دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: the maximum voltage or current in a cycle of an AC circuit.

a stream that transverses relatively flat land, ultimately creating different channels in response to floods and sediment build up.

n: the discrepancy between the result of the measurement and the value of the quantity measured.

n: (MWD) 1. directional and other surveying during routine drilling operations to determine the angle and direction by which the wellbore deviates from the vertical. 2. any system of measuring downhole conditions during routine drilling operations.

n: a mothod of measuring parameters downhole and sending the results to surface without interrupting routine drilling operations.a special tool containing sensors,power supply and transmitter is installed as part of BHA (q.v.).the information is transmitted

downhole logging while drilling. “Logging While Drilling” is one form of measurement while drilling" - to differentiate it from mud logging, wireline logging, etc. See Logging While Drilling.

A strainer type filter that is specifically for removal of larger particles in a liquid stream.

n: formed by driving and distribution, the dirving type contains of cardan shaft, reducer casing, clutch coupling, vee belt, forward drive box, revert drive box , drive chain and shaft.

n: the process of obtaining baseline physicals for employees involved in emergency response or hazardous waste cleanup and monitoring their health at specified intervals. Under HAZWOPER, medical surveillance is applied to members of organised HAZMAT teams and hazardous materials specialists and any emergency response employee who exhibits signs or symptoms of exposure, or wears a respirator for thirty days or more a year, or is exposed to hazardous substances at or above the permissible exposure limits. A 200-mesh screen with a wire diameter of 0.0021 inch (0.0533 millimetre) has an opening of 0.074 millimetre, or will pass a particle of 74 microns. See micron.

n: (mp) the temperature at which the solid and liquid states of a substance coexist in equilibrium. The melting point temperature of a substance is usually determined at normal atmospheric pressure.

n: in an engine, a fuel filter that consists of several very thin metal discs stacked inside a housing. As fuel flows through the strainer, foreign matter in the fuel is trapped by the very small spaces between the discs.

n: a rock derived from preexisting rocks by mineralogical, chemical, and structural alterations caused by heat and pressure within the earths crust. Marble is a metamorphic rock.