A pressure vessel was used to invert the tube, which was cured with steam. |
Michels was able to reline the leaking pipe during a two day session in October 2011. The liner was prepared in at the company's Salem, WA, facility and transported to the site overnight, reducing the time between activating the epoxy resin and the actual pipe installation. This differed from most epoxy methods that require on-site resin preparation. Costs were reduced by preparing the liner in Salem as opposed to assembling an on-site wet-out area.
Michels tackled the project in two separate 275 foot sections. Using a pressure vessel to invert the tube and curing it with steam, each installation took 12 hours. End seals were used to join the liner to the existing ductile iron pipe and after a 150 psi pressure test, the pipe was returned to service.
"The project went as planned in spite of some changing conditions. Michels, the City of Pasco and SEKISUI NordiTube made adjustments on the project to compensate and complete the job," said Chris Tavernier, Michel's onsite supervisor.
SEKISUI NordiTube, headquartered in San Clemente, Calif., offers a variety of trenchless rehabilitation solutions for underground infrastructure, including potable water mains, force mains, gas and industrial pipelines. It is a subsidiary of the global SPR (SEKISUI Pipe Rehabilitation) Group. For more information, visit www.sekisuispr.com.
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