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Sewer inspections

Whenever road construction works are scheduled, it is of utmost importance that the condition of the existing sewerage is known and defects, if any, are mapped. On the other hand, camera inspections are also performed upon the delivery of newly installed pipes to identify and repair installation faults.


Using a cable (with a length of 300 to 400 m) several cameras are connected to control devices that are mounted in light-duty trucks or SUVs. From these control points, the cameras are controlled (speed, exposure, image sharpness, etc.) and the condition of the pipes can be immediately assessed. 

In order to obtain a complete picture of the sewerage (pipes, joints and connections), the cameras are equipped with a rotating head that can be moved into all directions. This makes it possible to obtain a perpendicular image of the pipe wall, to inspect in-house connections and to visualise complete joints. The monitor continuously displays the distance (with an accuracy of 0.01m) travelled by the camera as from the set point of departure. 

Also the inclination of the camera in longitudinal direction can be displayed on the monitor. Using these measurements, a longitudinal profile can be drawn through which any subsidence in the sewerage can be clearly depicted. Additional information such as location, examined track, photograph number, etc. can be displayed on the image. 

In addition, the width of joints or an angular displacement, if any, can be measured using a laser. 

The entire inspection is recorded digitally and for the main defects pictures of the monitor image are taken. To do so, the camera is stopped and the rotating head is targeted onto the defect. The nature of the defect can be indicated by way of text on the monitor. 

A video camera for inspecting wells is used to inspect sewage systems without requiring a relatively expensive prior cleaning. To this end, a fixed camera is vertically lowered into the inspection channel; this camera zooms in on all directions of the pipe so that all defects can be identified. 

Detailed report 

An inspection report is drawn up and sent to all stakeholders. It includes the following elements: 

  • a written report in which all observations are mentioned, including a classification according to the prevailing standard
  • a DVD covering the entire inspection
  • photographs of the main defects
  • if applicable, plans with indication and numbering of inspection channels

Camera types

GEO Measuring & Analysis nv has disposal of a complete range of cameras that can be adjusted to the different inspection conditions:

  • push cameras for pipes with a diameter between 80 mm and 150 mm
  • explosion-proof, self-travelling cameras for pipes with a diameter between 150 mm and 1500 mm
  • video cameras for inspecting wells

Industriepark Rosteyne 1

9060 Zelzate

Tel. 09/326.86.30

Fax 09/326.86.31

Email gma@groupvanvooren.com

Website www.groupvanvooren.com