Page 36: of Offshore Engineer Magazine (Sep/Oct 2023)

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shore & marine unit. shore, and recycling of the Tyra East Alpha (TEA) and Tyra

Today, TotalEnergies is the operator of the Tyra ?eld West Alpha (TWA) topsides and jackets, integrated produc- on behalf of Danish Underground Consortium (DUC) tion facilities (IPF) module, two ?are jackets, and monopile.

– a partnership between TotalEnergies (43.2%), BluNord In total, Pioneering Spirit removed more than 35,000 (36.8%) and Nordsøfonden (20%). tonnes of offshore facilities from the ?eld.

All in all, 50,000 metric tons of material were removed, which according to TotalEnergies, is the equivalent of sev-

REMOVALS

In July 2020, Heerema's giant LNG-powered semi-sub- en Eiffel Towers.

mersible crane Sleopnir vessel, equipped with a pair of revolv-

INSTALLATION ing cranes that can lift 20,000 tonnes in tandem wrapped up the ?rst phase of the Tyra decommissioning when the top- Heerema Marine Contractors' Sleipnir semi-submersible sides, including wellhead and riser platforms, were removed. crane vessel in September 2020 installed two new Draga-

The second phase of the decommissioning campaign dos Offshore-built jackets, which formed the foundation consisted of two main lifts of the two integrated accommo- for the new Tyra process and accommodation platforms. dation and processing platforms at Tyra East and Tyra West. The two jackets were the ?rst new jacket structures de-

Allseas’ giant catamaran Pioneering Spirit was employed livered and installed for the Tyra redevelopment project.

for this part of the campaign, removing both topsides in The vessel then also installed the remaining new Tyra single lifts. II modules including the Rosetti Marino-built accommo-

The 14,000-tonne TEA topsides and 7,800-tonne TWA dation module, six wellhead and riser modules, and four topsides were removed with the vessel’s motion-compen- bridges in September 2021 and April 2022.

sated topsides lift system. For the smaller, lighter struc- In early October 2022, Heerema Marine Contractors tures, the vessel’s then newly aft-mounted 5000 t. installed the TEG module, described as the biggest Tyra

In September 2022, Allseas’ Pioneering Spirit removed II project topside, on the last remaining bare jacket at the two more offshore jackets from the ?eld and sent them for Tyra offshore ?eld.

recycling. The removal of the two jackets concluded All- Heerema said that it had broken a world lifting record seas involvement in the Tyra Redevelopment Project. with the installation of a 17,000 metric ton, 47-meter-

Allseas’ role in the redevelopment project covered engi- tall, Tyra TEG module. Heerema’s Sleipnir lifted the giant neering, preparation, removal, transportation, load-in to module from the heavy transport vessel GPO Emerald, september/october 2023 OFFSHORE ENGINEER 37