文献类型：期刊文献

英文题名：Fracture failure research on feculence discharge pipe of LPG spherical tanks

作者：Wang, Chen[1]; Chen, Jin[1]; Cai, XiaoHui[1]; Wang, YinPei[1]

机构：[1] Key Lab. of Safety Science of Pressurized System, Ministry of Education, School of Mechanical Engineering, East China University of Science and Technology, Shanghai, 200237, China

年份：2014

卷号：6A

外文期刊名：American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP

收录：EI(收录号：20144800264368)

语种：英文

外文关键词：Sulfur compounds - Spheres - Brittle fracture - Liquefied petroleum gas - Scanning electron microscopy - Tanks (containers) - Residual stresses - Chemical analysis - Fracture testing - Cracks - Spectroscopy - Spectrum analysis - Stress analysis

摘要：The rupturing of feculence discharge pipe happened during the gas-tightness test of LPG (Liquefied petroleum gas) spherical tanks. In order to find out the reasons of fracture failure of feculence discharge pipe, the Scanning electron microscopy (SEM) analysis, mechanical property testing, metallographic examination and energy spectrum analysis of corrosion products were used. The examination results show that both chemical composition and metallographic structure are normal, and the cracking is the brittle cleavage fracture. The energy spectrum analysis of corrosion products reveals that there are many sulfides in the corrosion products. Based on the loading conditions of spherical tanks, crack morphology and corrosion products, the primary reason of pipe cracking is stress corrosion cracking induced by H2S existed in liquefied petroleum gas. So it is suggested that the examination should be fulfilled for the feculence discharge pipe of such spherical tanks, the cracked pipes should be replaced, and the welding residual stress in the pipes should be relieved before replacing operation. Copyright ? 2014 by ASME.