On Classification and Selection for the Structures of Crossover Pipeline

The crossover structure of pipeline can be divided into two major categories on the basis of pipeline itself's stress in the structure : one is that the pipeline is taken as a stressed member in the crossover structure, which is called crossover pipeline section; the other is that the pipeline is not used as a stressed member in the crossover structure, but laid on a bridge, which is called pipeline bridge. By analyzing and studying Russian and American pipeline codes, it is pointed out that the longitudinal stress of pipeline induced from external force should be avoided if possible in the design and construction of pipeline. The stress of suspension crossover pipeline section and pipeline section suspended with diagonal rope have been analyzed and compared, and the applicable scope of the two structures has been given. Meanwhile, the paper points out that it is available to adopt the pipeline bridge to cross river for the large diameter high pressure oil pipeline.