What do the piping service symbols "A", "G", "O" represent?

The symbols "A", "G", and "O" in piping service typically represent air, gases, and oil. The correct representation is foundational in understanding how different substances are conveyed through piping systems, particularly in industrial and engineering contexts.

Air is a common utility in many systems, used for pneumatic tools, ventilation, and other processes. Gases can encompass a wide range of substances, including natural gas, helium, and others that may be handled via similar piping systems. Oil is also a significant component in various industries, especially in applications requiring lubrication, fuel, or other specific uses.

This identification is crucial for safety and operational efficiency within a facility, as each type of fluid or gas has its own handling requirements and safety protocols. Recognizing these symbols allows personnel to quickly and accurately understand the purpose of each piping line, which is vital to maintaining safe and effective operations.