双金属复合管标准发展现状及存在的问题

针对目前双金属复合管产品及相关检验试验标准研究方面的不足,介绍了国内外双金属复合管相关标准的发展历程及现行标准的制修订情况,对比分析了国内外双金属复合管标准的主要条款。结果表明:目前国外双金属复合管标准主要以API SPEC 5LD《内覆或衬里耐腐蚀合金复合钢管规范》系列标准为主,其经过4次修订而成;中国双金属复合管标准以API SPEC 5LD为基础,通过等同采用和修改采用,升级为第3版的SY/T 6623—2018《内覆或衬里耐腐蚀合金复合钢管规范》;国内外双金属复合管标准存在对机械复合管塌陷试验、紧密度试验、弯曲试验指标的规定不明确,冶金和机械复合管工厂焊接及施工焊接工艺评定项目未规范等问题。未来,双金属复合管标准尚需结合制造、检验、工程应用等技术需求来进行完善。

Development status and existing problems of standards for bimetal composite pipe

Regarding the deficiencies in the research of bimetal composite pipe products and related inspection and test standards,the development history of related standards for bimetal composite pipes at home and abroad as well as the establishment and revision of the current standards was introduced,and the main clauses of the standards for bimetal composite pipes at home and abroad were compared and analyzed.The results show that the current foreign standards for bimetal composite pipes are mainly Specification for CRA clad or lined steel pipe(API SPEC 5LD)series standards,which have been revised for 4 times.In China,based on API SPEC 5LD,the standard for bimetal composite pipes has been upgraded to Specification for CRA clad or lined steel pipe(SY/T 6623-2018)(3rd edition)by means of equivalent adoption and modified adoption.No matter at home or abroad,there are still problems in the standards of bimetal composite pipe,such as unclear specifications on collapse test,tightness test and bending test indexes of lined pipes,and the unspecified procedure qualification items for factories or construction welding of clad and lined pipes.In the future,the standards for bimetal composite pipes still need to be improved in combination with technical requirements such as manufacturing,inspection and engineering application.