One of the greatest lessons you could learn when it comes to
compressed air distribution is to never underestimate the damage that can be
caused by condensation and contamination. In order to maximise equipment
lifespan and productivity, it is imperative that air is treated based on an
understanding of external conditions and required application.
There are several types of contaminants that can be found in
a compressed air system, the most common including:
There are however, other sources from which contamination
can occur, including the piping network and the compressor itself. This is
usually due to general wear and tear of such equipment over long-term use. The
presence of moisture and particulate matter in a pneumatic network can have a
severely detrimental effect on the distribution system. An inconsistent supply
of dry, clean air has the ability to cause costly production problems, air
leaks and pressure drop, as well as further damage and corrosion to equipment.
It is therefore vital to properly control condensate and contaminants by
following these three basic steps - dry, filter and separate:
Dry
Integrating an air
dryer into the compressed air system is an effective way of removing condensate
from the air before it reaches point of use. When air is compressed, the water
content is concentrated, allowing vaporised water to travel through the system.
A refrigerated air dryer cools the air, during which any water present is
condensed and then mechanically separated and discharged. The remaining dry air
can then be re-heated and moved through the piping network.
Filter
A well-planned
filtration system is integral to producing clean, dry compressed air. Filter
packages vary based on application, however will commonly include:
It is important to
consider the environmental impact of your compressed air system. Besides water,
condensate typically consists of 200-500ppm of oil, which equates to up to 5L
of your annual condensate collection (based on an average 18kW compressor).
Discharging this mixture into the ground or river can have a devastating effect
on plants and wildlife. Furthermore, discharge to the sewerage system is likely
to cause treatment plant malfunction and contravene local council laws.
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