Evaluating the Effects of Host Pipe Shape on CIPP Thicknesses Using MOP 145 Design Methods

ASCE Manual of Practice 145 (MOP 145), Design of Close-Fit Liners for the Rehabilitation of Gravity Pipes, provides design guidance for close-fit liners in gravity pipeline applications for a wide range of cross sections. With the increase in functionality for non-circular cross sections comes a significant increase in the geometric information required to facilitate the design process. Our paper involves a review of multi-sensor sewer inspections (i.e., LiDAR or laser scanning and SONAR) completed in Winnipeg, Manitoba, Canada, and the impact of the observed variation in cross section has on the required liner thicknesses using the MOP 145. The findings of this research are concluded with recommendations for data collection by owners and engineers during the design phase to facilitate a fair and level tendering process. The intent is that our findings will help the industry in developing tailored tendering strategies aligned with MOP 145.