Piping shall be labeled by?

The correct answer is based on the standards for labeling piping systems in medical gas installations. Piping must be clearly labeled to ensure safety and compliance with regulations, allowing for easy identification of the gas supply and hazards associated with each gas.

Stenciling or using adhesive markers provides a clear, visible, and durable method for labeling that can withstand the conditions typically present in medical environments. This method allows for consistent labeling across different installations and ensures that the labels can remain intact over time, which is critical in high-utilization areas like hospitals.

Engraving, painting, and stamping are methods that can sometimes be used, but they may not provide the same level of flexibility and clarity for all situations as stenciling or adhesive markers. For instance, engraved labels may not be as visible from a distance, and paint might fade or chip, reducing legibility. Therefore, the chosen method of stenciling or adhesive markers is best suited for ensuring proper identification of medical gas pipelines, contributing to overall safety and compliance in medical facilities.