“Two other unique features went into the CUSS 1 design. Special vertical guides welded inside the derrick served as rails along which the frame of the rig’s six-ton traveling block moved. The frame contained sheaves for the wire rope that moved up and down from the drawworks during drilling. The vertical guides kept the traveling block from swaying dangerously in response to vessel motion. In fact, from that point on, builders fitted rails for all traveling blocks on the derricks of floating MODUs. Also, engineers installed a mechanical pipe-handling system that stacked stands of tubulars (casing, drill pipe, and weighted drill collars) horizontally on deck and could raise them quickly to the vertical position in the derrick for lowering into the hole. This system achieved two things. First, it eliminated the need to rack tubulars in the derrick, a common practice on land rigs and bottom-supported MODUs, but obviously unsafe aboard a floating rig. Second, it all but eliminated the sometimes-dangerous job of derrick man. Maintenance and other non-drilling duties, however, at times still required men to work high in the derrick.”
Maersk drillships dimensions:
Length, 228 meters (748 feet)
Width overall: 42 meters (138 feet)
Water depth for operating: 3,600 meters (12000 feet)
Drilling Depth 12000 meters (40000 feet)
This hopefully shows the advancements that have been made with our vessels and indeed the view from many that as well as setting the standards with automation and safer working environments, we (Maersk Drilling) have moved forward in leaps and bounds, from the early vessels, and also some of the standard current vessels of competitors.