What material is typically marked for identification in fuel gas systems?

In fuel gas systems, metal is typically marked for identification due to its properties and the standards established for safety and code compliance. Metal components, such as pipes and fittings, are often subject to specific regulations that require proper identification to ensure safety in handling, maintenance, and operation. The markings may include information about the type of gas being transported, pressure levels, or installation date, which are critical for personnel who need to work with or around these systems.

Marking metal components helps prevent accidents and ensures that those who are involved in installation or maintenance activities can easily identify the system's specifications and service requirements. This practice aligns with national standards and codes that emphasize the importance of proper labeling to mitigate risks associated with gas leaks or improper handling.