INNOVATION
Aft mating wires guiding the Black Marlin into position.
For the CPOC installation, two combined mooring systems were used: anchor moorings and mating moorings. The anchor moorings were used to hold the Black Marlin in the stand-off position, while waiting favorable weather conditions, and the mating moorings were used to maneuver the Black Marlin (including the MDPP deck) into the desired position and keep her in position during the float-over operation. Dockwise Introduces a new Innovation In a typical float-over, the aft mating moorings must be disconnected and reconnected once they cross, converting them from transverse lines that control stern motions to longitudinal lines that balance the forward mating lines. Dockwise engineers realized this was an inadequate design, so they created a crossline catcher (CLC) - integrated into the stern entry guide (SEG), which effectively removed the need for disconnection and reconnection by guiding the lines toward the rollers. By removing the disconnect/reconnect step, mating wires remained connected, which simplified and smoothed the entire positioning operation. The CLCs were designed to handle all of the components passing through it - the stretcher,
steel wire, and joining shackle - as well as the forces of the vessel’s motions. By integrating the CLC with the SEG, a one-piece structure was created, which saved precious deckspace and kept the lines safely away from personnel. This was the first time such a device was implemented in a float-over operation! Smooth Mating Operations Once the Black Marlin arrived at the mating position, Dockwise used advanced systems to ballast the vessel and so lower the topside atop the jacket legs. The eight DockwiseOKI designed LMU’s (Leg Mating Units) and DSU’s transferred the load gradually from the vessel onto the MDPP Jacket. By absorbing the impact loads caused by vessel movements onto the topside and jacket and by guiding the stabbing cone into the receptor pieces, the topside was perfectly installed and aligned onto the legs. The successful execution of the transport and float-over installation of CPOC’s MDPP processing platform is a major milestone, further securing Dockwise’s industry position as a competitive force in the realm of fullscope marine projects.
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