Sewer Evaluation

Firstly, sewers are cleaned to remove materials such as sand, grit, gravel, debris, roots, etc. that obstruct the flow of wastewater or compromise the structural integrity of the sewer system. The cleaning is usually done using a hydraulic sewer cleaner having a water capacity of at least 1000 gallons and a pump capable of delivering up to 50 gallons of water per minute at a pressure of up to 3000 pounds per square inch. All debris from the cleaning operation is disposed of at a suitable site approved by the appropriate jurisdiction. Immediately after the cleaning a closed circuit television inspection (CCTV) is performed using a color pan and tilt robot with a camera with sufficient lightning to produce a clear illumination so the entire periphery of the pipe interior can be viewed. Simultaneously, an audio recording of each defect observed, is included in the CCTV inspection report. The CCTV inspection is conducted by inspectors (operators) who are certified by NASSCO through the Pipeline Assessment Certification Program (PACP) and the inspection is conducted and pipe defect recording performed in accordance with NACCO PACP standards.