During the design of IPL Section 15-1, LAN prepared an expedited design to lower TRWD’s 90-inch diameter Richland-Chambers pipeline to accommodate future IPL construction. The pipeline could only be taken out of service for 45 calendar days, as a longer duration would jeopardize the ability of TRWD to serve customers. LAN designed the replacement of approximately 1,500 LF of Prestressed Concrete Cylinder Pipe (PCCP) with a new welded steel pipe.

The final design included depths of cover in excess of 25-feet to accommodate future IPL construction activity, and LAN proposed the use of uncoated, cement mortar lined welded steel pipe encased in concrete to provide a similar alkaline environment to the existing PCCP. This minimized cathodic protection impacts from the replacement and also allowed for a much thinner wall thickness for the steel pipe.

The project was completed approximately one week ahead of schedule and was recognized by Engineering News Record in their annual regional awards competition.