Water-cooled oil-free rotary screw compressors

Compact energy-savers

Built for performance in demanding applications, our water-cooled oil-free compressors feature innovative cooling solutions to achieve the lowest possible power consumption.

This, in combination with a Kaeser heat recovery system, allows you to significantly reduce heating costs. Contact us for help tailoring a solution to your needs.

Their compact design and model-specific sized exhaust make them ideal for installations with low ceilings.

Your advantages

  • Low compressed air discharge temperature:
    Cupronickel (CuNi10Fe) cooling pipes with internal star lamella fins provide 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 to 195 °F.
  • Maintenance-friendly:
    The air/water heat exchangers of the low and high pressure stages are housed in separate enclosures, each with large service doors for easy maintenance accessibility.
Life-cycle costs

Our custom consulting services, award-winning product design, and continual investment in our research and development give you superior quality that's tailored for your needs.

 

Take a closer look at our water-cooled oil-free rotary screw compressors

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

Hydraulic inlet valve

Hydraulic inlet valve

The hydraulic inlet valves in Kaeser's oil-free rotary screw compressors are unaffected by contamination and condensate. This makes them more reliable and easier to maintain than pneumatic valves.

Fiber-free pulsation dampeners

Fibre-free pulse damper

Kaeser's new fiber-free pulsation dampeners keep pressure losses to an absolute minimum, help maintain consistent air quality and, unlike fiber versions, eliminate the possibility of compressed air contamination.

Reliable oil reservoir venting

Reliable oil reservoir venting

The microfilter in the oil tank venting system prevents the intake of oil-laden air. This ensures compressed air quality is maintained at all times.

Highly efficient condensate separator

Highly efficient condensate separator

Thanks to its flow-optimized design, the newly developed condensate separator reliably separates the condensate downstream from the air coolers, and 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 amortisation 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 Label [Common - Unit °F] is missing 37 37 37
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 Label [Common - Unit °F] is missing 37 37
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 90-2 SFC W CSG 120-2 SFC W CSG 130-2 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 124 - 417 128 - 381 137 - 331 140 - 306 148 - 469 146 - 467 146 - 445 149 - 420 155 - 476 153 - 474 150 - 473 148 - 472
Max. positive pressure psi 90 145 145 145
Nominal motor output hp 75 100 125
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) 67 68 69
Weight lb 5,368 5,677 5,952

T-SFC version

ModelCSG 90-2 T SFC W CSG 120-2 T SFC W CSG 130-2 T SFC W
Working pressure psi 60 90 125 145 90 125 145 90 125 145
Flow rate Complete system at working pressure acfm 124 - 417 128 - 381 137 - 331 140 - 306 146 - 467 146 - 445 149 - 420 153 - 474 150 - 473 148 - 472
Max. positive pressure psi 90 145 145 145
Nominal motor output hp 75 100 125
Pressure dew point Label [Common - Unit °F] is missing 37 37 37
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) 67 68 69
Weight lb 5,919 6,228 6,504

RD version

ModelCSG 55-2 RD W CSG 70-2 RD W CSG 90-2 RD 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 Label [Common - Unit °F] is missing -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 RD W CSG 130-2 RD 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 Label [Common - Unit °F] is missing -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 90-2 RD SFC W CSG 120-2 RD SFC W CSG 130-2 RD SFC W
Working pressure psi 90 125 145 90 125 145 90 125 145
Flow rate Complete system at working pressure acfm 128 - 381 137 - 331 140 - 306 146 - 467 146 - 445 149 - 420 153 - 474 150 - 473 148 - 472
Max. positive pressure psi 90 145 145 145
Nominal motor output hp 75 100 125
Pressure dew point Label [Common - Unit °F] is missing -9 -26 -30 -7 -22 -28 -7 -22 -26
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) 67 68 69
Weight lb 6,945 7,253 7,529

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 300 3 ANSI class 300 3 ANSI class 300
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 300 3 ANSI class 300
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
Working pressure psi 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
Max. positive pressure psi 100 145 125 145
Nominal motor output hp 150 175
Dimensions W x D x H in 135 x 69 x 81 135 x 69 x 81
Compressed air connection3 ANSI class 300 3 ANSI class 300
Sound pressure level dB(A) 71 72
Weight lb 8,488 8,708

ModelDSG 260-2 SFC W DSG 290-2 SFC W
Working pressure psi 60 90 125 145 60 90 125 145
Flow rate Complete system at working pressure acfm 305 - 967 330 - 966 347 - 911 364 - 858 323 - 1,061 367 - 1,060 418 - 1,058 447 - 1,057
Max. positive pressure psi 110 145 145
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 300 3 ANSI class 300
Sound pressure level dB(A) 75 76
Weight lb 9,039 9,480

RD version

ModelDSG 140-2 RD W DSG 180-2 RD W DSG 220-2 RD 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 Label [Common - Unit °F] is missing -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 300 3 ANSI class 300 3 ANSI class 300
Sound pressure level dB(A) 69 70 71
Weight lb 9,259 9,590 9,811

ModelDSG 260-2 RD W DSG 290-2 RD 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 Label [Common - Unit °F] is missing -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 300 3 ANSI class 300
Sound pressure level dB(A) 74 75
Weight lb 10,141 10,582

RD SFC version

ModelDSG 180-2 RD SFC W DSG 220-2 RD SFC W
Working pressure psi 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
Max. positive pressure psi 100 145 125 145
Nominal motor output hp 150 175
Pressure dew point Label [Common - Unit °F] is missing -14 -29 -33 -15 -30 -33
Dimensions W x D x H in 168 x 69 x 81 168 x 69 x 81
Compressed air connection3 ANSI class 300 3 ANSI class 300
Sound pressure level dB(A) 71 72
Weight lb 10,913 11,133

ModelDSG 260-2 RD SFC W DSG 290-2 RD SFC W
Working pressure psi 90 125 145 90 125 145
Flow rate Complete system at working pressure acfm 330 - 966 347 - 911 364 - 858 367 - 1,060 418 - 1,058 447 - 1,057
Max. positive pressure psi 110 145 145
Nominal motor output hp 200 250
Pressure dew point Label [Common - Unit °F] is missing -15 -29 -33 -14 -29 -32
Dimensions W x D x H in 168 x 69 x 81 168 x 69 x 81
Compressed air connection3 ANSI class 300 3 ANSI class 300
Sound pressure level dB(A) 75 76
Weight lb 11,464 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 141 x 83 x 84 141 x 83 x 84 141 x 83 x 84
Compressed air connection4 ANSI class 300 4 ANSI class 300 4 ANSI class 300
Sound pressure level dB(A) 74 75 76
Weight lb 11,244 11,685 12,236

SFC version

ModelFSG 420-2 SFC W FSG 500-2 SFC W
Working pressure psi 125 145 60 90 125 145
Flow rate Complete system at working pressure acfm 608 - 1,499 653 - 1,400 550 - 1,793 604 - 1,790 666 - 1,788 702 - 1,700
Max. positive pressure psi 145 145
Nominal motor output hp 350 450
Dimensions W x D x H in 149 x 83 x 91 149 x 83 x 91
Compressed air connection4 ANSI class 300 4 ANSI class 300
Sound pressure level dB(A) 77 77
Weight lb 13,999 14,330

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.

Ammerland Dairy reference project