دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

straight or branched chain chemicals with some double bonds between carbons.

n: A kind of double core barrel drill. The top of inner barrel is hung by ball bearing. It is good for improvement of core recovery if inner barrel does not roll with outer barrel.

n: a high-integrity valve with double seals and with provision for determining whether either seal leaks.

n: trade name for appratus for cleaning and freeing oil tanks of gas by means of high-pressure jets of hot water. It consistes essentially of opposed double nozzles, which rotate slowly about their horizontal and vertical axes and project two streams of hot water at a pressure of 175 psi (1,206 kilo pascals) against all inside surfaces of the deck, bulkheads, and shell plating.

n: the lower deck of a doubledecked semisubmersible drilling rig. See milin deck, Texas deck.

n: a mechanical drive using a driving chain and chain gears to transmit power. Power transmissions use a roller chain, in which each link is made of side bars, transverse pins, and rollers on the pins. A double roller chain is made of two connected rows of links, a triple roller chain of three, and so forth. chain guard n: in a chain-and-sprocket drive, a case that protects workers from the moving drive. It also protects die drive from dirt and is part of the cooling and lubrication systems. Some enclose only one drive and some enclose several drives. May be made of sheet metal or plate metal. Heavier guards also support the shafts on bearings. Both types have access panels for inspection and maintenance.

n: a very short piece of pipe threaded its entire length.

n: A piece of nipple which is bited with thread in full length. Used for double flange device to adjust the distance between flanges.

n: Using double core barrel drill to break the annular stone at bottom and keep the central cylindrical core. Cut it down and hoist it to the surface when the length satisfies requirement.

n: The whole set of coring tool consisted by outer barrel, inner barrel, safe joint, rotating bearing and core bit.

n: See double joint.