Metal working – Method of mechanical manufacture – Heat exchanger or boiler making
Patent
1995-01-05
1997-07-08
Cuda, Irene
Metal working
Method of mechanical manufacture
Heat exchanger or boiler making
29890044, B23P 1500
Patent
active
056448422
ABSTRACT:
A method is disclosed for producing heat exchange tubing for use in tube and shell heat exchangers hag proved heat exchange and proved fluid flow around the heat exchange tubes in which cylindrical tubing is deformed by pressure rollers to produce tubes having cylindrical ends and intermediate potions of elliptical cross section. These tubes may also be bent to U-shaped heat exchange tubes. The cylindrical end portions on one end are secured in a tube sheet, and the elliptical intermediate portions extend through baffle plates having openings sized according to TEMA standards. The assembly is secured a shell having inlet and outlet openings on the same side or opposite sides of the shell and a second be sheet fitted over the other cylindrical ends of the heat exchange tubes, dished headers are secured over each of the tube sheets providing an inlet/outlet header at one end and a fluid return header at the other end. In another embodiment, the heat exchange tubes have cylindrical ends and a first intermediate portion deformed by pressure rollers to a first elliptical cross section and a second intermediate portion deformed by pressure rollers to a second elliptical cross section having its major axis at a substantial angle to the major axis of the first elliptical cross section, the assembly is placed inside a shell having inlet an outlet openings spaced apart on the shell and aligned with the major axes of the respective elliptical sections.
REFERENCES:
patent: 3196657 (1965-07-01), Fromson
patent: 4031745 (1977-06-01), McCarty
patent: 4546824 (1985-10-01), Melnyk
patent: 4744505 (1988-05-01), Calleson
patent: 5099576 (1992-03-01), Shinmura
patent: 5214848 (1993-06-01), Lelieure
Cuda Irene
Mosely Neal J.
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