Question 1425 Deck General

70% to pass

Which statement about entering into a tank which has been sealed for a long time is TRUE?

A The tank need not be tested for oxygen content if it is ventilated for more than 24 hours.

B The tank must be tested at frequent intervals to ensure that hazardous gasses have not regenerated.

C If the oxygen content tests at less than 12% you should wear an approved gas mask.

D The tank should be tested only once to ensure the oxygen content is at least 14% before entry.

AI Explanation

The correct answer is B) The tank must be tested at frequent intervals to ensure that hazardous gasses have not regenerated. This is correct because when entering a tank that has been sealed for a long time, the atmosphere inside the tank may have become hazardous due to the generation of toxic or flammable gases. Simply ventilating the tank for 24 hours (option A) does not guarantee that the atmosphere is safe for entry. The tank must be tested repeatedly to ensure the oxygen content and presence of other gases remains within safe limits before allowing entry (option B). Options C and D are incorrect because they provide incorrect thresholds for oxygen content and do not require ongoing monitoring of the tank atmosphere.

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