High pressure tapping apparatus

Details High pressure tapping apparatus High pressure tapping apparatus

1994-03-31

1995-08-08

Howell, Daniel W.

Cutting by use of rotating axially moving tool

With control means energized in response to activator...

408101, B23B 4108

Patent

active

054393310

ABSTRACT:
An apparatus for tapping an opening into an existing pipeline that is under internal pressure including an elongated tapping machine body having means on one end for attachment to a pipeline, a boring bar having a rotatable feed screw therein by which the boring bar is axially positioned, and a pressure responsive valve actuated by differential pressure between the interior of a pipeline and the interior of the tapping machine body to control hydraulic pressure inside the tapping machine body to thereby counterbalance the hydraulic force applied to the boring bar.

REFERENCES:
patent: 2679173 (1954-05-01), Will
patent: 3374521 (1968-03-01), Clarke
patent: 3614252 (1972-10-01), Rose et al.
patent: 3703909 (1972-11-01), Erb
patent: 3804545 (1974-04-01), Chistov et al.
patent: 4093393 (1978-06-01), Smith et al.
patent: 4515287 (1985-05-01), Baudoux
patent: 4579484 (1986-04-01), Sullivan
patent: 4626142 (1986-12-01), Brin
patent: 4880028 (1989-11-01), Osburn

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