Thursday, August 22nd, 2019

Departments of Transportation / Public Works

Culvert and storm sewer piping is frequently located at some distance from the water supplies needed to cure the CIPP using a heat initiated process.  Further, the overland discharge from these drainage structures has necessitated additional controls on the installation contractor to responsibly handle the heat and any possible fugitive styrene concentrations in the processing water used in the CIPP's installation.  Currently the level of the fugitive styrene concentration that would be permissible is still being debated, but the allowable level of the heat in the discharged water is not in question.  It must be brought down to the level that is currently present in the receiving waterway.  UV-light cured CIPP does not need water for the processing of the liner; and, in turn, does not need to discharge any process water to the local environment.

Also of benefit to the culvert or storm sewer pipe owner when employing the UV-light cure CIPP process are the inner and outer foils (plastic membranes) which encapsulate the styrenated resin system keeping it sequestered neatly in place until the resin is fully hardened. Upon completion of the curing process, the inner foil is removed and the exposed fully polymerized resin surface is for all practical purposes clean of any styrene residue that could become washed off with the stormwater run-off.

The ALPHALINER's inherent strength due to its glass fiber reinforcement and its pull-in and inflate method of installation make it the best choice for producing a tight fit with the existing pipe's geometry. Further, the ALPHALINER's ability to expand 8% in size allows it to index tightly with the various corrugated metal pipe profiles currently in the ground.

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