Pipe and pipe sheet expanded connection 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 are mainly connected by welding, expansion joints, expansion-welding joints, visco-expansion and threaded connections. The failure parts of these shell-and-tube equipment manufacturing processes are mainly 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 expansion-welding combinations...

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

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.

⑤ Labor productivity is low, and the expansion of small diameter or thick wall pipes is difficult, and repeated expansion is also difficult

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

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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