#3083
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luxfercylinders.com/support/technical-bulletins/4...-6351-aluminum-alloy
phmsa.dot.gov/pv_obj_cache/pv_obj_id_8DDCA19A9084...filename/3al3000.pdf
phmsa.dot.gov/pv_obj_cache/pv_obj_id_07162D61C544...me/3al2015_57003.pdf
ctcseminars.com/Files/Technical/3al_advisory.pdf
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Luxfer Gas Cylinders
Technical Bulliten
October 17, 2002
Dates by models when Luxfer changed the aluminum alloy in its scuba tanks from 6351-T6 to Luxfer’s proprietary 6061-T6 alloy.
Scuba tank model.................................Date of alloy change
S808.............................................. ....................5/87
S72............................................... .....................8/87
S100.............................................. ....................8/87
S80............................................... .....................1/88
S50............................................... .....................4/88
S92............................................... .....................4/88
S30............................................... .....................5/88
S63............................................... .....................5/88
S40............................................... .....................6/88
This information relates only to cylinders manufactured in the U.S. Cylinders manufactured in Australia are subject to different dates.
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Here is "The List" of scuba tanks that the DOT says are most likely made
from the :
· All DOT-3AL tanks manufactured under one of the following
exemptions or special permits: 6498, 7042, 8107, 8364, 8422
· All composite cylinders manufactured under one of the following
exemptions: 7235, 8023, 8115
· All Walter Kidde DOT-3AL scuba tanks.
· All Cliff Impact DOT-3AL scuba tanks made before July 1990.
· All Luxfer 80.8 cu. ft. scuba tanks (S80.8) made before May 1987.
· All Luxfer 72 and 100 cu. ft. scuba tanks (S72, S100) made before
August 1987.
· All Luxfer 80 cu. ft. scuba tanks (S80) made before January 1988.
· All Luxfer 50 and 92 cu. ft. scuba tanks (S50, S92) made before
April 1988.
· All Luxfer 30 and 63 cu. ft scuba tanks (S30, S63) made before May
1988.
· All Luxfer 40 cu. ft. scuba tanks (S40) made before June 1988.
· All other scuba tanks made in the US before February 1990 (except
Catalina).
· All scuba tanks not made in the US.
Unless proven otherwise, all scuba tanks in the above list should be
assumed as being made using the 6351-T6 alloy.
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