[Case Study, August 2009] -- Pipeline inspection systems such as CCTV are most commonly used to find defects and assess conditions in existing pipelines that have been in service sometimes for many decades. However, currently Oy DigiSewer Productions Ltd (DSP) is involved in a project to ensure that a brand new raw water pipeline is being installed to the highest standards. Using the company's DigiSewer® system, supplied by Painehuuhtelu Oy PTV, DSP is surveying inside the newly laid pipeline section by section.
The purpose of the survey is to determine that neither the pipe joints nor the concrete lining coating within the pipe have been compromised during the installation process, ensuring that the installation quality of the construction is kept to the planned level to achieve the 100 life expectancy.
Commenting on this new market for the DigiSewer® system, Sakari Kuikka, Director of Oy DigiSewer Productions Ltd said: "To work with DigiSewer® on this kind of 'new pipeline after installation project' is fast, accurate and trustworthy way to control the quality of newly installed pipelines. This gives the survey contractor the possibility to provide more accurate information than with 'normal' CCTV inspection and could also save on costs and provide better profitability."
"DigiSewer® data is very easy and fast to process and enables us to see the quality of the installed pipeline immediately." said Managing Director Jyrki Valtonen, M.Sc. of Turun Seudun Vesi Oy. "This is one part of our security program to reach the planned 100 year life expectancy of this pipeline."
The DigiSewer® System
The DigiSewer® system is designed to be a fast and reliable method of measuring the condition of a pipe and storing this information into a digital format. It provides automatic interpretation of condition data collected to a dimensional accuracy of 1 mm using specially designed data analysis software. This makes the actual survey, data collection and interpretation process operator free. This is achieved because the viewing head of the DigiSewer® system is designed to scan the whole of the inner pipe wall around its full 360° circumference in the one operation, unlike conventional CCTV which requires operator intervention to reposition the camera head to view defects, laterals and joints during a survey.
Unlike with conventional CCTV survey systems, DigiSewer® tends to be referred to as a condition 'measurement' of the pipeline as opposed to an 'inspection'. This is because the data collection achieved with the DigiSewer® system provides a level of accuracy not possible with conventional systems.
Also, as compared to conventional CCTV surveys, the speed at which the collected data can be reviewed by analysts can be as much as five time faster.