现行设计系数对中俄东线OD 1422mm管道的适用性  

Applicability of current design coefficient to OD 1422mm pipelines in China-Russia East Natural Gas Pipeline

作　　者：张振永[1] 周亚薇[1] 张金源[1] ZHANG Zhenyong ZHOU Yawei ZHANG Jinyuan(China Petroleum Pipeline Engineering Corporatio)

机构地区：[1]中国石油天然气管道工程有限公司

出　　处：《油气储运》2017年第3期319-324,共6页Oil & Gas Storage and Transportation

基　　金：中国石油天然气股份公司"十二.五"重大科技专项"第三代大输量天然气管道关键技术研究";2012E-2801-01

摘　　要：中俄东线天然气管道工程是大口径(OD 1 422 mm)、高压力输气管道,涉及新工艺、新管材的应用,按照目前我国管道设计标准规定的设计系数确定的管道壁厚能否保证管道安全运行,是其设计过程中的技术难题之一。利用我国天然气管道可靠性设计与评价技术研究成果,结合中俄东线OD 1 422 mm管道途经地区等级、管材性能、建设及运行维护参数,依据现行设计系数计算得到中俄东线天然气管道工程的3种管道壁厚分别为21.4 mm、25.7 mm、30.8 mm。基于可靠性方法对管道失效概率进行计算分析,得到极端极限状态下管道失效概率分别为1.27×10^(-7)次/(km·a)、3.66×10^(-10)次/(km·a)、3.53×10^(-15)次/(km·a),均满足中俄东线天然气管道目标可靠度要求,表明按现有设计系数计算得到的管道壁厚对OD 1 422 mm管道设计是适用的,能够保障管道建成后安全平稳运行。In China-Russia East Natural Gas Pipeline engineering, large-diameter（OD 1 422 mm） high pressure gas transportation pipeline are used and new technologies and materials are involved. One of the technical problems related to this pipeline engineering is whether the pipe wall thicknesses determined by the design coefficient stipulated in China＇s pipeline design standards can ensure the pipeline safety during its operation. By virtue of the research achievements of China＇s natural gas pipeline reliability design and assessment technologies, three wall thicknesses（i.e., 21.4 mm, 25.7 mm and 30.8 mm） were obtained in the pipeline engineering based on the current design coefficient in combination with the regional levels, pipe properties and construction, operation and maintenance parameters of OD 1 422 mm pipes in this engineering. Then, failure probability of pipelines was calculated and analyzed by the reliability method. The failure probabilities of pipelines in ultimate limit state are 1.27×10^-7/（km·a）, 3.66×10^-10/（km·a） and 3.53×10^-15/（km·a）, respectively, and they all satisfy the reliability targets of China-Russia East Natural Gas Pipeline. It is indicated that the pipe wall thickness derived from the current design coefficient is applicable to the design of OD 1 422 mm pipelines, and it can guarantee the safe and smooth operation of the pipeline after it is built up.

关 键 词：中俄东线天然气管道 OD 1422mm 设计系数 壁厚 失效概率 可靠度 

分 类 号：TE88[石油与天然气工程—油气储运工程]