Abstract: A method and system for protecting underground gas carrier pipes housed within an outer casing pipe in which a gas carrier pipe section disposed within an outer casing pipe section and having opposed ends is electrically isolated from a remaining gas carrier pipe section proximate each of the ends. An annular space between the gas carrier pipe section and the outer casing pipe section is filled with an electrolyte. At least one anode electrode is inserted into the annular space distal from each of the gas carrier pipe section and the outer casing pipe section and connected with a positive voltage lead of a cathodic protection rectifier. A negative voltage lead of the cathodic protection rectifier is connected to the gas carrier pipe section.

Abstract: Techniques are generally described herein for protecting food or beverage containers (e.g., cans) using impressed current protection. In various embodiments, containers may be received into at least one conductive bed, each bed having a complementary anode. The containers may then be electrically coupled to a first terminal (e.g., negative) of a power supply, and the anode may be electrically coupled to a second terminal (e.g., positive) of the power supply. Resultantly, protective current may be provided to the containers by the anode. Other embodiments may be disclosed and claimed.

Abstract: A marine structure submersible in seawater, such as a hull, which when electrically activated is then resistant to fouling by marine organisms. The hull is formed by a structural laminate having a core sandwiched between inner and outer skins. The outer skin which forms the exposed surface of the hull is coated with a metallic paint defining a cathodic electrode. The core is constituted by balsa wood or foam plastic modules attached to an open-mesh scrim that includes conductive fibers to create an electrical grid defining an anodic electrode that is embedded in the laminate. Impressed across the electrodes is a direct voltage to establish an electric field causing marine organisms which seek to foul the hull surface to migrate away from this surface. Alternatively, the cathodic electrode may be formed by an open-mesh scrim defining an electrical grid interposed between the core and the outer skin.

Abstract: Impressed current anodes such as cathodic protection anodes comprise iron based alloys including less than 70% iron and less than 0.1% carbon. Additional components may include molybdenum, chromium, nickel and others. The iron based alloy may itself comprises the anode or it may provide a substrate to which an electrolytic coating is applied.

Abstract: A elongate electrode of an impressed current protection system comprises a polymeric jacket sleeve (10) that contains a particulate carbonrich filler (12) around a central elongate conductive core (4,6). The invention provides a method of repairing such an electrode that has a damaged jacket section (14), and involves securing the jacket (14) to the core (4,6) on each side of the damaged section (14), which can then be removed together with the associated filler (12). A wraparound repair sleeve (18, 20, FIG. 3) is secured to the jacket (10) on each side of the damaged section (14) and filled with a carbon-rich particulate filler (12) effect the repair.

Abstract: A method for electric protection of a metal object, in which a long-line grounding electrode is installed in an electrolytic medium at a preset distance from the metal object to be protected and the metal object and the long-line grounding electrode are electrically connected to a current source to form a protection circuit, the metal object is polarized, while the sections of the electric connection and the geometric dimensions and/or electric parameters of the grounding electrode are so selected that the value of the current propagation constant in the protection circuit is less than or equal to 10.sup.-3 m.sup.-1. The grounding electrode has an extended central flexible metal conductor (18), an adhesive layer (20) providing an electric contect, and an envelope (19) of a slightly soluble current-conductive material based on a composition including a carbon-containing filler in an amount of 40-80 wt. %, a rubber-base polymer in an amount of 10-49.8 wt. %, a plasticizer in an amount of 9-10 wt.