What is the main role of the external visual inspection method?

The main role of the external visual inspection method is to check for physical damage on the cylinder. This process involves examining the exterior of the cylinder for any signs of wear, corrosion, dents, or other forms of damage that could compromise the integrity or safety of the cylinder. By identifying these potential issues during inspections, it ensures that cylinders are safe for use and minimizes the risk of leaks or failures that could occur during handling or storage.

While determining internal pressure, measuring gas volume, and ensuring correct labeling are all important aspects of managing gas cylinders, they do not fall under the primary focus of external visual inspections. The inspection specifically targets physical conditions and safety concerns that are visible on the exterior, making it a critical aspect of maintaining the overall safety and efficacy of gas cylinder management.