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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

  1. A CNG fueling station in California must comply with NFPA 52 AND which additional state-level enforcement body's requirements?

    Answer: California State Fire Marshal and local AHJ

    In California, CNG stations must meet NFPA 52 as enforced by the California State Fire Marshal and the local Authority Having Jurisdiction (AHJ).

  2. What does the term 'AHJ' mean in the context of CNG station compliance?

    Answer: Authority Having Jurisdiction

    AHJ stands for Authority Having Jurisdiction — the organization, office, or individual responsible for enforcing code requirements.

  3. Under NFPA 52, which marking is required on every CNG fueling hose assembly?

    Answer: Maximum allowable working pressure and date of manufacture

    NFPA 52 requires CNG fueling hose assemblies to be marked with the maximum allowable working pressure and date of manufacture.

  4. Which DOT specification cylinder type is most commonly used for CNG vehicle storage because it offers the best weight-to-strength ratio?

    Answer: Type 4 (non-metallic liner with full-wrapped composite)

    Type 4 cylinders use a non-metallic (polymer) liner fully wrapped in carbon fiber composite, giving the best strength-to-weight ratio for vehicle use.

  5. NFPA 52 requires that electrical equipment installed in classified hazardous locations at CNG stations comply with which standard?

    Answer: NFPA 70 (National Electrical Code) Article 500 or 505

    Electrical equipment in hazardous (classified) locations at CNG stations must meet NEC (NFPA 70) Article 500 or 505 requirements.

  6. According to NFPA 52, a gas detection system at an enclosed CNG fueling facility must activate an alarm at what percentage of the lower flammable limit (LFL)?

    Answer: 20% LFL

    NFPA 52 requires gas detection alarms to activate at 20% of the LFL to provide early warning well before a flammable concentration is reached.

  7. When a CNG vehicle cylinder exceeds its rated service life and cannot be re-qualified, what does compliance require?

    Answer: Remove the cylinder from service and render it permanently unusable

    Expired CNG vehicle cylinders must be condemned and permanently taken out of service — typically by cutting or mutilating the cylinder — to prevent unauthorized reuse.