天然气管道内腐蚀的原理及直接评价

Principle and Direct Assessment of Internal Corrosion of Gas Pipelines

内腐蚀是H2S,CO2等酸性气体和水汽对管道内壁造成的腐蚀,常见于天然气管道埋深,管径等条件发生改变处。目前对内腐蚀的防护主要通过管道内涂层和添加缓蚀剂实现。通过内腐蚀的直接评价技术(DG-ICDA)可有效对管道做出内腐蚀评价。近年来内腐蚀受到重视的程度提高,未来对内腐蚀的研究方向主要为新材料、新的输送工艺、气体质量等,同时继续完善内腐蚀的评价技术等相关理论。

Internal corrosion is a kind of corrosion caused by H2 S, CO2 and other acidic gases and water vapor on the pipe wall. Internal corrosion usually occurs in the place where natural gas pipeline is buried deeply and the diameter condition changs. At peesent, the main protection method of internal corrosion is internal coating with inhibitor. In addition, internal corrosion direct assessment techniques （DG-ICDA） can effectively evaluate the pipeline corrosion. In recent years, internal corrosion attracts more attention. In the future, the main directions of study of internal corrosion are new materials, new transportation technology and gas quality. And continuing to improve the corrosion evaluation techniques and theories are also needed.