To main content

Platform reinforcement, DABRAT

Boskalis Offshore was awarded a contract by Maersk for the DABRAT project, involving both the preparation and construction work to the Dan A and Dan B offshore oil production facilities. The extensive scope not only included the subsea installation and removal work, but also fabrication of structural items, procurement, setting up and testing of lift equipment and structural examinations. The works covered the years 2013 and 2014.

The oldest Maersk Oil field, Dan Bravo, is located in the Danish sector of the North Sea. The first platform in the complex was installed in 1972. The complex consists of platforms A, B, C and D. The Dan B platform forms the production hub of the Dan Bravo Complex and Dan A platform is one of the wellhead platforms at the Dan Bravo complex. Maersk Oil decided to carry out a platform lifetime extension program for the forty year old jacket structure to extend the service period of the structure until 2042.

General summary of the work scope

  • Reduce sea wave load unto the jacket structure by removing old boat fenders and pump caissons.
  • Inspection history enhancement by investigating all available inspection data, searching for known cracks in the subsea structure and inspecting potential problem areas.
  • Remove crack or damaged areas and replace with new structure (e.g. conductor guide level).
  • Reinforce subsea structure by adding retrofit (clamped) structures to strengthen key areas.
  • Renew consumables by retrofitting additional anodes by means of clamps due to depletion and removing some of the original anodes.
The 2013 offshore campaign started in July and was completed in September. During this campaign Boskalis performed the 3D subsea photogrammetry activities, classified as world’s largest ever undertaken, by air/saturation diving and ROV operations acquiring exact geometrical information of subsea K-joints to be able to design reinforcement clamps. Operations were performed on depths varying from 10 to 41 meters. Besides the technical challenges the environmental conditions as sea-state, fog and subsea reduced visibility (minimum 2 meter required for image taking) dictated the progress of the work.

Related projects

Selected filters

Jotun A

The Jotun A FPSO, a 92,000 DWT FPSO capable of producing 70,000 bpd, began producing in 1999 on the Jotun field (Norway). As part of Vår Energi’s investment in increased oil recovery from the Balder field in the North Sea an upgrade of the Jotun FPSO is required. The Balder Future project will extend the life of the field (PL 001) by 2045, giving Norway’s oldest license a lifetime of 80 years.


L10 -C -D & -G Decommissioning

Neptune Energy Netherlands B.V. (Neptune) has awarded Boskalis the contract for the removal, transport and load-in of three platforms. These platforms are located in the Dutch North Sea,
approximately 90 km west of Terschelling.



Royal Boskalis Westminster is a leading global marine contractor and services provider. With safety as our core value, we offer a wide variety of specialist activities to the oil & gas and renewa-bles sectors. These activities include marine instal-lation and decommissioning, seabed intervention, marine transport and services, subsea services and marine survey. In addition, Boskalis is a global dredging contractor, provides towage and terminal services across the globe and delivers marine salvage solutions. By understanding what drives our clients we are able to provide the solutions that enable them to meet their specific business goals. For this reason we are constantly looking for new ways to broaden and optimize our offering and are committed to expanding our proposition, supported by our financial strength. With our committed professionals in engineering, project management and operations, 800 special-ized vessels and an unprecedented breadth of activities in 90 countries across six continents we help our clients in the offshore industry push boundaries and create new horizons.


1915 Çanakkale Bridge

The 1915 Çanakkale Bridge, also known as the Çanakkale Strait Bridge, is a proposed suspension bridge being constructed in the Çanakkale area in Turkey. Situated just south of the towns of Lapseki in Asia and Sütlüce Village in Europe. The bridge will span the Dardanelles strait, about 10 km south of the Sea of Marmara.

Aberdeen bay offshore windfarm project

Boskalis was responsible for the eleven suction bucket jacket foundations, scour protection, 66 kV inter array and export cables and the installation of the wind turbine generators.


NASR full field development

Boskalis was subcontracted to install 2 topsides and 3 jackets in the NASR and Umm Shait oil fields: The Accommodation Platform/AP Jacket, the Separation Platform/SP Jacket and the Gas Treatment Platform/GTP Jacket are installed in the NASR Field. The installed net weights of the jackets ranged from 2,270 to 3,070 metric tons.