Wilkinson Environmental Ltd has developed a system for re-rounding deformed pitch-fibre pipes, enabling them to be re-lined.

This system works using two five tonne winches, which pull a specially designed re-round tool through the deformed section of pipe work and forces the pitch fibre pipe to reform and remove any blistering and deformity.

This is carried out three times and then the pipe is flushed out with clean water to remove any debris. A structural CIP (Cured in Place) liner is then installed to prevent the deformity and blistering returning.

This is a beneficial system as there is no need to remove existing manholes and the pipeline can be restored to its original shape without the disruption of a costly excavation.