Crossway Eagle 10 yrs SPS at Windport

OTHER PROJECTS
Written By Maja Waage

Semar’s innovative barge-supported leg lift method was applied during the 10‑year Special Periodic Survey (SPS) of the Crossway Eagle, a three‑legged self‑elevating accommodation jack‑up unit designed to maintain gangway connection in adverse sea conditions. Semar provided both engineering and operational support throughout the yard stay at Windport in Mandal—a project that required deep technical expertise, careful planning, and precise execution.

 

Instead of dry-docking the Crossway Eagle, a barge was used to support the hull while lifting one of the three legs at a time, enabling spudcan inspection and repair. The existing seabed preparation at the Windport yard in Mandal was designed for a three‑legged jack‑up. During the inspection and repair work, Crossway Eagle was elevated on two legs, while the barge—positioned with exceptional accuracy—reduced leg loads and provided stability against overturning. This approach enabled an efficient and safe turnaround within a tight schedule.

 

Semar provided a turn-key solution, including supply of tugs and barge required for the marine operations. The operation required only one jack‑up position and orientation, while the barge was repositioned three times.

 

Personnel from Semar performed the analyses, designed the cribbing layout, issued operational procedures. During operation, Semar provided Tow Master and Load Transfer Managers throughout the various phases of the yard stay and associated operations.

 

Scope of work summary

  • Barge feasibility check
  • Method design and documentation
  • Modelling and structural check of Crossway Eagle
  • Stability assessments and ballast plans
  • Cribbing layout drawings
  • Jacking procedures
  • Marine operations procedure
  • Charter of vessels
  • Procurement and rental of equipment
  • Mobilisation and follow-up

Key figures

Client: WindPort

End client: Macro Offshore

Project duration: 2025

Project characteristics: Barge-supported leg lift operation

Mobilisation port/yard: WindPort Mandal

Semar project roles: Tow Master, Load Transfer Managers, Marine Operations Manager and Field Engineers

 

“As part of the scope we inspected the spudcans using a barge instead of dry dock, enabling an

  efficient and safe turnaround within a tight schedule.”

  - Stian Eiken, Macro Offshore (LinkedIn)

Maja Waage
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