输气管道工程用钢制管线法兰技术分析
Technical analysis of steel pipeline flanges for gas transmission pipeline engineering
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- 引用格式:
-
张有渝,陈学文,毛翔.输气管道工程用钢制管线法兰技术分析[J].天然气与石油,2025,43(6):50-59.doi:10.3969/j.issn.1006-5539.2025.06.007
ZHANG Youyu, CHEN Xuewen, MAO Xiang.Technical analysis of steel pipeline flanges for gas transmission pipeline engineering[J].Natural Gas and Oil,2025,43(6):50-59.doi:10.3969/j.issn.1006-5539.2025.06.007
- DOI:
- 10.3969/j.issn.1006-5539.2025.06.007
- 作者:
- 张有渝1 陈学文2 毛翔1
ZHANG Youyu1, CHEN Xuewen2, MAO Xiang1
- 作者单位:
- 1. 中国石油工程建设有限公司西南分公司, 四川 成都 610041; 2. 四川科宏石油天然气工程有限公司, 四川 成都 610051
1. CPECC Southwest Company, Chengdu, Sichuan, 610041, China; 2. Sichuan Kehong Oil and Natural Gas Engineering Co., Ltd., Chengdu, Sichuan, 610051, China
- 关键词:
- 管法兰;管线法兰;法兰设计;泰勒—华脱尔斯法;垫片密封性能;管子最小屈服强度;管子壁厚;法兰焊接端
Pipe flange; Pipeline flange; Flange design; Taylor-Waters method; Gasket sealing performance; Minimum yield strength of pipe; Pipe wall thickness; Flange welding end
- 摘要:
- 对美国输气管道、工艺管道、压力容器的设计规范中法兰设计计算方法和法兰标准规定进行对比,发现仅输气管道设计规范同时采用了管法兰标准ASME B16.5《管道法兰和法兰配件:NPS 1/2至NPS 24公制/英寸标准》(以下简称ASME
B16.5)、ASME
B16.47《大直径钢法兰:NPS
26至NPS
60公制/英寸标准》(以下简称ASME
B16.47)和管线法兰标准ANSI/MSS
SP-44 Steel pipeline flanges(以下简称ANSI/MSS SP-44)。为探究有此不同规定的原因，通过对法兰设计计算方法泰勒—华脱尔斯(Taylor—Waters)法、管法兰标准ASME B16.5、ASME B16.47和管线法兰标准ANSI/MSS SP-44编制历史回顾及ANSI/MSS SP-44对管线法兰材料、热处理、法兰设计规定等的分析,明确了管线法兰焊接端在输气管道中和与之对接的管线最小屈服强度及壁厚存在相互关联的影响,并可能影响管线法兰结构尺寸和法兰本体材料的选择,特别是当与管线法兰焊接端对接的管线为高强度、冷作及薄壁条件下,更应重视管线法兰本体材料选用和对法兰垫片密封性能的影响,这是管线法兰与管法兰不同的特点。根据中国输气管道工程管线法兰设计与选用,管线法兰标准编制现状分析,提出了修订补充输气管道工程设计规范有关管线法兰和管法兰的技术规定,编制管线法兰标准和管线法兰钢标准的建议；并对在役输气管道上不合标准的法兰,提出进行有计划更换的建议,以保证在役管线法兰密封性能,达到长期安全运行的目的。
A comparison of flange design calculation methods and flange standards specified in the design specifications for gas pipelines, process pipelines, and pressure vessels in the United States reveals that only the design specifications for gas pipelines simultaneously adopt the pipe flange standards ASME B16.5 Pipe flanges and flanged fittings: NPS 1/2 through NPS 24, Metric/lnch Standard(hereinafter referred to as ASME B16.5), ASME B16.47 Large diameter steel flanges: NPS 26 through NPS 60, Metric/inch standard(hereinafter referred to as ASME B16.47), and the pipeline flange standard ANSI/MSS SP-44 Steel pipeline flanges(hereinafter referred to as ANSI/MSS SP-44). To investigate the cause of these differences, through a brief review of the Taylor-Waters method for flange design calculation, the compilation history of pipe flange standards ASME B16.5, ASME B16.47, and pipeline flange standard ANSI/MSS SP-44, as well as an analysis of ANSI/MSS SP-44′s provisions on pipeline flange materials, heat treatment, and flange design, it is clarified that the minimum yield strength and wall thickness of pipeline flange welding ends in gas pipelines and the pipes connected to them have a mutually related impact, which may affect the structural dimensions of pipeline flanges and the selection of flange body materials. Especially when the pipes connected to the pipeline flange welding ends are high-strength, cold-worked, and thin-walled, more attention should be paid to the selection of pipeline flange body material and its impact on the sealing performance of flange gaskets. This is a distinctive feature of pipeline flanges compared to pipe flanges. Based on an analysis of the design and selection of pipeline flanges in China's gas pipeline projects, as well as the current status of pipeline flange standard compilation, suggestions are made to revise and supplement the technical provisions related to pipeline flanges and pipe flanges in the design specifications for gas pipeline engineering. These suggestions include compiling pipeline flange standards and pipeline flange steel standards and systematically replacing non-compliant flanges on in-service gas pipelines to ensure the sealing performance of in-service pipeline flanges and achieve long-term safe operation.
