Patent ID: 8992276
Filing Date: 2015-03-31
Classification: B63B,E21B

Abstract:
1. A drilling vessel or drilling platform comprising: a monohull with a bow and a stern and a moonpool; an accommodation topside having crew quarters and a bridge, the accommodation topside being arranged on the hull at the bow; a main deck between the accommodation topside and the stern, wherein a front main deck portion of the main deck extends forward of the moonpool and a rear main deck portion of the main deck extends rearward of the moonpool; a multiple firing line hoist system mounted on the hull above the moonpool, the multiple firing line hoist system comprising a mast having a base that extends between sections of the hull on port and starboard side of the moonpool, the base being spaced from a bow side and from a stern side of the moonpool, thereby forming a front moonpool area forward of the mast and a rear moonpool area rearward of the mast; and a hydraulic riser tensioner system configured to apply a tension force from the drilling vessel or drilling platform upon a riser string, the hydraulic riser tensioner system comprising: