Oil-free compression rotary screw compressors with water-cooling

Compact energy-savers

Durable yet refined drive and cooling solutions enable us to achieve lowest possible power consumption values.
This, in combination with a Kaeser heat recovery system, also allows you to significantly reduce your heating costs. We'd be glad to help you with a solution that meets your exact needs.
Thanks to their compact design and type-dependant small exhaust air duct, our water-cooled oil-free compression rotary screw compressors earn extra points when it comes to installation in low-ceiling areas.

  • Flow rates from 3.3 to 50.8 m³/min
  • Also available as a peak-load model with variable-speed control and frequency converter (SFC model versions)
  • Also available with integrated i.HOC rotation dryer (DSG-2 series)

Your advantages

  • Extraordinarily low compressed air discharge temperature:
    The tube bundle of the two air/water heat exchangers consists of high-quality CuNi10Fe pipes with welded-on aluminium star profile for optimal heat conduction.
  • 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 90 °C.
  • Maintenance-friendly:
    The air/water heat exchangers of the 1st and 2nd compression stages are housed in two separate enclosures, each with optimal accessibility thanks to large service doors.

Life-cycle costs

Optimal consulting, technically advanced research and development and a global service organisation protect you from system failures.

 

The water-cooled oil-free compression rotary screw compressors in detail

Equipment

Complete package

  • Ready for operation
  • Fully automatic
  • Silenced
  • Vibration-damped
  • Service-friendly design
  • For ambient temperatures up to +45 °C

Airend

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

Drive motor

Super premium efficiency drive motor IE4 logo

  • Internationally renowned SIEMENS manufacture
  • Premium and Super Premium Efficiency Motor
  • Continuous monitoring of motor winding temperature
  • IP 55 protection

Cooling

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

Electrical components

  • Control cabinet to IP 54
  • Switching cabinet ventilation
  • Automatic star-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 modes available 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 hydraulically operated inlet valves in Kaeser oil-free compression rotary screw compressors are unaffected by contamination and condensate. This makes them more reliable and easier to maintain than pneumatic valves.

Fibre-free pulse dampers

Fibre-free pulse damper

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

Reliable oil reservoir venting

Reliable oil reservoir venting

The microfilter in the oil tank venting system prevents the intake of oil-laden air – a key detail to ensure that compressed air quality is reliably maintained at all times.

Highly efficient condensate separator

Highly efficient condensate separator

Thanks to its flow-optimised 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 to bolt the machine to the floor

Heat recovery

  • Integrated heat exchanger system comprising parallel switched tube-type heat exchanger, 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 desired 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 bar 6 8 4 6 8 4 6 8 10
Flow rate Complete system at working pressure m³/min 5.63 5.57 9.05 7.92 6.82 10.67 9.78 8.97 7.83
Max. positive pressure bar 8 4 6 8 4 6 8 10
Nominal motor output kW 37 45 55
Dimensions W x D x H mm 2,490 x 1,660 x 1,965 2,490 x 1,660 x 1,965 2,490 x 1,660 x 1,965
Compressed air connectionDN65 PN16 DIN DN65 PN16 DIN DN65 PN16 DIN
Sound pressure level dB(A) 64 64 65
Weight kg 2,270 2,310 2,375

ModelCSG 120-2 W CSG 130-2 W
Working pressure bar 4 6 8 10 6 8 10
Flow rate Complete system at working pressure m³/min 13.01 13.07 12.15 10.58 13.07 13.03 13
Max. positive pressure bar 6 8 10 8 10
Nominal motor output kW 75 90
Dimensions W x D x H mm 2,490 x 1,660 x 1,965 2,490 x 1,660 x 1,965
Compressed air connectionDN65 PN16 DIN DN65 PN16 DIN
Sound pressure level dB(A) 66 68
Weight kg 2,515 2,640

T version

ModelCSG 55-2 T W CSG 70-2 T W CSG 90-2 T W
Working pressure bar 6 8 4 6 8 4 6 8 10
Flow rate Complete system at working pressure m³/min 5.63 5.57 9.05 7.92 6.82 10.67 9.78 8.97 7.83
Max. positive pressure bar 8 4 6 8 4 6 8 10
Nominal motor output kW 37 45 55
Pressure dew point °C 3 3 3
Dimensions W x D x H mm 2,840 x 1,660 x 1,965 2,840 x 1,660 x 1,965 2,840 x 1,660 x 1,965
Compressed air connectionDN65 PN16 DIN DN65 PN16 DIN DN65 PN16 DIN
Sound pressure level dB(A) 64 64 65
Weight kg 2,520 2,560 2,625

