Oil-free compression rotary screw compressors with water-cooling


Compact energy-savers

Thanks to refined and robust drive and cooling solutions, we achieve extremely low power consumption values.
If you additionally operate a Kaeser heat recovery system, you can save a significant amount on your heating costs. Consult our experts for advice!
What’s more, with their impressively compact design and relatively small exhaust air duct, our oil-free compression rotary screw compressors with water-cooling can be installed in smaller, low-ceilinged compressor rooms.

  • Flow rate from 107 to 1790 cfm
  • Also available as a peak load model with variable speed control and frequency converter (SFC models)
  • Also with integrated i.HOC rotation dryer

Your benefits

  • Particularly low compressed air discharge temperature:
    The tube bundle for the two air/water heat exchangers consists of high-quality stainless steel pipes with roller-expanded aluminium star profile for optimum heat transfer.
  • Lower costs thanks to heat recovery:
    With a Kaeser heat recovery system, up to 96% of compressor exhaust heat can be recycled – for example, to heat water up to +194°F.
  • Exceptionally maintenance-friendly:
    The air/water heat exchangers for the 1st and 2nd compressor stages are housed in two separate enclosures, each with optimal accessibility thanks to large maintenance doors.

Highlights of our water-cooled CSG series

Compact footprint and ideal cooling

Snowflake profile in all air-conducting pipes for optimal cooling.

For perfect cooling, all air-conducting pipes are equipped with the innovative snowflake profile, which offers a number of advantages: The profile has a 46% higher heat transfer area, allowing for a 10% reduction in heat exchanger length and a 19% reduction in compressor footprint.

Optimal cooling water flow

Water-cooled CSG compressors are equipped with water regulating valves, which optimize the cooling water flow for all consumers downstream from each heat exchanger. This ensures cost-efficient and sustainable cooling water use. Furthermore, KAESER uses regulating valves that are airtight when closed at the water outlet. If the compressor does not require cooling, for example in standby operation, the water flow is stopped, resulting in more efficient usage of the cooling water.

Water regulating valves for efficient and sustainable cooling water use.

Reduced pressure loss

Reduced pressure loss thanks to optimized air inlet and outlet.

The flow-optimized air inlet and outlet ensures significantly reduced pressure loss. In addition, the cooler air flow path is made of hygienic stainless steel.

 

Water-cooled, oil-free compression rotary screw compressors in detail

Equipment

Complete package

  • Ready for operation
  • Fully automatic
  • Super-soundproofing
  • Vibration dampening
  • Service-friendly design
  • For ambient temperatures up to +115 °F

Airend

  • Two-stage, oil-free compression rotary screw compressor with precision gearing as per AGMA Q13/DIN-Class 5
  • 2nd compression stage with stainless steel rotors and jacket cooling
  • Rotors feature durable coating
  • Integrated oil tank with oil tank ventilation via a microfilter
  • Fiber-free pulsation dampeners downstream of both compression stages

Drive motor

Super premium efficiency drive motor IE4 logo
  • Manufactured by SIEMENS
  • Premium and Super Premium Efficiency Motor
  • Continuous motor winding temperature monitoring
  • IP 55 protection

Cooling

  • Separate shell and tube heat exchangers with coated steel tube and CuNi10Fe pipes
  • Copper-soldered plate-type heat exchanger as gear oil cooler

Electrical components

  • Control cabinet to IP 54
  • Switching cabinet ventilation
  • Automatic wye-delta protection combination
  • Control transformer

SIGMA CONTROL 2

SIGMA CONTROL 2 compressor controller
  • Plain text display
  • 30 selectable languages
  • Soft-touch keys with icons
  • Traffic-light LEDs for at-a-glance operational status
  • Fully automatic monitoring and control
  • Dual, Quadro, Vario and Continuous control included as standard
  • Interfaces: Ethernet
  • Optional communication modules for Profibus DP, Modbus, Profinet and DeviceNet
  • SD-card slot for data logging and updates
  • RFID reader
  • Web server
Quality in detail

Fiber-free pulse dampers

Fiber-free pulsation dampers

Kaeser's new fiber-free pulse dampers keep pressure losses to an absolute minimum, help maintain consistent air quality and, unlike fiber versions, do not present a source of contamination for the compressed air.

