Practice Test Geeks(CMC) Certified Marine Chemist Practice Test
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Regulatory Compliance and Standards Flashcards

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  1. Under OSHA 29 CFR 1915.12, what is the minimum acceptable oxygen concentration for a worker to enter a confined space without supplied-air respiratory protection?

    Answer: 19.5%

    OSHA 29 CFR 1915.12 defines an oxygen-deficient atmosphere as one with less than 19.5% oxygen by volume, below which supplied-air or SCBA is required.

  2. NFPA 306 classifies a vessel space as 'Gas Free' for hot work when flammable vapor concentration is at or below what percentage of the Lower Explosive Limit (LEL)?

    Answer: 10%

    NFPA 306 requires flammable vapor to be at or below 10% LEL before a space is certified 'Gas Free' for hot work operations.

  3. Which federal regulation specifically governs hot work operations aboard vessels in shipyards and requires a Marine Chemist certificate for certain operations?

    Answer: 46 CFR Part 35

    46 CFR Part 35 (Hot Work) governs hot work on vessels and specifies when a Marine Chemist or Coast Guard authorized person must certify the space.

  4. Under 29 CFR 1915.7, who is authorized to certify a vessel space as safe for hot work when a Marine Chemist is not available?

    Answer: A Coast Guard Marine Inspector or a shipyard competent person

    29 CFR 1915.7 allows a U.S. Coast Guard Marine Inspector or, in their absence, a shipyard competent person to certify spaces when a Marine Chemist is unavailable.

  5. When testing a confined space atmosphere before entry, OSHA 29 CFR 1915.12 requires testing to be performed in what sequence?

    Answer: Oxygen, then flammable, then toxic

    OSHA requires oxygen concentration to be tested first, then flammable gases/vapors, then toxic substances, because sensor accuracy is affected by oxygen levels.

  6. Under NFPA 306, how frequently must a Marine Chemist re-test and re-certify a vessel space during continuous hot work operations if conditions remain unchanged?

    Answer: Only if conditions change or work is interrupted more than 30 minutes

    NFPA 306 requires re-certification if conditions change or if work is interrupted for more than 30 minutes, not on a fixed time interval under stable conditions.

  7. An oxygen concentration of 23.6% in a vessel compartment creates what type of hazard classification under OSHA 29 CFR 1915?

    Answer: Oxygen-enriched atmosphere

    Any oxygen concentration above 23.5% is classified as an oxygen-enriched atmosphere, which dramatically increases fire and explosion risk.