卡列瓜斯市水区在修复了直径66英寸的预应力混凝土圆筒管道（PCCP）的灾难性故障后，于1997年启动了其基础设施可靠性计划（IRP）。IRP包括评估现有PCCP状况的任务，以便优先考虑和修复输电系统的恶化部分。使用目视检查、声学技术和远场涡流/变压器耦合测试设备，在系统大约5英里处进行了状态评估。 对受损管道进行的法医研究表明，故障可能是外加电流阴极保护系统导致预应力钢丝氢脆的结果。管道修复被列为优先事项，并在1998年和1999年更换了78英寸和66英寸的管道。2000年冬天，该地区的修复计划得到了扩展，包括用钢板衬里对大约1100英尺（约1100英尺）的最严重受损管道进行衬里。然而，位于两个不同位置的两段20英尺的严重老化管道无法进行钢衬操作。 该区决定使用碳纤维增强复合材料将两段管道连接起来，而不是挖掘每段管道并用新的焊接钢管替换。碳纤维复合材料是一种相对较新的管道修复材料。该材料用高抗拉强度（110000 psi）碳纤维增强的环氧树脂复合材料取代了PCCP的结构部件。薄型复合材料截面（0.25英寸）直接多层应用于PCCP内部。 2000年2月，捷运局授予了一份设计/建造合同，用碳纤维增强复合材料修复两个直径78英寸的20英尺PCCP段。使用复合材料修复管段的主要原因包括:使用现有的人行通道进行修复，从而避免PCCP的开挖、支护和拆除费用；尽量减少因缺乏开挖而对公众、交通、相邻公用设施和结构造成的影响，从而无需获得进行修复的临时通行权； 快速安装复合衬里。安装碳纤维增强复合材料的设计/建造项目进展顺利，对公众的干扰很小，对邻近的公用设施或结构没有影响。修复的总成本约等于PCCP的开挖和更换成本。捷运局对PCCP评估和康复的方法，以及他们使用创新康复方法的意愿，使他们有了一个可行的PCCP康复替代方案。包括3个参考文献、表格。

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 werereplaced in 1998 and 1999. The District's rehabilitation program was expanded for the winter of 2000 to include lining approximately 1,100 feet of the most significantly damaged pipe with steel plate liners. However, two 20-foot sectionsof severely deteriorated pipe, at two different locations, were not accessible for the steel lining operation. Rather than excavate each section of pipe and replace it with a new section of welded steel pipe, the District decided to line the two sections of pipe using a carbon fiber-reinforced composite material. Carbon fiber composites are a relatively new material for pipelinerehabilitation. The material replaces the deteriorating structural components of the PCCP with a composite material of epoxy resin reinforced with high tensile strength (110,000 psi) carbon fiber. The thin composite section (0.25 inches) is directly applied to the inside of the PCCP in multiple layers. In February 2000, the District awarded a design/build contract to rehabilitate two twenty-foot sections of 78-inch diameter PCCP using carbon fiber-reinforced composite material. The primary reasons for rehabilitating the sections with the composite material included: accomplishing the repair using existing manways for access to the pipeline, thereby avoiding the expense of excavation, shoring, and demolition of the PCCP; minimizing impacts, by the lack of excavation, to the public, traffic, adjacent utilities and structures, this eliminating the need to acquire temporary right of way to conduct the repair; and, quick installatin of the composite lining. The design/build project for installing the carbon fiber-reinforced composite proceeded smoothly with little disruption to the public and no impacts to adjacent utilities or structures. The total cost for the repairs was approximately equal to the cost for excavation and replacement of the PCCP. The District's approach to PCCP assessment and rehabilitation and their willingness to use an innovative rehabilitation method resulted in their having a viable alternative for PCCP rehabilitation. Includes 3 references, tables.