| 摘要 |
<p>A method for laying a pipeline (1) on the sea bed from a lay barge (10) in order to achieve controlled thermal expansion, comprises the following steps: Feeding out of the pipeline (1) having a radius of initial residual curvature (RrInit) from a pipeline reel (2), preferably via a stinger (3) to a curvature means (4) where a radius of reversal curvature (Rmk) is applied to the opposite side of the pipeline with respect to the radius of initial residual curvature (RrInit) when the pipelines is passing through the curvature means (4). The curvature means (4) straightens out the pipeline to longer, mainly straight portions (L) with length (LL) having a radius of residual curvature (Rr) which is larger than a desired minimum radius of residual curvature (RrMin). The curvature means (4) exposes shorter portions of the pipeline (1) with a length (lE) for a radius of counter curvature (RmkE) forming the thermal expansion loops (E) having a radius of residual curvature (RE) which is less than a desired maximum radius of residual curvature (REMax) for the thermal expansion loops (E). The result is controlled pipe deflection under thermal expansion of the pipeline (1) in operational position on the seabed and under operational loads, in that the deflection of the pipeline (1) may appear in the thermal expansion loops (E) of the pipeline.</p> |
