High-potential metal seawater pipeline penetration piece with composite structure

Abstract

The invention belongs to the technical field of ship engineering and provides a high-potential metal seawater pipeline penetration piece with a composite structure. The high-potential metal seawater pipeline penetration piece comprises an inner pipe, a flange and a sleeve, wherein the inner pipe and the flange are made of high-potential metal and the sleeve is made of low-potential metal; the inner pipe and the sleeve are concentric pipelines, wherein the inner diameter of the sleeve is larger than the outer diameter of the inner pipe, the sleeve is shorter than the inner pipe, and the sleeve is connected with a low-potential metal ship structure plate; and two ends of the inner pipe are fixedly connected with the concentric flange, and the flange is connected with a high-potential metal pipeline. The high-potential metal seawater pipeline penetration piece is simple in structure and convenient to use, can structurally ensure that a high-conductivity medium can be in simultaneously contact with the high-potential metal and the low-potential metal and thoroughly solves the electrochemical corrosion problem.

Description

technical field [0001] The invention belongs to the field of ship engineering, and in particular relates to a high-potential metal seawater pipeline tank-passing pipe fitting of a composite structure. Background technique [0002] Passage pipe fittings are an important part of the ship's piping system, and they are pipe fittings that run through watertight cabins, decks, tanks, etc. and can maintain their respective seals. The tank fittings are generally composed of inner pipes and connecting surfaces. On the one hand, the inner pipes are connected to the hull pipeline connecting surfaces through the connecting surfaces, and on the other hand, they are directly or indirectly connected to ship structures such as bulkheads. The connecting surfaces can be flanges, threads, etc. In other forms, the inner pipe and connecting surface must ensure that the system medium will not leak. Commonly used tank fittings include copper bushing fittings (CB 539-67) and steel fittings (CB / T ...

AI Technical Summary

Problems solved by technology

When these pipelines pass through the hull structure, if CB / T 3480-92 and other steel inner pipe fittings are used, the seawater will inevitably contact steel and high-potential metals at the same time, and the loops formed by flange bolts and other places will form Macro-corrosion battery, causing corrosion of the steel inner pipe of the tank fittings

If you choose CB 539-67 and other copper inner pipe fittings, due to the contact between the steel and the high-potential metal itself, and the seawater at the flange seal contacts the steel and the high-potential metal at the same time, a macroscopic corrosion cell will be formed, resulting in the passage of the fittings. Corrosion of steel parts

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