Learn how a Smart City experiences a $4.5 million Cured-In-Place Pipe (CIPP) lining failure and turns the tables on a national supplier to test and certify that their liner installation caused their liner failure. Despite not wanting to engage the same CIPP Contractor responsible for their previous projects that saw their liner fall apart like raw oatmeal being pulled out of the oven too soon, see how a California city set-up a CIPP Benchmark to see whether ASTM F2550, Standard Practice for Locating Leaks in Sewer Pipes By Measuring the Variation of Electric Current Flow Through the Pipe Wall, can be successfully used to find defects in CIPP, before acceptance.
Let us put you in touch with one this Hero Wastewater Superintendent that has the same CIPP contractor begging to get back in with the City.
By having a CIPP supplier be tested with ASTM BEFORE and AFTER lining, it was found that the CIPP supplier actually made the pipe leak more AFTER lining, than BEFORE lining, finding larger holes were made at two lateral connections than were originally there.
In addition to finding dozens of pinhole leaks, the Post-CIPP liner, was clearer not what the City wanted moving forward.
Representing a felt liner that was steam-cured, the CIPP liner required immediate repairs by City crews.
The aha moment came when the newly selected CIPP contractor passed ASTM F2550 with flying colors. Of course, the contractor had never been tested with ASTM F2550 before and asked Electro Scan to pre-test a few of their liners being installed at a large San Francisco Bay Area city that extensively uses CIPP to reline its sewers.
Unfortunately, after learning that their CIPP liners had excessive leaks and defects at lateral connections, just like the original CIPP. supplier, the new CIPP supplier said that it would simply increase its resin-to-felt ratio.
Asked why they weren't using an increased ratio on the other City, the CIPP contractor said that the City only used Closed-Circuit Television (CCTV) cameras to 'test' their liners.
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