How long is the service life of composite oxygen bottles that conform to DOT-E-8162?

The service life of composite oxygen bottles that conform to DOT-E-8162 is 15 years or 10,000 filling cycles, whichever occurs first. This designation reflects regulatory and safety standards established by the Department of Transportation for composite materials used in pressure vessels.

Composite oxygen bottles are designed for durability and reliability, and the specified lifespan is intended to ensure safety during the operation of these systems. After reaching either of the two criteria, whether it's time or the number of filling cycles, the bottles must be retired from service to prevent failures that could arise from wear and material fatigue.

The other options presented do not align with the standards set by DOT. For instance, a shorter lifespan would not reflect the robust engineering typically involved in composite materials meant for aviation use, while an unlimited filling cycle would not adhere to safety regulations, as all pressure vessels have limits based on material performance and integrity over time.