For the research of buried hot oil pipelines at shutdown, it was established that normal operation of buried hot oil pipelines and unsteady-state heat transfer model at shutdown with finite volume method and finite difference method. It considered that the changes of crude oil viscosity, density, specific heat and thermal coefficient with temperature in normal operation and shutdown, and considered oil latent heat of solidification impact on temperature drop at shutdown. Land surface temperature bases on periodic boundary conditions. And temperature drop of hot oil pipelines which are put into operation and has been operating until the march of the second year was simulated at shutdown. The research shows that there are many differences about oil curing at each section of pipeline and temperature field of soil obviously changes with shutdown time prolonged. Shutdown time is reasonably made sure, which provides theoretical guidance for pipe safe start.

The process of LNG rolling evolution was simulated after stratification according to control equation of the process of rolling in LNG spherical tank, based on VOF model and boussinesq. Numerical analysis of the affecting factors for the roll. Research shows that the root cause of rolling for LNG is layering. The average convection velocity increased in the tank is followed with increasing of the quantity of environment heat leakage, accelerated the roll time of LNG. LNG rolling time could be lag because of large differences density in layered area but natural convection is severe within the layer. Roll will get the evaporation rate gather in the lower then caused the pressure augment and serious harm in the tank in a moment. Finally, some suggestions to prevent rolling were given. Providing theoretical guidance for LNG safety storage and optimize operations.

Hot oil pipeline and product pipeline with the parallel in the trench for the laying was studied for energy transfer process. Application of finite difference method analyzed the pipeline during normal operation of non-steady-state heat transfer model. And using finite volume method calculated the pipeline in parallel pipelines at different sections around the soil temperature field in numerical calculation. In the west pipeline, Shanshan-sibao, for example, the surface temperature with periodic boundary conditions, and obtained the discipline in different seasons at different locations along the soil temperature field. Research shows that with the cyclical changes of surface temperature, the impact of cold product pipeline to the soil temperature field around hot oil pipeline is different. And the impact on soil temperature field around the side of hot oil pipeline far away from the cold product pipeline is little. With the run-time increasing of pipeline, the impact of cold product pipeline to the soil temperature field surrounding the hot oil pipeline gradually weakened. Simulation results show that it is consistent with the practice. It provides theoretical guidance for the developing maintenance plans and intermittent delivery programs and determining safe shutdown time.