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Jan De Nul – Cable Replacement on Borkum Riffgrund 01 OWF – June 2019 to August 2019 – 2 Array Subsea Cables 

CS was contracted to Jan De Nul for the HV & FO termination & testing works associated with the removal and replacement of 2off faulty subsea cables.  WE were responsible for the Termination & Testing of the PCC cables between the Offshore Substation and Wind Turbine Generators, including: 

  • Mobilising 16 Technicians and 1 Offshore Installation Manager 
  • Pre-project meetings 
  • Procurement of High Voltage and Fibre Optical materials  
  • Site visits 
  • Creations of RAMS 
  • Creation of quality documentation 
  • Project HIRA meetings 
  • Load out Testing 
  • Post Lay Testing (continuity, insulation resistance, Time Domain Reflectometry and Optical Time Domain Reflectometry). 
  • On the OSS & WTG’s offshore assets: 
    • Assisting SAP’s to create a Safe System of Work 
    • Cutting of existing array cables ready for extraction 
    • Stripping the array cables to expose the HV cores and FO cable 
    • Complete the permanent hangoff 
    • Route the HV and FO cable into the OSS/WTGS 
    • Cleat the HV cores from the hang off to the GIS  
    • Terminate and splice the FO cable into the cabinet 
    • Terminate three power cores into the GIS 
    • Complete post installation testing from the onshore substation to the floating asset (IR, TDR & OTDR) 
    • Deliver an Inspection and Test Plan for the installed and tested system, forming part of key payment milestone. 
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