The Lining Process

The process of lining the pipe initially involves selecting a liner material with an outer diametre greater than the internal diametre of the steel host pipe. The liner pipe is then radially compressed and kept under tension as it is inserted through the host pipe. The tension is then released and the liner pipe expands to form a tight fit against the internal wall of the steel pipe. This process ensures that the liner is fitted in firm contact with the steel pipe, thus transferring all internal pressure to the steel pipe.

The use of a single piece of PE eliminates the possibility of tearing and flaking of the liner. PIHA’s liner selection method guards against the possibility of vacuum collapse.