TechnipFMC: Westermost Rough Wind Farm – OrcaFlex Modelling Lowers Cable Costs



Less Cable Used

Knowledge Transfer to TOWL Team

ensured cables could be flown-in

increased confidence in the installation

SUMMARY

We provided Orcaflex analysis for Technip Offshore Wind Ltd to underpin and validate their installation procedure of the inter-array cables for the Westernmost Rough Development and ensure that cable damage was minimised. Our methodology allowed for the winches to be accurately sized allowing the cables to be ‘flown in’ reducing possible damage. We also provided formal training to the TOWL team to support their future developments.

SITUATION

We were contracted to support Technip Offshore Wind Ltd (TOWL) in the installation of inter-array cables for the Westermost Rough development, located 8km off the Yorkshire coast. The project was part of the UK Round 2 Offshore Wind development that has seen the installation of 42.5km of 33kV cables. Now completed, the wind farm exports 210 MW to the national grid. Our support covered carrying out cable and cable protection system installation using Global Dynamic Analysis tool, Orcaflex.

CHALLENGE

Technip Offshore Wind required us to provide Orcaflex analysis to underpin and validate their installation procedure to ensure that no cable damage was sustained during the cable pull into the monopile and/or electric substation. Technip Offshore Wind also looked to further develop their own engineers in this type of analysis for future developments.

SOLUTION

We placed multiple engineers on site in TOWL’s offices to provide analysis support through our extensive capabilities and expertise in Orcaflex. We carried out dynamic 1st end and 2nd end pull-in analysis of the procedures covering seven separate operations involving five cable/cable protection system (CPS) combinations across sets of environmental data.

The first model simulated the initial stage of the cable pull-in from when the CPS enters the water until engaged at the monopole. The second model simulated the final stage of the cable pull-in from when the CPS is first engaged through to the end of the cable pull-in to the transmission piece or offshore platform hang-off point.

Our Orcaflex modelling allowed us to optimise various aspects of the cable pull-in installation operations. We considered various vessel offsets for various cable lengths in different sea states allowing the TOWL team to carry the most efficient amount of cable per offshore campaign. Our analysis allowed for the winches to be accurately sized allowing for the cables to be ‘flown in’, a method where the cable does not contact the seabed making it faster and limiting damage to the CPS and cable. Following completion of work we provided, the models, analysis methodology and formal training to the TOWL team for future projects.

BENEFITS
  • We provided the model, analysis methodology and training to the TOWL team for future developments.
  • Our analysis methodology ensured that less excess cable was used decreasing cost.
  • Our analysis expertise increased confidence in the installation method decreasing risk.
  • We ensured cables could be flown-in – saving time and money.
  • We accurately spec winches – saving money.
  • Our onsite engineers allowed for knowledge transfer of our Orcaflex expertise and quick efficient support to the team.


We provided Orcaflex analysis for Technip Offshore Wind Ltd to underpin and validate their installation procedure of the inter-array cables for the Westernmost Rough Development and ensure that cable damage was minimised. Our methodology allowed for the winches to be accurately sized allowing the cables to be ‘flown in’ reducing possible damage. We also provided formal training to the TOWL team to support their future developments.



We were contracted to support Technip Offshore Wind Ltd (TOWL) in the installation of inter-array cables for the Westermost Rough development, located 8km off the Yorkshire coast. The project was part of the UK Round 2 Offshore Wind development that has seen the installation of 42.5km of 33kV cables. Now completed, the wind farm exports 210 MW to the national grid. Our support covered carrying out cable and cable protection system installation using Global Dynamic Analysis tool, Orcaflex.



Technip Offshore Wind required us to provide Orcaflex analysis to underpin and validate their installation procedure to ensure that no cable damage was sustained during the cable pull into the monopile and/or electric substation. Technip Offshore Wind also looked to further develop their own engineers in this type of analysis for future developments.



We placed multiple engineers on site in TOWL’s offices to provide analysis support through our extensive capabilities and expertise in Orcaflex. We carried out dynamic 1st end and 2nd end pull-in analysis of the procedures covering seven separate operations involving five cable/cable protection system (CPS) combinations across sets of environmental data.

The first model simulated the initial stage of the cable pull-in from when the CPS enters the water until engaged at the monopole. The second model simulated the final stage of the cable pull-in from when the CPS is first engaged through to the end of the cable pull-in to the transmission piece or offshore platform hang-off point.

Our Orcaflex modelling allowed us to optimise various aspects of the cable pull-in installation operations. We considered various vessel offsets for various cable lengths in different sea states allowing the TOWL team to carry the most efficient amount of cable per offshore campaign. Our analysis allowed for the winches to be accurately sized allowing for the cables to be ‘flown in’, a method where the cable does not contact the seabed making it faster and limiting damage to the CPS and cable. Following completion of work we provided, the models, analysis methodology and formal training to the TOWL team for future projects.



  • We provided the model, analysis methodology and training to the TOWL team for future developments.
  • Our analysis methodology ensured that less excess cable was used decreasing cost.
  • Our analysis expertise increased confidence in the installation method decreasing risk.
  • We ensured cables could be flown-in – saving time and money.
  • We accurately spec winches – saving money.
  • Our onsite engineers allowed for knowledge transfer of our Orcaflex expertise and quick efficient support to the team.
1st end cable pull-in to OSP
1st end cable pull-in to TP
Cable Installation Vessel
Inter-array cable installation operation
Pull-in winch tensions vs time. Orcaflex Results
Offshore Wind Farm

SECTOR

PROJECT ATTRIBUTES

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We considered various vessel offsets for various cable lengths in different sea states allowing the TOWL team to carry the most efficient amount of cable per offshore campaign

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