ModelCSG 120-2 T W CSG 130-2 T W
Working pressure bar 4 6 8 10 6 8 10
Flow rate Complete system at working pressure m³/min 13.01 13.07 12.15 10.58 13.07 13.03 13
Max. positive pressure bar 6 8 10 8 10
Nominal motor output kW 75 90
Pressure dew point °C 3 3
Dimensions W x D x H mm 2,840 x 1,660 x 1,965 2,840 x 1,660 x 1,965
Compressed air connectionDN65 PN16 DIN DN65 PN16 DIN
Sound pressure level dB(A) 66 68
Weight kg 2,765 2,890

SFC version

ModelCSG 90-2 SFC W CSG 120-2 SFC W CSG 130-2 SFC W
Working pressure bar 4 6 8 10 4 6 8 10 4 6 8 10
Flow rate Complete system at working pressure m³/min 3.49 - 10.85 3.62 - 9.77 3.84 - 8.58 3.96 - 7.57 4.2 - 13.27 4.18 - 12.61 4.21 - 11.56 4.23 - 10.52 4.4 - 13.48 4.33 - 13.44 4.26 - 13.4 4.2 - 13.02
Max. positive pressure bar 6 10 10 10
Nominal motor output kW 55 75 90
Dimensions W x D x H mm 2,490 x 1,660 x 1,965 2,490 x 1,660 x 1,965 2,490 x 1,660 x 1,965
Compressed air connectionDN65 PN16 DIN DN65 PN16 DIN DN65 PN16 DIN
Sound pressure level dB(A) 65 66 68
Weight kg 2,435 2,575 2,700

T-SFC version

ModelCSG 90-2 T SFC W CSG 120-2 T SFC W CSG 130-2 T SFC W
Working pressure bar 4 6 8 10 4 6 8 10 4 6 8 10
Flow rate Complete system at working pressure m³/min 3.49 - 10.85 3.62 - 9.77 3.84 - 8.58 3.96 - 7.57 4.2 - 13.27 4.18 - 12.61 4.21 - 11.56 4.23 - 10.52 4.4 - 13.48 4.33 - 13.44 4.26 - 13.4 4.2 - 13.02
Max. positive pressure bar 6 10 10 10
Nominal motor output kW 55 75 90
Pressure dew point °C 3 3 3
Dimensions W x D x H mm 2,840 x 1,660 x 1,965 2,840 x 1,660 x 1,965 2,840 x 1,660 x 1,965
Compressed air connectionDN65 PN16 DIN DN65 PN16 DIN DN65 PN16 DIN
Sound pressure level dB(A) 65 66 68
Weight kg 2,685 2,825 2,950

RD version

ModelCSG 55-2 RD W CSG 70-2 RD W CSG 90-2 RD W
Working pressure bar 6 8 6 8 6 8 10
Flow rate Complete system at working pressure m³/min 5.63 5.57 7.92 6.82 9.78 8.97 7.83
Max. positive pressure bar 8 6 8 6 8 10
Nominal motor output kW 37 45 55
Pressure dew point °C -27 -33 -25 -32 -23 -31 -35
Dimensions W x D x H mm 3,140 x 1,660 x 1,965 3,140 x 1,660 x 1,965 3,140 x 1,660 x 1,965
Compressed air connectionDN65 PN16 DIN DN65 PN16 DIN DN65 PN16 DIN
Sound pressure level dB(A) 64 64 65
Weight kg 2,985 3,025 3,090

ModelCSG 120-2 RD W CSG 130-2 RD W
Working pressure bar 4 6 8 10 6 8 10
Flow rate Complete system at working pressure m³/min 13.01 13.07 12.15 10.58 13.07 13.03 13
Max. positive pressure bar 6 8 10 8 10
Nominal motor output kW 75 90
Pressure dew point °C -3 -20 -29 -34 -19 -28 -33
Dimensions W x D x H mm 3,140 x 1,660 x 1,965 3,140 x 1,660 x 1,965
Compressed air connectionDN65 PN16 DIN DN65 PN16 DIN
Sound pressure level dB(A) 66 68
Weight kg 3,230 3,355

RD SFC version

ModelCSG 90-2 RD SFC W CSG 120-2 RD SFC W CSG 130-2 RD SFC W
Working pressure bar 4 6 8 10 4 6 8 10 4 6 8 10
Flow rate Complete system at working pressure m³/min 3.49 - 10.85 3.62 - 9.77 3.84 - 8.58 3.96 - 7.57 4.2 - 13.27 4.18 - 12.61 4.21 - 11.56 4.23 - 10.52 4.4 - 13.48 4.33 - 13.44 4.26 - 13.4 4.2 - 13.02
Max. positive pressure bar 6 10 10 10
Nominal motor output kW 55 75 90
Pressure dew point °C -6 -23 -31 -35 -2 -21 -29 -34 -2 -21 -28 -33
Dimensions W x D x H mm 3,140 x 1,660 x 1,965 3,140 x 1,660 x 1,965 3,140 x 1,660 x 1,965
Compressed air connectionDN65 PN16 DIN DN65 PN16 DIN DN65 PN16 DIN
Sound pressure level dB(A) 65 66 68
Weight kg 3,150 3,290 3,415

