What is required for piping materials used in gas systems according to standards?

Piping materials used in gas systems are required to carry stamps or markings to ensure they meet specific safety and performance standards. These markings generally indicate compliance with industry regulations and standards, such as those set by organizations like the American National Standards Institute (ANSI) or the American Society for Testing and Materials (ASTM). Such stamps or markings provide essential information about the material properties, pressure ratings, and the manufacturer, which helps in identifying the suitability of the material for gas service. This is crucial in maintaining safety and reliability in gas distribution systems.

In contrast, while painting, using metal materials, or insulating from heat may have their own benefits and applications, they are not universally required for all piping materials in gas systems according to prevailing standards. Thus, having the proper markings is essential for verification and safety in these installations.