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VL-HP
Service
& Operation Manual
U.S. TAX STAMPING
EQUIPMENT
Manufactured by United Silicone
an ITW company
coalescing filter to try to remove as much oil as possible from the compressed air
stream. The number of heads (1 or 2) on a piston compressor relates to the total
amount of air output. Generally dual head compressors will handle larger CFM
requirements (typically 30+ CFM at 90 psi). As mentioned earlier, rotary
compressors are usually designed to run a 100% duty cycle while most reciprocating
compressors are usually used on a 50%-66% duty cycle. As such, it is usually
necessary to specify a larger capacity reciprocating compressor in order to provide the
same output as a rotary compressor.
A storage tank is designed to allow the compressor to not have to run full time to
supply all of the necessary air flow. Typically a tank is sized to be 2-4 gallons per
CFM output from the compressor (example: a 20 CFM compressor typically has a 40-
80 gallon tank). In many cases, water will condense inside portions of the
compressed air circuit – including the compressed air tank. These tanks are designed
with drains so that the water can be removed regularly (typically daily). Keep in
mind that a significant amount of water can be removed, so it is important to have a
drain or other means to remove the collected water from your facility.
Aftercooler
The after cooler is used to bring the temperature of the compressed air to sufficiently
low temperatures so that it can be properly dried by either a desiccant dryer or
refrigerated dryer. In some systems, the aftercooler and dryer are integrated into a
single system. Most aftercoolers are similar to automobile radiators consisting of a
heat exchanger and a fan which forces room air past the heat exchanger to cool the
compressed air.
Dryer
Under typical warehouse operating conditions, a dryer is needed which has a
throughput (SCFM) equal to or greater than the total anticipated compressed air
requirement. Drying capacity is specified in units of “Dew Point”. A typical
refrigerated dryer supplies air with a maximum dew point of around 37F meaning that
the air exiting the dryer would not be expected to condense out moisture if it were
kept above a temperature of 37F. When selecting a dryer for a facility where the
ambient temperatures are expected to fall below the dew point of the dryer, US Tax
Stamping recommends consulting directly with a compressor dryer manufacture to
discuss the specific details of the installation. Special Desiccant Dryers are available
that can produce very low dew points if needed. Regardless of which type of dryer
you use, note that depending upon the conditions of operation, significant quantities
of water may be removed by the dryer. It is usually necessary to have a floor drain or
other provision near the dryer to allow easy removal of the condensed water from
your facility.
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