Each 3AA steel cylinder receives an initial hydrostatic test to 5/3 service pressure. That test is documented on the cylinder crown by imprinting the month, year and tester's mark. New cylinder testers use a brand mark, while North American retester's must have a registered mark consisting of a letter and 3 numbers. When a new original test brand mark on a 3AA cylinder is followed by a plus mark (+), the cylinder is eligible for an additional pressure 10% in excess of the marked service pressure. A 2250 psig cylinder with plus (+) may be filled for the valid period of that test to 2475 psig.
Hydrostatic retester's are also authorized to retest a plus marked cylinder to determine whether the wall elastic expansion is low enough to retain the 110% fill. Most retester's choose not to get involved. Some facilities are unwilling to expend the extra effort or don't understand the process, so the steel cylinder owners seldom see a plus (+) after the original test. Since the plus mark is only valid for the duration of the hydro test, unless renewed along with the next retest, the cylinder must not be surplus filled. A hydro retest may, at any time, re-certify an eligible cylinder if he follows the prescribed protocol.
Due to the lack of intelligence or the desire to do a good job, the plus goes to waste
With the amount of over regulation that this industry sees i am surprised you are allowed to even fill the tanks half way up, let alone even fill them to capacity
C The way it was explained to me was if the plus sign is on there (+), then it is oxygen cleaned and therefore ok for ice diving. If there is a (-) sign then it is Oxygen cleaned but not ok for cold water use, but can be used for quarry diving - if tank does not have any (+) or (-), if cant be used for either purpose, unless of course it has the DOT ok but only if it is within vaild hydro and VIP
in all cases it can not be filled to its actual capacity because it would require attention to detail and a desire to a good job
As for jail - i suspect only those who make issues of the actual regualtions will be punished, even if they dont make any sense -
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