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发表于 2014-4-11 10:06
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来自: 中国福建福州
三冲程柴油机 发表于 2014-4-2 21:12
不能用再I II级管 套管 规范的出处是? 什么规范
LR规范5-12-2-8
2.8 套管焊接接头
2.8.1 套管焊接接头可用于3级系统任何外径的碳钢管。套管焊接附件应为锻钢件,其材料应与所连接的管子材料一致。在特殊情况下,套管焊接接头可用于外径不大于88.9mm的Ⅰ级和Ⅱ级管系。这种接头不应用于有可能产生疲劳、严重浸蚀或裂缝腐蚀的地方,或者传送易燃性有毒介质的地方。另见第10章14.4.9。
2.8 Socket weld joints 2.8.1. Socket weld joints may be used in Class III systems with carbon steel pipes of any outside diameter. Socket weld fittings are to be of forged steel and the material is to be compatible with the associated piping. In particular cases, socket welded joints may be permitted for piping systems of Class I and II having outside diameter not exceeding 88,9 mm. Such joints are not to be used where fatigue, severe erosion or crevice corrosion is expected to occur or where toxic media are conveyed. See also Ch 10,14.4.9.
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