Metal working – Means to assemble or disassemble – Puller or pusher means – contained force multiplying operator
Patent
1986-02-24
1987-09-22
Goldberg, Howard N.
Metal working
Means to assemble or disassemble
Puller or pusher means, contained force multiplying operator
291573R, 2940208, 2940213, 29DIG48, 138 97, 165 76, B21D 5300, F28F 700, F16L 5518
Patent
active
046945490
ABSTRACT:
A method for remotely removing and replacing defective tube ends of heat exchanger tubes located adjacent a tubesheet. In the method, a rotary cutting tool is inserted into each defective tube and the tube end portion is cut at a location near the tubesheet, a weld joint between the tube and tubesheet is removed, and the defective tube is then withdrawn through the tubesheet opening. Next, the resulting exposed end of the existing tube is remotely machined using a special rotary cutting tool, then a new replacement tube is inserted through the tubesheet opening and positioned in axial alignment and interfitting engagement with the end of the existing tube, after which the rear end of the new tube is expanded firmly against the tubesheet opening. The front or inner end of the replacement tube is then expanded firmly against the inner surface of the existing tube end, in preparation for welding these tubes together. Then, the new tube is welded to the existing tube and to the tube sheet to provide pressure-tight joints and complete the replacement tube installation.
REFERENCES:
patent: 4347652 (1982-09-01), Cooper, Jr. et al.
patent: 4576546 (1986-03-01), Cooper, Jr. et al.
patent: 4615477 (1986-10-01), Spada et al.
Foster Wheeler Energy Corporation
Goldberg Howard N.
Naigur Marvin A.
Smolowitz Martin
Wallace Ronald S.
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