CMC - Certified Marine Chemist Regulatory Compliance and Standards Questions and Answers

Question 1

A Marine Chemist issues a certificate for a vessel's cargo tank which includes specific requirements for continuous mechanical ventilation. Two days later, the shipyard experiences a power failure, disabling the required ventilation. According to NFPA 306, what is the immediate status of the Marine Chemist's certificate for that tank?

Accepted Answer

It is automatically rendered invalid.

Answer

NFPA 306, Section 8.4, 'Responsibility for Maintaining the Conditions,' makes it clear that if any of the prescribed conditions on the certificate change, the certificate becomes invalid. The failure of required ventilation is a significant change in conditions, thus immediately invalidating the certificate.

Question 2

A vessel's fuel oil purifier has been removed and taken to a land-side machine shop within the shipyard's boundaries for welding repairs. Which standard(s) contain the primary governing requirements that a Marine Chemist must follow to certify the part as safe for hot work?

Accepted Answer

NFPA 306, as it applies to vessels and land-side spaces within a shipyard or waterfront facility.

Answer

The scope of NFPA 306 explicitly applies to vessels during repair AND to land-side confined spaces located within the boundaries of a shipyard or waterfront facility. Since the purifier is a part from a vessel that contained a flammable liquid and the repair is happening within the shipyard, NFPA 306 is the primary standard for the Marine Chemist's evaluation.

Question 3

According to NFPA 306, what are the requirements for the calibration of test instruments used by a Marine Chemist?

Accepted Answer

The accuracy of the instruments shall be verified or calibrated in accordance with the manufacturer’s instructions.

Answer

NFPA 306, Section 6.1 'Calibration and Function Verification,' requires that instruments used by the Marine Chemist be verified or calibrated according to the manufacturer's instructions. While daily functional checks are a best practice, the standard explicitly defers to the manufacturer's recommended procedures for formal calibration.

Question 4

A vessel is being prepared for a long-term 'cold' lay-up. According to NFPA 312, which is referenced by NFPA 306 for this activity, what is the general requirement for the vessel's cargo tanks that previously held flammable liquids?

Accepted Answer

Tanks must be kept gas-free.

Answer

For vessel lay-up, safety guidelines generally require that all cargo tanks, pump rooms, and associated piping that contained flammable or combustible products be cleaned and maintained in a gas-free condition to eliminate the fire and explosion hazard during the unattended period.

Question 5

A Marine Chemist is certifying a refrigerated hold on a fishing vessel for entry. The refrigeration system utilizes ammonia (NH3). Which value represents the OSHA Permissible Exposure Limit (PEL) as an 8-hour time-weighted average (TWA) that the chemist must test for?

Accepted Answer

50 ppm

Answer

According to OSHA, the legal airborne permissible exposure limit (PEL) for ammonia is 50 ppm averaged over an 8-hour work shift (TWA). While other organizations like NIOSH and ACGIH recommend lower limits (e.g., 25 ppm TWA), the OSHA PEL is the mandatory federal limit in the United States.

(CMC) Certified Marine Chemist Practice Test

(CMC) Certified Marine Chemist Practice Test

CMC - Certified Marine Chemist Regulatory Compliance and Standards Questions and Answers