Trenchless Technology

SEP 2018

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Page 60 of 83

The Problem To determine the severity of structural damage to the pipe- line, INBODE performed a CCTV video inspection , which identi•ied a high degree of deterioration, •issures, cracks and drag — causing water to escape into the surrounding earth and generate shifting and sinkholes. The Solution The CIPP installation presented great challenges in engi- neering and logistics. INBODE installed a polyester felt liner that was 2.13 m (84 in.) in diameter with a high-density polyurethane coating and a thickness of 36 mm — reinforced at speci•ic points to 46.5 mm, with a total length of 209.5 m. The liner was impregnated with 61,235 Kg (135,000 lbs) of AOC 's Vipel L704-TAP-30, a thermally activated isophthal - ic polyester resin manufactured by AOC in Mexico. L704- TAP-30 was speci•ically developed for use in rehabilitating large diameter pipes and provides the corrosion resistance, durability and toughness required for CIPP applications. Challenges A mobile warehouse was installed on site to manage the short disruption of service and execute the complex instal - lation more easily. A bypass pumping system was installed to re-direct 2,200 lps (liters per second) of wastewater and provide the conditions necessary for liner installation. Before the CIPP process could begin, a comprehensive cleaning and inspection was needed. INBODE used hydro pneumatic sewer cleaning equipment to clear up to half a ton of accumulated silt , stones, tree branches and other de- bris that were obstructing •low. Prior to liner installation, IMBODE performed a •inal video inspection to ensure the removal of all debris, identify service connections and as- sess pipe conditions. The host pipe was now ready for the liner to be introduced. Installation IMBODE impregnated the liner with Vipel L704-TAP-30 resin on- site using equipment , which included: an automat- ed static mixer for introducing the resin and catalysts; a vac- uum system, calibration rollers; a 6.9 m inversion column to ensure even application to the host pipe; and a boiler truck with a capacity of 40 million BTUs (heat units) all operated by specialized personnel according to ASTM F1216-16 stan- W W W.T R E N C H L E S S T EC H N O LO GY.C O M 61 INBODE installed a polyester felt liner that was 2.13 m (84 in.) in diameter with a high-density polyurethane coating and a thickness of 36 mm.

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