Which method uses video cameras to visually inspect the inside of sewer pipes?

• A. Lamping
• B. Dye Test
• C. Smoke Testing
• D. Television Inspection

Answer: (D)

Television inspection is the method that uses video cameras to visually inspect the inside of sewer pipes. A camera is inserted into the sewer and is moved through the line, often on a push rod or a robotic crawler, while a monitor records live video (and often stores it for later review). This provides a direct view of the pipe interior, so you can see cracks, root intrusion, misaligned joints, blockages, and overall condition from inside the pipe.

Other methods don’t capture internal imagery: lamping uses a light source to illuminate the inside for a basic look, dye testing traces flow with dye to identify leaks or misrouting, and smoke testing uses smoke to reveal leaks from the surface. Television inspection gives the most detailed, actionable view of the pipe’s condition.