Quality assessment of CIPP lining in sewers: Crucial knowledge acquired by IKT and research gaps identified in Germany

Abstract

Deterioration of buried water and sewer pipes is a significant concern among utilities around the world. Cured-In-Place-Pipe (CIPP) is one of the techniques commonly adopted to rehabilitate pipes. The main purpose of this paper is to provide a brief, but comprehensive, summary of information needed by researchers, engineers and municipalities to recognize the barriers and difficulties that may arise during CIPP sewer rehabilitation work. Thus, this paper outlines the issues and challenges associated with CIPP rehabilitation of main and lateral sewers by analyzing a series of projects conducted by IKT-Institute for Underground Infrastructure in Germany over the last two decades. Finally, ideas for further research are then proposed to reduce the obstacles and risks linked with this technique.