What is one requirement before welding occurs in a vessel?

Ensuring that low voltage lighting is provided is a critical requirement before welding occurs in a vessel. Proper lighting is essential for safety and accuracy during the welding process. It enables the welder to see the work area clearly, identify potential hazards, and ensure that the welds are made correctly. Adequate lighting helps reduce the risk of accidents and mistakes that could arise from poor visibility.

When it comes to the other options, they do not satisfy the necessary requirements for safe welding practice. For example, the experience level of the welder does not typically necessitate that they must be new; rather, experienced welders are often preferred. Similarly, heating the vessel prior to welding is not a universal requirement; it depends on the specific materials being welded and environmental conditions. Lastly, while having clean equipment can be beneficial, the idea that it must be shiny is not a standard requirement for welding readiness. Thus, ensuring low voltage lighting is in place is a fundamental safety measure that cannot be overlooked.