介绍NACE外部腐蚀直接评估（ECDA）过程——评估和减少外部腐蚀对管道完整性影响的过程。ECDA是一个持续改进的过程，其优点是定位未来可能形成缺陷的区域，而不仅仅是已经形成缺陷的区域，从而有助于防止未来的外部腐蚀损坏。本标准涵盖了ECDA的四个组成部分:预评估、间接检查、直接检查和后评估。关键词:直接评估，管道。

Covers the NACE external corrosion direct assessment (ECDA) process--a process of assessing and reducing the impact of external corrosion on pipeline integrity. ECDA is a continuous improvement process providing the advantages of locating areas where defects can form in the future, not just areas where defects have already formed, thereby helping to prevent future external corrosion damage. This standard covers the four components of ECDA: Pre-Assessment, Indirect Inspections, Direct Examinations, and Post Assessment. Key words: direct assessment, pipelines.