Cutting by use of rotating axially moving tool – With work-engaging structure other than tool or tool-support – Having tool-opposing – work-engaging surface
Patent
1996-01-23
1997-04-08
Howell, Daniel W.
Cutting by use of rotating axially moving tool
With work-engaging structure other than tool or tool-support
Having tool-opposing, work-engaging surface
137318, 137320, 141 51, 141 65, B23B 4108
Patent
active
056181370
ABSTRACT:
A tapping assembly comprising a main valve for selectively opening and closing a valve passageway, a support for holding the main valve adjacent a unit to be tapped, a drill for piercing a wall of that unit with the drill including a housing and a cutting element. A coupler is provided with left-hand threads and right-hand threads for easily connecting and disconnecting the drill housing from the main valve, thereby allowing easy replacement of a drill bit. Vents are provided both upstream and downstream of the main valve for permitting controlled removal of the contents of the unit with the main valve closed and for permitting controlled removal of any contents of the unit from the coupler with the main valve closed.
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"Procedures For Welding Or Hot Tapping On Equipment Containing Flammables", American Petroleum Institute, Publication 2201, Third Edition, Oct. 1985.
Hawley Alan M.
Mattern Charles C.
Earth Resources Corporation
Howell Daniel W.
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