L O W   P R E S S U R E   P R O C E S S   A I R   S O L U T I O N S

Low pressure process air solutions.

With over 20,000 Centac® installations, Ingersoll Rand is a world leader in centrifugal compressor technology.

Clean air and clean water are vital components of successful economic development, and play a vital role for Ingersoll Rand solutions. That’s why you will find Ingersoll Rand CX blowers at work in applications ranging from flue-gas desulphurization to waste water treatment aeration.

In process industries, Ingersoll Rand CX blowers are engineered to provide continuous reliable service under the most demanding conditions. CX blowers enable the user to increase production efficiency in a variety of process applications, as varied as fermentation in food and beverage plants to combustion air supply in a refinery.

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Impeller• One-piece stainless steel construction

Inlet Guide Vanes• High corrosion resistance with standard stainless steel vanes• Integrally mounted to the blower with few moving parts

—ensuring high reliability• Mounted vane angle position indicator

Volute• Heavy-duty cast iron construction• Smooth contour design for aerodynamic efficiency

Diffuser• Machined diffuser vanes maximize blower efficiency• Ensures high efficiency transition to the volute

Air and Oil Seal• Air seal completely separate from gear case

to ensure 100% oil-free air• Gas injection/extraction air seal options for more demanding

applications• Exclusive windback labyrinth seal design in a horizontally split case

for simple inspection and maintenance• Oil seal incorporates an oil slinger ring and labyrinth seal on the outboard casing

side to prevent oil migration along shaft• Aluminum alloy construction standard with bronze or other materials available for demanding

applications

High-Speed Shaft Radial Bearings• Tilting pad design for excellent stability

at high speeds• Horizontally split with field-replaceable tilting pads

for simple inspection and maintenance• Carbon steel pads with white metal babbitt for long service life• Embedded RTDs in pads are available as an option

Design Features• Single-stage, oil-free centrifugal blower• Unique mixed-flow design maximizes

efficiency• Integral gear design• Shaft-driven main oil pump• Integral thrust collars transmit thrust

to low-speed gear• Reliable non-contact windback labyrinth seals• Replaceable tilting pad bearings on

high-speed pinion• Rotating assembly balanced separately and as

an assembly to ensure smooth operation

Versatility• Capacities exceeding 40,000 SCFM

(1133 m3/min) for air or gas applications• Pressures up to 30 psig (2 bar-g)• Mixed-flow impeller provides broader

operating range than traditional centrifugal designs

• Integral stainless steel inlet guide vanes provide flexibility and control

• Compact package for ease of installation and maintenance

• Standard frames available in package options to suit individual requirements

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High-Speed Pinion Gear/Shaft• Finely machined, one-piece chrome molybdenum steel unit• Integral thrust collars transfer aerodynamic and gear thrust loads to the

bullgear to improve reliability and reduce parasitic horsepower losses• RTDs or temperature indicators optional• X-Y vibration probes available inboard and outboard

Integral Gear Case• Horizontally split for simple maintenance

Bullgear, Shaft and Coupling• Bullgear and shaft are integral carbon steel forging• Bullgear shaft oil seal consists of oil slinger ring and reverse

thread labyrinth on shaft with labyrinth seal on gearcase• Oil seal is horizontally split

Bullgear Bearings• Driver side bullgear bearing is horizontally split radial journal

bearing with integral fixed tilted pad thrust bearings• Oil pump side bullgear bearing is one-piece radial journal bearing• Bearings have oil drains to ensure adequate lube oil supply• RTDs or temperature indicators optional• X-Y vibration probes available on driver side; labyrinth seal

is modified to include probe provisions

Main Oil Pump• Gear-rotor type pump• Driven directly by the bullgear shaft for reliable operation and

continued lubrication to bearings in the event of a power failure• Oversized to ensure adequate lubrication to all components

The CMC is the most advanced PLC for blowers available in the marketplace. The large graphical screen displays multiple data at once, reducing the navigation time to a minimum. Other features of this state-of-the-art controller include: alternate languages, real-time system diagnostics, event logging, and active security protection.

CMC Controller

Centac CX Series Blowers utilize exclusive windback labyrinth seals with the air seal completely separate from the gear case to ensure 100% oil-free air. The oil seal also incorporates an oil slinger ring on the outboard casing side to prevent oil migration along the shaft. Aluminum alloy construction is standard, with bronze or other materials available for more demanding applications.

Labyrinth Seals

The Centac CX Series blower utilizes a gear-rotor type pump that is integral to the gear case and driven by the bullgear shaft for reliable operation – ensuring bearing lubrication even in the event of power failure. The pump is actually oversized to ensure adequate lubrication to all components.

Main Oil Pump

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Ratio of inlet gas volume

Ratio

of s

haft

pow

er

–70°

–60°

–30°

0°+10°

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60

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100

120

Ratio of inlet gas volume

Ratio

of p

ress

ure

rise

–70°–60°

–30°0°

+10°

Angle of inlet vane

Operational line

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60

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100

120

Ratio of inlet gas volume

Ratio

of s

haft

pow

er

–70°

–60°

–30°

0°+10°

0 20 40 60 80 100 120

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60

80

100

120

Ratio of inlet gas volume

Ratio

of p

ress

ure

rise

–70°–60°

–30°0°

+10°

Angle of inlet vane

Operational line

Inlet Guide Vane Assembly

Efficient and Reliable ControlA unique property of a single-stage blower design is the ability to throttle the machine capacity using an inlet guide vane damper. Inlet guide vanes prerotate the inlet gas and use kinetic energy to reduce compressor power consumption in partial load conditions.

Throttle Behavior

Centrifugal Impeller  vs. Mixed-flow Impeller

The CX blower uses a mixed-flow machine design suitable for compression of air or gas. The gas flows smoothly across the face of the impeller into the diffusion chamber, reducing flow turbulence during compression, resulting in higher efficiencies and broader capacity range.

Centrifugal Impeller Mixed-flow Impeller

Performance Curves

5000(142)

00

5(0.34)

10(0.69)

15(1.03)

20(1.38)

25(1.72)

30(2.07)

10000(283)

15000(425)

20000(566)

25000(708)

30000(850)

35000(991)

40000(1133)

45000(1274)

PSIG

(BAR

G)

SCFM - Standard cubic feet per minute(m3/min) - Cubic meters per minute

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CX-3

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CX-4

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CX-6

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CX-7

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More than air. Solutions.Online solutions: www.air.irco.com

© 2005 Ingersoll Rand Company Form 8901 Printed in USA

Ingersoll Rand compressors are not designed, intended or approved for breathing air applications. Ingersoll Rand does not approve specialized equipment for breathing air applications and assumes no responsibility or liability for compressors used for breathing air service. Nothing contained on these pages is intended to extend any warranty or representation, expressed or implied, regarding the product described herein. Any such warranties or other terms and conditions of sale of products shall be in accordance with Ingersoll Rand’s standard terms and conditions of sale for such products, which are available upon request. Product improvement is a continuing goal at Ingersoll Rand. Designs and specifications are subject to change without notice or obligation.

Ingersoll Rand CompanyGlobal Process Air Solutions800-B Beaty StreetDavidson, NC 28078

Ingersoll Rand CompanyGlobal Process Air SolutionsStrada Provinciale Cassanese 10820060 Vignate, Milana, Italy

Ingersoll Rand CompanyIngersoll Rand (India) LTD22/29 G.I.D.C. Estate, NarodaAhmedabad, 382 330 India