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155kV Export Cable Pull-In For Prysmian Group

Mobilisation : Equipment & Manpower : ROV Inspection & Monitoring : Cable Route : Cable Pull-in : Testing & Termination

Overview

Prysmian is a Global Leader in the Cable Systems Industry and a long-standing client of H&Askham. Prysmian approached H&A early in 2019, to complete the export cable removal, pull-in’s, cable management and test and termination support, on four separate North Sea offshore wind platforms – Borwin Gamma, Borwin Beta, Albatross, and the Dutsche Bucht. 

Each of these platforms presented its own unique challenges, which our project team delivered efficient solutions; through strategic planning, equipment supply, and the deployment of experienced teams, to deliver the project work scopes on time and on budget.

 

 

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This Case Study

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Project Location North Sea, Germany

'Prysmian was able to successfully connect and commission the Dutsche Bucht North and South, Global Tech AC106 and AC107, and Albatros export cables, as well as overcome all encountered challenges on the OSS and converter stations, thanks to the support and assistance provided by the highly skilled teams from H&Askham.'

Yelco Hernández Aguirre, Prysmian Group

Scope

H&A connected four North Sea offshore substation platforms, providing 220kV cable pull-in, cable preparation and testing and termination support; enabling the diver-less installation of interconnecting export cables, between four separate and very diverse platforms. Our teams were deployed to each platform prior to the arrival of the cable installation vessel – preparing each platform for cable pull-in operations. Following the pull-ins, our teams completed the hang off’s, prepared the cable cores – routing them to the jointing termination location and a further support team was deployed by H&A to carry out the testing and termination works. The Albatross Platform consisted of a J-tubeless monopile and whilst this is normal for Inter Array Cables, this was one of the first attempted pull-ins with an export cable of this size. H&A provided an ROV [Remote Operated Vehicle] with an in-house operator, to inspect and monitor the messenger wire recovery and each stage during the sub-sea pull-in operations until the Cable Protection System was fully engaged. Once completed the teams dismantled the 30te pulling winch and demobilised the equipment to shore.

Solution

Services involved in the delivery of this project:

  • Mobilisation of equipment and manpower.
  • Equipment Transport to the local port ready for offshore transportation.
  • Equipment set up and access scaffolding build.
  • Cable route preparation.
  • 220kV Cable pull-in operations.
  • ROV supply with operator for inspection and monitoring.
  • Cable preparation and termination support.
  • Demobilisation of personnel and equipment.

Multi-skilled in house teams

Despite the challenges encountered on each platform, they were overcome by our highly skilled teams, which include some of the most experienced in the industry.

Our multi-skilled in-house team of riggers, scaffolders, foremen, project engineers, site managers and project managers, adapted to any challenges presented, with a pro-active, flexible, problem-solving approach – demonstrating 100% professionalism at all times.