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OF series
TWO STAGE OIL FREE SCREW AIR COMPRESSOR
The ELGi OF Series is a range of two-stage, oil-free air compressors designed for businesses demanding the highest compressed air purity levels. Engineered for efficiency and reliability, these two-stage compressors offer Class ‘0’ compressed air quality, making them ideal for sensitive applications.
Size :
WATER COOLED OF Series : 125-500HP
AIR COOLED OF-A Series : 60-250HP
Features
OF Series: Oil-free Screw Air Compressors. Oil-free air for all sustainable air needs.
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A Lower speed of airend: Provides better reliability due to lower gear ratios
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The usage of rigid Stainless Steel tubes: Improves product reliability and reduces maintenance
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Reduced pressure differentials: load-unload pressure differential is 2.9 psi: Reduces stress on the motor
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Tropical design: Ensures reliable operation at severe working temperatures (23ºF to 113ºF)
Efficiency / Cost of Ownership
Low life cycle cost- High-energy efficiency design delivers maximum UPTIME and lower cost of ownership
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A Lower speed of airend: Provides better reliability due to lower gear ratios
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The usage of rigid Stainless Steel tubes: Improves product reliability and reduces maintenance
-
Reduced pressure differentials: load-unload pressure differential is 2.9 psi: Reduces stress on the motor
-
Tropical design: Ensures reliable operation at severe working temperatures (23ºF to 113ºF)
Consistent Air Quality
Consistent oil-free air meeting ISO8573-1 class 0 oil standards.
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Food-grade coating is done where air contacts the metal surface inside the compressor: Ensures consistent oil-free air without metal debris
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Pipes have special e-coating: Ensures consistently clean and oil-free air
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Optimized rotor clearances: Ensures consistent air delivery as rotor coatings remain uniform
Applications
Specifications
Two-Stage Water Cooled OF Series: 125-500 HP
UPTIME Assurance Intelligent Control for Consistent Air Quality and Increased Uptime
Two-Stage Air Cooled OF-A Series: 60-250 HP
Variable Frequency Drives (VFD)
ISO 8573-1, Class "0" Oil-free air
ELGi’s unique eta-V rotor design reduces pressure losses and increases stage efficiencies
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Bearings
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Special bearings running at relatively low speeds and high temperatures
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Optimized for oil free compressor speeds and temperatures considering the load and unload conditions.
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Oil-Seal
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Non-contact type Visco seals made of Bronze
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Helical grooves cut with helix direction opposite to rotor rotation to prevent oil entry into compression chamber
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Casing
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Completely coated with PP coating (food grade)
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Water jackets are also coated with the same coating
Attributes and benefits
Coolers
Cupronickel coolers with a water-in-tube system for better heat transfer, least fouling factor in its kind with best thermal efficiency
Rotor
Rotor and housing are coated with a proprietary coating to resist corrosion and endure high temperatures up to 250°C. This results in optimum long-term performance with no loss in efficiency
Capacity Control Valve
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Hydraulic rack and pinion-type actuation
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Valve membrane made of stainless steel metal instead of elastomer
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More than one million cycles of life between rebuilds
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Simultaneous closing of inlet valve and opening of blow-off valve by rack and pinion to ensure safety and air-end life
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Less maintenance compared to electrically actuated valves
Air Seal
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Carbon-impregnated SS floating type seals
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Axially locked by Belleville spring and radially locked by compressed air
Oil Pump
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Separate motor-powered oil pump ensures lubrication before and during start of the machine (ensuring no dry running of gears and bearings)
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All oil tubing is made of Stainless Steel to increase reliabilityrnrn
Timing Gears
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Helical gears, precision ground to DIN 4 quality and case hardened to minimize transmission losses and noise during operation
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Dynamically balanced to reduce vibrations by optimizing the loads on bearings and increasing bearing lifern
Air - Water Flow Circuit
