PHOENIX, AZ PIPE REHAB
OWNER: City of Phoenix
LOCATION: Phoenix, AZ
VALUE: $9,208,628.00
The project included the lining of 8,899 linear feet of 69 to 87 inch sanitary concrete sewer pipes using the Cured-In-Place-Pipe method. These liners were installed using the “over the hole” procedure. This type of installation requires the impregnation and installation equipment to be positioned in the street right-of-way during this operation. These liners require approximately one week on a 24 hour schedule, preparing, installing and curing the liners. Since the resin that is used in the liner is temperature sensitive and the existing temperature of the City of Phoenix was between 105 degrees and 114 degrees, it was imperative that the liner be installed as rapidly as possible. To keep air and water that is used during the installation operation in the proper ranges, portable air conditioning units and water chillers were utilized.
A bypass system was required to redirect up to 145 million gallons a day of sewer flow using a combination of 12” and 16” diameter pumps into a total of eleven 20” and 24” fused HDPE discharge pipes. Each one of the HDPE pipes was approximately 6,600 lineal feet in length. The suction pit for the bypass operation was approximately 110 lineal feet in length, with the top quarter of the existing sewer removed to allow for the numerous suction lines to be inserted. After the sewer flow is redirected, the liner is fed into the original pipeline through an opening in the existing pipe. The liner is then heated until it is cured. The team also rehabilitated approximately 21 manholes. The project finished on the scheduled completion date in August 2004.