Pressure balanced subsea tapping machine

Details Pressure balanced subsea tapping machine Pressure balanced subsea tapping machine

1998-10-30

2000-01-11

Howell, Daniel W.

Cutting by use of rotating axially moving tool

Processes

Bit detachable

137 15, 137318, 408 87, 408241R, 408710, B23B 3500, B23B 4108

Patent

active

06012878&

ABSTRACT:
A machine for use underwater and therefor subject to ambient hydrostatic pressure for tapping a pressurized pipeline has an elongated tubular tapping machine body with a boring bar therein that receives a cutter at its lower end. A passageway in a lower end portion of the tapping machine body senses the internal pressure of a pipeline after the pipeline is penetrated by the cutter, the passageway being connected to a pressure equalizer having communication with the interior of the tapping machine body to thereby balance hydraulic forces applied to the boring bar during a tapping operation. The machine has a gear case affixed to the tapping machine body to actuate the boring bar, the tapping machine body being sealed from the gear case, and including a fluid isolating equalizer supported to the tapping machine body and having a first communication with the interior of the gear box and a second communication with ambient hydrostatic pressure to thereby at least substantially equalize pressure in the gear box with the ambient hydrostatic pressure.

REFERENCES:
patent: 884565 (1908-04-01), Bryan
patent: 2840166 (1958-06-01), Eckel et al.
patent: 3614252 (1971-10-01), Rose et al.
patent: 4579484 (1986-04-01), Sullivan
patent: 5439331 (1995-08-01), Andrew et al.

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