During a timed pressure drop test, if a pressure increase is detected due to thermal expansion, what should be done?

In the scenario of a timed pressure drop test, if thermal expansion causes a pressure increase, it is essential to repeat the test to ensure that the results are accurate and reliable. Thermal expansion can create false readings that do not reflect the actual system's integrity or leak tightness. When an increase in pressure is observed, it suggests that the initial conditions of the test may have been altered due to temperature changes affecting the volume of the gas or liquid in the system.

Repeating the test allows for a controlled environment where the impacts of thermal expansion can be minimized or negated. This ensures that any potential leaks or issues are accurately detected based on consistent test conditions. It is critical for the integrity and safety of the system being tested to verify that the readings reflect true performance and not external influences like temperature variations.

Recording the pressure increase is also important, as it provides data that can help in troubleshooting or analyzing system performance over time, but it does not replace the necessity of conducting the test again for valid results.