F - Mech Eng,Light,Heat,Weapons – 22 – B
Patent
F - Mech Eng,Light,Heat,Weapons
22
B
26/50
F22B 37/00 (2006.01) B23B 51/04 (2006.01) F28F 11/02 (2006.01)
Patent
CA 1261598
ABSTRACT OF THE DISCLOSURE A device for removing plugs from plugged tubes in a steam generator including a frame having a substan- tially flat plate, with a hollow drill bit mounted thereon and movable generally perpendicularly with respect thereto from a storage position to an operating position. An elongated retaining pin extends through the hollow drill bit and therebeyond having threads on one end thereof for attachment to the plug to be drilled. Actuating means moves the drill bit between the storage position thereof and the operating position thereof, motor means is mounted on the frame for rotating the drill bit. An air-water mixture is introduced near where the drill bit meets the plug to be drilled, the water being present in an amount of about one-half volume percent, and a vacuum is used to collect and remove the air-water mixture and any debris entrained therewith due to drilling the associated plug.
475278
Choby Edward J.
Hawkins Phillip J.
Oldham And Company
Westinghouse Electric Corporation
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