Metal working – Method of mechanical manufacture – Heat exchanger or boiler making
Patent
1995-02-13
1997-09-09
Hughes, S. Thomas
Metal working
Method of mechanical manufacture
Heat exchanger or boiler making
29727, 294266, 2940203, 165 76, 138 89, B23P 1526
Patent
active
056643284
ABSTRACT:
A method of removing a metal plug from a conduit includes the steps of simultaneously applying a static pull force and repetitive impulses to the plug. The method is particularly suited to removing a plug from a heat exchanger tube in a nuclear powered steam generator. A tool for practicing the method on such plugs includes a first hydraulic actuator for first moving an expansion member out of engagement with an interior plug wall, a second hydraulic actuator capable of attachment to the plug for applying a static pull force to the plug, and an arrangement connecting an air impact tool to the second hydraulic actuator for applying, simultaneously with the static force, high-frequency impulses to the plug entirely through solid members.
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Boone Paul J.
Costlow Annette M.
Everett James W.
Fink David J.
Roberts James J.
Butler Marc W.
Hughes S. Thomas
Westinghouse Electric Corporation
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