Why is it important to clear the pipeline before a hydro test?

Clearing the pipeline before a hydrostatic test is crucial to prevent contamination of the test medium. During a hydro test, water or another testing fluid is used to check for leaks and the integrity of the pipeline. If the pipeline is not cleared, any debris, rust, or foreign materials present can mix with the testing medium. This contamination can lead to inaccurate test results or even damage the pipeline during the test. Ensuring that the pipeline is clean allows for a proper assessment of its condition and confirms that there are no leaks or weaknesses in the system.

While minimizing water use, correcting design flaws, and expediting the filling process are valid considerations, they do not directly address the primary concern of maintaining the integrity of the test medium during the hydro test.