B. Manual winches, power winches, TV cable and powered rewinds or other devices that do not
3.03
A.
3.04
A.
obstruct the camera view or interfere with proper documentation of the sewer
conditions shall be used to move the camera through the sewer line.
Whenever non remote powered and controlled winches are used to pull the television
camera through the line, telephones or other suitable means of communication shall be set up
between the two winches, the pumping unit and the monitor control.
Measurement for location of defects shall be at the ground level by means of a meter
device. Marking on cable, or the like, which would require interpolation for depth of
manhole, will not be allowed. Measurement meters will be accurate to 0.2 feet. A
measuring target (or the sealing packer) in front of the television shall be used as an exact
measurement reference point, and the meter reading shall show this exact location of the
measurement reference point.
TESTING
Testing of pipe joints to identify joints that are defective shall be performed using either
liquid or air, at the Contractor's option. Test pressure used shall be acceptable to the
Engineer.
The allowable pressure drop shall be 0.5 pounds in 15 seconds at a pressure greater than 2
pounds per vertical foot of pipe cover, or 4 pounds minimum.
Electronic video equipment shall be capable of displaying and recording, at a minimum, the
following data for each pipe joint:
1. Project Identification
2. Date recorded
3. Footage counter
4. Test pressure
5. Sewer reach identification (street location, start MH and second MH)
DOCUMENTATION:
Printed location records shall be kept by the Contractor which will clearly show the exact
location, in relation to adjacent manholes, of each defect discovered by the television
camera. In addition, other points of significance such as locations of laterals, unusual
conditions, collapsed sections, and other discernible features will be recorded and a copy of
such records will be supplied to the Engineer.
Instant developing of standard size digital photographs of the television monitor at problem
areas shall be taken by the Contractor on the request of the Engineer, so long as such
photographing does not interfere with the Contractor's operations.
02441-3
