In the context of pipeline testing, what is one sign that a leak may be present?

Unexplained drops in pressure during a pipeline testing scenario are a strong indicator that a leak may be present. Pressure testing is a common method used to identify leaks; during this process, a test medium (often water or air) is used to pressurize the system. If the tested system is intact and sealed properly, the pressure should remain stable. However, if a leak exists, the pressure will drop because the test medium escapes through the opening. This loss of pressure suggests a breach in the pipeline, warranting further inspection and repair.