CMC Chemical Hazard & Risk Management 3

Question 1

Under NFPA 306, which condition requires a Marine Chemist certificate before hot work can begin on a vessel?

Accepted Answer

Vessels in repair yards, shipyards, or where hot work could create fire or explosion hazard in spaces containing flammable vapors

Answer

NFPA 306 requires a Marine Chemist certificate for hot work on vessels where fire or explosion hazards exist due to flammable vapors, particularly in shipyard and repair environments.

Question 2

When assessing risk from a spilled corrosive liquid in a bilge space, which hazard interaction is of greatest concern to a Marine Chemist?

Accepted Answer

The corrosive reacting with structural steel to generate hydrogen gas

Answer

Strong acids reacting with iron or steel liberate hydrogen gas, which can accumulate to explosive concentrations in confined bilge spaces.

Question 3

A Marine Chemist is evaluating inhalation risk from a chemical with a vapor pressure of 200 mmHg at 25°C and a TLV-TWA of 0.1 ppm. What does the high vapor pressure indicate?

Accepted Answer

The chemical can generate airborne concentrations far exceeding its TLV, indicating high inhalation risk

Answer

A high vapor pressure means the substance readily forms vapors that can reach concentrations many orders of magnitude above a very low TLV, making inhalation a primary concern.

Question 4

Which OSHA standard specifically governs permit-required confined space entry on general industry vessels and shipyard employment?

Accepted Answer

29 CFR 1910.146 and 29 CFR 1915.12

Answer

29 CFR 1910.146 covers permit-required confined spaces in general industry, while 29 CFR 1915.12 specifically addresses confined and enclosed spaces in shipyard employment.

Question 5

The concept of 'hierarchy of controls' when managing chemical hazards aboard a vessel places which control method at the highest priority?

Accepted Answer

Elimination or substitution of the hazardous chemical

Answer

The hierarchy of controls prioritizes elimination first, followed by substitution, then engineering controls, administrative controls, and finally PPE as the last resort.

(CMC) Certified Marine Chemist Practice Test

(CMC) Certified Marine Chemist Practice Test

CMC Chemical Hazard & Risk Management 3