What is NOT a grade E product ________．
A. Dioctyl-phthalate
B. Gasoline
C. Formic acid
D. Creosote coal tar
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What is NOT a function of the scrubber of an inert gas system ________．
A. Cool the inert gas
B. Remove particulate matter like soot
C. Maintain pressure in the tanks
D. Remove chemical impurities
What is NOT a requirement for the safe and effective use of a crude oil washing system ________．
A. Strip all tanks and remove the bottom residue
B. Use an inert gas system while washing tanks
C. Use portable washing machines to reach areas obscured by structural members in the tanks
Debottom the tank used as the source for the tank cleaning machines
To ensure proper seating when closing a valve on a tank，the valve should be ______．
A. Set up as tight as possible by hand
B. Set up tight using a valve wrench
Closed，opened a half turn，and then closed
D. Closed against the stop and the locking pin inserted
What could result in an incorrect oxygen concentration reading on the oxygen indicator ________．
A. Exposure to carbon dioxide for no more than 1 minute
B. Exposure to carbon dioxide for more than 10 minutes
C. Exposure to a very low concentration of sulfur dioxide for no more than 2 minutes
D. None of the above
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