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Figure 5- 4 – PRESSURE DEW POINT OF COMPRESSED AIR
OIL SEPARATION RESERVOIR / COALESCING ELEMENT - This device serves multiple functions in
the compressor package:
·
Air/oil centrifugal separation - The bulk of the liquid oil is separated, by change of direction,
impingement and additional centrifugal effects, away from the compressed air and aerosol streams,
and is then gravity-collected at the bottom of the sump.
·
Oil degassing and holding - The sump has sufficient holding capacity to degas the oil mass before
it is drained off on its way to cooling, filtering and re-injection. It also serves as a storage volume for
the oil mass migrating from higher elevations (e.g., oil cooler, compressor casings, and piping).
·
Air/oil final separation - The aerosols and compressed air streams are led to the upper portion of
the sump, where the coalescing element resides. The fine droplets of oil (aerosol) are trapped in the
element media, coalesced, then gravity-drained, through a low-point connection and associated
tubing (oil return line) into a lower pressure region of the compressor.
Separation performance - The package oil separation system has been designed to yield 2 ppm total oil
carryover at the discharge of the air/oil reservoir – the oil content level at the discharge of the package will
be lower and will depend on the amount of moisture rejected by the aftercooler.
This high level of performance will be affected by the following typical offset conditions:
·
Contaminated (e.g., dirt, varnish, moisture) or damaged (e.g., ruptured) coalescing element.
·
Contaminated (e.g., dirt, varnish, moisture) or inadequate oil in use.
·
High oil level in air/oil reservoir.
·
Blockage of oil return line strainer or orifice.
·
Abnormally frequent or fast depressurization cycles - leading to oil foaming.
Pressure Dew Point Trend
40
50
60
70
Ambient Temp - °F
100psig
125psig
13-18-609
80
90
100
150psig
175psig
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