预应力混凝土压力管（CPP）在加拿大各地广泛使用 和美国，共有约19000英里（30000公里）的管道在使用 在北美主要的供水设施中。其中许多线路超过50条 年，其中一半预计在未来20年内需要维修或更换 年。有选择地维护这些管线，避免灾难性管道造成的成本 故障、公共设施需要一种高度敏感的检测技术， 可靠、有效、经济。创新的电磁技术， 基于远场涡流（RFEC）检测技术 开发了一种允许对预应力CPP进行非侵入式检查的系统。满刻度 在嵌入式圆筒管和棒材上进行的测试- 缠绕管道 证明了新的RFEC技术对单个和多个 预应力钢丝断裂。包括6个参考文献、图表。

Prestressed concrete pressure pipe (CPP) is in widespread use throughout Canada and the United States, with a total of some 19,000 mi (30,000 km) of pipe in use in North America's major water utilities. Many of these lines are more than 50 years old, and half are expected to need repair or replacement over the next 20 years. To selectively maintain these lines and avoid costs from catastrophic pipe failures, utilities needed an inspection technique that was highly sensitive, reliable, effective, and economical. An innovative electromagnetic technique, based on the remote field eddy current (RFEC) inspection technique, has been developed that allows nonintrusive inspection of prestressed CPP. Full-scale testing conducted on embedded cylinder pipes and bar-wrapped pipelines demonstrated the new RFEC technique's sensitivity to both single and multiple breaks in prestressing wire. Includes 6 references, figures.