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Material of flange loose sleeve expansion joint

Flange loose sleeve Expansion joint In the 1970s, it was first used in underground drainage of coal industry in China. Q235 and Q235 are commonly used for TSX double flange expansion joint, and the anticorrosion effect is not very good. Therefore, in the pipeline requiring anti-corrosion treatment, good anti-corrosion treatment should be adopted in the processing process, which can effectively prevent the occurrence of various corrosion phenomena of double flange expansion joint and extend the service life of expansion joint products The pipeline maintenance cost is reduced and the safe and effective operation of the pipeline is ensured.

Method 1: epoxy paint coating for flange loose sleeve expansion joint

It is one of the basic methods of pipeline anti-corrosion to apply the coating uniformly and compactly on the surface of the metal pipeline after rust removal to isolate it from various corrosive media. Since the 1970s, the pipeline has been laid in the harsh environment of polar and marine environment, and the pipeline temperature rises due to the heating and transportation of oil, which puts forward more requirements for the coating performance. Therefore, more and more composite materials or composite structures are used in pipeline anti-corrosion coating. These materials and structures should have good dielectric properties, physical properties, stable chemical properties and wide temperature range.

Method 2: anticorrosive coating on the wall of flange loose sleeve expansion joint

Anti corrosion coating: the film applied to the inner wall of the pipe to prevent corrosion, reduce friction resistance and increase the throughput. The commonly used coatings are amine cured epoxy resin and polyamide epoxy resin, the coating thickness is 0.038 ~ 0.2mm. In order to ensure that the coating is firmly bonded with the pipe wall, surface treatment must be carried out on the inner wall of the pipe. It can also be fixed with pipe clamp support in the whole pipeline, and then add thermal insulation layer to carry out the anti-corrosion effect of the whole pipeline together with the double flange expansion joint pipe layer and pipe wall.

In fact, in various pipeline applications, expansion joints Force transfer joint Telescopic device (expansion joint) and Rubber joint Flexible joint (flexible clamp joint for short) and quick coupling have a common function in pipeline connection, which play an expansion and displacement compensation role for the operation of the pipeline. Because they have this common feature in the pipeline connection, they have the replacement function of complementary and interchangeable expansion joints in the pipeline connection. Only under certain circumstances can a certain kind of joint be selected Model series pipe fitting joint is used. Most of the design units and installation engineering companies choose the above type of pipe joint reasonably according to the location of the pipeline connection, whether the connection is between the sliding pipeline, the pipeline corner and the water pump valve, whether there are fixed buttresses, infinite buttresses and directional limit buttress supports in the pipeline.

The main products of Shanghai Huanjing are expansion joint, loose sleeve expansion joint, flange loose sleeve expansion joint, etc. Most of the design units and installation engineering companies choose the above type of pipe joint reasonably according to the location of the pipeline connection, whether the connection is between the sliding pipeline, the pipeline corner and the water pump valve, whether there are fixed buttresses, infinite buttresses and directional limit buttress supports in the pipeline.

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