Berkel Rohrtechnik GmbH received the order to rehabilitate two parallel pressure pipelines at a depth of 12.00 m.
The 55-year-old pressure pipelines each have a length of 200.00 m. Due to local conditions, the pipelines had to be divided into three sections each for processing.
The inner surface coated with bitumen showed the typical damage pattern. The burst water bubbles in the bitumen coating led to a strong attack on rust.
The bitumen was completely removed by means of ultra high pressure cleaning. A 10 mm thick cement mortar lining was applied as new corrosion protection.