Question 19Safety & Environmental - 1st Asst/Chief
70% to passA tank has been sealed and unventilated for a long period of time. Which of the following statements is true?
AThe tank is safe to enter.
BThe tank is especially dangerous to enter.
CCarbon monoxide is present.
DWater vapor present when the tank was sealed has oxidized.
AI Explanation
The correct answer is B) The tank is especially dangerous to enter. In an unventilated and sealed tank, the lack of airflow can lead to the depletion of oxygen and the buildup of hazardous gases, such as carbon dioxide, methane, or other toxic vapors. This can create an oxygen-deficient and potentially explosive atmosphere, making the tank extremely dangerous to enter without proper safety precautions and ventilation. The other answer choices are incorrect because A) the tank is not safe to enter, C) carbon monoxide may be present but is not the only concern, and D) the water vapor may have condensed or been consumed by other chemical reactions, but this does not make the tank safe.
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