Imi Marston Limited

Marston Excelsior Limited

Global Cathodic Protection, Ltd.

Michael A Warne

Peter C Hayfield

Apparatus for use in determining electric potentials underwater includes Luggin tubes of small diameter which are open to the water at outer ends thereof. The outer ends are arranged at known spaced positions relative to one another. The potentials at the ends of the tubes are connected selectively via fluid in the tubes to a reference electrode. The potential at the reference electrode relative to a further electrode is measured.

Apparatus for determining underwater potential differences employing

A cathodic protection anode incorporating a latticework anode of increased strength.

Anode for cathodic protection system

The invention provides a submergeable structure provided with cathodic protection means comprising a flexible impressed current anode assembly including at least one elongate electrode wound around a rope and lying in the depressions between the strands of the rope to provide an anodic region and rope extensions extending from the anodic region in at least two different directions, said extensions being secured to the structure so as to space the anodic region from metal of the structure to be protected. In addition, the invention includes an impressed current anode assembly suitable for use as the above defined cathodic protection means and having an anodic region comprising an elongate electrode wound around an insulating rope which passes through the anodic region and extends therefrom in at least two different directions. A particularly useful anode assembly in accordance with the invention includes platinized titanium or niobium wire (preferably copper-cored) for the electrode(s) helically wound around a rope of polyester or polypropylene. Regardless of the structure of the anode assembly, a plurality of assemblies in accordance with the invention may be assembled using a harness system to provide an impressed current anode system for cathodic protection of a submerged structure. The invention also relates to a new design of reference electrode which may be used with the anode assembly of the invention. The invention has particular utility in cathodic protection of oil rigs.

Current rope anodes

A method of carrying out an electrolytic process utilizing an electrode formed of a film-forming metal having applied thereto coatings of a precious metal compound capable of decomposing upon heating, said compound being decomposed by heating, and a further layer of precious metal electroplated on to said fired compound layer.

Electrolytic process employing electrodes having coatings which comprise

A titanium or niobium cathodic protection anode component comprising a strip of metal roll formed to have, in cross-section, a U-shaped portion with a pair of arms extending from the free edges of the U-shaped portion there being a layer of platinum on the convex surface of the spine of the strip, and systems incorporating such anodes.

Growing community of inventors

Brewood, United Kingdom

Michael A Warne