Abstract: A monohull offshore vessel includes a hull having a moonpool and a pipe storage. A multipurpose tower is mounted on the hull at the moonpool, and a pipe handling system is provided for handling pipes to be used with the multipurpose tower. The pipe handling system includes a gantry beam provided at opposite ends thereof with guides for interacting with horizontal guide tracks extending along opposite sides of the pipe storage for movement along the pipe storage. The guides supporting the gantry beam extend beyond the pipe storage, such that the pipe handling system can cover parts of the vessel other than the pipe storage to transport pipes and/or other objects.