输水钢管壁厚设计与腐蚀防护.pdf

　 2015年 2015　 　 第3期 Pipeline　 Technique　 and　 Equipment No．3　 输水钢管壁厚设计与腐蚀防护 李彦君,黄明珠 (佛山市水业集团有限公司,广东佛山　 528000) 　 　 摘要:通过对一定壁厚输水钢管的强度、刚度与稳定性计算分析,阐释了正常敷设条件与荷载下, 目前输水钢管壁厚设计存在较多裕量,从腐蚀防护的角度分析了该裕量是为了应对防腐层失效后环境 对管壁的腐蚀,得出通过科学设计、合理选择防腐方式并严控防腐质量等措施,可以使管道壁厚适当减 薄,可以节省工程投资的结论。 关键词:钢管;壁厚;结构安全;防腐质量 - - - 中图分类号:TU991　 　 　 文献标识码:A　 　 　 文章编号:1004 9614(2015)03 0013 03 Water-supply Steel Pipe Thickness Designing and Corrosion Protection LI Yan-jun,HUANG Ming-zhu (Foshan Water Group,Foshan 528000,China) Abstract:Through the calculation and analysis of the strength,rigidity and stability of water-supply steel pipe with certain thickness,the steel pipe thickness designing exists margin in the situation of normal installation conditions and load was ex- plained. Also fromtheperspectiveof corrosionprotection,that themargin istoprevent environment corrosion after erosionresist- ant coating failswas analyzed. The conclusion that through scientific design,reasonably choice of anti-corrosion way and strictly controlsof anti-corrosin,thepipewallthicknesscanbethinappropriately andtheengineeringinvestment canbe savedeffectively was drawed. Key words:steel pipe;pipe thickness;structural safety;anti-corrosion quality 1　 钢管的结构安全性分析 t为8 mm,计算壁厚t 采用6 mm(按照《规程》要求, 0 以DN800钢管为例,非特殊条件或运行工况要求 富余构造壁厚 2 mm),设计内水压力按试验压力取 下,壁厚一般选择 10 mm。 按照CECS141:2002《给水 0．9 MPa;覆土厚度分1．2 m和2 m两种情况,车辆荷