Screw Air Compressors

The heart of the SIERRA oil-free rotary screw air compressor is our superior two-stage compression module. Our rotors are precision-machined in a twenty-step manufacturing process that ensures unmatched rotor profile accuracy and repeatability. By using the highest quality bearings and precision gearing to maintain exact alignment of the rotors, you are assured of years of reliable, efficient service. Generously sized, anti-friction bearings easily handle all expected loads to keep the airend running smoothly. In the vital sealing arrangement, the SIERRA uses durable stainless steel for the air seals and a timeproven labyrinth design for the oil seals. This combination protects the rotors from lubrication impurities while keeping the loss of air through leakage to an absolute minimum, ensuring the continuous flow of clean, oil-free compressed air. The precision gearing incorporated in the compression module drive design optimizes both speed and rotor timing, providing trouble-free performance over a long life. And the improved lip seal on the bull gear drive input shaft eliminates any opportunity for oil leakage into the SIERRA package.

ULTRACOAT

Surface preparation creates minute crevices in our rotors and housing that tightly grip the ultracoat coating. The result is the most durable performance on the market, lowering our customers' energy costs and increasing the life of the airend in the oil-free compressor.

50 Hz Sierra 200-300 kW Performance

CMC Controller Featuring

• Provide a list of last 224 events
• Service scheduling
• Power outage restart

Variable Speed Drive, Oil-Free Rotary Screw Compressors

• Field-replaceable motor stator provides dramatically improved uptime
• Time-proven reliable Oil-Free two stage airend
• Ultracoat Solving the need for better oil-free performance and energy savings
• Unequaled efficiency and reliability.saves energy

A TRUE VARIABLE SPEED DRIVE OIL-FREE AIR COMPRESSOR

Only Ingersoll Rand offers Nirvana Oil-Free, the world's first true variable speed oil-free compressor for critical oil-free applications requiring the highest quality of air and the greatest reliability available on the market. By matching an innovative modular variable speed inverter with a HYBRID PERMANENT MAGNET® motor, Ingersoll Rand is again first-to-market, this time with a true variable-speed drive, oil-free air compressor. The two-stage Nirvana Oil-Free compressor has fewer rotating parts than any other rotary air compressor in its class, And the HPM® motor driving the Nirvana Oil-Free raises the standard on compressor reliability to an unequaled level. There are no motor bearings in the HPM® motor. And since the HPM® motor directly drives the compressor, there are no pulleys, belts or couplings to wear out, leak or need replacing. And there is nothing to get out of alignment. Coupled with Ingersoll Rand's time-proven, reliable two-stage oil-free airend, Nirvana Oil-Free is as reliable as an air compressor can get.

ULTRACOAT. SOLVING THE NEED FOR BETTER OIL-FREE PERFORMANCE AND ENERGY SAVINGS

 
The challenge: to give our customers an oil-free rotary compressor that operates at peak performance throughout its lifetime. With the introduction of our fixed speed oil-free compressor, SIERRA, we introduced UltraCoat. After 10 years of superior performance and peak performance in real world applications, UltraCoat has proven to be unmatched in its performance. We use UltraCoat to protect every SIERRA airend and now every NIRVANA Oil-Free airend. Ingersoll Rand's exclusive UltraCoat rotor and housing coating process uses a mechanical and chemical bond to insure the thinnest coating with the tightest possible grip, First, the rotor and housing surfaces are mechanically prepared to accept the coating. Then UltraCoat is precision-applied to insure the most even coat possible. Finally, all surfaces are heat-cured to solidify the mechanical/chemical bond. Compared to other coatings, UltraCoat delivers longer life and 10% energy savings. To help our customers get the best performance, we didn't limit our design efforts to the coating. We selected stainless steel and aluminum for the piping linking the intercooler with the stainless steel second-stage rotors. Condensation created in the cooling process cannot corrode these materials, eliminating the possibility of rust formation and carry through, further lengthening the life of the coating and rotors. Design innovations such as this and Ultracoat is what separates Nirvana Oil-Free from any other compressor in its class. Surface preparation creates minute crevices in our rotors and housing that tightly grip the ultracoat coating. The result is the most durable performance on the market, lowering our customers' energy costs and increasing the life of the airend in their nirvana oil-free compressor.

OIL-FREE ROTARY 10 YEAR LIFE CYCLE COST
 
Comparison at 70% average volume capacity; 4,000 hours per year; .05/kWh Comparison at 70% average volume capacity; 4,000 hours per year; .05/kWh

Traditional purchase decision factors represent only 20% of the cost to own and operate a rotary screw compressor while energy represents 60% of the life cycle cost. Only nirvana will save at least 30% of the energy cost over its life.