State of Technology Report for Force Main Rehabilitation, Final ...

These limits are reached at different points in time, usually with end of service life (driven by
customer complaints) reached before physical or economic end of life is achieved. However, most
condition assessment activities are focused on the determination of the end of the physical life of the
asset, while it is the end of service life or economic life that drives reinvestment.
One of the key decisions a utility manager has to make is when to rehabilitate an asset from an
economic and service life standpoint. Answering this question is beyond the scope of this report, but
is vital to the asset management of a sewer force main system. This topic will be addressed in a later
research report, which is devoted to decision-making support systems for replacement versus
rehabilitation.
8.8
Demonstration/Verification of Pressure System Rehabilitation
The need at this stage is to demonstrate or verify elements of pressure system rehabilitation. Tables
7-1 and 8-1 set out the needs and the specific elements to verify. All of these are contributors to the
development of an integrated asset management program for the force main element of wastewater
systems. Their verification will enable methodologies and protocols for comprehensive system
rehabilitation programs to be developed that are robust, efficient, and cost-effective. A combination
of demonstration projects to verify capabilities and closing gaps in data and knowledge is essential to
support development of the necessary tools for force main rehabilitation programs. Programs that
allow an owner to reasonably predict the remaining life of a force main that has been renewed with a
liner is paramount.
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