When operating gas cylinders, what should always be checked for safety?

In the context of operating gas cylinders, ensuring safety involves a comprehensive assessment that includes multiple factors. Each aspect listed plays a crucial role in maintaining safe handling and operation.

Color coding is important because it typically indicates the type of gas contained in the cylinder, allowing personnel to quickly identify the contents and understand the potential hazards associated with that specific gas. Misidentification due to color coding errors could lead to serious safety incidents.

Expiration dates are critical as they inform users about the time frame during which the cylinder is deemed safe to use. Over time, gas cylinders may degrade or the contents may become unstable. Using an expired cylinder can pose significant risks, including leaks or explosions.

Physical damage is another essential consideration. Inspecting for dents, rust, or corrosion helps identify any structural weaknesses in the cylinder that could compromise its integrity. A damaged cylinder presents a clear hazard, potentially leading to leaks, failures, or catastrophic incidents during operation.

Given the importance of all these checks in ensuring the safe use of gas cylinders, it's vital to perform a thorough review that includes color coding, expiration dates, and physical condition before any operational activities commence. Thus, it is accurate to assert that all of these factors should be checked for safety.