The most basic information needed to define pipeline rehabilitation requirements is the condition of the sewer pipe from a structural, maintenance, and physical dimension perspective.  The most important tool for assessing the condition of a sewer pipe is by means of a detailed internal television inspection (CCTV). Yet, the growth of our communities with their associated new underground infrastructure, along with rehabilitation of existing pipe installations, has generated a growing need for more detailed dimensional inspection techniques.

CCTV (Closed Circuit Television) Inspection is one of the most effective methods used to determine the condition of existing and newly installed pipelines such as gravity flow sewers, above ground industrial piping, gas distribution piping and water mains from a structural, maintenance and physical perspective.

CCTV can be used to:

  • Determine structural conditions
  • Identify shape and material of construction
  • Identify O&M and structural defects
  • Locate service laterals
  • Identify Infiltration & Inflow (I&I)
  • Locate obstructions like roots, grease, debris and cross bores

There are many CCTV cameras available on the market, which function in a variety of pipe sizes.  The rule of thumb is that a camera designed for a small pipe size should not be used in larger pipe because the quality of the picture will be significantly diminished.  Larger pipe should be surveyed by a camera system designed specifically for that application.  Adequate lighting, centering, and focus are critical to a good video picture and a good inspection.  Today’s cameras with their remotely controlled focus and iris functions, light adjustments and the ability to pan and rotate provide the customer with excellent clarity and quality. Major advancements include color CCTV, DVDs, pan and tilt heads, self-leveling cameras and software to manage CCTV video, defect codes, database and photos.

Today, a wide array of CCTV and remote inspection technologies are available and utilize state-of-the-art methods such as sonar, infrared, laser profiling, panoramic imaging, gas detection, 3D modeling, wireless remote control and robotic cutters.