Special-shaped ship metal pipe system connecting corrosion prevention structure and construction method

Abstract

The invention discloses a special-shaped ship metal pipe system connecting corrosion prevention structure. The structure comprises bolts (1) which are arranged on the peripheries of connectors of special-shaped metal pipe system flanges (7) and nuts (5) which are matched with the bolts (1). Composite electric insulation spacers (3) are arranged between the connectors of the flanges (7). The periphery of each bolt (1) is sleeved with a protective tube (4). Composite electric insulation washers (2) are arranged between the flanges (7) and the nuts (2). The invention further discloses a construction method of the prevention structure. By adoption of the special-shaped ship metal pipe system connecting corrosion prevention structure, the composite electric insulation spacers are used for isolating the pipe system butt flange face from fasteners, electronic channels generated through special-shaped metal contact are cut off, the inner walls and the outer walls of pipelines within a certainrange of a connecting structure and the two ends of the structure are coated with insulation enameled paint, the resistance of seawater in pipe systems at the two ends of a special-shaped metal jointis increased, ion channels in the seawater are cut off, and a good electric insulation effect can be achieved.

Description

technical field [0001] The invention belongs to the technical field of electrochemical corrosion protection, and more specifically relates to a corrosion protection structure and construction method for connecting dissimilar metal piping systems of a ship. Background technique [0002] Ship hulls, equipment, piping and other system components are made of different metals, mainly including carbon steel, low alloy steel, stainless steel, copper and copper alloy, titanium alloy and other materials. The connection between structures or systems sometimes inevitably involves the contact of dissimilar metals. If the protection treatment is not in place, the direct contact of dissimilar metals will form a "primary battery". In seawater or humid environments, the "primary battery" circuit is connected At this time, the metal with a lower potential (anode component) supplies electrons to the metal with a higher potential (cathode component), resulting in accelerated corrosion of the m...

AI Technical Summary

Problems solved by technology

At present, relevant domestic repair and shipyards have taken certain protective measures against the corrosion of dissimilar metal piping connections in ships, but due to incomplete insulation measures, the actual protective effect is not obvious

The problems existing in the existing dissimilar metal protection construction methods are: (1) the electrical insulation gasket made of a single material or the common asbestos sealing gasket is used to isolate the dissimilar metal flange, and the electrical insulation effect is not good; (2) the relevant pipelines There is no insulating paint on the inner and outer sides, which cannot effectively block the ion channel between the seawater of the dissimilar metal flange pipeline; (3) In the existing process, the insulating sleeve or bushing is not filled with insulating glue, and the ends of the fasteners are not completely sealed. Coating insulating sealant; (4) Insufficient corrosion protection of dissimilar metals for full-life components such as hull structures and main pipelines

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