What color label should exposed copper gas piping have to indicate its purpose?

Exposed copper gas piping should have a yellow label to indicate its purpose. The use of a specific color for labeling gas piping is critical for safety and regulatory compliance. Yellow is universally recognized as the color for warning about gas hazards and indicating the presence of natural gas or propane.

By using yellow labels, workers and individuals can easily identify and differentiate gas lines from other types of piping, such as water or electrical lines, which helps to prevent accidents and ensure proper handling. Each color in labeling systems corresponds to specific functions or hazards, and yellow is firmly established within the industry for this purpose.