Washington PCCP Pipeline Rehabilitation
In March 2013, Washington Suburban Sanitary Commission (WSSC) contracted a third party inspection company to perform an electromagnetic survey to assess the condition of their 2,990 ft of 66-inch PCCP pipeline. It was found that numerous sections of the inspected 66-inch line had broken pre-stressed wires and were structurally unsound. Thirteen of these pipe sections were in the vicinity of Interstate 270. WSSC conducted feasibility studies and determined the traditional remove and replace option for these distressed pipe sections would not be practical and contacted Fyfe to consider a carbon fiber reinforced polymer (CFRP) retrofit of the damaged segments of pipe.
The Owner decided to rehabilitate the deficient pipe sections with CFRP, which has been introduced as a repair alternative for failing pipe sections and joints as well as other emergency applications that afford a shortened construction schedule, minimal curing time and immediate return to service conditions and pressures.
Fibrwrap Construction installed Fyfe Company’s Tyfo® SCH-41 2X System (unidirectional carbon fiber) both in the circumferential and longitudinal directions. The materials were designed as a standalone repair to withstand operating and transient pressures as well as gravity loads.