Apparatus for tapping a hole in a pipeline

摘要: Apparatus for tapping a hole in pipeline adapted to be attached support assembly having sealed communication with the exterior of and machine body boring bar rotatably supported therein circular cutter at lower end thereof, feed screw by axially positioning bar, hydraulically powered drive within driving an auxiliary shaft affixed rotate extending exteriorly receive supplementary mechanical rotary energy rotation so can retracted if hydraulic power is lost. A pressure compensation system permits apparatus operated subsea environment. position indicating location read out remote location, such as on ocean's surface improved coupon retainer provided.