The plan to use a floating installation method for Parkwind’s Arcadis Ost 1 was announced for the first time in November 2019. Pioneering Spirit (formerly Pieter Schelte) is a catamaran crane vessel owned by the Switzerland-based Allseas Group designed for the single-lift installation and removal of large oil and gas platforms and the installation of record-weight pipelines. Inspired by the offshore heavy lifting pioneer Pieter Schelte Heerema (190881) and designed completely in-house, the vessel is designed for the single-lift installation and removal of large oil and gas platforms and the installation of record-weight pipelines. Heerema will be installing the 7,150 metric ton Baltic Eagle Offshore Substation (OSS) on behalf of its client Baltic Eagle GmbH, before moving onwards to install 27 wind turbines for Parkwind's Arcadis Ost I wind farm in the Baltic Sea using its novel Rotor Nacelle Assembly (RNA) installation method. The turbine was installed using Heerema’s Thialf semi-submersible crane vessel instead of the typical method using a jack-up vessel. Pioneering Spirit (formerly Pieter Schelte) is the largest construction vessel in the world. The team fabricated around 150 metric tons of structures required for the modification," the company added. "The project has been greatly collaborative and was a Heerema Group effort as Heerema Fabrication Group's Opole Yard completed most of the fabrication work. Using this system, Heerema can lower Thialf's cranes and fold the A-frames to create a sufficient air gap when combined with ballasting between the vessel and the Storebaelt Bridge. The lifting capacity of Thialf is unchanged, with the vessel capable of lifting 14,200 metric tons, the company said. This action is possible as Thialf's A-frames already have hingable corners that can accommodate the NOV custom-designed semi-permanent adjustment system. 3 Conversion to a DCV was carried out in 2001. 2 In the early 1980s these vessels set several lift records while operating in the North Sea. Balder and sister vessel, Hermod were the world's first semi-submersible crane vessels. When Thialf was moored in the Port of Rotterdam over the winter of 2021-2022, the team onboard successfully executed modifications to the vessel's A-frames. The Balder was constructed in 1978 as semi-submersible crane vessel by Mitsui Engineering & Shipbuilding Co., Ltd. While ballasted down to Thialf's maximum draught the total air draught was just under 65 m with the A-frames down," the company said. "This crossing is the first time a Heerema crane vessel has accessed the region and is the result of innovative crane alterations to enable passage below the bridge. Dutch offshore installation firm Heerema Marine Contractors said Monday its semi-submersible crane vessel had crossed the Storebaelt Bridge, known as the ‘gate to the Baltic Sea.'
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