天然气管线全焊接锻造球阀最大弯曲载荷研究

发布时间：2018-01-15 00:14

本文关键词：天然气管线全焊接锻造球阀最大弯曲载荷研究　出处：《应用基础与工程科学学报》2017年04期 　论文类型：期刊论文

【摘要】：为保证天然气长输管线全焊接锻造球阀在地基沉降、山体滑坡等实际可能工况下有足够强度和良好密封性能,基于有力矩理论和弯曲应力理论,从强度和密封角度对全焊接锻造球阀可承受最大弯曲载荷进行理论分析计算和数值模拟实验,得到全焊接锻造球阀同时满足强度与密封性能的最大弯曲载荷;通过分析理论载荷值与临界载荷值得到修正系数C,求出全焊接锻造球阀在任意公称压力和直径下可承受最大弯曲载荷.研究表明:在保证强度有效的最大弯曲载荷下,球阀密封性能依然有效;修正系数的引入弥补了理论计算无法考虑结构突变、应力集中、几何非线性等因素引起的不足;研究方法弥补了国内无法进行全焊接锻造球阀抗弯性能评估型式试验的不足.
[Abstract]:In order to ensure that the fully welded forged ball valve of long distance natural gas pipeline has sufficient strength and good sealing performance under the actual working conditions such as foundation settlement and landslide, the theory of moment and bending stress is based on. From the angle of strength and seal, the maximum bending load of fully welded forged ball valve can be obtained by theoretical analysis and numerical simulation, and the maximum bending load of fully welded forged ball valve can meet both strength and sealing performance. By analyzing the theoretical load value and the critical load value to the correction coefficient C. The maximum bending load of the fully welded forged ball valve under any nominal pressure and diameter is obtained. The results show that the sealing performance of the ball valve is still effective under the maximum bending load which ensures the effective strength of the ball valve. The introduction of the correction coefficient makes up for the deficiency caused by the failure of theoretical calculation to consider structural catastrophe, stress concentration, geometric nonlinearity and so on. The research method makes up for the shortage of domestic type test for evaluating the bending resistance of fully welded forging ball valve.
【作者单位】：兰州理工大学石油化工学院;机械工业泵及特殊阀门工程研究中心;山东益都阀门集团股份有限公司;
【基金】：国家自然科学基金项目(51569012) 中国石油天然气股份公司重大科技专项(2012E-2802) 甘肃省高校基本业务费资助项目(20146302)
【分类号】：TE973.3
【正文快照】： 管线输送作为石油天然气主要运输方式,需长期连续运行,且除要求承受内部介质压力外,还需承受可能由于地基沉降、山体滑坡、洪水、地震等外部因素引起的外部载荷,这些因素对管线的寿命、密封性能等提出了更为严格的要求.具有高强度、高密封性、防火、防静电等优点的全焊接锻造

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