火力发电厂高温高压蒸汽管道蠕变监督规程

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1、DL/T441—2004ICS27.100F23备案号：13615–2004中华人民共和国电力行业标准DL/T441—2004代替DL441—1991火力发电厂高温高压蒸汽管道蠕变监督规程Supervisioncodeforcreepstrainofsteampipeinhightemperatureandhighpressureinfossilfuelpowerplant2004-03-09发布2004-06-01实施中华人民共和国国家发展和改革委员会发布IDL/T441—2004目次前言····················

2、··············································································································································Ⅱ1范围··························································································································

3、····································12规范性引用文件··········································································································································13蠕变测量截面的设计、装设位置及保护··································································

4、··································14蠕变测量方法··············································································································································15蠕变测点和测量标记的装设······································································

5、·················································26蠕变测量和计算··········································································································································37蠕变监督的技术管理·····························································

6、······································································6附录A（资料性附录）常用蒸汽管道钢材的线性膨胀系数······································································7IIDL/T441—2004前言本标准是根据原国家经济贸易委员会司（局）《关于下达2000年度电力行业标准制、修订计划项目的安排》电力［2000］70号文，对DL441—1991进行修订。高温蒸汽管道蠕

7、变监督的目的是保证管道的安全运行。通过对管道定期、定型蠕变测量和数据分析，及时掌握高温蒸汽管道金属的蠕变规律，为正确分析和预测管道的剩余寿命提供可靠的技术依据。DL441—1991自颁布实施至今已10年有余，在实施的过程中积累了丰富的经验，也提出了一些新的问题，同时，在新修订的DL438—2000《火力发电厂金属技术监督规程》中列入了对蒸汽管道监察弯管的蠕变监督，也需要对相关内容进行修订。本标准与DL441—1991相比，主要有以下一些变化：——将原“导则”改为“规程”；——本标准改为推荐性行业标准；——增加了规范性引用文件；——

8、增加了蒸汽管道监察弯管蠕变监督的内容；——增加了附录A“常用蒸汽管道钢材的线膨胀系数”；——对原“导则”的编排顺序、体例及有关条款作了较大幅度的修订。本标准实施后代替DL441—1991。本标准附录A是资料性附录。本标准由中国电力企业联合会提出。本