ICS 25.160.40 CCS J 33 DL 中华人民共和国 电力行业标准 DL/T 820.4 —2020 DL/T 820.4—201X 代替 DL/T 820 —2016 管道焊接接头超声波检测技术规程 第4部分：在役检测 Code of ultrasonic testing technique for butt welds of pipes — Part 4：In-service testing 2020 - 10 - 23发布 2021 - 02 - 01实施 国家能源局 发布 DL/T 820.4 —201X I 目 次 前 言 ................................ ................................ ................................ ................................ ................................ .. II 1 范围 ................................ ................................ ................................ ................................ ................................ .. 1 2 规范性引 用文件 ................................ ................................ ................................ ................................ .............. 1 3 术语 ................................ ................................ ................................ ................................ ................................ .. 1 4 总则 ................................ ................................ ................................ ................................ ................................ .. 3 4.1 一般规定 ................................ ................................ ................................ ................................ ............... 3 4.2 检测方法选用原则 ................................ ................................ ................................ ............................... 4 4.3 缺陷分类及判定 ................................ ................................ ................................ ................................ ... 4 5 检测仿真 ................................ ................................ ................................ ................................ .......................... 4 5.1 仿真软件功能要求 ................................ ................................ ................................ ............................... 4 5.2 结果验证与使用 ................................ ................................ ................................ ................................ ... 5 6 缺陷定性和定量 ................................ ................................ ................................ ................................ .............. 5 6.1 PE缺陷定性 ................................ ................................ ................................ ................................ ........... 5 6.2 TOFD缺陷定性 ................................ ................................ ................................ ................................ ...... 6 6.3 PA（TFM）缺陷定性 ................................ ................................ ................................ ............................. 7 6.4缺陷定量 ................................ ................................ ................................ ................................ ................ 7 7 缺陷跟踪 ................................ ................................ ................................ ................................ .......................... 7 7.1 跟踪对象 ................................ ................................ ................................ ................................ ............... 7 7.2 TOFD缺陷跟踪 ................................ ................................ ................................ ................................ ...... 7 8 缺陷评定 ................................ ................................ ................................ ................................ .......................... 7 9 记录和报告 ................................ ................................ ................................ ................................ ...................... 7 附录 A（资料性附录） PA（TFM）相控阵超声实时全聚焦检测方法 ................................ ............................ 9 附录 B（规范性附录）小直径管异种钢及奥氏体钢对接接头相控阵超声检测 ................................ ......... 12 附录 C（资料性附录）管件焊接接头相控阵超声检测 ......................