关键词: 输油管道 , 　管架 , 　热应力 , 　补偿器

Abstract: According to changing the type of oil in the process of transportation by the above ground pipeline, which may cause the pipe rack bending and thermal stress damage. The thermal expansion and thermal thrust of the compensator which has an important effect on the pipe rack bending were analyzed. Thereby, the axial horizontal displacement and horizontal thrust were determined. Clear and definite the reason for pipe rack bending. Combined with the type of medium transport in the pipe, the medium temperature, the pipe model, the pipe arrangement craft and other factors, the thermal stress of pipe and the allowable stress range were determined, To judged whether the pipe will produce destructive thermal stress and by the experience formula for further confirmation.

Key words: Oil pipeline , Pipe rack ,  Thermal stress , Compensator