Question 1425Deck General70% to pass
Which statement about entering into a tank which has been sealed for a long time is TRUE?
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.
Related Questions
#1423 Which step is NOT generally taken when gas-freeing a tank? #1424 Which statement about entry into a space that has been sealed for a long time is TRUE? #1426 A marine chemist issues gas free certificates and is certified by the _______________.#1427 You have been carrying a liquid with flammable limits of 1% to 7% mixture with air. If your instructions say that no one shall enter the tank if the vapor concentration is over 15% of the LEL, what is the maximum allowable percentage of vapors for men to enter? #1428 Which type of portable lighting may be used to enter a compartment on a tank barge which is NOT gas-free?