Rehabilitation of 78-inch PCCP with Carbon Fiber Reinforced Composite Material

Calleguas Municipal Water District initiated their Infrastructure Reliability Program (IRP) in 1997 after repairing a catastrophic failure of a 66-inch diameter prestressed concrete cylinder pipeline (PCCP). The IRP includes tasks to assess the condition of the existing PCCP in order to prioritize and rehabilitate deteriorating sections of the transmission system. Condition assessments have been conducted using visual inspections, acoustic techniques, and remote field eddy current/transformer coupling testing equipment on approximately 5 miles of the system. Forensic studies conducted on the damaged pipe indicated that the failure was probably the result of hydrogen embrittlement of the prestressing wire induced by an impressed current cathodic protection system. Pipe rehabilitation was prioritized and sections of 78-inch and 66-inch pipe were replaced in 1998 and 1999.