Trenchless Technology

SEP 2018

Trenchless Technology is the premier communications vehicle for the trenchless industry. Through our multiple platforms, readers receive insights into the trenchless industry, as well as keep connected to the latest news, products and projects.

Issue link: http://digital.trenchlesstechnology.com/i/1027736

Contents of this Issue

Navigation

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.

Articles in this issue

Archives of this issue

view archives of Trenchless Technology - SEP 2018