Case Studies: CIPP Lining Methods and Projects

Case Studies: CIPP Lining Methods and Projects

Polyurethane liner lets city save culvert

Combination truck and CIPP liner used to rehab force main 

Problem: The Allegheny Valley Joint Sewage Authority in Pennsylvania discovered a leaking 20-inch ductile iron and steel force main just upstream from their treatment plant. The fact that the force main crossed over a small creek and was suspended underneath a Norfolk Southern Railroad bridge made the problem more complex. To dig and replace the buried part of the failed line and replace the pipe suspended under the bridge would have significantly interfered with railroad operations, not to mention being extremely cost-prohibitive.

Solution: Insight Pipe Contracting was contracted to reline the force main in order to avoid unnecessary digging and railroad interruption. Upon pre-inspection, the crew found scale buildup on the host pipe from years of use that would interfere with the lining operations. Insight Pipe employed a GapVax MC2008 combination cleaner to efficiently and effectively descale and clean the host pipe. They then used a fiberglass-reinforced Premier-Pipe USA Tech Liner, which is able to comfortably withstand the force main’s 45 psi operating pressure to rehabilitate the failing pipe. The pipe cleaning, installation and curing of the CIPP liner were all completed in the same day.

Result: Internal pipe seals were installed the following day and the force main was quickly put back into service. The quick response and solution helped avoid railroad disruptions and saved the authority close to $1 million. 888/442-7829; www.gapvax.com.


Polyurethane liner lets city save culvert

Problem: The bottom of a 30-foot-long, 80- by 120-inch oval corrugated metal culvert running beneath Forest Lane in East Goshen Township, Pennsylvania, had rusted out. The road is a significant connector between three main suburban Philadelphia traffic routes. No one wanted to see it closed for a traditional dig-and-replace job. Township manager Rick Smith had to decide how to fix it. “Except for the bottom center section of the culvert, the rest was in excellent shape,” Smith recalls. “Replacing it (all) seemed overkill.”

Solution: Abel Recon bid $66,000, nearly a third of the estimate for traditional methods. This included bypass pumping to temporarily relocate active stream flow, and the installation of 600 mils of Sprayroq’s Spraywall structural polyurethane product. Groundwater pressure forcing soil through the missing pipe sections was eliminated with a cement waterstop mix, profiled to the host structure.

Result: East Goshen was pleased with the single-day setup and installation, which required only the placement of traffic cones, rather than road closures and detours. Simplified environmental permitting and engineering provided massive cost savings, while third-party-verified performance provided confidence that it was a long-term investment. 800/634-0504; www.sprayroq.com.



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