دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a multi-bladed propeller usually installed behind an engines radiator, which moves air over an engine. It helps cool the engine and equalizes the temperature of the air as it flows over the engine, thus preventing hot spots. Engine power usually operates the fan, although some fans have auxiliary electric motors that power them when the engine is stopped.

n: on an engine, one of usually several spring-loaded, lightweight metal plates placed over openings in the engines crankcase. Oxygen in the air entering the base of an engine mixes with the oil there. A hot spot could cause the oil and oxygen to explode and damage the crank- case. To prevent such damage, the spring- operated explosion covers (doors) open to release the pressure from the explosion. They then slam closed to prevent more air from entering. Also called explosion cover.

n: an abnormally hot place on a casing coupling when a joint is being made up. It usually indicates worn threads on the pipe and in the coupling.

an area in the upper mantle from which magma rises. A hot spot can endure for 10 million years or more.

a section of the formation with high gamma ray readings (usually above about 200 SPI units).