CMC NFPA 306 Standard Application 2

Question 1

Under NFPA 306, what action must be taken before any hot work is performed in a space that previously contained flammable cargo?

Accepted Answer

Obtain a Marine Chemist Certificate or Coast Guard permit

Answer

NFPA 306 requires a Marine Chemist Certificate or equivalent Coast Guard permit before hot work in spaces that have contained flammable materials.

Question 2

Which atmospheric condition would cause a Marine Chemist to label a space 'Not Safe for Workers' under NFPA 306?

Accepted Answer

Oxygen level below 19.5%

Answer

NFPA 306 defines oxygen-deficient atmospheres as below 19.5%, making the space Not Safe for Workers.

Question 3

How does NFPA 306 define a 'tank' for the purposes of its scope?

Accepted Answer

Any vessel compartment designed to carry liquid cargo or fuel

Answer

NFPA 306 broadly defines tanks as vessel compartments designed to carry liquid cargo or fuel, covering a wide range of ship spaces.

Question 4

When inspecting a space under NFPA 306, at what LEL reading is hot work generally considered permissible?

Accepted Answer

Below 10% LEL

Answer

NFPA 306 specifies that hot work areas must test below 10% LEL to be deemed Safe for Hot Work.

Question 5

According to NFPA 306, how frequently must re-inspection occur when continuous ventilation cannot be maintained in a hot-work space?

Accepted Answer

Before each resumption of hot work

Answer

NFPA 306 requires re-inspection before each resumption of hot work when continuous ventilation is interrupted.

(CMC) Certified Marine Chemist Practice Test