CarboSeal® References

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Örebro, Sweden

E.ON Örebro discovered a leaking district heating pipeline section under the railroad, close to the Örebro station. The pipes were emptied of water and inspected via video. CarboSeal liners were installed in the feed and return pipes over four days without any effect on the rail bound traffic during the rehabilitation. The work was conducted via two minimal excavation pits, one on each side of the railroad.

Even though the video inspection showed that the pipes had several smaller dimension changesof approximately 10 mm, the CarboSeal liners were easily adaptable.

Steered drilling was considered as an alternative repair method for the project. However, the need for large support structures/barricades in connection with massive excavation pits, together with the substantial requirements forground level measurements prior to, during and after the completed work, made this alternative complex and expensive. The alternative solution would also have cost three times as much as the relining work using CarboSeal.

Vilniaus šilumos tinklai

Vilnius, Lithuania

Vilniaus šilumos tinklai, a company operating the city district heating system in Vilnius, Lithuania, faced a challenge: a DN 500 pipe system embedded in a concrete bridge structure needed renovation. This heavily used bridge contained six traffic lanes, including several electrical trolleybus lines and sidewalks for pedestrians and cyclists. It spanned a 10-track railway yard heading in and out from the city’s central station.The pipes were built into the bridge structure, due to which legislation banned all interventions of the bridge while it was in use. Therefore, if the pipe system had been renewed using traditional replacement methods, city traffic would have been severely affected, and complex and costly alternative rerouting options would have been needed.

Rehabilitation of the pipe system was carried out using CarboSeal DN 500 in September 2022. The liner was introduced to the pipes though a 4 m deep chamber with a manhole entrance from the sidewalk. The sidewalk was slightly narrowed down but kept continuously open for pedestriansand cyclists. The vehicle lanes were completely unaffected during the installation.

The installation of CarboSeal took two days, and the entire operation took five days. The Lithuanian company Poli conducted the installation with the help of PPR personnel on-site.

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