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Air flow
Air drawn through the airfilter (AFce) into the compressor
element (CElp CEhp) is compressed. At the element
outlet, compressed air and oil pass into the air receiver/oil
separator (AR/OS).
The check valve (CV) prevents blow-back of compressed
air when the compressor is stopped. In the air receiver/oil
separator (AR/OS), most of the oil is removed from the
air/oil mixture.
The oil collects in the receiver and on the bottom of the
separator element.
The air leaves the receiver via a minimum pressure valve
(MPV) which prevents the receiver pressure from
dropping below the minimum working pressure, even
when the air outlet valves are open (specified in section
Limitations). This ensures adequate oil injection and
prevents oil consumption. The minimum pressure valve
(MPV) also functions as a check valve.
The system comprises temperature sensors (TS), pressure
sensors (PS) and a working pressure sensor (WPS).
OIL SYSTEM
The lower part of the air receiver (AR) serves as an oil
tank.
Air pressure forces the oil from the air receiver/oil
separator (AR/OS) through the oil cooler (OC), the oil
filters (OF) and the oil stop valve (OSV) to the compressor
element (CElp CEhp).
When the compressor is stopped and / or there is no
pressure in the system, the oil stop valve (OSV) prevents
the oil from flowing back into the compressor element.
The thermostatic by-pass valve (TBV) starts opening
when the oil temperature is 80°C (176°F) (when no
Oiltronix is installed). With installed Oiltronix, the
thermostatic by-pass valve starts opening when the oil
temperature is 40°C (104°F).
The compressor element has an oil gallery in the bottom of
its casing. The oil for rotor lubrication, cooling and sealing
is injected through holes in the gallery.
Lubrication of the bearings is ensured by oil injected into
the bearing housings.
The injected oil, mixed with the compressed air, leaves the
compressor element and re-enters the air receiver, where it
is separated from the air as described in section Air flow.
The oil that collects on the bottom of the oil separator
element is returned to the system through a scavenging
line (SL), which is provided with a flow restrictor.
The oil filter by-pass valve (BVof) opens when the
pressure drop over the filter is above normal because of a
clogged filter. The oil then by-passes the filter without
being filtered. For this reason, the oil filter must be
replaced at regular intervals (see section Preventive
maintenance schedule).
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Oiltronix
The oil system of XRYS and XRXS units is equipped with
the Oiltronix
system, a system that electronically
ΤΜ
controls oil temperature:
•
At all time the oil temperature is kept to a minimum
to elongate the lifetime of oil and compressor ele-
ments and to ensure proper lubrication.
•
The oil temperature is also controlled at all time to a
minimum level above the dewpoint, preventing water
vapour to condense in the vessel or oil system.
The optimum temperature is calculated based on ambient
conditions and operating conditions. In a next step the 3-
way valve is positioned in order to achieve this optimal oil
temperature by more or less bypassing the oil cooler. In
this way oil temperature regulation is more efficient.
ELECTRONIC REGULATING SYSTEM
To be able to control pressure and flow the AirXpert
system watches:
•
Ambient air pressure and temperature
•
Compressor air inlet pressure
•
Vessel pressure and temperature
Depending on the selection Pressure control or Flow
control, the compressor air inlet pressure, the engine speed
and the blow off valve are controlled to keep the selected
setting value (pressure or flow).
The system comprises temperature sensors (TShp TSlp),
pressure sensors (PSlp) and a working pressure sensor
(WPS).
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