A cylinder has "DOT 3AL 2015" stamped on it. What does the 3AL stand for?
a. Manufacturer's initials
b. Constructed of heat-treated, high-strength steel
c. Required to undergo hydrostatic testing every 3 years
d. Constructed of specially prescribed seam-less aluminum alloys
ANS: D
3AL means that the cylinder is constructed of specially prescribed seamless aluminum alloys and must be examined every 5 years to test its expansion characteristics. Type 3AA is constructed of heat-treated, high-strength steel.
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