INSTRUMENT QUALITY AIR – Oil Free is Preferred
The Instrument Society of America
definition of "Instrument Quality" Air is:
A maximum oil content of less than one
part per million (by weight);
The particle size in the air stream
must be less than 40 microns; and
The dew point must be 18ºF below the
minimum temperature to which the air is exposed
AirNow oil free centrifugal compressors
supplied with an associated refrigerated or desiccant
dryer is an excellent choice for supplemental or
temporary source of clean dry instrument quality
compressed air. It should be noted that +40 degree
dewpoint refrigerated dryers can be employed where
ambient conditions are expected to be above 60 degrees
F. Where ambient temperatures are expected below 60
degrees F, – 40 degree desiccant dryer can be utilized
to ensure air being supplied meets or exceeds Instrument
Air standard in low ambient operating conditions.
Instrument air quality is required in
pneumatic process control systems, laboratories, powder
coating, spray painting, packaging machines, automated
production equipment ect.
extensive use of compressed air in industry is second
only to the use of water. This air is used for tools,
forges, hoists, conveyors, instruments and a host of
other uses in the 100-125 PSIG range. Needless to say,
the loss of a plant’s compressed air supply can put a
manufacturing facility completely out of production.
This is where the AirNow Fleet of Oil-Free high capacity
rental compressors takes over. AirNow only rents the
inherently oil-free Ingersoll-Rand CENTAC centrifugal
plant air compressors, sizes ranging from 1,800 to over
21,000 CFM. We can normally have the equipment on the
way within 24 hours of a call. Our skid mounted units
require only power hook-up, cooling water, a small
amount of control air to start, and a discharge line to
carry the compressed air to the plant system.
example, a large Midwest foundry experienced a major
explosion in their plant air system severely damaging
the compressor house and shutting down the foundry. The
AirNow Compressor Fleet received the call at 4 p.m. for
five (5) C-25’s. The first two compressors arrived the
next day. Twenty-four hours after the call all five
Centacs were on site and one was running! Of course,
AirNow cannot always promise this rapid service, but it
is a good example of the effort we put into serving our
customers’ needs in times of emergency.
Compression Services has supplied plant air to
refineries, glass plants, automobile assembly plants,
appliance manufacturers and electric utilities just to
name a few.
Compressed air is supplied in high
volumes to facilitate the production of a wide variety
of products. Typically this compressed air supply is
required to be oil free, clean and dry as the air
contacts the product during the manufactureing process.
Process applications are typically continuous in nature
with flow rates that can exceed 25,000 CFM at pressures
of 20 to 100 psig. AirNow Compression Services fleet of
dynamic compressor rental packages are ideally suited
for process applications that require additional
temporary or supplemental process air.
Often process requirements may dictate
the need to use a associated aftercooler and dryer to
ensure proper compressed air quality is supplied to the
process. Knowledge of the required process dew point
will allow for proper selection of accessory equipment.