How is a class 3 leak characterized?

A class 3 leak is characterized by seepage that is visible during inspection, indicating a more significant issue than lesser classifications. This classification typically implies that fluid is actively present, suggesting a notable level of leakage that may require immediate attention or repair. The clear visibility of the seepage during inspection sets it apart from lesser classifications where the leakage may be less apparent or non-existent. In contrast, other classifications either indicate no visible leakage or only minor evidence of fluid presence, which does not reflect the severity associated with a class 3 leak. This understanding is crucial in maintenance and operational contexts, particularly in environments where the integrity of systems is vital for safety and effectiveness.