In order to ensure reliability and safety of the pipeline layout and flange connection,stress analysis of the high-temperature pipeline is important and essential.In this work,CAESAR Ⅱ software was used to check the primary stress and secondary stress of the high-temperature and hot-oil pipeline in crude distillation unit.The key data such as thermal displacement,restraint force and moment of each node were analyzed.The L-shaped and Z-shaped natural compensation schemes were considered,and the pipeline layout was reasonably deployed.Also,the support&hanger design was optimized.Kellogg equivalent pressure method was used to check the reliability of the flange connection between the pipeline and nozzles of the hot-oil pump and the atmospheric tower.These efforts finally ensured the safe and long-term operation of the hot-oil pipeline.
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