling station equipment, including technician qualification requirements.
A CNG station operator wants to use a new type of flexible connector not listed in NFPA 52. Under the code, this material may be acceptable if:
Answer: It is listed and labeled by a nationally recognized testing laboratory (NRTL)
NFPA 52 requires that unlisted materials or equipment be listed and labeled by an NRTL to demonstrate compliance with relevant standards.
Under 49 CFR Part 173, CNG cylinders transported on a vehicle for resale or transfer must bear which DOT marking?
Answer: The DOT specification marking (e.g., DOT-CFFC or DOT 3T)
CNG cylinders must be marked with their DOT specification (e.g., DOT-CFFC, 3T, or 3AA) certifying they meet federal construction standards.
NFPA 52 requires pressure relief devices (PRDs) on CNG vehicle cylinders to be directed away from which areas?
Answer: Engine compartment, passenger compartment, and fuel lines
PRD venting must be directed away from the engine compartment, passenger areas, and fuel lines to prevent ignition of vented gas in a fire situation.
Which organization's standards are most commonly cited alongside NFPA 52 for the design of CNG compression piping systems?
Answer: ASME B31.3 (Process Piping)
ASME B31.3 Process Piping is commonly applied to high-pressure CNG compression and station piping systems due to its rigorous requirements for cyclic service.
Under NFPA 52, what is the minimum required pressure rating for CNG station piping and fittings operating in the high-pressure circuit?
Answer: 1.25 times the MAWP
NFPA 52 requires station piping and components to be rated at a minimum of 1.25 times the maximum allowable working pressure of the system.
A CNG fueling station undergoes a change of ownership. Under NFPA 52 and local regulations, what must typically occur before the new owner resumes operations?
Answer: The AHJ must be notified and may require a compliance inspection before restarting
A change of ownership at a CNG station typically requires notifying the AHJ, which may conduct a compliance inspection to verify the facility meets current code before operations resume.