Volume flow rate measured in normal cubic meters per minute (or hour); i.e., related back to normal inlet conditions.

A projecting aperture at the end of a tube, pipe etc. serving as an outlet for compressed air. Reduces the demand on the compressor by generating the highest thrust and volume for the lowest possible air consumption.

National Board of Boiler and Pressure Vessel Inspectors.

National Electrical Code.

A measuring tool used to check air pressure at the tool by inserting a hypodermic needle into the rubber hose.

A pressure below that of the existing atmospheric pressure taken as a zero reference.

National Electrical Manufacturers Association.

National Fluid Power Association.

Advanced SCUBA divers may decide to extend their time / depth underwater beyond the limits of a compressed air SCUBA diver. With special training and equipment, they can safely do this with an air mixture known as Nitrox, which is a special blend of oxygen and nitrogen that the certified Nitrox diver breaths. Only advanced certified Nitrox divers with special training and equipment are permitted to use Nitrox.

Non-lubricated compressor.

Unit of free air flow rate measured in normal cubic meter per hour.  It is the air in the following conditions:1.013 bar (pressure); 0^o Celsius (temperature), and 0% relative humidity.

When an air compressor continues to run, usually at full RPM, but no air is delivered, because the inlet is either closed off or modified and not allowing inlet air to be trapped.

An arbitrary filter efficiency rating.

Filter rating indicating the approximate particle size for which the majority will not pass through a given filter. It is generally interpreted as meaning that 85% of the particles of size equal to the nominal filter rating will be retained by the filter.

A term that implies that 98% of all particles larger than a stated micron size have been removed from the product being filtered through the filter element.

Constituents in the suction gas that cannot be condensed to a liquid with the cooling medium available.

Reciprocating type compressor used mainly in oil and gas field applications. The compressor cylinders operate at low compression ratios and experience small temperature rise.

A Gas that does not attack normal materials of construction.

A compressor designed to compress air or gas without contaminating the flow with lubricating oil. Piston rings and packing are usually made of TFE-based materials, carbon, or other synthetic material that operate without lubrication.

A term used for average atmospheric air at sea level in a temperature zone where it contains some moisture. It is defined in the ASME Test Code For Displacement Compressors as being at 14.696 psiA, 68 °F, 36% RH, and weighing 0.075 lb/cu ft. The k value is 1.395.

A projecting aperture at the end of a tube, pipe etc. serving as an outlet for compressed air. It reduces the demand on the compressor by generating the highest thrust and volume for the lowest possible air consumption.

The stationary seating surface, the inlet of a valve.

National Pipe Thread standard; a description for a specific pipe thread.

National Pipe Thread tapered; a description of a specific pipe thread.

Normal Temperature and Pressure, which is based upon a temperature of 32 ^oF (0 ^oC) and a pressure of 1 bara.

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