Transportable pressure vessels for high-pressure gases are routinely inspected and tested as part of the manufacturing process. They are generally marked as evidence of passing the tests, either individually or as part of a batch some tests are destructive , and certified as meeting the standard of manufacture by the authorised testing agency, making them legal for import and sale. Most countries require diving cylinders to be checked on a regular basis. This usually consists of an internal visual inspection and a hydrostatic test. The inspection and testing requirements for scuba cylinders may be very different from the requirements for other compressed gas containers due to the more corrosive environment in which they are used. A permanent increase in volume above the tolerated level means the cylinder fails the test and must be permanently removed from service.
Testing and inspection of diving cylinders
Testing and inspection of diving cylinders - Wikipedia
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