Highly efficient condensate separator

High-efficiency condensate separator

Thanks to its flow-optimized design, the newly developed condensate separator reliably separates the condensate downstream from the air coolers, with minimal pressure loss.

Options

Bolt-down machine mounts

  • Machine mounts for bolting the unit to the floor

Heat recovery

  • Integrated heat exchanger system including parallel shell and tube heat exchangers, heat exchanger (water/water), pump, expansion valve, and water control valves

Hot air connection

  • Direct use of the hot compressed air, e.g. for heat regenerating desiccant dryer or as hot process air.
  • With certain models, the required hot air temperature can be controlled in ranges.
Maximum savings with energy recovery

Efficient and convenient use of recyclable compressor heat

With an integrated heat recovery module, recyclable compressor heat can be used for hot air space or process heating, as well as for heating of service or process water to temperatures up to 90 °C. This makes it possible to achieve an amortization period of less than a year.

Hot water up to +90 °C

Hot water from heat recovery up to +90°C

Recovered heat energy can be used in any number of ways. Heat recovery provides warm water up to 90 °C as appropriate for specific applications.

Heat recovery a win

Maximum heat recovery with rotary screw compressors.

Amazingly, 100 percent of the electrical energy input to a compressor is converted into heat. Of this, up to 96 percent is available for heat recovery purposes.

Maximum availability despite heat recovery

Maximum availability with optional internal water circulation loop.

During maintenance work on the water system of the heat recovery system other than the compressor, an optionally available complete internal water circuit (with pump, expansion valve, safety valve, etc.) ensures reliable compressor performance.

Reliable heat recovery for your application

For self-protection purposes, compressors with integrated heat recovery are equipped with a secondary water system. This separation into a primary and secondary water system not only ensures reliable compressed air supply availability with optimum heat recovery performance, but also provides the flexibility of coupling or decoupling the oil and jacket cooling to / from the heat recovery system according to required heating demand.

Technical specifications CSG-2 W

Standard version

ModelCSG 55-2 W CSG 70-2 W CSG 90-2 W
Working pressure psi 90 125 60 90 125 60 90 125 145
Flow rate complete system at working pressure acfm 253 198 350 304 251 396 348 302 278
Max. positive pressure psi 90 125 60 90 125 60 90 125 145
Nominal motor output hp 50 60 75
Dimensions
W x D x H in 		98 x 65 x 77 98 x 65 x 77 98 x 65 x 77
Compressed air connection2½ ANSI class 150 2½ ANSI class 150 2½ ANSI class 150
Sound pressure level dB(A) 65 65 66
Weight lb 5,004 5,093 5,236

ModelCSG 120-2 W CSG 130-2 W
Working pressure psi 60 90 125 145 125 145
Flow rate complete system at working pressure acfm 465 464 426 462 461
Max. positive pressure psi 90 125 145 125 145
Nominal motor output hp 100 125
Dimensions
W x D x H in 		98 x 65 x 77 98 x 65 x 77
Compressed air connection2½ ANSI class 150 2½ ANSI class 150
Sound pressure level dB(A) 67 69
Weight lb 5,545 5,820

T version

ModelCSG 55-2 T W CSG 70-2 T W CSG 90-2 T W
Working pressure psi 90 125 60 90 125 60 90 125 145
Flow rate complete system at working pressure acfm 253 198 350 304 251 396 348 302 278
Max. positive pressure psi 90 125 60 90 125 60 90 125 145
Nominal motor output hp 50 60 75
Pressure dew point °F 37 37 37
Refrigerated dryerABT 130 ABT 130 ABT 130
Dimensions
W x D x H in 		112 x 65 x 77 112 x 65 x 77 112 x 65 x 77
Compressed air connection2½ ANSI class 150 2½ ANSI class 150 2½ ANSI class 150
Sound pressure level dB(A) 65 65 66
Weight lb 5,556 5,644 5,787

