NFPA 306 Standard Application Flashcards
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Read the first 7 NFPA 306 Standard Application flashcards as text
Under NFPA 306, which factor primarily determines whether a space adjacent to a cargo tank requires its own Marine Chemist inspection?
Answer: Whether the adjacent space shares a common bulkhead, piping, or vapor path with the cargo tank
NFPA 306 requires inspection of adjacent spaces when they share a structural or piping connection that could allow vapor migration from the cargo tank.
What type of gas detection instrument does NFPA 306 implicitly require for measuring flammable vapors below the LEL?
Answer: Catalytic bead (pellistor) combustible gas detector
Catalytic bead combustible gas detectors are the standard instruments for measuring flammable vapor concentrations as a percentage of LEL, as referenced in NFPA 306 application.
A ballast tank on a tanker vessel has never carried cargo but is adjacent to a fuel oil double bottom. Under NFPA 306, how should this space be classified before hot work?
Answer: Requires inspection because proximity to fuel systems introduces potential vapor hazard
NFPA 306 requires inspection of any space where flammable vapors may be present due to proximity or connection to fuel or cargo systems, regardless of the space's own cargo history.
According to NFPA 306 principles, what is the primary purpose of continuous forced ventilation during hot work operations?
Answer: To dilute and remove flammable or toxic vapors to maintain safe atmospheric conditions
Continuous forced ventilation under NFPA 306 serves to continuously dilute and exhaust flammable and toxic vapors, maintaining conditions below hazardous thresholds during work.
Under NFPA 306, when is an inerted space (oxygen below 2%) considered 'Safe for Hot Work'?
Answer: Never; inerted spaces cannot be certified Safe for Hot Work
An inerted space with oxygen below 2% prevents combustion but is also immediately dangerous to life and cannot be certified Safe for Hot Work under NFPA 306.
A Marine Chemist inspecting under NFPA 306 detects 8% LEL in a tank's lower sump area but 0% LEL at mid-level. What is the correct certification decision?
Answer: Certify as 'Safe for Hot Work' since 8% LEL is below the 10% limit everywhere
Since 8% LEL is below the NFPA 306 threshold of 10% LEL at all tested locations, the space may be certified as Safe for Hot Work, though stratification should be noted.
Under NFPA 306, what is the Marine Chemist's obligation if, during hot work, conditions deteriorate and the space no longer meets certification requirements?
Answer: Immediately advise the person in charge to stop work and evacuate the space
When conditions deteriorate below certification standards, NFPA 306 requires the Marine Chemist to immediately direct the responsible party to halt work and evacuate.