Metal working – Means to assemble or disassemble – Heat exchanger
Patent
1994-02-07
1996-01-02
Cuda, Irene
Metal working
Means to assemble or disassemble
Heat exchanger
29235, 29725, 29890044, B23P 1500
Patent
active
054796997
ABSTRACT:
Apparatus for expanding tubular members, such as U-shaped heat transfer tubes having ends thereof located in the confined space adjacent the curved sides of the bowl-shaped lower plenum of a typical nuclear steam generator. The apparatus includes an elongate mandrel having a flow channel therethrough in communication with a resilient tubular bladder surrounding the mandrel. The bladder is flexible about its longitudinal axis due to the ribbed construction of the wall thereof. The mandrel includes a plurality of segments, adjacent ones of the segments interconnected by a ball-and-socket joint therebetween, so that the segments swivel about respective ones of the ball-and-socket joints. In this manner, the mandrel flexes as it is inserted into the tube end located in the confined space defined by the sides of the bowl-shaped lower plenum of the steam generator. The mandrel also flexes as it traverses the upper U-bend portion of the tube. Thus, the mandrel and the expandable bladder connected thereto are flexible rather than rigid in order to be easily inserted into the tube ends located adjacent the curved sides of the bowl-shaped plenum and in order to easily traverse the upper U-bend portion of the tube. A pressurizer supplies pressurized fluid to the channel to controllably expand the bladder into intimate engagement with the tube in order to radially expand the tube. The mandrel is also capable of similarly expanding repair sleeves disposed concentrically in the tube.
REFERENCES:
patent: 1530381 (1923-05-01), Leedom
patent: 4716753 (1988-01-01), Martin
patent: 4724595 (1988-02-01), Synder
patent: 4876871 (1989-10-01), Arzenti et al.
patent: 5062199 (1991-11-01), Kelly
patent: 5167064 (1992-12-01), Sutor, IV
patent: 5201118 (1993-04-01), McParland
patent: 5301424 (1994-04-01), Snyder
Cuda Irene
Stevens Walter S.
Westinghouse Electric Corporation
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