Department of Transportation (DOT) regulations require compressed gas cylinders to be hydro-statically tested for leaks and expansion every how often?
a. 1 to 2 years
b. 3 to 5 years
c. 6 to 8 years
d. 5 to 10 years
ANS: D
Safety tests are conducted on each cylinder every 5 or 10 years, as specified in DOT regulations.
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