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Western Dam Engineering <br /> Technical Note <br /> <br /> May 2016 <br /> <br />16 <br />Case Studies <br />Project 1 <br />CIPP was used on one project to rehabilitate an old <br />bituminous coated 48-inch corrugated metal pipe <br />(CMP). The downstream portion of the old CMP was <br />replaced with a new reinforced concrete pipe (RCP) <br />and the upstream portion of the old CMP was slip lined <br />with CIPP. The CIPP was installed through an access <br />point at the gate tower and cured with circulating hot <br />water. <br /> <br /> Figure 5 – CIPP installed through gate tower (White <br />pipe is the CIPP and black pipe is used to circulate hot <br />water for curing) <br /> <br />After installation and curing was complete, it was <br />noticed that the CIPP did not fit tightly against the <br />existing CMP and there were gaps between the two <br />pipes. Portions of annular space between the CIPP and <br />the old CMP had to be grouted to fill these gaps. The <br />problems with this installation were thought to be <br />caused by the larger size of the original pipe (48-inch) <br />and the distance from the CIPP manufacturing point to <br />the project site. It was speculated that because of the <br />long travel distance to the site, the CIPP began to cure <br />enroute. <br /> <br /> Figure 6 – Loose-fitting CIPP against Old CMP. <br />(Portions of the pipeline had to be grouted.) <br /> <br />Project 2 <br />In this case, CIPP lining was used to rehabilitate a 24- <br />inch CMP successfully. The CIPP fit tightly to the <br />existing CMP and no issues were noted. The difference <br />between the two projects was that Project 2 had a <br />smaller diameter pipe and the project site was close to <br />the manufacturing location. <br /> <br /> Figure 7 – CIPP Being Installed to Rehabilitate 24-inch <br />CMP <br />