دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: an instrument for measuring wind speed in the atmosphere. The most common types are cup, vane, and hot-wire anemometers.

the weak section of soft rock in the upper mantle just below the lithosphere. It is involved in plate movement. Depth is 70 to 100 km below the surface.

abbr: atmosphere.

n: See atmosphere degasser.

(atm) n: a unit of pressure equal to the atmospheric pressure at sea level, 14.7 pounds per square inch (101.325 kilopascals)

n: The knockout drum that removes the gas invading into the drilling fluid inatmosphere pressure.

n pi: total pressure at a depth underwater, expressed as multiples of normal atmospheric pressure.

n: the pressure exerted by the weight of the atmosphere. At sea level, the pressure is approximately 14.7 pounds per square inch (101.325 kilopascals),often referred to as 1 atmosphere. Also called barometric pressure.

n: a device used to restrict fluid flow to one direction. It consists of a polished sphere, or ball, usually of metal, and an annular piece, the seat, ground and polished to form a seal with the surface of the ball. Gravitational force or the force of a spring holds the ball against the seat. flow in the direction of the force is pre- vented, while flow in the opposite direction overcomes the force and unseats the ball.

n: a bearing in which a finely machined shaft (a journal) turns on freely rotating hardened-steel spheres that roll easily within a groove or track (a race) and thus convert sliding friction into rolling friction. See ball race.

n: Composed by a set of hardened ball, inside race and outside race. Because the ball can roll flexibly in the race, the bearing journal can revolve freely in the bearing.