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έχω μερικές φιάλες αλουμινίου US DIVERS που στο λαιμό τους
δεν έχουν χαραγμένα τα συνήθη στοιχέια αλλά μία σειρά από τα εξής ψηφία: CTC / DOT 3AL3000P530359 κτλ κτλ....
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How do I know if my aluminum cylinder is made from the 6351-T6 alloy?
As a general rule, you should suspect any aluminum SCUBA cylinder manufactured in the US before 1990 was made from the 6351-T6 alloy. However, different manufacturers ceased using the alloy for production of SCUBA cylinders at different times so the general rule is not precise. Luxfer phased 6351-T6 out over two years and had completely ceased using it by mid-1988, Walter-Kidde ceased SCUBA cylinder production using 6351-T6 in 1989, and Catalina never used 6351-T6. In 1994 the US Department of Transportation (DOT) issued a Safety Advisory Notice #94-7 which identified in detail most 6351-T6 alloy cylinders (including many non-SCUBA cylinders) manufactured in the US. In 1999 the DOT issued a followup Safety Advisory Notice #99-11 which reiterated and supplemented precautions regarding 6351-T6 alloy cylinders. You should consult these notices to precisely determine which cylinders are made of from the 6351-T6 alloy.
Markings:
DOT SP6498
DOT E6498; E7042; E8107; E7235; E8023; E8115; E8364; E8422