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Oil Free Air Compressors
AIR COMPRESSOR
TYPES
Oil-Free Compressed Air
• No oil utilized in the compression cycle
• After-cooled (25° of ambient)
• Minimal filtration (filtered to 25 microns)
Standard Compressed
Air (Oil-Flooded)
• Hot (Heat of compression is about 180°F.)
• Wet (Humidity in ambient air is sent downstream.)
• Oily (Oil-flooded compressors will pass oil downstream.)
Instrument-Quality (IQ) Compressed Air
• Oil-flooded air with after-treatment
• After-cooled (15-25°of ambient)
• Filtered (.01 micron and .01 ppm remaining
oil content)
• Very clean air, but possibility of oil
contamination exists
RULES OF THUMB
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- For every 20° that compressed air
drops in temperature, half of the water vapor will change
to a liquid.
- A 100-CFM air compressor can produce 55
gallons of water in 24 hours of straight run time.
- 1800-CFM at 100 PSI is approximately the
maximum air that can pass through a 3" hose.
- For electric air compressors, multiplying
HP times four (HP x 4) gives you the approximate CFM.
- As the pressure increases, the CFM decreases.
Conversely, as the pressure decreases, the CFM increases.
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QUESTIONS TO ASK
- What are the CFM and PSI requirements?
- What
type of compressor is needed?
a.
Diesel (standard, I-Q,
or oil-free)
b. Electric
- What is the application?
- What quality of air is required?
a. Particulates (micron)
b. Moisture (dew point)
c. Oil content (ppm)
- What type and size air connections will
we pipe to?
a. Pipe thread
b. Flange
c. Boss
d. Chicago (crows feet), etc.
- What type and size connections
do we need on the compressor? (Match hose fittings with compressors.)
a. Mpt, fpt
b. Boss
c. Chicago (crows feet)
d. Flange, etc.
- What is the distance from the compressor
to the process connection? (How many hose lengths
and whip
checks will
be needed?)
- Do you need low ambient
(below 35°F) protection?
- Compared to the overall dimensions of
the selected equipment, how much room do you have to place the
equipment?
- Is (aftercooler separators, dryers, or filters) needed.
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