Decom Mission

Allseas Group S.A. is a world-leading contractor in offshore pipeline installation, heavy lift and subsea construction.

Our approach is to support clients already in the conceptual design stage, and offer services for project management, engineering and procurement up to and including installation and commissioning.

Allseas owns and operates a state-of-the-art fleet of specialised heavy-lift, pipelay and subsea installation vessels designed and built in-house. The latest addition to our fleet, the 382 m long, 124 m wide dynamically positioned heavy lift and pipelay vessel “Pioneering Spirit”, is designed for the single-lift installation and removal of large oil and gas platforms and the installation of record-weight pipelines. In August 2016 the vessel successfully removed the 13,500 t Yme platform in a single lift, setting a record with its first commercial contract.

The emergence of “Pioneering Spirit” signifies a step-change in offshore installation and decommissioning. Designed to install and decommission platform topsides of up to 48,000 t and jackets of up to 25,000 t in a single lift, she will significantly reduce the amount of offshore work associated with installation and decommissioning by moving the work onshore where it is safer and more cost effective. Complementing the lifting systems is a 5000 t special purpose crane for additional lifts such as lighter topsides and jackets, modules and bridges. Moreover, with an S-lay tension capacity of 2000 t, she surpasses Allseas’ “Solitaire” as the world’s largest pipelay vessel.

The current trend of dismantling, lifting, removing and transporting heavy offshore structures, such as topsides and jackets, module by module is an expensive, high-risk activity for those involved. It also poses a serious threat to the environment. An entirely different concept, “Pioneering Spirit’s” unique single-lift capacity for platforms surpasses the capabilities of existing crane vessels, thereby extending the currently existing installation and decommissioning capabilities.

For over 30 years, Allseas has developed cutting-edge technologies and has pushed boundaries in offshore technology. By continuously growing our know-how and expertise, we have developed into a world-leading offshore contractor. We continuously challenge ourselves to think outside the box to improve our business and the product of clients.

Clearing up the past, building for the future

In the past two decades AF Offshore Decom has as the main contractor and consortium partner safely prepared, removed, dismantled and recycled more than 300.000 tons of oil & gas infrastructure from the North Sea. Our extensive track record includes more than 45 offshore installations and beyond 5 million project man-hours of decommissioning experience both offshore & onshore.

As a dedicated, focused player we are a catalyst for the oil and gas industry’s transition by offering integrated decommissioning solution for the global offshore market increasing customer efficiency, mitigating risk and maximizing the recycling potential.

Our experience and large in-house capabilities enable us to handle any projects. We will lead and shape the market for environmentally friendly decommissioning offshore. We are a part of the circular economy and are committed to accelerating the transition to a more sustainable future

In a world where resources are finite and the earth’s ability to absorb carbon emissions have been depleted, the future rests on our ability to recycle and reuse resources and materials. This is our commitment.

This is our core business – and only business.

AISUS specialise in remote offshore inspection solutions, pioneering new technologies designed to solve and improve on key industry challenges. Innovation is at our core, with a focus on safe, cost-effective and time efficient services that support a variety of inspection requirements.

We have secured a strong reputation for operational excellence and a track record for safe, high quality and successful project delivery, including advanced and visual inspection, laser scanning, digital x-ray and bespoke solutions across the energy industry.

As offshore decommissioning continues to gather pace, asset integrity solutions remain critical. Understanding the condition of offshore assets prior to decommissioning allows for efficient planning and cost-effective execution. By identifying any integrity issues beforehand, operators can determine the appropriate decommissioning methods, estimate the required resources, and mitigate potential complications that may arise during the process. Our team of experts work directly with our clients to design and engineer a solution that delivers clear and measurable results to understand the condition of structural components.

Since 1966 ABLE have been enabling the development of strategic land and marine sites in the UK.

ABLE is the market leader in the field of demolition and marine decommissioning and is now a significant land developer and port operator.

Our ethos surrounds versatility and hard work – we boast significant in-house capacity to provide solutions across design, construction, civil work and environmental services.

Our strong and successful track record of undertaking projects in challenging environments makes us a reliable partner for a number of blue-chip, multi-national clients