Pressurized underground piping must be monitored for releases by being equipped with what?

For pressurized underground piping systems, the requirement to monitor for releases is crucial for ensuring environmental safety and compliance with regulations. The correct answer emphasizes the use of a line leak detector combined with annual tightness tests.

A line leak detector is designed to identify any leaks in the piping system by continuously monitoring the pressure within the pipes. This device is essential to ensure that even small leaks can be detected quickly, thereby preventing potential contamination of the surrounding environment.

Annual tightness tests complement the functionality of the line leak detector by providing a more thorough evaluation of the integrity of the entire piping system. These tests typically involve verifying that no leaks occur when the system is pressurized, which can be a more sensitive measure than monitoring pressure alone. Performing this test yearly ensures that any potential issues can be addressed proactively before they lead to significant problems.

The other options, while they may suggest methods of monitoring, do not align perfectly with the regulatory recommendations for monitoring pressurized underground piping systems. For example, monthly tightness tests could imply a more frequent testing schedule than what is typically required, and quarterly testing with only a pressure gauge does not provide the same level of assurance as combining both line monitoring and annual testing. Thus, the emphasis on a comprehensive approach with the correct