CMC - Certified Marine Chemist Confined Space Entry Requirements Questions and Answers

Question 1

According to OSHA 29 CFR 1915 Subpart B and NFPA 306, what is the correct order for atmospheric testing in a confined space prior to entry?

Accepted Answer

Oxygen content, flammability, then potential toxic contaminants.

Answer

Flammability, oxygen content, then potential toxic contaminants.

Answer

Potential toxic contaminants, oxygen content, then flammability.

Answer

Oxygen content, potential toxic contaminants, then flammability.

Question 2

A Marine Chemist is called to certify a fuel oil cargo tank for hot work. The tank has been cleaned and ventilated. What is the maximum permissible Lower Explosive Limit (LEL) reading for the chemist to issue a 'Safe for Hot Work' certificate?

Accepted Answer

Exactly 0%

Answer

Less than 10%

Answer

Less than 5%

Answer

Less than 1%

Question 3

A shipyard competent person has been monitoring a space certified as 'Safe for Workers' by a Marine Chemist. If a change in conditions occurs, such as the introduction of a cleaning solvent, which of the following actions is required?

Accepted Answer

Stop all work, re-evaluate the space, and potentially void the certificate.

Answer

Continue work as long as the original certificate is posted.

Answer

Ventilate the space for 30 minutes and then resume work.

Answer

Record the new solvent on the existing certificate and proceed.

Question 4

Under which of the following scenarios is a Marine Chemist's certificate MANDATORY before hot work can begin?

Accepted Answer

Welding on a bulkhead immediately adjacent to a tank that previously contained diesel fuel.

Answer

Welding on a new steel plate in a fabrication shop.

Answer

Grinding on a handrail on the open main deck.

Answer

Replacing a pipe in the engine room's bilge, which contains only water.

Question 5

A Marine Chemist's certificate for a confined space specifies 'Enter with Restrictions.' Which of the following best describes what this designation implies?

Accepted Answer

Entry is permitted only if specific controls like continuous ventilation or PPE are used.

Answer

The space is safe for entry but not for any type of work.

Answer

Entry is prohibited until the space is re-certified as 'Safe for Workers'.

Answer

Only a certified Marine Chemist is permitted to enter the space.

Question 6

Which of the following standards is the primary document a Certified Marine Chemist applies when evaluating gas hazards on vessels?

Accepted Answer

NFPA 306 - Standard for the Control of Gas Hazards on Vessels

Answer

OSHA 29 CFR 1910.146 - Permit-required confined spaces

Answer

NFPA 70 - National Electrical Code

Answer

IMO SOLAS - Safety of Life at Sea Convention