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Saipem 7000
''Saipem 7000'' is the world's second largest crane vessel, after the Thialf. The crane radius of the Saipem 7000 grants a lifting capability of 14,000 tonnes at 42 meters while the Thialf can lift 14,200 tonnes at 31.2 meters. It is owned by the oil and gas industry contractor Saipem S.p.A.
==Concept==
The Saipem 7000, originally named the Micoperi 7000, was conceived in the mid-1980s by its original owners Micoperi as a multipurpose offshore oil platform installation vessel that would be able to install very large oil production platform decks (known as integrated decks) as well as the decks' supporting structures (known as jackets) using its two very large fully revolving cranes. It would also be able to support the offshore completion of the platform by providing hotel and workshop facilities for large construction crews. Saturation Diving facilities would support subsea connection work. The vessel's size and semi-submersible form would allow it to operate in worse weather conditions than smaller and conventionally shaped vessels.
The huge cost of a vessel of this size would be offset by the cost and time savings made by the oil company as the large integrated decks could be completed, tested and commissioned onshore. Prior to the introduction of the large crane vessels offshore oil platforms were made up of 1000 - 2000 tonne modules which were lifted into place individually by smaller SSCV's or monohull crane vessels and then connected together offshore, tested and then commissioned, this often took over a year. Other savings in the installation of the jackets could also be made.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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