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UV cure provides solution for CIPP repair

News International-French

12 Apr 2012

The Knoxville Utilities Board knew cured-in-place pipe (CIPP) would bring faster, lower-cost repair to an underground sewer pipe in Knoxville, Tennessee, USA.  The 8-inch (203 millimeter) diameter clay pipe had been in service for more than 50 years.

When the pre-installation video showed active leaks in the pipe, engineers were concerned how the deterioration might affect a traditional CIPP liner.  With traditional CIPP, the new liner is impregnated with resin that chemically cures, or hardens, into a solid when exposed to heat.  Active leaking creates cool spots where potentially incomplete cure can result in lower mechanical properties.


Engineers decided to have the pipe repaired with BLUE-TEK® ultraviolet cure technology from Reline America, Inc.  The fiberglass fabric liners for the job were impregnated with Vipel® unsaturated polyester that AOC Resins formulates for UV cure.  Because the resin hardens when exposed to UV light instead of heat, BLUE-TEK impregnated liners are not affected by cool spots.  These liners can also be shipped without refrigeration, unlike liners which cure when exposed to heat.    


“When Knoxville Utilities Board engineers heard that our liner was not affected by active leaks, they decided to use our technology for a pilot project,” said Danielle Verderame, Marketing Coordinator for Reline America.  “The project site was located in a combination residential and industrial area that has very limited access, lots of trees, and is close to buildings. Open cutting and pipe bursting would have been expensive and disruptive options.”


The pilot project for 2,991 feet (912 meters) was awarded to Portland Utilities Construction Co. LCC (PUCC).  PUCC has years of experience in pipe bursting methods but had yet to perform a CIPP repair.  Mike Woodcock of PUCC explained how Reline America technical support and AOC resin quality helped turn the pilot project into a new capability for PUCC. 


“Reline America did an outstanding job in training our crew,” said Woodcock.  “Their team helped us thoroughly learn the technique and become knowledgeable about the equipment and technology. 


“The liners were impregnated with the AOC resin under controlled conditions in Reline’s ISO-certified facility,” Woodcock continued.  “The AOC resin did everything that was expected – reacting smoothly during installation and performing very well in the finished liner.”



The first installation was so successful that right after the pilot phase was finished, the Knoxville Utility Board added 6,533 feet (1,991 meters) to the project for a total of 9,524 feet (2,903 meters).  PUCC continues to get more UV-cure CIPP projects, including work under Phillip Fulmer Way, a busy street near the University of Tennessee football stadium and basketball arena where any manner of excavation can cause major disruption.    


About PUCC

Portland Utilities Construction Co. LLC, specializes in sanitary sewer rehabilitation and replacement services, including video inspection, cleaning, pipe bursting, sliplining, and cured-in-place pipe.  The company has headquarters in Portland, Tennessee, USA, and branch offices in Knoxville, Tennessee, and Houston, Texas.  The company has completed projects throughout the Eastern United States.


About Reline America

Reline America, Inc., Saltville, Virginia, is the exclusive North American partner for BLUE-TEK™ cured-in-place pipe liner and ultraviolet curing equipment technology established by Brandenburger GmbH, of Landau, Pfatz, Germany.  The technology combines a fiberglass fabric impregnated with ultraviolet cure unsaturated polyester resin to produce a high quality, high strength liner inside the host pipe.  


About AOC

For cured-in-place pipe (CIPP), Vipel® resins from AOC process smoothly and perform impeccably time after time. AOC knows technology, lives quality and delivers service better than any other resin supplier. 


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