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From general industry, oil-free, construction, high pressure marine to gas compression, National Marketing & Engineering has a product range to satisfy all requirements.
• Rotary Screw Compressors
• Oil-Free Compressors
• Vane Compressors
• Piston Compressors
• Portable Compressors
• Ancillary Products and Services |
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National Marketing and Engineering is an established and reliable Air Compressor company based in Harrison, Indiana just outside Cincinnati, Ohio. Our compressors, equipment and services are in use across the United States and around the globe providing economic, clean, quality and reliable compressed air and gas for almost every conceivable application.
Although we specialize in the sales, parts & services for Chinook, Unoair & Schulz Air Compressors, parts are available for all makes and models of compressor units in both rotary screw and piston types. We stock many replacement parts and those we don't stock can be quickly ordered for fast delivery. This includes lubricants - synthetic and semisynthetic and accessories for air compressors ranging from a complete line of dryers utilizing refrigeration or desiccant technology to filters which can provide you with oil and particle free air.
Major compressed air users can benefit from our wealth of experience and we are always happy to assist anyone who is experiencing difficulties or requires advice on any aspect of the Compressed Air industry. Through our unrivaled sales knowledge and quality services, we can become your partner for compressed air for many years to come.
National Marketing & Engineering is Intelligent Air Technology. |
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• Compressed Air Explained
Compressed Air is clean, safe, simple and efficient. There are no dangerous exhaust fumes of or other harmful by products when compressed air is used as a utility. It is a non-combustible, non-polluting utility.
When air at atmospheric pressure is mechanically compressed by a compressor, the transformation of air at 1 bar (atmospheric pressure) into air at higher pressure (up to 414 bar) is determined by the laws of thermodynamics. They state that an increase in pressure equals a rise in heat and compressing air creates a proportional increase in heat. Boyle's law explains that if a volume of a gas (air) halves during compression, then the pressure is doubled. Charles' law states that the volume of a gas changes in direct proportion to the temperature. These laws explain that pressure, volume and temperature are proportional, change one variable and one or two of the others will also change, according to this equation:
(P1 V1)/ T1 = (P2 V2)/T2
Where P=Pressure V=Volume and T=Temperature of the gas, 1 being an initial state before a change, 2 being final state after a change.
When applying this to a compressor, air volume (or flow) and air pressure can be controlled and increased to a level that suits the way it is being used. Compressed air is normally used in pressure ranges from 1 to 414 bar (14 to 6004 PSI) at various flow rates from as little as 0.1m3 (3.5 CFM - cubic feet per minute) and up. |
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