国内天然气管道强度设计系数的评估研究
发布时间：2019-04-01 16:31
【摘要】：采用管道单一强度设计系数方法无法科学地反映管材性能、管道施工和管道运行维护水平。为了克服上述方法的不足并评估和改进现行《输气管道工程设计规范》(GB 50251—2015)中规定的天然气管道强度设计系数,采用基于可靠性的天然气管道设计方法,针对国内近4×10~4 km已建天然气管道,根据管道压力、管径、管材钢级等划分了258种计算工况;在满足天然气管道目标可靠度的前提下,应用国内的管材、焊接情况、腐蚀情况和运行维护情况等统计数据,经过大量迭代计算得到了天然气管道的临界壁厚,并反推得到了不同工况下的天然气管道等效设计系数。研究结果表明:①从一级地区到四级地区,由可靠性方法反推得到的天然气管道强度设计系数均随管道管径的增大而逐渐增大;②小管径工况的天然气管道强度设计系数一般小于国家标准规定值;③大管径工况的天然气管道强度设计系数则大于国家标准规定值。进而分别对不同地区等级的小管径管道(管径不大于508 mm)、中等管径管道(管径介于508~711 mm)和大管径管道(管径介于711~1 219 mm)的强度设计系数进行了细化和调整,增强了其合理性。
[Abstract]:The single strength design coefficient method can not reflect the pipe performance, pipeline construction and pipeline operation and maintenance level scientifically. In order to overcome the shortcomings of the above-mentioned methods and to evaluate and improve the strength design coefficient of natural gas pipelines specified in the current Gas Pipeline Engineering Design Code (GB 502512015), the reliability-based design method of natural gas pipelines is adopted. According to the pipeline pressure, pipe diameter, pipe steel grade and so on, 258 kinds of calculation conditions have been divided according to the natural gas pipeline which has been built at 4 脳 10 脳 10 ~ 4 km in our country. On the premise of satisfying the target reliability of natural gas pipeline, the critical wall thickness of natural gas pipeline is obtained by a large number of iterative calculations using domestic statistical data such as pipe, welding, corrosion and operation and maintenance. The equivalent design coefficients of natural gas pipelines under different working conditions are obtained. The results show that: (1) from the first-class area to the fourth-grade area, the strength design coefficient of natural gas pipeline obtained by reliability method is gradually increased with the increase of pipeline diameter; (2) the strength design coefficient of natural gas pipeline under small diameter condition is generally lower than that of national standard, and the strength design coefficient of natural gas pipeline under large diameter condition is larger than that of national standard. Then, the strength design coefficients of small diameter pipe (diameter no more than 508mm), medium diameter pipe (diameter of 508x711 mm) and large diameter pipe (pipe diameter of 711 mm), 1,219 mm) of different regional grade were refined and adjusted, respectively, and the strength design coefficients of small diameter pipe (diameter no more than 508x711 mm) and large diameter pipe (pipe diameter of 711 mm) were refined and adjusted. The rationality is enhanced.
【作者单位】： 中国石油天然气管道工程有限公司;
【基金】：中国石油天然气股份有限公司“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”(编号:2012E-2801-01)
【分类号】：TE973.1
本文编号：2451699
[Abstract]:The single strength design coefficient method can not reflect the pipe performance, pipeline construction and pipeline operation and maintenance level scientifically. In order to overcome the shortcomings of the above-mentioned methods and to evaluate and improve the strength design coefficient of natural gas pipelines specified in the current Gas Pipeline Engineering Design Code (GB 502512015), the reliability-based design method of natural gas pipelines is adopted. According to the pipeline pressure, pipe diameter, pipe steel grade and so on, 258 kinds of calculation conditions have been divided according to the natural gas pipeline which has been built at 4 脳 10 脳 10 ~ 4 km in our country. On the premise of satisfying the target reliability of natural gas pipeline, the critical wall thickness of natural gas pipeline is obtained by a large number of iterative calculations using domestic statistical data such as pipe, welding, corrosion and operation and maintenance. The equivalent design coefficients of natural gas pipelines under different working conditions are obtained. The results show that: (1) from the first-class area to the fourth-grade area, the strength design coefficient of natural gas pipeline obtained by reliability method is gradually increased with the increase of pipeline diameter; (2) the strength design coefficient of natural gas pipeline under small diameter condition is generally lower than that of national standard, and the strength design coefficient of natural gas pipeline under large diameter condition is larger than that of national standard. Then, the strength design coefficients of small diameter pipe (diameter no more than 508mm), medium diameter pipe (diameter of 508x711 mm) and large diameter pipe (pipe diameter of 711 mm), 1,219 mm) of different regional grade were refined and adjusted, respectively, and the strength design coefficients of small diameter pipe (diameter no more than 508x711 mm) and large diameter pipe (pipe diameter of 711 mm) were refined and adjusted. The rationality is enhanced.
【作者单位】： 中国石油天然气管道工程有限公司;
【基金】：中国石油天然气股份有限公司“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”(编号:2012E-2801-01)
【分类号】：TE973.1
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