engineering excellence
stellar
performance
A World Leader for Centrifugal Compressors
AIR COMPRESSOR SERIES
RELIABLE 100% OIL-FREE ENGINEERED AIR
P -500
Polaris
®
FS-Elliott’s Polaris ® Air Compressor Series incorporates the latest  technology to insure high efficiency,
economy and reliability.
The Plant Air Package (PAP) compressor was introduced to the marketplace nearly 50 years ago. Since its introduction, thousands of units have been installed and operate worldwide. • Electronics • Automotive
• Steel Making
• Glass Making and P.E.T. • Food and Beverage Processing • Mining  • Snow Making • Air Separation  • Utilities • Chemical
• Textile
• And Many Other Markets
The Polaris ® Air Compressor Series design features provide benefits ranging from ease of installation, operation and maintenance to highest efficiency. 1. High Base-load and Part-load Efficiency
2. Optimized Operational Efficiency Throughout the Entire Year
3. Minimum Number of Moving Parts
4. Robust and Reliable Industrial Design
5. Superior Package Design
6. Simple, Low-cost Installation
7. Elimination of Air Line Oil Contamination  8. Ease of Operation  9. Ease of Maintenance  10. Professional Service
It’s simple: The Polaris ® Air Compressor Series delivers 100% oil-free engineered air reliably and efficiently.
8 The air is compressed
through the third aero-dynamic stage and is dis- charged into the after-cooler.
5 The air exits the intercooler and flows into the inlet duct for the second stage. In the second stage
the compression process is repeat-ed with an impeller, diffuser, and a scroll casing.
6 The air discharges from the compressor volute and enters the second stage intercooler. The intercooling process is identical to that in the first stage.
7 Air from the second intercooler proceeds through inlet flow sec-tion for the third stage impeller.
4
The lower velocity cooled air exits the tube bundle and makes two 90 degree turns. This turning and upward flow path separates the condensed moisture from the cooled air and makes it unnecessary to use demister pads which are a high maintenance item. The air travels through the large corrosion resistant epoxy coated plenum.  Condensate is continuously drained through a drain valve located in the bottom of the intercooler’s enclosure.
3
Air enters the first stage high ef-ficiency intercooler and cools as it passes over the water filled tubes with external fins in the bundle. The straight tubes are easily cleaned to maintain optimum performance.
2 The air is accelerated by the first impeller. A radial diffuser converts the air’s velocity into pres-sure
before the air enters an efficient scroll casing.
Typical Operation
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2
3
4
5
7
6
1 Ambient air enters the first stage of the compressor through the
inlet control device.
9
8
9 The cooled air exits from the aftercooler into the air system.
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Innovative features make  the Polaris ® Air Compressor  Series a super-star performer.
The Polaris ® Air Compressor Series components are a shining example of reliability and efficiency.
The compressor cut-away view depicts the typical Polaris ® Air Compressor Series internals. The compressor driver is connected to the main
drive shaft end of the bull gear through a flexible coupling. The single helical bull gear is supported by two horizon-tally-split sleeve journal bearings, while the thrust is absorbed in either direction by flat-land thrust bearings. The bull gear drives two pinions with mounted impellers. The pinion shafts are designed to operate
location cleanedat the optimized rotational speed for the best efficiency.
Impellers
The impellers of the Polaris ® Air Compressor Series are stainless steel. The precipitation hardened, stainless steel material resists the corrosive and erosive action of atmospheric contaminants and wat
er vapor that may pass through the inlet air filter. The state-of-the-art backward-leaning impeller designs provide superior overall aerodynamic performance characteristics.
Pressure Lubrication System
The lubrication system has proven its reliability
through many years of successful operating experi-ence. The system is self-contained within the com-pressor package and is designed for easy access and maintenance. This system provides for all of the package’s needs, which include continuous oil flow to all bearings and gears, as well as the driver when required. The oil lubrication system is designed with ease of inspection and maintenance as one of its primary goals. Therefore, all of the oil connections are positioned in the lower half of the gear case for quick and simple access to the bearings, gears and
pinions.Corona Brand ™ Lubricants
For the optimum compressor system operation and extended service life, FS-Elliott recommends the use of Corona Brand™ lubricant. Our Corona Brand™ lubricant is supplied with all new FS-Elliott Polaris ® centrifugal compressors. This premium lubricant is designed for use with centrifugal com-pressors. This lubricant can also be retrofitted into existing installations.
The benefits of Corona Brand™ lubricants include:• Extended Lubricant Life • Minimizes Harmful Build-up • Excellent Wear Protection • Superior Resistance to Foaming • Longer Equipment Operating Cycles
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Free Oil Analysis Program
FS-Elliott provides a no-charge analysis service to all current clients that utilize our exclusive Corona Brand™ lubricants. In addition, we offer this same service to those end users that desire to retrofit their existing compression systems with our premium Corona Brand™ lubricants. Lubricant sampling and testing can and should be a part of every turboma-chinery user’s preventative maintenance practices. FS-Elliott recommends that in addition to normal daily and monthly inspections that a quarterly testing frequency be included in this regimen.The returned lubricant samples are analyzed and a report is gen-erated highlighting the current physical and chemical characteristics of the lubricant. Other timely and pertinent lubricant observations related to machinery operations are also included in the report along with
our recommendations.
The FS-Elliott Corona Brand™ lubricants are available in three container sizes: 330 gallon tote, 55 gallon drum and 5 gallon pail.
FS-Elliott provides an easy-to-use lubricant sample kit to assist in implementing this procedure into your maintenance routine. The FS-Elliott lubricant testing kit contains the following items:
• Lubricant Sample Container and Stick-on  Identification Label
• Self-addressed Mailing Container • Lubricant Datasheet
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REGULUS ® – Putting You  in Control
The heart of FS-Elliott’s centrifugal compressor is  the REGULUS ® Control System. This system is designed with the latest technology processor  and memory capabilities to provide optimum
performance, reliability and convenience. With the REGULUS ® System and a touch of the screen you can monitor and manage all of your air compressor needs at the unit or from a remote location. Every Polaris ® compressor is equipped with this power-ful management tool which provides continuous control for matching the equipment’s performance to changing plant operating requirements. Proper sequencing of events and protection of the rotating machinery and lubrication system are all built-in. A serial port is available that permits a single interface between the REGULUS ® and the User’s Distributive Control System (DCS). The system includes a color graphic touch-screen Human Machine Interface (HMI). Typical control modes include:• Constant Pressure
• Constant Pressure with Automatic Start • Combination Control
• Combination Control with Automatic  START/STOP
Control System Features
• Menu-driven Display
• System Data Logging and Printout • Adaptive Control
• Permissive and Protective Logic • Automatic Compensation on Temperature Change
Polaris ® P-500  Performance Range
Power Rating:
600 to 1000 HP / 450 - 745 kW Discharge Pressure:
45 to 150 psig / 3.1 to 10.3 bar g Flow Capacity:
2700 to 4500 ICFM / 75 to 130 m 3/min Note:
Performance may vary based on actual site conditions. Consult your authorized FS-Elliott distributor for more information.
The placement of the oil mist eliminator varies with motor selection.
Polaris ® P-500 Typical Configuration

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