Method and device for constructing a pipeline with an in-line or add-on device from a pipeline laying vessel

摘要

The invention relates to a method and device for constructing a pipeline with an in-line or add-on device from a pipeline laying vessel, the method comprising the steps of: (a) suspending the pipeline from a clamping device on the vessel; (b) connecting an in-line or add-on device to the pipeline above the clamping device; (c) moving at least part of the clamping device away from the pipeline to provide clearance at the pipeline; (d) lowering the pipeline by a pipeline, deployment device until the in-line or add-on device has moved beyond the clamping device.