Abstract: A tubular coupling for metal pipes has a flange, a tubular element inserted in the flange and having one end connectable to a pipeline and another end and a ring-shaped insulating element arranged at the other end of the tubular element between the tubular element and the flange.

Abstract: An indissoluble anode for dissipating current for electrochemical plants of underground or underwater structures, the anode comprises a core having a high resistance to radial crushing and bending, and a layer of titanium and applied over the core and has a free surface. A thin film of an indissoluble and current-dissipating metal is applied on the free surface of the titanium layer.

Abstract: A tubular coupling for metal pipes has a flange, a tubular element inserted in the flange and having one end connectable to a pipeline and another end and a ring-shaped insulating element arranged at the other end of the tubular element between the tubular element and the flange.

Abstract: An anode for the cathodic protection of a metallic structure subject to corrosion includes a strip or band of aluminum, zinc, magnesium or alloys thereof. The strip or band is anodic to the metallic structure and has a surface which is adapted to face the metallic structure. This surface of the strip or band is provided with a layer of electrically conductive adhesive so as to permit the strip or band to be adhesively secured to the metallic structure and to be in electrical communication therewith. In this manner, metallic structures of any arbitrary configuration may be cathodically protected under all corrosive conditions.

Abstract: The corrosion-prevention system comprises a metallic conduit having an exterior surface subjected to the corrosive effects of a surrounding ambient wetted environment, and an interior surface subjected to the corrosive effects of fluids conveyed within the conduit. First cathodic protection means completes a first electrolytic path with the corrosively-wetted environment serving as the electrolyte, thereby cathodically protecting the exterior surface. Second cathodic protection means protects the interior surface and includes a plurality of inert anodes electrically connected to cathodic plate means which are located exteriorly of the conduit so as to intercept the flow of current in said first electrolytic path and conduct the current to the inert anodes and complete a second electrolytic path through the corrosive fluids conveyed within said conduit.