Heavy-lifting - Installation

Heavy-lifting - Installation


Offshore installation varies with the type of development involved. Fixed platforms have the most work involved; jackets and topside decks need to be transported to the well location. Once the jacket is in its final position and piled, the deck is lifted into position and welded to the jacket. Following the installation, the hook-up is completed to services and production lines on the jacket. Any additional modules are lifted into position, fixed and hooked-up to the deck unit, before the platform is commissioned.

Platform installation is executed with the same equipment on the vessel: topsides are installed with the topsides lift system (TLS), jackets with the jacket lift system (JLS) or, in case of small jackets, the 5000 t tub-mounted crane.

Topsides and jackets are transferred to Pioneering Spirit   in sheltered water after being transported to the vessel on a cargo barge. The vessel sails to the location with the topsides or jacket on board, and accurate positioning on DP takes place on location in the same way as for removals.
The active motion compensation system takes out all motions of the topsides relative to the base structure before lowering the topsides onto the base structure without impact.

Topsides installation in a single lift, reducing the amount of structural steel and minimising offshore hook-up activities as structures can be transported offshore in very large sections; entire platform topsides, up to a weight of 48,000 t, can be installed in one piece, pre-fabricated onshore. This can lead to significant field development cost savings.

Pioneering Spirit   installed three large platform topsides on Statoil’s Johan Sverdrup field on the Norwegian continental shelf. The installations started with the 22,000 t drilling platform topsides in June 2018, and the 26,000 t process platform topsides and 18,000 t living quarters platform topsides were installed in March 2019.

Read more about Pioneering Spirit  and the vessel’s jacket lift system.

Learn more about our fleet of specialised vessels.

Need help or have a question?

Our team of highly skilled engineers provide complete design solutions for some of the most challenging pipeline systems in the world, both in-house and by managing subcontracts with specialised
Pipeline installation Allseas has installed over 20,000 km of subsea pipeline worldwide using  S-lay technology, with diameters ranging from 2” to 48”. S-lay is characterised by
Pipeline protection In most parts of the world where oil and gas production takes place, there are many existing pipelines and cables on the seabed that must be crossed when installing a new
Subsea installation The offshore industry is experiencing a continuous move into deeper waters, more remote and hostile environments and more complex field developments. This trend presents new
Specialised pipelay operations Increasingly, oil and gas companies are prospecting and producing in areas that until recently would have been considered uneconomic or even impossible to explore.
Survey and subsea operations Allseas has a comprehensive range of vessel-based remotely operated vehicles (ROVs) and survey equipment utilising the latest high-specification sensors and equipment.
When oil and gas fields end production, their facilities need to be removed and disposed of (or recycled), a process known as “decommissioning”. Decommissioning of offshore structures is
Developing innovative new technologies and processes allows Allseas to stay ahead of the game by reducing cost and risk, while at the same time improving efficiency and operational performance.
Fabrication Our fabrication unit employs more than 200 people and provides a variety of activities in support of Allseas’ offshore operations. Custom-made subsea structures such as pipeline
Renewable energy technologies that can drive the global energy transition will require a significant increase in the production of metals, some of which are scarce or only available in a few
Working every day at sea, Allseas witnesses first-hand the devastating effect plastic pollution is having on the world’s oceans and marine life. Plastic pollution is a global problem, and we
Comprehensive oil, gas, water, and solids solutions wherever you need them Processing performance matters. Invest and derisk surface facility processing with services and solutions that
Production is about bringing a well to life and sustaining it for as long as feasibly possible. That takes soundly planned, accurately executed techniques with precision equipment to keep
Production technologies. Full service. Our integrated production chemical technologies and services provide tangible benefits and assurance to oil and gas operations worldwide, regardless of
Supporting midstream—from field separation and gathering through processing and transmission From routine maintenance and upgrades through facility design, construction, and operation,
Intervention expertise to maximize asset value Value-driven performance, superior execution. Halliburton delivers integrated well intervention through proprietary workflows, upfront