Tap:

A tool for forming an internal screw thread.

It consists of a hardened tool-steel male screw grooved longitudinally so as to have cutting edges.

2.

A hole or opening in a line or vessel into which a gauge or valve may be inserted and screwed tight.

v.1.

To form a female thread by means of a tap.

2.

Extract or cause to flow by means of a borehole, e.g., to tape a reservoir.

Terms Related to Tap

• Bushing

  1. A pipe fitting on which the external thread is larger than the internal thread to allow two pipes of different sizes to be connected. ...

• Stuffing box

  A device that prevents leakage along a piston, rod, propeller shaft, or other moving part that passes through a hole in a cylinder or vessel. ...

• Sub

  A short, threaded piece of pipe used to adapt parts of the drilling string that cannot otherwise be screwed together because of differences in thread ...

• Tool joint

  A heavy coupling element for drill pipe. It is made of special ahoy steel and has coarse, tapered threads and seating shoulders designed to sustain ...

• Casing

  1. Steel pipe placed in an oil or gas well as drilling progresses to prevent the wall of the hole from caving in during drilling, ...

• Pig

  1. A flow line clearing device, pumped through the line with normal flow. 2. A scraping tool that is forced through a pipeline or flow ...

• Thread protector.

  A metal or plastic device that is screwed onto or into pipe threads to protect 5them from damage when the pipe is not in use.