ModelCSG 120-2 T W CSG 130-2 T W
Working pressure psi 125 145 125 145
Flow rate complete system at working pressure acfm 426 462 461
Max. positive pressure psi 125 145 125 145
Nominal motor output hp 100 125
Pressure dew point °F 37 37
Refrigerated dryerABT 130 ABT 130
Dimensions
W x D x H in 		112 x 65 x 77 112 x 65 x 77
Compressed air connection2½ ANSI class 150 2½ ANSI class 150
Sound pressure level dB(A) 67 69
Weight lb 6,096 6,371

SFC version

ModelCSG 70-2 SFC W CSG 90-2 SFC W CSG 120-2 SFC W
Working pressure psi 60 90 125 145 60 90 125 145 60 90 125 145
Flow rate complete system at working pressure acfm 107 - 346 107 - 307 114 - 263 131 - 238 124 - 417 128 - 385 137 - 334 140 - 309 148 - 472 146 - 471 146 - 450 149 - 424
Max. positive pressure psi 145 90 145 145
Nominal motor output hp 75 75 100
Dimensions
W x D x H in 		98 x 65 x 77 98 x 65 x 77 98 x 65 x 77
Compressed air connection2½ ANSI class 150 2½ ANSI class 150 2½ ANSI class 150
Sound pressure level dB(A) 65 67 68
Weight lb 5,203 5,203 5,291

ModelCSG 130-2 SFC W
Working pressure psi 60 90 125 145
Flow rate complete system at working pressure acfm 155 - 482 153 - 480 150 - 479 148 - 478
Max. positive pressure psi 145
Nominal motor output hp 125
Dimensions
W x D x H in 		98 x 65 x 77
Compressed air connection2½ ANSI class 150
Sound pressure level dB(A) 69
Weight lb 5,467

T-SFC version

ModelCSG 70-2 T SFC W CSG 90-2 T SFC W CSG 120-2 T SFC W
Working pressure psi 60 90 125 145 60 90 125 145 90 125 145
Flow rate complete system at working pressure acfm 107 - 346 107 - 307 114 - 263 131 - 238 124 - 417 128 - 385 137 - 334 140 - 309 146 - 471 146 - 450 149 - 424
Max. positive pressure psi 145 90 145 145
Nominal motor output hp 75 75 100
Pressure dew point °F 37 37 37
Refrigerated dryer
Dimensions
W x D x H in 		112 x 65 x 77 112 x 65 x 77 112 x 65 x 77
Compressed air connection2½ ANSI class 150 2½ ANSI class 150 2½ ANSI class 150
Sound pressure level dB(A) 65 67 68
Weight lb 5,754 5,754 5,842

ModelCSG 130-2 T SFC W
Working pressure psi 90 125 145
Flow rate complete system at working pressure acfm 153 - 480 150 - 479 148 - 478
Max. positive pressure psi 145
Nominal motor output hp 125
Pressure dew point °F 37
Refrigerated dryer
Dimensions
W x D x H in 		112 x 65 x 77
Compressed air connection2½ ANSI class 150
Sound pressure level dB(A) 69
Weight lb 6,019

RD version

ModelCSG 55-2 i.HOC W CSG 70-2 i.HOC W CSG 90-2 i.HOC W
Working pressure psi 90 125 90 125 90 125 145
Flow rate complete system at working pressure acfm 253 198 304 251 348 302 278
Max. positive pressure psi 90 125 90 125 90 125 145
Nominal motor output hp 50 60 75
Pressure dew point °F -15 -30 -13 -28 -11 -27 -31
Dimensions
W x D x H in 		124 x 65 x 77 124 x 65 x 77 124 x 65 x 77
Compressed air connection2½ ANSI class 150 2½ ANSI class 150 2½ ANSI class 150
Sound pressure level dB(A) 65 65 66
Weight lb 6,581 6,669 6,812

