Changing Compressor Oil

Lubricated reciprocating air compressors, like an automobile, require regular oil changes to ensure that bearings and piston skirts are receiving clean lubricant to prevent metal to metal contact. Most small reciprocating compressor manufacturers recommend oil changes every 12 months or 500 hours – whichever comes first. Many small reciprocating air compressors may operate on single phase power directly fed by a breaker. Three phase models may use an economically priced off-the-shelf magnetic motor starter. In both of these scenarios, there is usually no provision made to log hours on the compressor.

The Problem with Start/Stop Air Compressors
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Desiccant Air Dryer Types, Application Considerations and Solutions

AP-100-FP-A-compressorAlthough heatless dryers are simple in design, very reliable, and generally a low maintenance machine, the high cost to produce purge air for their use is a drawback to their use. Purge consumption may actually represent a higher percentage of actual air demand, as heatless dryers on a fixed time cycle will continue to use the same volume of purge air regardless of system demand. This excess purging will result in lower dew points which are usually not a requirement. As the dryers are normally over-sized to account for peak demand, and that demand may be reduced substantially throughout the

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When Will A Refrigerant Dryer Not Provide Suitable Drying?

In some applications, compressed air lines may be exposed to temperature below freezing levels. In these applications, the pressure dew point must be reduced to below the levels that a refrigerant air dryer can achieve, in order to prevent ice from forming in the compressed air lines. There are many applications where compressed air may come into contact with chemicals, food products or other products in which water vapor in the compressed air may interact negatively in the process. These applications are referred to as “process” applications, and it is often necessary to remove almost all of the water vapor

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When Should A Refrigerant Dryer Be Used?

Refrigerant Dryer

There are several types of compressed air dryers on the market, and many different applications for drying compressed air. Many industrial and commercial applications for compressed air will be for hand tools or the operation of pneumatic cylinders and valves in an indoor applications. These are referred to as “power” applications. For the most part, these applications require the air to be free of condensate (free liquid), which will impede the tool’s performance and cause corrosion, shortening the life of the tool. Refrigerant air dryers are usually selected for these applications. They remove water vapor from the compressed air by … Read the rest


Why do I Have Water in My Compressed Air Line?

When air is compressed to approximately 1/7 of it atmospheric volume (for 100 PSIG applications), there is a rise in temperature during the compression phase. This temperature rise allows water vapor in the air to be held in suspension during the compression stage. As a general rule of thumb, air will hold almost double the amount of water vapor in suspension with every 20ºF in temperature rise. This temperature rise is normally anywhere from 170 to 400ºF (76 – 205ºC) depending upon the type of air compressor being used. After compression, the air will cool as it travels through piping, … Read the rest

Protecting Your Regenerative Blower Investment

Motor Thermistors

In applying your regenerative blower, it is therefore necessary to know the operating conditions for the blower. Most blowers (including APPL’s standard models), include motor winding embedded thermistors for protection of the motor.  On small single phase units, these thermistor leads (in the motor terminal box) should be wired in series with the 115V hot lead supplied to the blower. On larger single phase units (over 15 amp service) and on 3 phase models, the thermistors may be used for pilot duty service only. With these voltages, a motor starter must be used and the thermistor should be

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About Regenerative Blowers

Several descriptive names have been used for “regenerative” blowers by different manufacturers, which may include “side channel”, “vortex”, or “ring compressors”. These are basic descriptions of the blowers based on the dynamic motion of the air stream inside the blower housing as it turns in a spiraling effect. As the impeller blades pass the inlet port in the blower, a low pressure area is generated that draws air/gas into the voids between the impeller blades. The air captured in these voids is thrown by centrifugal force from the base of the impeller to the housing perimeter, then is returned by

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Oil-less Air Compressors for Zero Oil Contamination

A variety of air compressors are available in the market of which oil-less air compressors are used to provide oil-free compressed air. They are used in critical operations, where products or processes could become contaminated if subjected to small amounts of oil. Contamination may result in costly scrapping of product and/or production downtime to clean or purify the system. Oil-less compressors may also be used with additional purifying filtration and safety controls to produce air for breathing applications in industry and medical systems.

oilless compressors

Oil-less reciprocating air compressors consist of dry compression chambers using synthetic self-lubricating guide rings and piston rings. … Read the rest