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Western Dam Engineering <br /> Technical Note <br /> <br /> May 2016 <br /> <br />17 <br /> Figure 8 – CIPP after Installation <br />Lessons Learned <br /> The location of the project and travel time <br />from the manufacturing location need to be <br />considered when determining if CIPP is the <br />best option and selecting the appropriate CIPP <br />resin and curing system. CIPP may not be the <br />best option for remote project locations. <br /> CIPP may be difficult to install in large <br />diameter pipes, particularly those with non- <br />uniformities, and this possibility should be <br />taken into account during the design and <br />installation processes. <br />Project 3 <br />This project involved the successful CIPP lining of an <br />existing 12-inch CMP outlet conduit. An inspection of <br />the existing CMP pipe showed the pipe needed to be <br />repaired based on the amount of corrosion and <br />seepage into the pipe. The CIPP manufacturer in this <br />case recommended using UV curing identifying the <br />advantages of UV cure; stronger material, thinner <br />walls, and UV/pressure curing allowed the seepage <br />into the existing pipe to be controlled better during <br />installation. The CIPP was installed using the pulled-in- <br />place method and inflated tight against the existing <br />pipe with air pressure. After installation the UV light <br />string was pulled through the CIPP lining for curing. <br />Once curing was complete the ends of the CIPP were <br />cut flush with the existing pipe and Xypex was used to <br />seal the ends of the CIPP. Due to the small diameter of <br />the pipe, a cutter robot was used to go inside pipe and <br />cut out all existing laterals. <br /> Figure 9 – UV-cured CIPP lining installed inside the <br />existing 12-inch CMP <br />Common Pitfalls of CIPP <br />While there are many advantages to using CIPP, there <br />are also common pitfalls and disadvantages. <br /> Successful, high-quality design and installation <br />of CIPP requires a company and personnel with <br />expertise in CIPP and specialty equipment to <br />ensure strength requirements are met. <br />o The installation of CIPP is not a <br />common procedure; a company with <br />expertise in CIPP will ensure the CIPP is <br />not damaged during the shipping or <br />installation process, and that resulting <br />installation will meet quality <br />standards. <br />o Special equipment is required for a <br />proper cure; curing system equipment <br />must be robust, reliable, and operable <br />by the installing crew. <br />o Pressure and temperature need to be <br />monitored constantly throughout the <br />installation and curing processes for <br />most common curing methods. <br /> While transporting and prior to installation, <br />thermally-cured CIPP needs to be kept in a cool <br />environment so early cure of the CIPP does not <br />occur. <br />o Some resins can be sensitive to <br />installation in hot climates. <br />o As shown with the case studies, travel <br />distance from the CIPP manufacturer <br />to the project site should be taken into <br />account. <br /> CIPP installation and curing equipment can <br />include water tanks and boiler trucks for the