| The heart of any compressed air system is
the air compressor itself. When selecting an air compressor, the most important
factors to consider are quality and reliability. Reflected in quality and
reliability are overall cost, efficiency, and ease of maintenance. The
most cost-effective unit may not be the lowest priced. Components to evaluate
in a compressor include: |
| Airend: |
| Look at the package efficiency and check with
the manufacturer for engineering data. Evaluate proven performance and
reliability. |
| Cooling Systems: |
| Must be adequate to handle maximum ambient
operating temperature. Air-cooled compressors have either integrally mounted
or separate oil and air coolers. |
| Drive: |
| Efficiency is critical. Belt drives are easier
to maintain and provide the most flexibility in pressure selection. Automatic
belt-tensioning devices ensure transmission efficiency and protect bearings
from excess stress. |
| Controls: |
| System must be reliable, readable, and run
the compressor efficiently. |
| Interconnecting Piping: |
| Look for rigid piping with flexible connections
to eliminate leaks. |
| Filtration: |
| Performance filters protect the compressor
from contamination. |
| Motor: |
| Compare brake horsepower to nameplate rating.
Motors which go into the service factor are less reliable. Also, TEFC motors
are protected better against contaminants than ODP motors. |
| Energy savings at reduced flow requirements
depend solely on the ability of the compressor control to translate reduced
air flow into lower electrical power consumption. The chart below shows
the relationship between the full load power required for a compressor
at various air demands and common control types. It becomes apparent that
the on line-off line control (dual control) is superior to other controls
in translating savings in air consumption into real power savings. |
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Types of Compressors
/ Evaluating a Compressed Air System / Maintenance
/ Troubleshooting / Glossary
and Reference Data
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