...水管道检测方法有三类：实地勘测（Field Reconnaissance）、管道内检测(Internal Inspection)和管道外检测(External Inspection)，在实际检测过程中，可以根据现场条件选择相应的检测技术。
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电流梯度法是一种地下管道外防护层检测的新技术。
Electric current gradient process was a new technique for testing the external coatings of the underground pipelines.
论述了城镇埋地燃气管道外防腐层的综合检测方法与分级评价方法。
The comprehensive detection method and the classification evaluation method for external anticorrosion coating of municipal buried gas pipeline are discussed.
这是国内首次在城市高压燃气管道上完成的最全面的管道外腐蚀检测与安全评定及风险评估工作。
This application case is the first complete inspection of external corrosion protection, safety assessment and risk assessment for the city gas underground pressure pipeline case in China.
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