Longitude has carried out the detailed design and engineering for all types of offshore decommissioning projects, from jackets and topsides through to MOPU and FPSOs including their moorings and risers.

Marine and offshore decommissioning engineering

Longitude combined with our sister company LOC’s long-term marine experience, is highly experienced with all types of vessels, from tugs and barges to DP construction vessels and module carriers.

To execute these installation engineering projects, our specialist engineers provide a range of services, such as:

  • Dynamic lift analysis in air and through the splash zone
  • Motions, mooring and stability analysis
  • Grillage and seafastening design
  • Structural integrity assessment of the platform and decommissioning vessels
  • Structural design for decomissioning
  • Mooring line pull in assessment
  • Floatoff Engineering
  • Risk Assessment
  • Preparation of Operational Procedures and Method Statement
  • Dropped Object and Impact Analysis

Longitude’s experience in decommissioning covers single piece heavy lift decommissioning for entire topsides, development of novel concepts as well as engineering for modular or piece by piece removal.

Key Contacts

Oil & Gas Market Lead, Longitude

London, Longitude

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Managing Director, Longitude USA


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Case Studies View All

Decommissioning Barge Conceptual Study

Longitude Engineering was contracted by PTTEP Thailand to develop the conceptual engineering for a fixed platform decommissioning asset via reverse floatover and jacket lifting. FACTS AND FIGURES: Can accommodate the…

Design of Decommissioning and Removal of MOPU Cendor and Associated Wellhead Structure with Conductors

The CENDOR MOPU PRODUCER was installed in Cendor field in 2006 to produce from the field until such time as further field infrastructure is installed and decommissioned. It is…

FEED Study MOPU Saparmyrat Turkmenbashi and Oguzhan FSO Decommissioning

Longitude were contracted by Petrofac RNZ and Petronas to provide the full range of naval architecture and structural engineering service for the FEED study of MOPU Saparmyrat Turkmenbashi and…