Good asset management calls for utility owners to provide for the life extension of aging pipes where feasible. Products currently in use include Cured-In-Place Pipe (CIPP), pipe relining, and spray on applications. Each of these methods utilizes the existing pipe as a carrier for the new lining. During the installation, the pipeline is taken out of service which results in an interruption in service. Installation and repairs can take from several hours to several weeks. In most circumstances, it remains the obligation of the municipality or utility agency to continue to provide service during the rehabilitation process. To maintain service to customers, a pumping and by-pass system needs to be established before the sewer or water line is taken out of service. Maintenance projects like CIPP and spray on methods tend to follow a performance-based design/build approach leaving the specific application to the contractor. But what about the by-pass? Contractors may not be as familiar with the local environment as the local public works department or engineer. Pre-planning may be needed. By-pass routes, if long or within a congested community, can be an expensive and challenging process rife with environmental permit requirements, evaluation of easement rights/right-of-way, and conditions imposed within intergovernmental agreements. As by-pass systems can be a significant cost component of the repair project, planning and permitting the route in advance of the project can reduce uncertainties for the contractor which many times can yield lower costs to the owner.
Contributor/Source
Joel Koenig, PE
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