How often do the back-up oxygen (O2) cylinders in the Deployable Oxygen Generation System - medium (DOGS-M) require hydrostatic testing?

The back-up oxygen cylinders in the Deployable Oxygen Generation System - medium (DOGS-M) require hydrostatic testing every 10 years. This testing is crucial for ensuring the safety and integrity of high-pressure gas cylinders. During hydrostatic testing, the cylinder is filled with a non-compressible liquid, usually water, and pressurized to check for leaks, deformation, and overall structural integrity. The 10-year interval is a standard established by regulatory agencies to balance the need for safety with the practicalities of cylinder use, reflecting the durability of the materials and constructions involved in these systems. Compliance with this testing schedule helps prevent failures that could arise from age-related degradation or material fatigue.