Method of replacing a tube on a straight-tube heat exchanger

Details Method of replacing a tube on a straight-tube heat exchanger Method of replacing a tube on a straight-tube heat exchanger

1991-09-19

1993-04-27

Coda, Irene

Metal working

Method of mechanical manufacture

Heat exchanger or boiler making

29890043, 294264, 228183, B23P 1526

Patent

active

052050386

ABSTRACT:
A transverse cut (18, 19) is made on a heat exchanger tube (4) to be replaced in the vicinity of its connectors (14, 15), at each end. A cut (19') is made in the frustoconical zone (16') of connection of the tube (4) to the second connector (15). The cutting operations are effected from inside the tube (4) and through one of the tube plates (2, 3). The tube (4) to be replaced is extracted from the heat exchanger through the interior of the second connector (15) and the corresponding opening (13) in the second tube plate (3). A replacement tube is introduced into the heat exchanger through the opening (13) in the second tube plate (3) until a first end of the tube engaged in the heat exchanger reaches the level of the cut zone (18) of the first connector (14). The first end of the tube is welded on the first connector (14). The length of the replacement tube is adjusted so that its second end can be engaged in the second connector (15) over a predetermined length, and the second end of the replacement tube is joined by an overhang weld inside the second connector (15).

REFERENCES:
patent: 2996600 (1961-08-01), Gardner et al.
patent: 3962767 (1976-06-01), Byerley et al.
patent: 4694549 (1987-09-01), Rabe
patent: 4943001 (1990-07-01), Meyer
Patent abstracts of Japan-vol. 4 No. 7 (C-070) Oct. 19, 1980.
Patent abstracts of Japan-vol. 13 No. 194 (M-823) (3542) May 10, 1989.

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