Apparatus and method for removing a wall portion from a wall of

Details Apparatus and method for removing a wall portion from a wall of Apparatus and method for removing a wall portion from a wall of

1995-09-01

1996-12-10

Jordan, Charles T.

Induced nuclear reactions: processes, systems, and elements

Handling of fission reactor component structure within...

376211, 376405, G21C 1900

Patent

active

055838987

ABSTRACT:
Apparatus and method for removing a wall portion from a wall of a tubular member. The wall portion has a distal end portion and a proximal end portion. The wall portion is connected to the wall of the tubular member by a pair of ligatures, which remain after use of a suitable cutting tool. The ligatures are aligned and disposed on either side of the wall portion to define a pivot axis. The apparatus has a probe body insertable into the tubular member, which probe body includes an expandable bladder for pushing the distal end portion of the wall portion in order to pivot the wall portion about the ligatures (i.e., about the pivot axis) as the bladder expands. As the wall portion pivots, the distal end portion of the wall portion rotates outwardly from the wall of the tubular member as the proximal end portion of the wall portion rotates inwardly into the tubular member. A movable elongate mandrel engages the proximal end portion of the wall portion. A hydraulic or pneumatic cylinder downwardly moves the mandrel such that the ligatures are severed. The probe body is then removed from the tubular member for removing the severed wall portion from the tubular member. The apparatus may further include an eddy current sensor for locating the wall portion to be removed.

REFERENCES:
patent: 1916556 (1932-06-01), Butt
patent: 4406856 (1983-09-01), Wilkins et al.
patent: 4586249 (1986-05-01), Costlow et al.
patent: 4616392 (1986-10-01), Snyder
patent: 4724595 (1988-02-01), Snyder
patent: 4831702 (1989-05-01), Vossbrinck et al.
patent: 5408883 (1995-04-01), Clark, Jr. et al.

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