For the crossing section design of the pipe-in-pipe systems, it is necessary to consider the stress-strain initiated by crossing configuration and check the vertical stability of the crossing section.

双层海底管道的跨越设计既需要考虑跨越构形引发的应力应变，也需要充分校核管道跨越段的垂向稳定性。

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For the crossing section design of the pipe-in-pipe systems, it is necessary to consider the stress-strain initiated by crossing configuration and check the vertical stability of the crossing section.

双层海底管道的跨越设计既需要考虑跨越构形引发的应力应变，也需要充分校核管道跨越段的垂向稳定性。

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