Metal working – Means to assemble or disassemble – Heat exchanger
Patent
1991-08-16
1992-12-08
Cuda, Irene
Metal working
Means to assemble or disassemble
Heat exchanger
269 481, B23P 1904
Patent
active
051686236
ABSTRACT:
A tube puller tool assembly for extracting tubes from a tubesheet of heat exchangers. The tool assembly includes an actuator cylinder unit attached to a guide cylinder, having a piston rod attached to a tapered mandrel for expanding multiple fingers of a collet member firmly against the tube inner surface. The collet is initially urged into contact with the tapered mandrel surface by a compression spring provided between the piston rod and collet member, except forward movement of the collet relative to the mandel is limited by a retainer ring in the guide cylinder. In use, the tool assembly is first pressurized to place the collet and mandrel members in an extended forward position, then the tool is inserted into a tube to be pulled, with a guide cylinder being abuted against the tubesheet. The tool is then pressurized to retract the piston and mandrel and thereby radially expand the collet fingers firmly into the tube. Increased actuator cylinder pressure results in withdrawal of the tube from the tubesheet. The actuator cylinder is then depressurized, the withdrawn tube is removed from the tool, and the procedure is repeated for each tube being pulled.
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patent: 4959899 (1990-10-01), Martin
Cuda Irene
Foster Wheeler Energy Corporation
Naigur Marvin A.
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