REHABILITATING SANITARY SEWER USING FRP

Dibble is providing engineering, construction administration, and inspection services for the City of Scottsdale to rehabilitate approximately 5,279 linear feet of vitrified clay pipe (VCP) and ductile iron pipe (DIP) sanitary sewer (approximately 13 pipe segments) ranging from 24 to 30 inches in diameter. The design also includes the rehabilitation of approximately 36 sanitary sewer access manholes. The project location is along the northern border of the Salt River Pima-Maricopa Indian Community (SRPMIC) from SR 101L to 104th Street, and along 104th Street and Via Linda north to Shea Boulevard. The engineering services are related to guaranteed maximum price (GMP) preparation, construction, and the post-construction phases of the project.

During the assessment phase, severe corrosion was found in segment 49 (30-inch-diameter pipe) where the VCP ends and transitions to the concrete manhole. Dibble designed fiber reinforced polymer (FRP) rehabilitation to mitigate the corrosion and reinforce the pipe strength at that section. FRP’s corrosion-resistant properties will provide a long-lasting connection in the sewer system. The internal application of the FRP at the connection points does not reduce the inner pipe diameter and therefore does not change the flow volume of the pipe.

The Dibble team was onsite during installation and testing and performed a special structural inspection of the FRP composite system.

Project Lifecycle