Decommissioning Engineering Support

Elgenio provides practical engineering support for offshore and subsea decommissioning projects, from early removal studies through detailed engineering, mobilisation and offshore execution.

Our experience includes structure recovery, subsea cutting, lifting, rigging, dynamic recovery analysis, seafastening, vessel integration, temporary works and offshore project support.

We develop decommissioning solutions around the actual condition of the asset, available vessel capability, recovery method, installation constraints and offshore execution sequence.

What We Support

Our decommissioning experience covers a broad range of offshore removal and recovery activities, including:

  • Subsea Structure Removal & Recovery
  • Conductor & Guide Frame Removal
  • Subsea Cutting & Size Reduction
  • Lift Planning & Rigging Engineering
  • Dynamic Recovery & Splash-Zone Analysis
  • Structural Condition & Lift Assessment
  • Seafastening & Vessel Deck Engineering
  • Recovery Method Development
  • Temporary Works & Installation Aids
  • Offshore Project Engineering & Mobilisation Support

Engineering Around the Recovery Method

Decommissioning projects often involve ageing structures, incomplete design information, uncertain condition and recovery methods that differ significantly from the original installation sequence.

Elgenio develops the engineering around the proposed removal method, considering structural condition, cutting strategy, lifting, rigging, vessel capability, dynamic response, deck handling and seafastening as one integrated recovery problem.

Relevant Services

Lift Planning & Review

Lift engineering, rigging design and technical review for offshore recovery and removal operations.

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Structural Design

Structural assessment and verification for ageing structures, lift points, temporary works and recovery systems.

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Dynamic Analysis

OrcaFlex analysis for recovery, splash-zone response, lifting and offshore operating limits.

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Project Engineering & Mobilisation Support

Engineering coordination, vessel integration, mobilisation planning and offshore execution support.

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Equipment Design

Bespoke offshore and subsea equipment developed around project-specific recovery and handling requirements.

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2D, 3D & Point Cloud Design

Engineering design, draughting and 3D development supporting removal planning, interfaces and offshore execution.

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Selected Decommissioning Projects

Examples of decommissioning engineering delivered across subsea removal, recovery, lifting and vessel integration scopes.

WHPS Decommissioning and Recovery

WHPS Decommissioning & Recovery

Structural verification, lift analysis, rigging, recovery engineering, seafastening and offshore support for recovery of three subsea structures.

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Dunlin Alpha CGF Removal Engineering

Dunlin Alpha CGF Removal Engineering

Integrated decommissioning engineering covering structural assessment, subsea cutting, rigging, dynamic recovery analysis and offshore execution planning.

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Manifold Recovery

Manifold Recovery

Recovery analysis, rigging redesign and simplified seafastening developed for efficient offshore recovery and vessel transport.

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Need engineering support for an offshore decommissioning project?

From removal studies and recovery analysis through detailed engineering, mobilisation and offshore execution, Elgenio can provide practical support throughout the decommissioning scope.

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