One of the most popular and practiced trenchless pipe renewal techniques is the Cured-in-Place Pipe (CIPP) because the overall installation process triggers minimal disturbance to the communities. It involves inserting a liner saturated with a liquid thermoset resin into the existing pipeline through hydrostatic or air inversion or by mechanically pulling and inflating it. The liner is then cured in place using hot water, steam, or UV light, resulting in the finished CIPP product. Considering the increasing use of CIPP installations and recent industry reports, coupled with a lack of comprehensive studies on CIPP emissions in the past, the objective of this paper is to conduct a comprehensive comparison of previously published studies related to CIPP emissions and their associated potential health impacts. The data collection process was conducted using Publish (Perish) software, including data sets from the Web of Science, Scopus, Google Scholar, and Crossref for a 25-year period, from 2000 to 2025, yielding 268 related publications. Existing studies have been found to be insufficient in accurately measuring worker exposures or the emissions levels in nearby areas where both workers and the public could be affected. Furthermore, the methodologies used in the reviewed papers were often questionable, resulting in inconclusive findings. These studies also failed to consider how variations in pipe characteristics, such as diameter, length, curing temperatures, or the range of volatile organic compounds (VOCs), involved might influence concentrations. As a result, it is recommended that further sampling, data evaluation, and analysis be conducted to gain a more complete understanding of emissions from CIPP installation processes.
Najafi et al. (Thu,) studied this question.