Granite Inliner Completes Landmark 96” Steam Cure Project

Company renews 1,340 feet of storm culvert pipe under Interstate 70

Granite Inliner successfully renewed approximately 1,340 feet of 48”-96” corrugated metal storm culvert pipe traversing Interstate 70 in Central Indiana with the Inliner Technologies’ method of cured-in-place pipe.

The latest completed project addressed one of a series of large diameter culverts west of Indianapolis to assist the Indiana Department of Transportation in their efforts to renew deteriorating segments of storm sewer pipe along Interstate 70 reaching from the Illinois border to just east of Indiana’s capitol city.

Using the air inversion and steam cure process, the 96” diameter segment – one of the largest steam cured linings to date in the U.S. – presented significant challenges. Typically, CIPP liners in diameters over 72” are wet out via a process called “over-the-hole,” where the resin is injected into the tube onsite as it is being installed. Due to the interstate traffic and lack of easements along the highway, the larger operational footprint associated with an over-the-hole installation was not feasible, requiring improvisation.

“The combination of the large diameter liner, hot temperatures, and busy interstate meant this had to be a carefully planned and orchestrated effort,” said Denise McClanahan, VP of Granite Inliner. “With daytime temperatures in the upper 90s, we modified our typical wetout and installation processes and timing to ensure the success of the install” explained McClanahan. “The flexible nature of CIPP allows for us to take challenging situations and tailor the CIPP to accommodate them.”

Since the liner was too large for a refrigerated truck, Granite Inliner demonstrated additional flexibility by constructing a custom-built trailer to transport the liner. The liner was trucked two hours from Orleans, Ind. to the jobsite near Indianapolis where it was installed before sunrise.

Mike Green, marketing director for Granite Inliner explained that interstate projects, by nature, all carry their own degree of complexity. “In addition to the required attention-to-detail inherent with large diameter CIPP installations, our crews are challenged to establish an efficient means of access, generate precise scheduling and planning for tube arrival and above all, operate within their corporate safety standards always remaining cognizant of the rapidly moving traffic around them.

“Inliner welcomes the challenges presented by large diameter and difficult-to-access pipelines,” Green continued. The project solutions have required us to examine and evaluate each of the components of the CIPP renewal process which include raw materials, mode of transportation, jobsite equipment and our procedures for installation. Each project is unique and offers a variety of issues to address.”

The flexible nature of CIPP – such as the Inliner® CIPP product installed by Granite Inliner – continues to make it a preferred solution for large diameter pipes and roadway culvert rehabilitation.

Posted: October 5, 2017

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