Design of heavy lift quay and roro Westhofhaven Vlissingen-Oost

The Netherlands (2018)

Project facts:

  • Client

    Sagro

  • Organisation North Sea Ports, DCMR, Heerema Marine Contractors & Ale Heavylift

  • Implementation period 2018 - 2019

  • Project budget Confidential

The challenge

Many offshore oil and gas platforms in the North Sea are at the end of their life cycle and will be dismantled in the coming years. The demand for offshore decommissioning is expected to increase. The Sagro terminal in the port of Vlissingen-Oost (Netherlands) is an excellent location for the storage and decommissioning of offshore installations. The facilities at the terminal are ideal for environmentally friendly dismantling and recycling. Sagro is investing in a new quay and more production capacity at the terminal. The quay is specially designed for large offshore projects.

Copyright pictures: Sagro, Wiki Offshore, Walhout Civil

Our activities

The heavy lift quay was designed by Walhout Civil. The designers opted for a robust combination wall with a heavy anchoring construction. A roll-on-roll-off facility for heavy ramps will be installed in the wall cope, to enable loadouts with rolling equipment and heavy project cargo. The quay will be equipped with a concrete loading platform and special pile foundation due to extremely high top and shock loads. The quay is suitable for 600-ton lifts and 8,000-ton loadouts (offshore oil platforms on SPMT configurations). For the design, Walhout Civil collaborated with specialists from Sagro, Heerema Marine Contractors and Ale Heavylift, Mammoet. The realization of the quay will start at the end of 2019.

A summary of our activities:

  • Final design of the heavy lift quay
  • SCIA & Plaxis stress and FEA analyzes
  • Interaction analyzes of combination wall and platform
  • Analysis of soil parameters and bathymetric surveys
  • Load simulations loadout jackets, platforms and topsides
  • Geotechnical advice for the storage of offshore structures
  • Environmental analysis, nautical safety, ATEX zoning
  • Coordination with North Sea Ports, DCMR and contractors
  • Obtaining required construction permits

Tyra Redevelopment Project

Sagro offers, through its specialist decommissioning services, a service that is unique in the Zeeland seaports. The new quay will be used by the company for the Total E&P Denmark's Tyra Redevelopment Project. Sagro has acquired several decommissioning contracts from Allseas and Heerema. One of the projects consists of the decommissioning of four offshore jackets with a combined weight of more than 10,000 tons. For another project, 16,000 tons of steel are being dismantled from offshore topsides, bridges, flare towers and jackets. The ship Pioneering Spirit will lift the structures on the North Sea and transport them to the port of Vlissingen-Oost.