| 摘要 |
Pipeline comprises an inner pipe (10, 10', 10'') fixedly secured to an outer pipe (12, 12'), the arrangement being such that, when the temperatures of the inner and the outer pipes are the same, the inner pipe (10, 10', 10'') is in a state of longitudinal tension and the outer pipe (12, 12') is in a state of longitudianl compression. A method and apparatus for forming the pipeline are also described. |
