دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: on a roller cone bit, a coneshaped steel device from which the manufacturer either mills or forges steel teeth, or into which the manufacturer inserts tungsten carbide buttons. Most roller cone bits have three cones, which roll, or rotate, on bearings as the bit rotates. As the cones roll over the formation, the cutters on the cone scrape or gouge the formation to remove the rock.

n pI: (NESHAP) emissions standards set forth under CAA for airborne pollutants that are immediately hazardous to human health or that cause cancer, gene mutation, or reproductive harm.

abbr: National Emissions Standards for Hazardous Airborne Pollutants.

National Emission Standards for Hazardous Air Pollutants.

n: (NSPS) CAA standards that set forth allowable emissions for new major pollution sources and major modifications to existing sources. NSPS can extend to pollutants not included in NAAQS and NESHAP and may include VOCs and hydrogen sulphide.

n: the short pipe in a coneshaped separator that extends down into the cone body from the top and that forces the whirling stream of material to start downward toward the small end of the cone body.

n: A hollow tubular in the center of sleeve chuck of hydraulic cyclone.