The Tools and the Process of Sewer Line Inspection
A sewer pipe inspection is done before and after the whole process of the trenchless rehabilitation of the pipe. It is necessary to inspect the sewer pipes before rehabilitating it to give the contractor an idea on the measurement of the pipe in terms of its diameter and length. Inspecting the sewer pipe after the process is also done to ensure that the new pipe is well installed and the whole process is properly performed. This is also to know if there are some damages in the pipe that are left behind or unaided. A pipe inspection is a better option to check for some damages in pipes than to excavate the soil. The inspection is important for the contractors to perform the process well and accurately and also to avoid improper repairs. Tackled in this article are the equipment used in the sewer pipe inspection and the sewer inspection process.
Equipment Used in Sewer Pipe Inspection
- Service Truck
The service truck is somewhat a small generator which holds the power supply. It is a small air-conditioned stall that has video recording and monitoring equipment. This is where the contractor stays to inspect the pipes through the monitor which displays the record.
- Cable and Winch
A powered reel that has a video cable built-up with a steel wire braid or a kevlar is located at the back of the truck. A powered winch is also used to allow the inspection equipment to lower and retrieve in the pipe line.
- Inspection Camera
An inspection camera is also known as a pipeline inspection gauge or PIG. The lights and the camera are firmly fixed in the swivelling head connected to the cylindrical body. The camera head can be moved or operated remotely. Lighting devices such as LED lights are combined in the camera head to give light in the sewer pipe. The winch, which is a long cable wound, the view of the camera can be displayed on the monitor of the computer. To precisely measure the diameter of the pipe including other data, some companies would prefer to integrate a series of lasers.
Sewer Inspection Process
- Using a Camera Tractor
The service truck is stationed at the access point of the sewer pipe. The camera tractor is set down and moved forward in the sewer pipe. The contractor starts monitoring and operating the camera tractor remotely in the service truck. Once the inspection is completely done, the camera tractor is then operated in a reverse gear and at the same time, the cable is settled. If the camera tractor is near the access point, it is then pulled up.
- Pulling the Camera Backwards
The tractor mechanism might not have enough room if the pipe has a small diameter. As a substitute, a rigid ‘fish’ is then used. It is attached to the rope of the access point and is the one pushed in the pipe. The fish is pulled to put the rope near the pipe. The inspection pig and the cable is pulled from the pipe through the use of a rope. To pull the PIG backwards, the cable used.