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Each Asset is Different

Every dismantling project presents a unique requirement in terms of planning and execution.  As every asset is built in a bespoke way, logic dictates they must be dismantled in a similar bespoke manner
The procedure for dismantling an assetwill always be bespoke, even within the same asset class. Despite looking similar, vessels are very different in the way internal elements are assembled and therefore need careful planning and consideration as to how to be dismantled.
FPSO: A dry-dock, or a slipway presents significant benefits for the decommissioning of an FPSO. However, workarounds are available for facilities lacking those capabilities.
FPSS: Once the vessel is on the quayside, it can be kept floating or landed on the seabed for steps 2-4.
TLP/SPAR: The deck would generally be lifted off the hull offshore, and both would be transported to shore separately for dismantlement.
Jack-up Rig: The legs of the jack-up rig could be used to position the vessel to facilitate dismantlement. Following this however, they will need to be lifted or dragged from the water and dismantled.
Onshore Well Stations: Consideration needs to be given so as to return the environment to how it was.

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The devil is in the detail

FPSO Typical De construction Process

  1. Secure the vessel to the quayside, dry dock or graded bay

  2. If necessary, clean the vessel further to ensure all waste from production is removed

  3. Remove all loose modules or equipment such as storage units or accommodation modules

  4. Dismantle and dispose / recycle modules, equipment, and material as it is taken off the vessel

  5. Once the hull is bare move ashore or keep in working station

  6. Dismantle and dispose / recycle the rest of the hull

When deciding to decommission a floating asset as part of the abandonment of a field, the asset owner must outline a plan for the asset, which can include stacking, removal for re-use, recycling or refurbishment, or final decommissioning

Asset De Commissioning Onshore Preparation (Shipyard) 

There is a significant degree of planning and preparation required from the yard before a project can be delivered, with each project representing unique challenges due to the bespoke design and age of the floating assets



Clean up is critical

Prepare all the appropriate documentation, authorizations and permits, to ensure assets, with potentially hazardous waste onboard can come along the facility and be moored.
Securing the Asset
Review the facility and establish how the asset will be secure at the quayside or dock.
Verification of all material (hazardous and non-hazardous), and cross-check with documentation provided by operator / asset owner. Includes further cleaning of the asset prior to removing equipment/ modules.
Waste Management Plan
Ensure plans, and procedures for managing all the waste in-house and transporting it to other facilities for further processing or disposal, are in place.
Project Management – Asset Dismantling Processes
Finalize bespoke dismantling and disposal plans for the asset in co-ordination with the asset owner.
Asset Dismantling
Removal of module topsides, storage, derricks etc. from the hull. Dismantle and dispose / recycle all loose items as they are removed. Where possible, land the hull in a dry dock ahead of dismantling.
Waste Disposal
Dispose of the waste (hazardous or not) in a safe and environment-friendly manner, recycling wherever possible. Materials are typically moved to a third-party location

De Commissioning Considerations: Services
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