Which of the following installations is an AOC?

An AOC, or Approved Operating Component, refers to specific elements within a gas piping system that are recognized for their functionality and compliance with safety standards. The installation of flex hoses connecting segments of pipe fits this definition because flexible hoses are typically used as a means to accommodate movement, vibration, or misalignment in the piping systems. These hoses ensure a secure and safe connection while allowing for some degree of flexibility, which is essential in dynamic environments.

Additionally, flexible hoses are generally manufactured to comply with specific standards and regulations, making them suitable for use in various indoor gas piping applications. Their design helps prevent leaks and ensure the safe transit of gas, which aligns with the criteria for components classified as AOCs.

In contrast, solid pipe connections, service connections, and directly installed appliances have distinct functionalities and may not incorporate the same levels of flexibility or adaptability that characterize AOCs. Solid pipe connections provide a rigid assembly that may not accommodate movement, while service connections involve the infrastructure linking the gas supply to the system. Directly installed appliances refer to the equipment themselves, which may not fall under the category of components meant purely for operation within the gas piping system.