The London Array

  • Client: Visser Smit & Hanab
  • Location: Ramsgate, Kent, UK
  • Project Start Date: July 2011
  • Project End Date: December 2012


London ArrayThe London Array development is a wind farm in the Outer Thames Estuary and will be situated midway between the Kent and Essex coastlines, more than 20 km (12 miles) from each shore. Phase 1 consists of 175 turbines, installed on the Long Sand and Kentish Knock banks and in the Knock Deep channel that lies between. The electricity produced by the wind turbines will be transmitted through 33kV sub-sea cables to two offshore substations. These substations will be connected to a new onshore substation at Cleve Hill, near Graveney in North Kent.


H&Askham at London Array

Visser & Smit HanabH&Askham were awarded the works at London Array in June 2011 and maintained a full-time presence on the project since July 2011 where we supply at times in excess of 40 men on a 24 hour rota to conduct the following works on the phase one turbines.


The contracted work comprises of hang-off, routing, fixing, termination, testing and jointing of the cable, including the following:


  • Installation of the J-tube hang-off arrangement.
  • Routing of the cable from the cable hang-off point to the T Box or termination point andcleating every 0.5m.
  • Preparation ofcable ends and fitting of T connectors.
  • Termination of the 33kVcable.
  • Termination, splicing and testing of the FO cables.
  • Testing of the cables by OTDR, TDR and IR tester.
  • All power jointing and cable testing at Clevehill 132kV Sub-station.


Project Management at London Array

With large numbers of personnel working on a 24 hour basis management of this project has been of paramount importance.


London Array

H&Askham set up a dedicated office in the Port of Ramsgate to ensure the project could be closely monitored and controlled. An Offshore Coordinator was appointed to work alongside our Project Manager and liaise closely with our client on all aspect of works planning, staff allocation, health & safety and Quality Assurance.


H&Askham have now developed a number of systems to track and record the project activities andcan easily draw from this to provide reports to theclient and for our own internal analysis and review.