Carbon fiber wrapped tanks are actually aluminum and wrapped in CF. Fatigue is what kills HPA tanks regardless of material. Every time a tank is filled, it expands then it contracts on discharge. There is always a fatigue limit before failure occurs, hence, a use time limit. Aluminum has a lower fatigue limit than steel. Adding a CF wraps reduces the expansion and along with that strength and effective life, especially with aluminum. Another cause of failure is water. Water causes corrosion. This can be detected with the use of a borescope. a periodic proof test overpressures the wank with water and the rate of swelling is then measured against a safety standard, but this test is NOT a definitive test with CF wrapped aluminum tanks.. Enforcement of these use rules fall on the shoulders of the guy filling the tank. If that is is you, you need to pay attention and inspect your own tanks. HPA is dangerous, please pay attention and take appropriate precautions.
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