Preparation method of inner lining of steel pipe elbow

Abstract

The invention discloses a method for preparing the inner lining of a steel pipe elbow. The steel pipe elbow includes an elbow body and elbow flanges arranged at both ends of the elbow body. The preparation method includes the steps of: rubber inner mold pipe installation , powder filling, pressurization and shaping, filler filling, sintering, filler pouring out, when using the preparation method of the present invention to prepare the steel pipe elbow lining, pour pressurized liquid into the cavity of the rubber inner mold tube The powder raw material is pressurized and shaped. During the pressurized and shaped process, the rubber inner mold tube can undergo a certain deformation under the action of pressure, so that the powder raw material is pressed more tightly. Because the rubber inner mold tube has the ability to undergo elastic deformation, it can be taken out again. In the process of rubber inner mold tube, it is not easy to cause damage to the steel pipe elbow and its internal raw materials. During the sintering process, the filler is used to support the raw material, so that the forming effect of the inner lining is good; and the pressurized fluid and filler can be reused, and the inner lining The preparation cost is low.

Description

technical field [0001] The invention relates to an anticorrosion process for a large elbow, in particular to a preparation method for the inner lining of a steel pipe elbow. Background technique [0002] Installing a protective layer inside the pipeline is beneficial to pipeline anticorrosion. The protective layer preparation methods for straight pipes usually include coating and lining. However, for steel pipe elbows, the technical difficulty of preparing the protective layer is high. Most of the stainless steel elbows are used, not only the price is high, but also the anti-corrosion performance is relatively poor. [0003] For large steel pipe elbows used for oil well exploitation and crude oil transportation, the radius of the centerline of the elbow often reaches more than one meter, or even several meters. If the protective layer inside the pipe is formed by coating, on the one hand, the coating area is large and the coating It takes a long time. On the other hand, it ...

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Problems solved by technology

[0002] Installing a protective layer inside the pipeline is beneficial to pipeline anticorrosion. The protective layer preparation methods for straight pipes usually include coating and lining. However, for steel pipe elbows, the technical difficulty of preparing the protective layer is high. Stainless steel elbows are mostly used, not only the price is high, but also the anti-corrosion performance is relatively poor

[0003] For large steel pipe elbows used for oil well exploitation and crude oil transportation, the radius of the centerline of the elbow often reaches more than one meter, or even several meters. If the protective layer inside the pipe is formed by coating, on the one hand, the coating area is large and the coating It takes a long time. On the other hand, it is difficult to coat the inside of the elbow evenly, and the operation is difficult; while some existing steel pipe elbows are usually equipped with an inner mold when the lining is prepared. Inside the steel pipe elbow, and fill the gap between the inner mold and the steel pipe elbow with lining materials to prepare the inner lining. After the inner lining is shaped, pull out the inner mold. Reliable shaping. The inner mold is usually made of hard materials such as steel. When the curvature of the elbow is large, it is not easy to remove the inner mold from the elbow, and it is easy to scratch the inner lining during the removal process, and even scratch the inner wall of the steel pipe, affecting Anti-corrosion properties

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