【摘要】：采用管道單一強度設計系數(shù)方法無法科學地反映管材性能、管道施工和管道運行維護水平。為了克服上述方法的不足并評估和改進現(xiàn)行《輸氣管道工程設計規(guī)范》(GB 50251—2015)中規(guī)定的天然氣管道強度設計系數(shù),采用基于可靠性的天然氣管道設計方法,針對國內(nèi)近4×10~4 km已建天然氣管道,根據(jù)管道壓力、管徑、管材鋼級等劃分了258種計算工況;在滿足天然氣管道目標可靠度的前提下,應用國內(nèi)的管材、焊接情況、腐蝕情況和運行維護情況等統(tǒng)計數(shù)據(jù),經(jīng)過大量迭代計算得到了天然氣管道的臨界壁厚,并反推得到了不同工況下的天然氣管道等效設計系數(shù)。研究結(jié)果表明:①從一級地區(qū)到四級地區(qū),由可靠性方法反推得到的天然氣管道強度設計系數(shù)均隨管道管徑的增大而逐漸增大;②小管徑工況的天然氣管道強度設計系數(shù)一般小于國家標準規(guī)定值;③大管徑工況的天然氣管道強度設計系數(shù)則大于國家標準規(guī)定值。進而分別對不同地區(qū)等級的小管徑管道(管徑不大于508 mm)、中等管徑管道(管徑介于508~711 mm)和大管徑管道(管徑介于711~1 219 mm)的強度設計系數(shù)進行了細化和調(diào)整,增強了其合理性。
[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.
【作者單位】： 中國石油天然氣管道工程有限公司;
【基金】：中國石油天然氣股份有限公司“十二五”重大科技專項“第三代大輸量天然氣管道關鍵技術研究”(編號:2012E-2801-01)
【分類號】：TE973.1

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