Rehabilitation of lengthy sewer pipelines by polymer-composite CIPP

This study examines the feasibility of Cured-in-Place Pipe (CIPP) technology for trenchless rehabilitation of aging sewer pipelines, addressing the severe deterioration of Karaganda’s sewer networks. A 3 km section was inspected using CCTV, ultrasonic, and shock-pulse methods to assess pipeline conditions, revealing structural defects with depreciation levels reaching 70-100%. The CIPP method was successfully applied to restore the integrity of 2.6 km pipelines while minimizing excavation, stabilizing the average flow rates and velocity of 0.8-1.2 m pipelines at 710 liter/s and 1.2 m/s, respectively. Hydraulic analysis confirmed that rehabilitated pipelines maintained sufficient flow velocity for self-cleaning and increased capacity, reducing blockage risks. The findings demonstrate that CIPP is a sustainable alternative to pipeline replacement, offering a viable solution for long-length sewer rehabilitation and supporting strategic urban infrastructure renewal.