A method for reel-laying pipelines from a vessel includes reel laying a first pipeline by unwinding a first reel, and guiding the pipeline via a guide wheel through a tensioners and a hang off clamp into the sea; closing the hang off clamp to support the first pipeline; connecting an end portion of the first pipeline to a retaining system; replacing the first reel by a second reel; providing a temporary connection between an end portion of the second pipeline and the end portion of the first pipeline; disconnecting the first pipeline from the retaining system; opening the hang off clamp; continuing reel laying by unwinding the second reel; closing the hang off clamp; removing the temporary connection between the first and second pipeline; and connecting the first and second pipeline end to end between the tensioners and the hang off clamp.