Critical Data Needs Associated with Asbestos Cement Pipe Renewal Methods

Abstract

Asbestos cement (AC) pipe accounts for approximately 15% of the total length of water distribution system piping in North America. Pipe renewal activities are needed to maintain these pipes as they deteriorate, but concerns over the environmental impact and regulations associated with these construction methods are largely misunderstood. Confusion around these issues led this study to determine (1) what the regulations allow, (2) which renewal methods are applicable, and (3) the critical data needs associated with these methods when used for AC pipe renewal. This paper describes current AC pipe renewal regulations and practices (e.g., pipe bursting, cured-in-place pipe lining, etc.) and the critical data needs relating to AC pipe renewal (e.g., study of the asbestos fibers released in air, water, and soil during construction). These findings are valuable for water utilities in need of solutions for renewing their aging AC pipes and in understanding regulations. The recommendations highlight the needed investigation into the environmental impact of AC pipe renewal construction, which when completed will help clarify future regulations.