Pressurized underground piping must be monitored for releases. What is a requirement for this monitoring?

The requirement for monitoring pressurized underground piping for releases is highlighted by the need for annual line tightness tests. These tests are crucial as they assess the integrity of the pipelines, ensuring that there are no leaks or releases into the environment. By conducting these tests on an annual basis, operators can detect small leaks before they escalate into larger, more hazardous problems, thereby maintaining safety standards and regulatory compliance.

In addition to annual line tightness tests, it's important to note that continuous online monitoring can provide real-time data on the state of the piping, but this is not the only standard method required, and it may not be feasible for all facilities. Daily visual inspections and monthly maintenance checks contribute to regular oversight but do not meet the specific regulatory requirement for testing the lines' integrity through line tightness evaluations.