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 hang–off 
  • 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.