Method of removing plugs

Details Method of removing plugs Method of removing plugs

1987-12-07

1989-01-31

Echols, P. W.

Metal working

Means to assemble or disassemble

Puller or pusher means, contained force multiplying operator

2940203, 294264, 294266, 29727, B21D 5302

Patent

active

048006378

ABSTRACT:
A mechanical plug (20) having internal threads (24) and displaceable cone (30) for expanding the plug into secure engagement with a steam generator tube (14) is removed by a method which includes the step of moving the cone (30) upwardly within an internal cavity (22) along tapered surface (26), stretching the plug and thereby reducing its diameter by means of a tube stretcher 40 having an internally and externally threaded adapter (42), a bolt-like expander (50) and a force pad (52), and, pulling the plug from the tube.

REFERENCES:
patent: 4581801 (1986-04-01), Kobuck et al.
patent: 4646816 (1987-03-01), Rothstein
patent: 4679315 (1987-07-01), Overbay
patent: 4696102 (1987-09-01), Overbay
patent: 4734972 (1988-04-01), Hawkins
patent: 4754538 (1988-07-01), Stewart, Jr. et al.

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