There are a few different technologies that have been used in floatover installations. Safety, economics andrnreliability are still the primary challenges for offshore installation. The technology used for the Malampayarn11,500MT and the Wandoo 6,500MT integrated decks is proven, and has successfully fulfilled thesernchallenges. This paper describes the techniques used in the successfully mating of large integrated decksrnonto fixed substructures in open (unsheltered) waters.rnThe method described utilizes a single barge to carry an integrated deck. Docking/undocking mooring andrntow tugs are used to maneuver the installation barge into installation position. Moorings and fenders arernused for keeping an installation barge in an accurate position. Elastic pads in both the Deck Support Unitsrn(DSU) and the Leg Mating Units (LMU) are used to reduce dynamic impact load during the offshorerninstallation. Ballast system is used to ballast down installation barge and lower down the integrated deck onrnto pre-installed sub-structure. Sand jacks are the mechanism for lowering the integrated deck into final in -rnplace position.rnChallenges, requirements and benefits for adopting the method used for floatover mating with a fixedrnsubstructure to a floating substructure, such as a SPAR, TLP or a semisubmersible are highlighted. Thisrnmethod is shown to be applicable for reducing schedule and cost risks for deepwater projects, the same wayrnit has been utilized for previous shallow water cases.
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