skip to navigation By Luxfer Gas Cylinders FAQs What are the differences among the terms oxygen service, oxygen mixture, nitrox, enriched-air nitrox (EAN) and oxygen-enriched air? The term oxygen service generally means using pure oxygen (oxygen concentrations of 95% to 100%), but the term is sometimes used more broadly to refer to any gas mixture containing more oxygen than air. READ MORE By Luxfer Gas Cylinders FAQs How often should my Luxfer 6351-alloy scuba tank be inspected? DOT requires requalification (hydrostatic retesting and visual inspection) of all aluminum scuba tanks every five years, regardless of alloy. READ MORE By Luxfer Gas Cylinders FAQs If Luxfer 6061-alloy cylinders are not susceptible to SLC, why has Luxfer exchanged 6061 cylinders that have been reported to have cracks? After the introduction of eddy-current technology, Luxfer received reports of cracking in 6061-alloy cylinders. We accepted returns on about 1,200 of these cylinders to conduct extensive tests. Not a single cylinder was found to be cracked. READ MORE By Luxfer Gas Cylinders FAQs How can I tell if my Luxfer cylinder is made from 6351 alloy? The easiest way is to check the original hydrostatic test date stamped on the cylinder crown. READ MORE By Luxfer Gas Cylinders FAQs How do I know if the person inspecting my cylinders is properly trained? Luxfer recommends taking your cylinder to an authorized Luxfer service center or to an inspector trained by Professional Scuba Inspectors, Inc. (PSI) or the Association of Scuba Service Engineers & Technicians (ASSET). READ MORE By Luxfer Gas Cylinders FAQs Why is it necessary to have my 6351-alloy cylinder inspected with an eddy-current device? When properly used, eddy-current devices contribute significantly to early detection of hard-to-see sustained-load cracks. READ MORE By Luxfer Gas Cylinders FAQs If there have been so few SLC-related cylinder ruptures, why is there so much alarming information about them on the Internet? A great deal of misinformation and exaggeration about SLC is attributable to rumors and inaccurate reports spread by word-of-mouth and the trade press, but especially by the Internet, where the proliferation of inaccuracies is widespread and essentially unregulated. READ MORE By Luxfer Gas Cylinders FAQs Which types of cylinders are most susceptible to SLC-related ruptures? Any type of cylinder manufactured from 6351 alloy could conceivably develop a sustained-load crack over time if subjected to certain conditions. READ MORE By Luxfer Gas Cylinders FAQs How many aluminum cylinders have exhibited SLC? Out of a total population of approximately 1,073,000 Luxfer scuba cylinders made of 6351 alloy, only 1.25% have exhibited SLC. READ MORE By Luxfer Gas Cylinders FAQs How quickly do the cracks grow? Very slowly, as extensive research by Luxfer and outside laboratories has shown. READ MORE By Luxfer Gas Cylinders FAQs What is sustained-load cracking? SLC is a metallurgical phenomenon that occasionally develops in cylinders made of 6351 aluminum alloy, as well as in other types of pressure vessels and structural components under stress for sustained periods of time. READ MORE By Luxfer Gas Cylinders FAQs How long does a carbon composite cylinder last? All composite cylinders have a 15-year service life in accordance with regulations around the world. In the United States, the service life is set by the U.S. Department of Transportation. READ MORE 1 2 3 NEXT Latest articles Luxfer CO2 Cylinders Application Brief - Hydroponics 23 Apr, 2021 / PDF downloads Structural Composites Industries LLC Terms and Conditions 19 Apr, 2021 / Policies Medical Oxygen L6X Composite Spec Sheet 15 Oct, 2020 / PDF downloads Categories CARE AND MAINTENANCE FAQS PDF DOWNLOADS POLICIES RESOURCES AND REGULATIONS SERIAL NUMBERS EXPLAINED TECHNICAL BULLETINS Home About Markets Specifications Support News Careers SEARCH REGION (INDIA) CONTACT SUPPORT HOME SUPPORT CATEGORIES Luxfer Luxfer Gas Cylinders is an operating unit of the Luxfer Group (NYSE:LXFR) of high-technology companies (please visit www.luxfer.com for more information). Events News How to buy Products Alternative fuel SCBA and life-support Medical CO2 Fire extinguisher Sampling Support Care and maintenance FAQs PDF downloads Policies Resources and regulations Serial numbers explained Technical bulletins Privacy Policy Cookie Policy Contact us Colwick Industrial Estate Nottingham NG4 2BH UK Phone: +44 (0)115 980 3800 Fax: +44 (0)115 980 3899 Request information © 2021 Luxfer Gas Cylinders