This publication addresses the techniques for the inspection and requalification of composite overwrapped high pressure cylinders. The use of this publication is required in the United States by Title 49 of the U.S. Code of Federal Regulations (49 CFR) Part 180.205(f)(1), and in Canada by CSA B339, Section 24 [6, 4]. The requalification consists primarily of an internal and external visual inspection followed by hydrostatic testing. This publication highlights those items essential for an accurate appraisal of a composite overwrapped cylinder for compressed gas service. For information on requirements of general cylinder inspection and requalification (visual inspection and hydrostatic testing), refer to the publications listed in Section 3.

It is important to be aware of the design life of the cylinder before filling or requalifying. The user or requalifier must consult the appropriate special permit, permit, or specification to determine the appropriate design life. The composite cylinder shall be removed from service and condemned at the termination of the cylinder design life (i.e., the appropriate period in years following the original manufacturer's test date). Failure to do so is in direct violation of federal regulations and can increase the risk to public safety.

Not all of the considerations for requalification (visual inspection and hydrostatic testing) of composite cylinders are covered in this publication. Questions regarding specific cylinders should be directed to the manufacturer.

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• NFPA 10 : Standard for Portable Fire Extinguishers-Effective Date: 12/17/2012

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