Technical specifications DSG-2 W

Standard version

ModelDSG 140-2 W DSG 180-2 W DSG 220-2 W
Working pressure bar 8 10 4 6 8 10 4 6 8 10
Flow rate Complete system at working pressure m³/min 13.18 13.12 21.7 19.2 18.4 16.1 26.15 23 21.6 19.1
Max. positive pressure bar 8 10 4 6 8 10 4 6 8 10
Nominal motor output kW 90 110 132
Dimensions W x D x H mm 3,435 x 1,750 x 2,060 3,435 x 1,750 x 2,060 3,435 x 1,750 x 2,060
Compressed air connectionDN80 PN16 DIN DN80 PN16 DIN DN80 PN16 DIN
Sound pressure level dB(A) 69 70 71
Weight kg 3,100 3,250 3,350

ModelDSG 260-2 W DSG 290-2 W
Working pressure bar 4 6 8 10 4 6 8 10
Flow rate Complete system at working pressure m³/min 28.61 26.1 26 22.9 28.6 28.55 28.5 26
Max. positive pressure bar 4 8 10 8 10
Nominal motor output kW 160 200
Dimensions W x D x H mm 3,435 x 1,750 x 2,060 3,435 x 1,750 x 2,060
Compressed air connectionDN80 PN16 DIN DN80 PN16 DIN
Sound pressure level dB(A) 74 75
Weight kg 3,500 3,700

SFC version

ModelDSG 180-2 SFC W DSG 220-2 SFC W
Working pressure bar 4 6 8 10 4 6 8 10
Flow rate Complete system at working pressure m³/min 8.58 - 22.52 9.46 - 20.79 8.51 - 18.56 9.54 - 16.43 7.84 - 22.51 8.68 - 22.45 9.51 - 21.8 9.95 - 19.5
Max. positive pressure bar 6 10 8.5 10
Nominal motor output kW 110 132
Dimensions W x D x H mm 3,435 x 1,750 x 2,060 3,435 x 1,750 x 2,060
Compressed air connectionDN80 PN16 DIN DN80 PN16 DIN
Sound pressure level dB(A) 71 72
Weight kg 3,850 3,950

ModelDSG 260-2 SFC W DSG 290-2 SFC W
Working pressure bar 4 6 8 10 4 6 8 10
Flow rate Complete system at working pressure m³/min 8.59 - 27.71 9.36 - 27.66 9.62 - 25.44 10.3 - 23.3 9.07 - 30.09 10.27 - 30.05 11.47 - 30 12.33 - 28
Max. positive pressure bar 7 10 8.5 10
Nominal motor output kW 160 200
Dimensions W x D x H mm 3,435 x 1,750 x 2,060 3,435 x 1,750 x 2,060
Compressed air connectionDN80 PN16 DIN DN80 PN16 DIN
Sound pressure level dB(A) 75 76
Weight kg 4,100 4,300

RD version

ModelDSG 140-2 RD W DSG 180-2 RD W DSG 220-2 RD W
Working pressure bar 8 10 6 8 10 6 8 10
Flow rate Complete system at working pressure m³/min 13.18 13.12 19.2 18.4 16.1 23 21.6 19.1
Max. positive pressure bar 8 10 6 8 10 6 8 10
Nominal motor output kW 90 110 132
Pressure dew point °C -32 -36 -24 -33 -36 -24 -33 -36
Dimensions W x D x H mm 4,270 x 1,750 x 2,060 4,270 x 1,750 x 2,060 4,270 x 1,750 x 2,060
Compressed air connectionDN80 PN16 DIN DN80 PN16 DIN DN80 PN16 DIN
Sound pressure level dB(A) 69 70 71
Weight kg 4,200 4,350 4,450

ModelDSG 260-2 RD W DSG 290-2 RD W
Working pressure bar 6 8 10 6 8 10
Flow rate Complete system at working pressure m³/min 26.1 26 22.9 28.55 28.5 26
Max. positive pressure bar 8 10 8 10
Nominal motor output kW 160 200
Pressure dew point °C -25 -33 -36 -24 -33 -36
Dimensions W x D x H mm 4,270 x 1,750 x 2,060 4,270 x 1,750 x 2,060
Compressed air connectionDN80 PN16 DIN DN80 PN16 DIN
Sound pressure level dB(A) 74 75
Weight kg 4,600 4,800

