دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: 1. 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. to extract or cause to flow by means of a bore- hole, e.g., to tap a reservoir.

a valve on a line.