CUIRE Study Finds CIPP Reports Non-Conclusive

Researchers at the University of Texas at Arlington’s Center for Underground Infrastructure Research and Education and the Institute for Underground Infrastructure in Germany have completed a four-month study on the review of published literature pertaining to chemical emissions of styrene-based resin used in the cured-in-place pipe process, finding that existing steam-cure studies use questionable methodologies and, therefore, their results are not conclusive.

Reasons given for this determination include:

  • Because most of the studies measured styrene around the termination manhole, inside the manhole, or inside the sewer pipe itself, maximum values at the outlet point and inside the terminal manhole ranged from 20 to 1,070 ppm, exceeding some exposure limits. However, because workers and the public don’t typically enter or stand directly at the termination manhole in the exhaust plume, this data is flawed.
  • Only four of the studies measured concentrations at locations surrounding the terminal manhole (at least 3 ft away), not in the manhole itself or in the exhaust plume. These measurements are not typical of worker exposures and, therefore, additional worker exposure data should be collected to capture variability in source emission rate, meteorological conditions, and the worker’s location with respect to the terminal manhole.
  • These earlier studies did not adequately capture variations in emission rates from different kinds of pipes (different diameters, lengths, etc.).

The study began in December 2017 and concluded April 6, 2018.


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