Offshore - installation - decommission - salvage


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Plattform Jacket decomissioning equipment - Heavy Lift salvage bouys system



Set of 4 Buoyancy Tanks Assemblies(BTA) for offshore decommissioning or salvage with lifting capacity of 12.000 TON Gross.

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  • Data sheet

    ManufacturerAker solutions - Norway
    ModelBTA DP2
    Performance specificationAbout 12.000 TON lifting capacity.
    ClassDocumented and DNV certified method for removal of jackets

    More info

    Advantages of the Buoyancy Tank Assemblies


    Installation and removal of marine structures can be done without crane lifting capability

    Safe principle of operation with comprehensive systems & operations description

    High total floating capacity

    Documented and DnV certified method for removal of jackets

    Patented technology

    Flexible transit by tow, on barge or by ship

    Unique technology and equipment, the 4 BTAs’ are the only existing ones


    Buoyancy Tanks Assemblies (BTA)

    Total length of assembly 65 meter

    Maximum width of assembly 13.7 meter

    Overall Diameter of each tank 6.6 meter

    Length of each tank 53 meter

    Maximum draft during installation 59 meter

    Dry weight of assembly 1025 MT

    Net lifting per assembly 2250 MT

    The system consists of four identical assemblies with comprehensive systems & operating description

    The utilities for ballasting and control are not included

    DnV certified for removal of jackets

    BTA ballast system description

    One 4” combined seawater inlet/outlet line and one 4” combined vent/compressed air supply line to each ballast compartment.

    Each seawater inlet/outlet line is equipped with one remote operated valve and one ROV operated valve, the latter for contingency purpose.

    The vent lines are connected to a distribution manifold located inside the pyramid at the top of the BTA. This manifold is equipped with two remote operated vent valves and one remote operated valve to segregate the air flow between the lower ballast tanks and the upper ballast tanks.

    In addition there are two inlets for compressed air which are equipped with check valves.

    Each vent line is equipped with an in-line block valve outside the pyramid for use during Roll Over and Roll Back operations.

    Compressed air for ballasting is supplied from a compressors located on the OSV via two air hoses (part of the umbilical) connected to the distribution manifold on the BTA.


    Video of offshore rig decommissioning using BTA Buoyancy Tank Assemblies"