|Luxfer aluminum scuba cylinders
for oxygen-enriched applications in the U.S.A.
RIVERSIDE, Calif. (July 23, 2004)—Oxygen-enriched service for scuba applications, including 1 “nitrox” service, is defined as use of a breathable gas mixture with elevated oxygen content above that normally 2 found in air. A Luxfer aluminum scuba cylinder may be used for oxygen-enriched service only if the cylinder has been properly cleaned and maintained for such service.
All Luxfer scuba cylinders manufactured since January 2000 were properly prepared for oxygen-enriched service when shipped from the factory. However, if a cylinder has not been maintained in a proper state for such service, it will be necessary to clean and properly prepare the cylinder before filling it with an oxygen-enriched mixture.
All system components used with a cylinder in oxygen-enriched service—including the valve, regulator and connections—must be oxygen compatible and properly designed and prepared for oxygen-enriched service.
Actual cleaning procedures will vary depending on the condition of a given cylinder and the possible contaminants to which the cylinder has been exposed. Once a cylinder has been properly cleaned and prepared for oxygen-enriched service, the cylinder should be tested and certified “oxygen clean” by an authorized laboratory. (For example, the laboratory will test to make sure that the cylinder meets the regulatory standard for hydrocarbon content, since hydrocarbon content in excess of the standard poses a fire danger in the presence of oxygenenriched mixtures.)
Failure to prepare a scuba cylinder properly for oxygen-enriched service, failure to conduct subsequent testing or failure to use only oxygen-compatible components could result in serious personal injury or death and property loss or damage.
This Luxfer Technical Bulletin supersedes all previous Luxfer statements on this subject.
Reference Luxfer Technical Bulletin dated July 23, 2004 The U.S. Compressed Gas Association (USCGA) and U.S. Occupational Safety and Health Act (USOSHA)
1 define oxygen-enriched service as breathable air with oxygen in concentrations above 23.5% by volume. In all matters concerning gas filling, gas handling and percentage of oxygen content, Luxfer defers to USCGA publications. The term “nitrox” is broadly used in the scuba industry to refer to various breathing mixtures with variable oxygen content. However, in government regulations around the world, there is no single, clear specification for what constitutes “nitrox.”