Tube tube sheet expansion joint method

Abstract

The invention discloses a pipe and pipe sheet expanded connection method which includes the steps: (1) assembling a pipe and a pipe sheet; (2) adjusting expanded connection pressure and pressure maintaining time; (3) connecting a joint of the pipe and the pipe sheet in an expanded manner. By the expanded connection method, stress corrosion resistance and seismic resistance of the joint of the pipe and the pipe sheet can be improved, expanded connection pressure is uniform, expanded connection quality is stable, operation is rapid, simple and convenient, and expanded connection is efficient.

Description

technical field [0001] The invention relates to a tube-tube-sheet expansion joint method, which belongs to the field of machinery. Background technique [0002] In the manufacturing process of shell-and-tube heat exchangers, the tube-tube-sheet joints mainly adopt connection methods such as welding, expansion joint, expansion welding combination, visco-expansion and threaded connection. The parts where the manufacturing process of these shell-and-tube equipment fails are mainly the tube- The quality of the tube-sheet connection joint determines the reliability and service life of the shell-and-tube heat exchanger, which may cause huge economic losses to industrial production. Therefore, the reliability of the tube-tubesheet connection joint is an important issue in the design and manufacture of heat exchange equipment. [0003] In the manufacturing process of shell-and-tube heat exchangers, the tube-tube-sheet joints are mainly connected by welding, expansion joints, and ex...

AI Technical Summary

Problems solved by technology

However, mechanical expansion joints have the following disadvantages: ①The connection strength and compactness of each joint are not uniform

②The tendency of pipe end stress corrosion is obvious

④ There are certain restrictions on the compatibility of expansion joints between tubes and tubesheet materials, such as the expansion joints between titanium tubes and carbon steel, and the expansion joints between aluminum tubes and carbon steel, etc.

⑤The labor productivity is low, and it is difficult to expand the small diameter or thick-walled pipes, and it is also difficult to repeat the expansion

However, rubber expansion joints also have some shortcomings: ①The expansion pressure is unevenly distributed along the axial direction

②The service life of the sealing rings at both ends and the rubber elastic body is greatly different

③ Full thickness expansion cannot be realized

However, the flexible static pressure expansion joint of tube-tubesheet is a complex contact process, which has different behavior characteristics from traditional expansion joints.

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