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Special Notice -- 6351 T6 Aluminum Alloy Cylinders: | |||||||||||||||
Effective immediately (June 17, 2020) Scuba Center will no longer fill any Aluminum Cylinder made from 6351 T6 Aluminum Alloy. These cylinders have exhibited a history of SCL (Sustained Load Cracking) and / or rupturing. While these cylinders have not been recalled, this decision was made with the safety of our staff and customers as the utmost priority. | |||||||||||||||
PSI, Inc. (Professional Scuba Inspectors)
states: "Sustained load cracking (SLC), a metallurgical anomaly, occasionally develops in 6351 aluminum alloy high-pressure cylinders. As the name implies, SLC usually occurs in cylinders that remained filled for long periods of time. US manufacturers that used 6351 alloy included Luxfer Gas Cylinders (made prior to May 31, 1988), Walter Kidde, Cliff Impact, Norris Industries (SP6688) and Kaiser (SP6576). The permits for both Norris and Kaiser have expired and those cylinders are no longer approved for use in the US. Luxfer stopped using 6351 alloy by mid 1988 and now provides a complete listing on its web site of dates when various cylinder models were changed to a proprietary 6061 alloy. Catalina Cylinders began making aluminum cylinders in 1986 using a 6061 alloy that is NOT susceptible to SLC." |
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The following is a list of cylinders made of 6351 Alloy that will no longer be filled by Scuba Center: | |||||||||||||||
All Luxfer Cylinders Manufactured Prior to
June 1988. All aluminum tanks under Special Permit # 6498, 922, 7042, 8107, 8364, 8422. All Walter Kidde 3AL Cylinders. All Cliff Impact Cylinders. |
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Thank you for understanding this important safety decision. | |||||||||||||||
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While these are excellent reference materials, in no way should this information be considered a replacement for proper training for the specific type of diving in which you plan to participate. Due to distribution restrictions from many technical diving equipment manufacturers we ship only within the United States. Some equipment may also be limited to in-store sales only. |