Kaeser Compressors
Air Compressor Guide
Type of Compressors
Evaluating a Compressed Air System
Selecting an Air Compressor
Glossary and Reference Data
Getting the Most for Your Money
How to Select and Protect Your Air Compressor Investment
Types of Compressors
     It is the fourth utility. Compressed air, along with gas, electricity and water, is essential to most modern industrial and commercial operations. It runs tools and machinery, provides power for material handling systems, and ensures clean, breathable air in contaminated environments. It is used by virtually every industrial segment from aircraft and automobiles to dairies, fish farming, and textiles.
     A plant's expense for its compressed air is often thought of only in terms of the cost of the equipment. Energy costs, however, represent as much as 70% of the total expense in producing compressed air. As electricity rates escalate across the nation and the cost of maintenance and repair increases, selecting the most efficient and reliable compressor becomes critical.
Rotary Screw Compressor: The Plant Workhorse
     Rotary screw compressors operate on the principle of positive displacement. Filtered air enters the inlet of the airend where male and female rotors unmesh. The air is trapped between the rotors and the airend housing. This space is reduced as the rotors remesh on the opposite side of the airend. Thus, the air is compressed and moved to the discharge port.
     Oil injected into the housing mixes with the air to seal, lubricate, and remove the heat generated by compression. This oil forms a thin film between the rotors that virtually eliminates metal-to-metal contact and wear. The oil is separated from the compressed air, cooled, filtered, and returned to the injection point. The compressed air then passes through an aftercooler to reduce its temperature and is ready for the air treatment equipment.
Types of Air Compressors
    1. Dynamic Centrifugal/Axial - Use a rotating impeller to impart velocity to the air, which is converted to pressure.
    2. Positive Placement
      Rotary - Compress air through the action of rotating elements. Most common types are rotary screw, which uses rotating male and female rotors to compress air, and sliding vane, which uses radially moving vanes.
      Reciprocating - Compress air through the use of a reciprocating piston.
     Select air compressors based on your plant needs. Positive displacement compressors take in quantities of air and mechanically reduce the space occupied by the air to increase pressure. Dynamic compressors use the mechanical action of rotating impellers to transfer pressure to the air.
Evaluating a Compressed Air System / Selecting an Air Compressor / Maintenance / Troubleshooting / Glossary and Reference Data