ModelCSG 120-2 i.HOC W CSG 130-2 i.HOC W
Working pressure psi 90 125 145 125 145
Flow rate complete system at working pressure acfm 464 426 462 461
Max. positive pressure psi 90 125 145 125 145
Nominal motor output hp 100 125
Pressure dew point °F -5 -23 -28 -22 -27
Dimensions
W x D x H in 		124 x 65 x 77 124 x 65 x 77
Compressed air connection2½ ANSI class 150 2½ ANSI class 150
Sound pressure level dB(A) 67 69
Weight lb 7,121 7,397

RD SFC version

ModelCSG 70-2 i.HOC SFC W CSG 90-2 i.HOC SFC W CSG 120-2 i.HOC SFC W
Working pressure psi 90 125 145 90 125 145 90 125 145
Flow rate complete system at working pressure acfm 107 - 307 114 - 263 131 - 238 128 - 385 137 - 334 140 - 309 146 - 471 146 - 450 149 - 424
Max. positive pressure psi 145 90 145 145
Nominal motor output hp 75 75 100
Pressure dew point °F -13 -28 -32 -9 -26 -30 -6 -22 -28
Dimensions
W x D x H in 		124 x 65 x 77 124 x 65 x 77 124 x 65 x 77
Compressed air connection2½ ANSI class 150 2½ ANSI class 150 2½ ANSI class 150
Sound pressure level dB(A) 65 67 68
Weight lb 6,790 6,790 6,878

ModelCSG 130-2 i.HOC SFC W
Working pressure psi 90 125 145
Flow rate complete system at working pressure acfm 153 - 480 150 - 479 148 - 478
Max. positive pressure psi 145
Nominal motor output hp 125
Pressure dew point °F -6 -22 -26
Dimensions
W x D x H in 		124 x 65 x 77
Compressed air connection2½ ANSI class 150
Sound pressure level dB(A) 69
Weight lb 7,055

Add-on refrigerated dryer

ModelABT 130
Power consumption2.4
Pressure dew point °F 37
RefrigerantR-513A
Global warming potential — 631
Refrigerant volume lb 3.3
Refrigerant mass as CO2 equivalent t 0.9
Hermetic refrigeration circuit-

Technical specifications DSG-2 W

Standard version

ModelDSG 140-2 W DSG 180-2 W DSG 220-2 W
Working pressure psi 90 125 145 60 90 125 145 60 90 125 145
Flow rate complete system at working pressure acfm 579 576 512 821 692 689 576 910 819 780 689
Max. positive pressure psi 125 145 60 125 145 60 90 125 145
Nominal motor output hp 125 150 175
Dimensions
W x D x H in 		135 x 69 x 81 135 x 69 x 81 135 x 69 x 81
Compressed air connection3 ANSI class 150 3 ANSI class 150 3 ANSI class 150
Sound pressure level dB(A) 69 70 71
Weight lb 6,834 7,165 7,385

ModelDSG 260-2 W DSG 290-2 W
Working pressure psi 60 90 125 145 90 125 145
Flow rate complete system at working pressure acfm 966 964 908 816 963 961
Max. positive pressure psi 90 125 145 125 145
Nominal motor output hp 200 250
Dimensions
W x D x H in 		135 x 69 x 81 135 x 69 x 81
Compressed air connection3 ANSI class 150 3 ANSI class 150
Sound pressure level dB(A) 74 75
Weight lb 7,716 8,157

