دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a reaction in which an element has been changed into an unstable isotope during bombardment by neutrons.

n: organisation that sets guidelines for the testing and use of equipment and materials. Its publications are ASTM Standardisation News, Book of Standards, Cement and Concrete Aggregates Journal, Composites Technology & Research, Geo technical Testing Journal, Journal of Forensic Science, and Journal of Testing and Evaluation. Address: 100 Barr Harbor;West Conshohocken, PA 19428;(610) 832-9500.

n: in pipeline construction, a combination of anchors used to hold a lay barge on station and move it forward along the planned route. Lay-barge anchors may weigh in excess of 20 tons (18 tonnes),and a dozen or more may be needed.

n: a barometer consisting of a flexible, spring-filled metal cell from which air has been removed and a mechanism that registers. See barograph.

n: a gas measurement device that consists of a mutiple-ported Pitot tube installed inside a pipe through which gas is flowing;it is installed perpendicular to the flow of gas. The length of the annubar is equal to the diameter of the pipe in which it is installed. An annubar senses the difference between total flowing pressure and static pressure;gas volume is calculated from this difference. See Pitot tube.

a gas flow rate measurement device using Pitot tubes. Common in pipelines.

a formed metal bar (zinc, aluminum, etc.) attached by electrical wire to a structure to be protected and buried in conductive soil near that structure.

the strike plate over a TCP, drop-bar firing system.

n: Accord with

n: See API barite.