Which of the following is NOT a type of sewer inspection?

CCTV, digital scanning, and zoom cameras are all widely recognized methods for inspecting sewers. CCTV involves using a camera attached to a flexible rod that can enter the sewer lines and provide visual inspection data, allowing for detailed analysis of conditions and identification of issues like blockages or structural damage. Digital scanning also helps create a visual representation of the internal condition of the pipes, often capturing high-resolution images for assessment.

Zoom cameras are an advanced option that provides real-time video feeds and can focus on specific areas of interest within the sewer system, making them valuable for thorough inspections.

Pneumatic testing, on the other hand, is not a visual inspection method but rather a technique used to check the integrity of sewer lines. It involves using air pressure to test for leaks. This method doesn't give a direct visual assessment of the pipe conditions but provides information on whether there is a loss of pressure, indicating potential issues within the line.

Understanding these distinctions is essential in sewer maintenance, as different inspection methods serve various purposes in ensuring the proper function and repair of sewer systems.