Metal working – Means to assemble or disassemble – Heat exchanger
Patent
1991-01-03
1991-11-05
Cuda, Irene
Metal working
Means to assemble or disassemble
Heat exchanger
2940209, 29523, 29890031, 29890036, B23P 1526
Patent
active
050621998
ABSTRACT:
A method and apparatus for radially expanding and anchoring a sleeve within a tube are provided. The apparatus includes a hydraulic expanding mandrel, a fluid source for supplying a first pressurized fluid and a second fluid to first and second pumps and a fluid control mechanism for selectively activating the second pump and for controlling the total volume of pressurized fluid discharged by the second pump. In order to radially expand and anchor the sleeve within the tube, the sleeve is first inserted within the tube. Then, the mandrel is inserted within the sleeve such that the mandrel and sleeve together define a substantially annular hydraulic pressure zone situated between the sleeve, the body of the mandrel and the seals. Thereafter, a first supply of pressurized fluid, which can be pressurized by the first pump, is introduced into the pressure zone through the passage until the first supply reaches a predetermined pressure is reached which is above the radial yield point of the sleeve but below the aforementioned aggregate yield point. Then, a predetermined aggregate volume of a second supply of pressurized fluid, which can be pressurized by the second pump as controlled by the fluid control mechanism, is introduced into the pressure zone through the passage at a maximum predetermined pressure which is above the aforementioned aggregate yield point.
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Cuda Irene
Haskel, Inc.
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