规范《DLT714-2000-汽轮机叶片超声波检验技术导则》.pdfVIP

汽轮机叶片超声波检验技术导则 DL/T714-2000 DL/T 714- 2000 目 次 前言 ·······································，···········································…… 1589 1 范围···················································································· ··…… 1590 2 引用标准 ·················································································…… 1590 3 术语 ···························································································‘二1590 4 总则···················································，·····································…… 1590 5 仪器、探头和试块 ·······································‘····································…·… 1591 6 检验技术条件选择··································。·········································…·…巧引 7 检验报告····························，················。·······································…… 1594 附录A (标准的附录) 汽轮机叶片超卢检验灵敏度及动态波形 ······················… 1594 附录B (提示的附录) 国产 (125一300)MW机组汽轮机叶片、叶根配置 ······…… 1599 1589 Dl,/T714-2000 前 言 本标准是根据原电力工业部电力行业标准制、修订计划 (技综 [1996]40号)的安排 制定的 运行中汽轮机叶片处于极复杂的应力状态，往往由于叶片 (叶身和叶根)设计不合理， 材料不符合要求，机加工质量不佳，组装工艺不良，运行L况变动等因素的影响造成叶片断 裂事故。对叶片尤其是叶根进行预防性检查是消除设备隐患，确保机组安全运行的重要手 段。 长期以来，许多单位为了搞好这项工作，做了大量的试验研究。尤其目前大量老机组仍 然在超期服役，大容量新机组相继投运，叶片的断裂时有发生，本标准的制定为叶片无损检 测提供 了技术依据，同时提高了检测的准确性，尽可能避免和减少因误判而造成的不必要损 失 本标准附录A是标准的附录，附录B是提示的附录。 本标准由电力行业电站金属材料标准化技术委员会提出并归口。 本标准起草单位:国家电力公司热工研究院、西北电力试验研究院、江苏电力试验研究 所、常熟电厂、甘肃电力试验研究所、台州电厂。 本标准主要起草人:吴前驱、白小云、于强、王世华、吴凯、张明非、徐大鹰。 本标准委托电力行业电站金属材料标准化技术委员会解释 巧89 中华人民共和国电力行业标准 汽轮机叶片超声波检验技术导则 DI,/T714-2000 Technicalguidefurtheultrasonictesting ofturbine-blades 1 范围 本导则规定了火电厂在役机组检修时，使用A型脉冲反射式超声波探伤仪，以单探头 接触法为主进行汽轮机叶片 (叶身及叶根)的超声波检验和判定方法。 本导则适用于火力发电厂600MW以下汽轮机