In the OptInspekt project, three different optical inspection systems were systematically tested in the drinking water sector. The aim was to evaluate their limits of application, their practical suitability, and the quality of the data obtained under real conditions.
The reliable assessment of the condition of drinking water pipes poses major challenges for water suppliers. Since conventional methods often only allow statistical statements to be made, the OptInspekt project investigated the potential of non-destructive internal inspections to obtain specific information about the condition of pipes.
The aim was to test three different systems – push camera, trolley and the “Wasserschlange” – under real conditions and to evaluate their possible applications, limitations and data quality. The work included extensive test series in test networks and more than 25 practical applications in real drinking water networks. The investigations included both the insertion of the systems via free-flow hydrants or pipe openings and the assessment of their mobility, image quality, and limitations.
The push camera was used in small-diameter pipes for short inspection distances and stationary long-term observations. It could generally be inserted into the network via a free-flow hydrant.
The trolley is suitable for medium and large pipes. It offers high image quality and can be used for inspection distances of up to over one kilometer.
Based on initial trials with the “Wasserschlange”, the system manufacturer made adjustments to the system. Trials with the modified version in the test network demonstrated the suitability of the system for optical internal inspection and acoustic leak detection in filled pipes.
In parallel with the practical work, a detailed inspection schedule and a risk and hygiene concept were developed to ensure safe use in the drinking water sector. The findings were incorporated into the new DVGW Merkblatt W 492 on non-destructive inspection methods for drinking water pipes, thus creating an important basis for future applications.