SFC version

ModelDSG 180-2 SFC W DSG 220-2 SFC W DSG 260-2 SFC W
Working pressure psi 60 90 125 145 60 90 125 145 60 90 125 145
Flow rate complete system at working pressure acfm 305 - 795 332 - 761 312 - 665 337 - 615 274 - 823 295 - 821 320 - 773 378 - 737 305 - 967 330 - 966 347 - 911 364 - 858
Max. positive pressure psi 100 145 125 145 110 145
Nominal motor output hp 150 175 200
Dimensions
W x D x H in 		135 x 69 x 81 135 x 69 x 81 135 x 69 x 81
Compressed air connection3 ANSI class 150 3 ANSI class 150 3 ANSI class 150
Sound pressure level dB(A) 71 72 75
Weight lb 8,488 8,708 9,039

ModelDSG 290-2 SFC W
Working pressure psi 60 90 125 145
Flow rate complete system at working pressure acfm 323 - 1,061 367 - 1,060 418 - 1,058 447 - 1,057
Max. positive pressure psi 145
Nominal motor output hp 250
Dimensions
W x D x H in 		135 x 69 x 81
Compressed air connection3 ANSI class 150
Sound pressure level dB(A) 76
Weight lb 9,480

RD version

ModelDSG 140-2 i.HOC W DSG 180-2 i.HOC W DSG 220-2 i.HOC W
Working pressure psi 90 125 145 90 125 145 90 125 145
Flow rate complete system at working pressure acfm 579 576 512 692 689 576 819 780 689
Max. positive pressure psi 125 145 125 145 90 125 145
Nominal motor output hp 125 150 175
Pressure dew point °F -13 -30 -33 -14 -30 -33 -14 -30 -33
Dimensions
W x D x H in 		168 x 69 x 81 168 x 69 x 81 168 x 69 x 81
Compressed air connection3 ANSI class 150 3 ANSI class 150 3 ANSI class 150
Sound pressure level dB(A) 69 70 71
Weight lb 9,259 9,590 9,811

ModelDSG 260-2 i.HOC W DSG 290-2 i.HOC W
Working pressure psi 90 125 145 90 125 145
Flow rate complete system at working pressure acfm 964 908 816 963 961
Max. positive pressure psi 90 125 145 125 145
Nominal motor output hp 200 250
Pressure dew point °F -14 -29 -33 -15 -29 -32
Dimensions
W x D x H in 		168 x 69 x 81 168 x 69 x 81
Compressed air connection3 ANSI class 150 3 ANSI class 150
Sound pressure level dB(A) 74 75
Weight lb 10,141 10,582

RD SFC version

ModelDSG 180-2 i.HOC SFC W DSG 220-2 i.HOC SFC W DSG 260-2 i.HOC SFC W
Working pressure psi 90 125 145 90 125 145 90 125 145
Flow rate complete system at working pressure acfm 332 - 761 312 - 665 337 - 615 295 - 821 320 - 773 378 - 737 330 - 966 347 - 911 364 - 858
Max. positive pressure psi 100 145 125 145 110 145
Nominal motor output hp 150 175 200
Pressure dew point °F -14 -29 -33 -15 -30 -33 -15 -29 -33
Dimensions
W x D x H in 		168 x 69 x 81 168 x 69 x 81 168 x 69 x 81
Compressed air connection3 ANSI class 150 3 ANSI class 150 3 ANSI class 150
Sound pressure level dB(A) 71 72 75
Weight lb 10,913 11,133 11,464

ModelDSG 290-2 i.HOC SFC W
Working pressure psi 90 125 145
Flow rate complete system at working pressure acfm 367 - 1,060 418 - 1,058 447 - 1,057
Max. positive pressure psi 145
Nominal motor output hp 250
Pressure dew point °F -14 -29 -32
Dimensions
W x D x H in 		168 x 69 x 81
Compressed air connection3 ANSI class 150
Sound pressure level dB(A) 76
Weight lb 11,905

