دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: pressure exceeding or falling below the pressure to be expected at a given depth. Normal pressure increases approximately 0.465 pow1ds per square inch per foot of depth or 10.5 kilopascals per metre of depth. Thus, normal pressure at 1,000 feet is 465 pounds per square inch;at 1,000 metres it is 10,500 kilopascals. See pressure gradient.

n: A formation pressure that deviates from the normal formation fluid hydrostatic pressure. Such pressure may be classified as "subnormal" (lower than normal) or "overpressured" (higher than normal).

(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 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: the temperature at which the vapour pressure of a liquid becomes equal to the pressure exerted on the liquid by the surrounding atmosphere. The boiling point of water is 212ﾰF or 100ﾰC at atmospheric pressure (14.7 pounds per square inch gauge or 101.325 kilopascals).

the temperature at which the vapor pressure of the liquid is equal to the pressure exerted on it by the surrounding atmosphere.

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: (Cl) an ignition method used in diesel engines by which the air in the cylinder is compressed to such a degree by the piston that ignition occurs upon the injection of fuel. About a I-pound (7- kilopascal) rise in pressure causes a ZO-F (] O-C) increase in temperature.

n: the pounds-persquare- inch (kilopascal) increase in pressure at the end of the compression stroke in an engine, about 500 pounds per square inch (3,500 kilopascals) in a diesel engine.

n: 1. the amount of pressure exerted on the interior walls of a vessel by the fluid contained in it (as indicated by a pressure gauge). It is expressed in pounds per square inch gauge or in kilo- pascals. Gauge pressure plus atmospheric pressure equals absolute pressure. 2. pressure measured relative to atmospheric pressure considered as zero.

pressure read by a gauge that is set to zero at atmospheric pressure.

n: The change in pore pressure per unit depth, typically in units of pounds per square inch per foot (psi/ft) or kilopascals per meter (kPa/m). The geopressure gradient might be described as high or low if it deviates from the normal hydrostatic pressure gra

n: most present-day seamless drill pipe falls into one of four American Petroleum Institute (API) grades. (1) E-75, with a minimum yield strength of 75,000 psi (517,125 kilopascals-kPa),a maximum yield strength of 105,000 psi (723,975 kPa),and a minimum tensile strength of 100,000 psi (689,500 kPa);(2) X- 95, with a minimum yield strength of 95,000 psi (655,025 kPa),a maximum yield strength of 125,000 psi (861,875 kPa),and a minimum tensile strength of 105,000 psi (723,975 kPa);(3) G-105, with a minimum yield strength of 105,000 psi (723,975 kPa),a maximum yield strength of 135,000 psi (930,825 kPa),and a minimum tensile strength of 115,000 psi (792,925 kPa);and S-135, with a minimum yield strength of 135,000 psi (930,825 kPa),a maximum yield strength of 165,000 psi (1,137,675 kPa),and a minimum tensile strength of 145,000 psi (999,775 kPa). V-150 is a non- API, but higher strength, grade. It has a minimum yield strength and a tensile strength of 150,000 psi (1,034,250 kPa).