RD SFC version

ModelDSG 180-2 RD SFC W DSG 220-2 RD SFC W
Working pressure bar 6 8 10 6 8 10
Flow rate Complete system at working pressure m³/min 9.46 - 20.79 8.51 - 18.56 9.54 - 16.43 8.68 - 22.45 9.51 - 21.8 9.95 - 19.5
Max. positive pressure bar 6 10 8.5 10
Nominal motor output kW 110 132
Pressure dew point °C -24 -32 -36 -25 -33 -36
Dimensions W x D x H mm 4,270 x 1,750 x 2,060 4,270 x 1,750 x 2,060
Compressed air connectionDN80 PN16 DIN DN80 PN16 DIN
Sound pressure level dB(A) 71 72
Weight kg 4,950 5,050

ModelDSG 260-2 RD SFC W DSG 290-2 RD SFC W
Working pressure bar 6 8 10 6 8 10
Flow rate Complete system at working pressure m³/min 9.36 - 27.66 9.62 - 25.44 10.3 - 23.3 10.27 - 30.05 11.47 - 30 12.33 - 28
Max. positive pressure bar 7 10 8.5 10
Nominal motor output kW 160 200
Pressure dew point °C -25 -33 -36 -25 -33 -36
Dimensions W x D x H mm 4,270 x 1,750 x 2,060 4,270 x 1,750 x 2,060
Compressed air connectionDN80 PN16 DIN DN80 PN16 DIN
Sound pressure level dB(A) 75 76
Weight kg 5,200 5,400

Technical specifications FSG-2 W

Standard version

ModelFSG 300-2 W FSG 350-2 W FSG 420-2 W
Working pressure bar 4 6 8 4 6 8 10 4 6 8 10
Flow rate Complete system at working pressure m³/min 35.12 29.4 29.3 42.15 37.3 34.9 29.2 50.14 45.7 42 37.1
Max. positive pressure bar 4 8 4 6 8 10 4 6 8 10
Nominal motor output kW 160 200 250
Dimensions W x D x H mm 3,190 x 2,095 x 2,135 3,190 x 2,095 x 2,135 3,190 x 2,095 x 2,135
Compressed air connectionDN125 PN16 DIN DN125 PN16 DIN DN125 PN16 DIN
Sound pressure level dB(A) 74 75 75
Weight kg 5,100 5,300 5,550

ModelFSG 450-2 W FSG 500-2 W
Working pressure bar 6 8 10 8 10
Flow rate Complete system at working pressure m³/min 50.1 45.6 41.9 50 45.6
Max. positive pressure bar 6 8 10 8 10
Nominal motor output kW 315 315
Dimensions W x D x H mm 3,190 x 2,095 x 2,135 3,190 x 2,095 x 2,135
Compressed air connectionDN125 PN16 DIN DN125 PN16 DIN
Sound pressure level dB(A) 75 76
Weight kg 5,700 5,700

ModelFSG 520-2 W
Working pressure bar 10
Flow rate Complete system at working pressure m³/min 50
Max. positive pressure bar 10
Nominal motor output kW 355
Dimensions W x D x H mm 3,190 x 2,095 x 2,135
Compressed air connectionDN125 PN16 DIN
Sound pressure level dB(A) 76
Weight kg 5,900

SFC version

ModelFSG 420-2 SFC W FSG 500-2 SFC W
Working pressure bar 4 6 8 10 4 6 8 10
Flow rate Complete system at working pressure m³/min 12.95 - 48.53 14.79 - 44.56 16.63 - 40.57 18.48 - 36.54 15.48 - 50.77 16.94 - 50.7 18.41 - 47.53 19.88 - 43.57
Max. positive pressure bar 10 10
Nominal motor output kW 250 315
Dimensions W x D x H mm 3,790 x 2,095 x 2,315 3,790 x 2,095 x 2,315
Compressed air connectionDN125 PN16 DIN DN125 PN16 DIN
Sound pressure level dB(A) 76 77
Weight kg 6,350 6,500

ModelFSG 520-2 SFC W
Working pressure bar 4 6 8 10
Flow rate Complete system at working pressure m³/min 15.48 - 50.77 16.94 - 50.7 18.41 - 50.64 19.88 - 50.57
Max. positive pressure bar 10
Nominal motor output kW 355
Dimensions W x D x H mm 3,790 x 2,095 x 2,315
Compressed air connectionDN125 PN16 DIN
Sound pressure level dB(A) 77
Weight kg 6,750

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

Quality compressed air for the dairy industry

KAESER dry-running compressors and refrigeration dryers supply compressed control air to the conveyor belts in this large-scale dairy whilst the selected heat recovery measures save money.

Ammerland Dairy reference project