Before servicing a high-pressure oxygen cylinder, it must be:

The requirement to inspect a high-pressure oxygen cylinder for external damage before servicing is crucial because it ensures the safety of personnel and equipment. Any physical damage, such as dents, corrosion, or other signs of wear, can compromise the integrity of the cylinder. High-pressure cylinders are designed to contain gases at significant pressure, and any defects can lead to catastrophic failure, including leaks or explosions. Therefore, a thorough visual inspection helps identify any potential hazards that could jeopardize safety during handling or refilling.

While procedures such as hydrostatic testing, purging with inert gas, and ensuring proper labeling are important in the maintenance and operation of high-pressure cylinders, the immediate requirement before servicing is to ensure that the cylinder is safe and intact to prevent accidents. Thus, inspecting for external damage is the essential first step in this process.