What method is NOT approved for locating leakage in piping systems?

Visual inspection alone is not considered a reliable method for locating leakage in piping systems. While it can sometimes identify obvious leaks, such as visible corrosion or wet spots, it lacks the sensitivity and precision needed for thorough leak detection. Many leaks may not produce visible signs, or they may be very small and difficult to detect through visual inspection alone.

In contrast, approved methods such as gas detectors and non-corrosive leak detection fluids are specifically designed to identify even minor leaks more effectively. Gas detectors can detect the presence of certain gases, indicating a leak's location based on the concentration, while leak detection fluids can form bubbles when they come into contact with escaping gases or liquids, providing a clear visual indication of a leak. Other approved methods often involve advanced technology or specialized techniques that ensure a comprehensive assessment of the system.