BM-T700 - Multi-purpose motion compensation platform

BM-T700 information brochure

The BM-T700 is a modular platform with a payload capacity of 700 mT, or it can accommodate for a crane with an average capacity of 160 mT at 12 meters radius. The BM-T700 platform compensates waves up to significant wave height of 2.5 meters. The BM-T700 platform and foundations consist of containerized units, which can be assembled  within 10 working days.

The BM T700 is designed to increase the safety and workability of offshore construction works. A triangular shaped platform is not moving relatively to the fixed world. It can be used for various forms of construction operations. The following types of operations can typically be conducted with the system:

  • Installation of small modules and connection/piping bridges.
  • Supply of WTG components for the installation of an offshore wind farm.
  • Crane operations; for example the recovery of cargo in a  salvage operation.
  • Drilling; for example the drilling of a mooring foundation for a FPSO. 
  • Piling; for example the foundation piles for an LNG jetty.

 

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Videos

3D motion compensated pile drilling Platform testing at the North Sea The making of BM-T700 Crane operation Supply operation

Specs

General
Crane capacity160 mT at 12 m
Platform payload capacity      700 mT
Compensation
Wave heightHs 0 - 2.5 m
Wave period4 - 18 s

Heave, roll and pitch motions

95% 

Onboard lifting functionality
Footprint dimensions            
Foundation18.3 x 15.1 m         
Control room and HPU 12 x 2.5 m
Platform working area12 x 12 m
Weight
Platform and foundation        270 mT                
Control room and HPU63 mT
Transport
The complete Barge Master can be shipped in
standard sized containers
Certifications                                                  

 

Workability

The workability of (crane) barges and supply vessels in offshore lifting operations will increase significantly with the use of the BM-T700, as depicted in the right figure on this page. The figure shows the simplified overview of wave distribution spread over the whole year. Where the white area indicates the workability without the BM-T700, the grey area indicates the increased workability of a typical lifting operation. 

The BM-T700 increases the safety and workability up to significant wave height of 2.5 meters, which leads to significant reduction of project costs, while the project planning can be met. 

Barge Master T700 operational envelope Typical workability increase for lifting operations with a Barge Master T700

Technology

The Barge Master measures vessel motions and actively compensated roll, pitch and heave by means of three hydraulic cylinders. The surge, sway and yaw of the vessel can be constrained by using a dynamic positioning or a traditional anchor system. The controller measures the motions of the vessel using motion reference units. The cylinders are controlled by means of velocity feed-forward and position feedback. Redundancy is applied to the critical components assuring safe motion compensated offshore lifting.

The graph below illustrates the effect of the compensation over a period of 5 hours on the North Sea. The measured residual motions are 14 mm in the heave direction, 0.05 degrees in roll and 0.02 degrees in pitch.

5 hour compensation example Compensated (Left) and constrained (Right) motions

Sales & Rental

The BM-T700 can be rented or purchased. The system functions as a multifunctional platform for numerous applications as it is capable of both supporting equipment and supplying a load. Only the Barge Master needs to be mobilized to form a motion compensated crane barge. Standard barges and cranes can be sourced locally. Since the entire system is fully containerized mobilization costs are kept to a minimum. 

Interested in purchasing or renting a BM-T700 system? Get in touch with us

Barge Master