What is the typical method for inspecting underground piping?

Flow testing is a typical method for inspecting underground piping, particularly when assessing the integrity and functionality of piping systems in water-based fire protection systems. This method involves measuring the flow rate and pressure within the piping to ensure that it meets the required specifications for proper operation.

Flow testing can help identify potential issues such as blockages, leaks, or deterioration within the piping without the need for invasive techniques. Additionally, it provides data on whether the system is capable of delivering the necessary flow rates during an emergency, which is critical for maintaining fire safety.

While visual inspection could offer insights about above-ground components, it does not effectively assess the condition of underground piping. Ultrasonic testing is more suited for specific thickness measurements or detecting internal flaws in accessible pipes rather than for a general inspection of underground systems. Magnetic particle testing is largely used for detecting surface and near-surface discontinuities in ferromagnetic materials, making it unsuitable for inspecting non-fabric components like piping systems.