Cathodic protection system installation

James Fisher Marine Services* was appointed by Dover Harbour Board to install a new Cathodic Protection System on Monopile C at Pier 6 in the Eastern Docks.

Dover Harbour Board (DHB) requested that local companies and employment were to be utilised as much as possible.

Cathodic protection system installation2

The challenge

  • James Fisher Subtech’s (JF Subtech) scope of work included:
    • Dive team weld testing and coding for approval to complete the works
    • The removal of existing defunct Impressed Current CP System
    • The installation of brackets for mounting the anodes
    • Video survey and installation of topside test unit for monitoring of the CP System from the surface
  • To meet the request of DHB, JF Subtech had to utilise local companies and employment as much as possible for the installation of the system.

The solution

  • JF Subtech hired the Dover-based work vessel Sealift III and used a local fabricator for the test pieces, anode jigs and replacement pad eyes, as well as local suppliers for ancillary items. A dive team was also accommodated in a locally-run hotel for the duration of the works.
  • The CP System was installed and designed by Corrosion Prevention Ltd, who also acted as the consultant to DHB during the project.
  • The anode design was assessed by JF Subtech’s Project Engineer, Nadine Stanistreet, who then tasked Impalloy Ltd to supply the anodes as per the agreed design. Impalloy was chosen due to their history of designing and manufacturing high quality anodes at short notice.

The results and benefits

  • After completion of the works, a full written report was issued, accompanied by a video survey of all welds and anode installations.
  • Over 400 stills of the installed system, UT readings of the system weld locations and monopile itself were also issued.

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