Technical specifications FSG-2 W

Standard version

ModelFSG 300-2 W FSG 350-2 W FSG 420-2 W
Working pressure psi 60 90 125 145 60 90 125 145 60 90 125 145
Flow rate complete system at working pressure acfm 1,269 1,144 1,006 795 1,391 1,388 1,261 1,148 1,747 1,589 1,501 1,261
Max. positive pressure psi 60 90 125 145 90 125 145 60 90 125 145
Nominal motor output hp 250 300 350
Dimensions
W x D x H in 		144 x 82 x 87 144 x 82 x 87 144 x 82 x 87
Compressed air connection6 ANSI class 150 6 ANSI class 150 6 ANSI class 150
Sound pressure level dB(A) 74 75 76
Weight lb 11,574 12,015 12,456

ModelFSG 500-2 W FSG 501-2 W
Working pressure psi 90 125 145 145
Flow rate complete system at working pressure acfm 1,772 1,769 1,586 1,766
Max. positive pressure psi 125 145 145
Nominal motor output hp 450 450
Dimensions
W x D x H in 		144 x 82 x 87 144 x 82 x 87
Compressed air connection6 ANSI class 150 6 ANSI class 150
Sound pressure level dB(A) 76 77
Weight lb 13,118 13,118

SFC version

ModelFSG 420-2 SFC W FSG 500-2 SFC W
Working pressure psi 60 90 125 145 60 90 125 145
Flow rate complete system at working pressure acfm 550 - 1,786 566 - 1,608 608 - 1,499 653 - 1,400 550 - 1,793 604 - 1,790 666 - 1,788 702 - 1,700
Max. positive pressure psi 90 145 145
Nominal motor output hp 350 450
Dimensions
W x D x H in 		144 x 82 x 87 144 x 82 x 87
Compressed air connection6 ANSI class 150 6 ANSI class 150
Sound pressure level dB(A) 77 77
Weight lb 13,779 14,771

RD version

ModelFSG 300-2 i.HOC W FSG 350-2 i.HOC W FSG 420-2 i.HOC W
Working pressure psi 90 125 145 125 145 90 125 145
Flow rate complete system at working pressure acfm 1,144 1,006 795 1,261 1,148 1,589 1,501 1,261
Max. positive pressure psi 90 125 145 125 145 90 125 145
Nominal motor output hp 250 300 350
Pressure dew point °F -8 -26 -30 -26 -30 -10 -26 -30
Dimensions
W x D x H in 		176 x 82 x 87 176 x 82 x 87 176 x 82 x 87
Compressed air connection6 ANSI class 150 6 ANSI class 150 6 ANSI class 150
Sound pressure level dB(A) 74 75 76
Weight lb 14,110 14,551 14,991

ModelFSG 500-2 i.HOC W FSG 501-2 i.HOC W
Working pressure psi 90 125 145 145
Flow rate complete system at working pressure acfm 1,772 1,769 1,586 1,766
Max. positive pressure psi 125 145 145
Nominal motor output hp 450 450
Pressure dew point °F -10 -26 -30 -30
Dimensions
W x D x H in 		176 x 82 x 87 176 x 82 x 87
Compressed air connection6 ANSI class 150 6 ANSI class 150
Sound pressure level dB(A) 76 77
Weight lb 15,653 15,653

RD SFC version

ModelFSG 420-2 i.HOC SFC W FSG 500-2 i.HOC SFC W
Working pressure psi 90 125 145 90 125 145
Flow rate complete system at working pressure acfm 566 - 1,608 608 - 1,499 653 - 1,400 604 - 1,790 666 - 1,788 702 - 1,700
Max. positive pressure psi 90 145 145
Nominal motor output hp 350 450
Pressure dew point °F -10 -26 -30 -17 -27 -30
Dimensions
W x D x H in 		176 x 82 x 87 176 x 82 x 87
Compressed air connection6 ANSI class 150 6 ANSI class 150
Sound pressure level dB(A) 77 77
Weight lb 16,314 17,306

Made in Germany compressed air. Ammerland Dairy expands with heat recovery technology from KAESER.
Ammerland Dairy:

Quality compressed air for the dairy industry

KAESER oil-free compressors and refrigerated dryers supply compressed control air to the conveyor belts in this large-scale dairy while the selected heat recovery measures save money.

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