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Evaluation of Exposures to Styrene during Cured-in-place Pipe Liner Preparation and during Pipe Repairs using Hot Water and Steam
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2021/07/01
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Source: Morgantown, WV: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, HHE 2019-0080-3379, 2021 Jul
[PDF-2.25 MB]
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Description:We received a management request for a health hazard evaluation at cured-in-place pipe (CIPP) installations using hot water and steam curing techniques and also at a facility where liners are prepared (wet-out facilities) before being shipped to installation sites. The company was interested in characterizing and controlling styrene exposures to employees during preparation and installation of the liners. Styrene is classified as a probable carcinogen and has been associated with adverse health outcomes in exposed workers, including but not limited to hearing loss, balance and concentration problems, tiredness, and altered vision. Inhalation of styrene has also been associated with the development and worsening of respiratory illnesses. We assessed multiple workplaces during this evaluation. For the wet-out facility, four employees were working inside one facility where the resins were mixed and combined with the liners prior to shipment to the installation sites. An administrative building was within walking distance of the wet-out facility but was not assessed during our site visit. For installations, the workplaces were outside at seven installation sites where employees repaired underground sewer and storm drain lines (pipes) using liners containing resin cured with steam or hot water. Six to eight employees were present at each installation site. Our Key Findings: 1) Company took a proactive approach to employee safety and health. 2) Employees did not always follow permit-required confined space entry protocols. 3) Employees were exposed to styrene emissions from cured liner and other process materials. 4) Worksite conditions and unexpected process difficulties increased employee exposure to the wet liner. Our Recommendations: 1) Reduce employee exposure to styrene and other process emissions. 2) Monitor employee exposure to styrene during short-term tasks. 3) Continue to educate employees on safe work practices for confined space entry according to established company protocols. 4) Continue to educate employees on the safety and health hazards associated with process ingredients. 5) Implement a smoking cessation program for employees.
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Pages in Document:59 pdf pages
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Contributor:Beaty, Mike;Elbon, Barbara;Fortner, Alyson R.;Martin, Stephen B.;Stanton, Marcia L.;Tift, Brian;
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NIOSHTIC Number:nn:20063304
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Citation:NIOSH [2021]. Evaluation of exposures and emissions during cured-in-place pipe liner preparation;and during pipe repairs using hot water and steam. By LeBouf RF, Burns DA, Ranpara A, Kobos L.;Morgantown, WV: U.S. Department of Health and Human Services, Centers for Disease Control;and Prevention, National Institute for Occupational Safety and Health, Health Hazard Evaluation Report 2019-0080-3379,;
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Federal Fiscal Year:2021
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Peer Reviewed:False
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