The TV Inspection Camera is heading downstream with the flow in a city sewer main located in a residential and restaurant area. Solid grease is adhering to the bottom sides of the sewer main. Further down the pipe we come to a private sewer service connection to the City main. As water is flowing out of the service, it is surrounded by a heavy deposit of grease at the connection and downstream as well. At this point in the City main, the TV Inspection had to stop and the camera could not go any further because of the severe grease buildup. Another crew operating one of our hydrocleaners had to be dispatched to the scene and clean the line so the TV Inspection could proceed.
Cleaning a Sewer Main
This video clip shows what it looks like on the inside of the pipe when a hydrocleaner is cleaning a sewer line and, in this instance, a sewer line with grease deposits. This older concrete pipe has an interior lining that is no longer smooth and has exposed aggregate and small voids where grease can attach itself. The nozzle that you see is spraying water under high pressure as the cleaning hose is being dragged with the flow back to the hydrocleaner truck. The 2,000 pounds per square inch of high water pressure and 65 gallons per minute of flow volume helps to scour the pipe walls and wash away the debris. Heavy grease accumulations require more frequent cleaning cycles to prevent sewer backups and Sanitary Sewer Overflows (SSOs).