Question 64Safety & Environmental - 1st Asst/Chief

70% to pass

A fuel tank is considered to be gas free when the tank is _______________.

Ainerted with carbon dioxide for 24 hours
Bfree of all dangerous concentrations of flammable or toxic gases
Cthoroughly ventilated for at least 24 hours
Dfree of most flammable gas concentrations
AI Explanation

The correct answer is B) free of all dangerous concentrations of flammable or toxic gases. A fuel tank is considered to be "gas free" when it is free of all dangerous concentrations of flammable or toxic gases. This means the tank must be tested and verified to have safe, non-hazardous levels of any potentially dangerous gases present. Simply inerting the tank with carbon dioxide (option A) or just ventilating it (options C and D) does not necessarily ensure the tank is completely free of hazardous gas concentrations. The other options are incorrect because they do not fully meet the regulatory requirement for a tank to be considered "gas free" - which is the complete absence of dangerous gas levels, not just partial measures like ventilation or inerting.

Related Questions
Q@q.QuestionNumber:As chief engineer, you are discussing with a new third engineer the methods of f... Q@q.QuestionNumber:The airborne concentrations of substances (such as hydrogen sulfide) under which... Q@q.QuestionNumber:The size of the fire hydrant hose connections must be either 1 1/2 inches or ___... Q@q.QuestionNumber:The primary function of an automatic sprinkler system is to _______________. Q@q.QuestionNumber:A segregated ballast system is a system where _______________.

Ready to test your knowledge?

Take a Safety & Environmental - 1st Asst/Chief Practice Exam
Official Resources
46 CFR Safety Equipment USCG Environmental Standards USCG National Maritime Center
← Previous All Questions Next →

Want to practice with timed exams?

Download Coast Guard Exams for the full exam experience.

Get the App