The television inspection leadman will position the van approximately 3 feet from the manhole being accessed. The camera can go in any direction, so the van will set up so as to have minimal effect on traffic.
The two-foot long camera is driven through the sewer main via a two-foot long tractor. At 4 feet, the camera and tractor weigh approximately 75 pounds.
The smallest diameter the camera can go in is a 6-inch pipe. The tractor’s wheels are adjustable and must be set all the way in for the 6-inch inspections.
In order to televise larger diameter pipes, the tires must be removed, and extensions, or larger tires, must be used. In this case, larger tires will be used to televise a 12-inch main.
The District also has two steerable cameras that can be used when the crew needs to inspect mains that turn.
The camera is now ready to be placed into the sewer main.
The camera is lowered into the manhole and set into the channel in the direction the operator needs to go.
The inspection is performed from inside the van, where the operator watches the live video feed and generates an inspection report using the District’s software package, Win-Can.
The television crew averages over 50,000 feet of sewer main televised each month. That’s over 110 miles a year.