Sanitary Pipeline Pilot Project after 42 Years of Service in Lima, Ohio

摘要

The Vernon Heights polyvinyl chloride (PVC) gravity sanitary sewer was constructed in 1976 for Allen County, Lima, Ohio. This installation was a trial of PVC (SDR 35) as a new material in the system. Fourteen sanitary sewer lines of eight-inch pipe were installed using the material. As a trial, these flexible pipes have been inspected and documented four times over their forty-two years of service. This paper outlines the results of those inspections, including the most recent inspection conducted in 2018. The 2018 inspection used laser profiling equipment that was not readily available for the previous inspections. The deflections in this trial installation have increased from less than five percent in 1976, at the time of acceptance testing, to as much as thirty-two percent in 2018, after forty-two years of service. The inspections in 1976, 1982, 1989, and 2018 clearly show continuing deflection of the flexible pipes over time.