In addition to the research report, the project developed a
Guidance Manual that provides easy-to-follow steps for water
utilities to assess their own AC pipe inventory and to determine
rehabilitation and replacement needs. It also provides pointers on how to safely execute all AC pipe-related activities while
considering asbestos handling regulations and legislation. The
Guidance Manual places the key results reported in the full report
into the context of risk management and economic-based decisions, which can be used as a guide to manage AC pipe inventories. Lastly, the project also produced a multimedia presentation
that previews the results and provides links to resources.
Large Diameter CI Mains
FOR HUNDREDS OF years, large diameter transmission (trunk)
mains have been an essential and critical component of the water
Asbestos Cement Pipe
ASBESTOS CEMENT (AC) pipe constitutes roughly 12 to 15% of
the total length of pipe in drinking water distribution systems
in the United States and Canada. In some utilities, AC pipes
comprise up to two thirds of the total pipe inventory in use. It is
important for utilities that own a significant AC pipe inventory
to maintain, manage, and eventually replace or rehabilitate this
aging asset in a way that meets economic, social, and environmental needs, and/or regulations.
Long Term Performance of Asbestos Cement Pipe (project #4093,
Hu, Wang, and Chowdhury) explored the current conditions and
state of the art in management of AC water main assets. This
included pipe deterioration and failure, condition assessment,
remaining service life prediction, repair, rehabilitation and
replacement, and health and waste management protocols.
Utilities need tools and strategies to optimize the use of condition assess- ment and risk management in making infrastructure renewal deci- sions and using innovative renewal techniques. In 2013, Water Research Foundation (WRF) completed three projects that address infrastruc- ture renewal and replacement on three different types of pipes: asbestos cement, large diameter cast iron (CI), and small diameter CI.