Decommissioning

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Safe, Compliant Decommissioning for End-of-Life Assets

AAXAL provides turnkey decommissioning solutions aligned with IMO, DNV, and NCDMB regulations, ensuring environmental protection and cost efficiency.

We execute complex decommissioning projects from engineering surveys to site restoration, ensuring compliance with IMO London Protocol, NORSOK D-010, and DPR Nigeria regulations. Our integrated approach minimizes environmental impact while optimizing costs.

Our Services

  • Decommissioning Project Management
  • Engineering & Survey
  • Shut Down, Plug & Abandon Existing
  • Development of Removal Plans
  • Flushing, Cleaning & Waste Disposal
  • NDT of Existing Padeyes/Trunions
  • Fabrication & Instl. of Padeyes/Trunions
  • Topside Equipment Lifting & Removal
  • Pump, Sump and Caissons Lifting & Removal
  • Riser Guard Removal
  • Creation of Cutting Points
  • Transportation, Offloading Decontamination & Break-Up
  • As-Left Survey
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End-to-End Decommissioning Solutions

Phase 1: Planning & Engineering

Regulatory Framework Development:

  • Decommissioning Security Agreements (DSA) preparation
  • Environmental Impact Assessments (EIA) per ISO 14001

Engineering Surveys:

  • Multibeam sonar seabed mapping (0.5m resolution)
  • ROV-based pipeline/cable route surveys
Phase 2: Asset Preparation & Structural Removal

Shut Down & P&A:

  • Wireline plug setting (Baker Hughes E-4 packers)
  • Cement integrity testing via ultrasonic cement evaluation

Flushing & Waste Management:

  • Closed-loop cleaning systems (0% discharge)
  • TerraTox-treated sludge disposal

Structural Removal:


Structure Removal Methodology Equipment
Topside Modules Single-piece lifts up to 8,000MT Saipem 7000 crane vessel capability
Jackets Explosive cutting at -50m depth Hydra Tec underwater demolition tools
Pipelines Jetting/trenching for burial ROV-mounted jet sleds
Phase 3: Site Restoration

Debris Clearance:

  • Grapple systems for large debris
  • Magnetometer surveys for metallic waste

Final Verification:

  • As-left seabed surveys per OSPAR 98/3
  • Biological monitoring for 12 months post-removal