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INSTRUCTORS:
Parisa Beigvand
Molly Sickler
Purpose and Background
These presentations were recorded at the UESI Pipelines 2025 Conference.
A Comprehensive Analysis of Styrene Emissions in Cured-in-Place Pipe Installations Using Polyester (Styrene-Based) Resin Liners Across Multiple Jobsites (24 minutes)
This presentation offers a deep dive into the environmental and worker safety implications of styrene emissions during CIPP installations using polyester resin liners. The speaker begins with an overview of the CIPP process and its advantages, including efficiency, broad applicability, and ability to improve pipe hydraulics. Despite these benefits, CIPP installations raise concerns about volatile organic compound (VOC) emissions, particularly styrene, which is a hazardous air pollutant with potential health impacts. The study compares three job sites using different curing methods, hot water, steam, and UV, while performing real-time and laboratory-based air quality monitoring. Findings showed that steam-cure installations produced the highest emissions but that concentrations generally remained below NIOSH and OSHA exposure limits, except at certain critical locations such as termination manholes. The results highlight that worker exposure, especially near manholes, is the primary concern rather than community exposure. Recommendations include comprehensive real-time monitoring, improved exhaust management, and ongoing research to refine exposure guidelines and enhance jobsite safety.
Experimental Assessment of Trenchless Rehabilitation for Pipeline Bends (27 minutes)
This presentation focuses on experimental research evaluating trenchless rehabilitation technologies in bent pipeline specimens, a less-studied but critical application. The project was part of a large, multi-institutional effort aimed at validating the performance of internal replacement pipes (IRPs) and supporting their approval for field use. Testing involved 12-inch diameter steel and cast-iron host pipes with intentional defects and gaps to simulate field degradation, lined with a spray-applied generic epoxy liner. The specimens were subjected to 500,000 traffic loading cycles and two large deflection events using a four-point bending setup to replicate real-world external loading conditions. Results revealed insights into stiffness changes, strain distribution, ultimate capacity, and liner failure modes under these complex loading scenarios. Findings showed that bent specimens behaved consistently with straight specimens, validating the test methods and indicating that they can provide reliable performance data for complex geometries. The work will inform future ASTM standards and help manufacturers refine installation methods and liner designs.
Benefits and Learning Outcomes
Upon completion of this course, you will be able to:
- Describe the relationship between curing method, jobsite conditions, and styrene emission levels during CIPP installations.
- Identify key monitoring strategies and best practices to protect workers and nearby communities from styrene exposure.
- Explain how bent pipeline specimens respond to cyclic loading and large deflection events compared to straight specimens.
- Discuss the significance of experimental results in developing standards and improving the design and installation of trenchless rehabilitation technologies.
Assessment of Learning Outcomes
Students' achievement of the learning outcomes will be assessed via a short post-test assessment (true-false, multiple choice, and/or fill in the blank questions).
Who Should Attend?
- Utility and Pipeline Engineers
- Design and Consulting Engineers
- Construction Contractors
- Project Managers
- Academic and Professional Researchers
- Early Career and Pipeline Professionals
How to Earn Your CEUs/PDHs and Receive Your Certificate of Completion
To receive your certificate of completion, you will need to complete a short post-test and receive a passing score of 70% or higher within 1 year of purchasing the course.
How do I convert CEUs to PDHs?
1.0 CEU = 10 PDHs [Example: 0.1 CEU = 1 PDH]