| 摘要 |
In the laying and recovery of underwater pipelines from and to a surface vessel having a reel from and onto which relatively inflexible pipe is unspooled and spooled, the thrust imparted to the vessel by the vessel motive force and the dynamic braking force imparted to the reel by a reel drive mechanism are co-ordinated to maintain sufficient tension in the pipeline to hold the pipeline in a desired profile, this coordination for the aforesaid purpose embracing both the stoppage of the forward motion of the vessel to maintain a station keeping mode to enable any necessary operations to be carried out on the pipe, and the subsequent resumption of the forward motion of the vessel. |
