Determination of oil and gas pipeline design coefficient based on experience was conservative in the previous strength design. Most studies at home and abroad demonstrated the feasibility of improving oil and gas pipeline design coefficient in theory, but it didn't give calculation method of design coefficient based on reliability. In this paper, stresssirength interference theory was introduced to the research on design coefficient of oil and gas pipeline. Taking the West to East Gas Pipeline Project and its second project for example, the reliability of pipeline without defect or with volume defect was calculated quantitatively under design coefficient of 0. 72 and 0. 8, practical measures were proposed, and the theories were provided to reduce the oil and gas pipeline wall thickness increase the transportation pressure and save the pipeline cost.%以往的油气管道强度设计中,设计系数的确定常常以经验为依据,比较保守.国内外大多数研究均是从理论上论证了提高油气管道设计系数的可行性,并没有给出基于可靠性的设计系数的计算方法.将应力-强度干涉理论引入油气管道设计系数的研究中,以西气东输一线及二线为例,定量计算了0.72和0.8两种设计系数下无缺陷管道和含体积型缺陷管道的可靠度,并提出了切实可行的措施,为油气管道降低壁厚,提高输送压力,节约管道成本提供了理论支持.
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