Air

Compression

Oil free compressors

OF Series Oil-Free Rotary Screw Air Compressor 60-600hp

Elgi

ELGi is amongst the few screw air compressor manufacturers with an in house designed and manufactured oil-free airend. ELGi’s oil-free range provides class zero oil-free air with leading energy efficiency, reliability, and low operating costs, supported by a Best-in-class warranty.

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Features

OF Series: Oil-free Screw Air Compressors. Oil-free air for all sustainable air needs.

  • A Lower speed of airend: Provides better reliability due to lower gear ratios

  • 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)

Efficiency / Cost of Ownership

Low life cycle cost- High-energy efficiency design delivers maximum UPTIME and lower cost of ownership

  • Operates on low-pressure cooling-water head: Reduces power consumption of feedwater pumps

  • Lower temperature differential of cooling water: Power savings by reducing cooling water pump sizing

  • Optimized airend design delivers the best efficiency in its class at different pressures, providing a quicker return on investment

  • The OF series compressor package ensures that cooling water in-out temperature differential is only 14ºF compared to other conventional systems with 57.2ºF: Ensures lower thermal stress to the system, a better fouling factor and a lower cost of ownership

Consistent Air Quality

Consistent oil-free air meeting ISO8573-1 class 0 oil standards.

  • Food-grade coating is done where air contacts the metal surface inside the compressor: Ensures consistent oil-free air without metal debris

  • Pipes have special e-coating: Ensures consistently clean and oil-free air

  • Optimized rotor clearances: Ensures consistent air delivery as rotor coatings remain uniform

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Specifications

Two-Stage Water Cooled OF Series: 125-500 HP Two-Stage Air Cooled OF-A Series: 60-250 HP ISO 8573-1, Class "0" Oil-free air
UPTIME Assurance Intelligent Control for Consistent Air Quality and Increased Uptime Variable Frequency Drives (VFD) ELGi’s unique eta-V rotor design reduces pressure losses and increases stage efficiencies

Features and Benefits

Coolers

Coolers

  • Cupronickel coolers with water-in-tube system and is designed for temperature difference of max. 14ºF
  • Better Corrosion resistance and 28 times better thermal conductivity than stainless steel
Rotor

Rotor

  • Patented eta-V profile with 3/5 lobe for high swept volume and lower pressure ratio
  • Rotor operates at a lower speed due to the patented profile and fewer inter-lobe Leakages
  • Rotor and housing are coated with PTFE-based food-grade PP coating to resist
  • Corrosion and endure at high temperatures up to 482ºF. This results in optimum long-term performance with no loss of efficiency
Capacity control valve

Capacity Control Valve

  • Hydraulic rack and pinion-type actuation
  • Valve membrane made of stainless steel metal instead of elastomer
  • More than one million cycles of life between rebuilds
  • Simultaneous closing of inlet valve and opening of blow-off valve by rack and pinion to ensure safety and air-end life
  • Less maintenance compared to electrically actuated valves
Air Seal

Air Seal

  • Carbon-impregnated SS floating type seals
  • Axially locked by Belleville spring and radially locked by compressed air
Oil Pump

Oil Pump

  • Separate motor-powered oil pump ensures lubrication before and during start of the machine (ensuring no dry running of gears and bearings)
  • All oil tubing is made of Stainless Steel to increase reliabilityrnrn
Timing Gears

Timing Gears

  • Helical gears, precision ground to DIN 4 quality and case hardened to minimize transmission losses and noise during operation
  • Dynamically balanced to reduce vibrations by optimizing the loads on bearings and increasing bearing lifern

Applications

Beverage

Beverage

Food

Food

Textile

Textile

Pharma

Pharma

Metals

Metals

Power

Power

Oil & Gas

Oil & Gas

Automotive

Automotive

ELGi OF SERIES

To view performance-based technical specification tables, see the brochure.

Brochure

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