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 4.2 to 51 m³/min
  • Also available as a peak load model with variable speed control and frequency converter (SFC model versions)
  • 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 +90°C.
  • 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 optimise 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 optimised air inlet and outlet.

The flow-optimised 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

Energy efficiency is paramount
Save with KAESER life-cycle management

The purchase price and service costs account for just a fraction of the total lifetime cost of a compressor. Energy accounts for the lion's share of the system’s costs. As a leading compressed air systems provider, we offer individual planning tailored to your exact needs, an energy-efficient compressed air station and reliable service. We are there to partner you throughout the entire service life of your compressed air station.

Efficient and reliable operation
SIGMA CONTROL 2 compressor controller

The integrated SIGMA CONTROL 2 controller coordinates compressed air generation and ensures efficient, reliable machine operation. Moreover, it guarantees perfect interaction within the integrated system as a whole. All relevant components and operating states are monitored and evaluated. A multitude of communications functions are available to the operator, including the option of connecting the machine to other control technology (SCADA).

Quality in detail

Fibre-free pulse dampers

Fibre-free pulsation dampers

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.

Highly efficient condensate separator

High-efficiency 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.

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.

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.
Technical specifications CSG W

Standard version

ModelCSG 60 W CSG 75 W CSG 95 W
Working pressure bar 6 8.6 11 6 8.6 11 6 8.6 11
Flow rate complete system at working pressure m³/min 6.99 5.79 4.93 8.41 7.3 6.31 10.08 8.96 7.67
Max. positive pressure bar 6 8.6 11 6 8.6 11 6 8.6 11
Nominal motor output kW 37 45 55
Dimensions
W x D x H mm 		2,200 x 1,530 x 1,960 2,200 x 1,530 x 1,960 2,200 x 1,530 x 1,960
Compressed air connectionDN65 PN16 DIN DN65 PN16 DIN DN65 PN16 DIN
Sound pressure level dB(A) 65 66 67
Weight kg 2,500 2,550 2,550

ModelCSG 125 W CSG 150 W
Working pressure bar 6 8.6 11 6 8.6 11
Flow rate complete system at working pressure m³/min 13.55 12.45 11.5 15.3 14.73 13.64
Max. positive pressure bar 6 8.6 11 6 8.6 11
Nominal motor output kW 75 90
Dimensions
W x D x H mm 		2,200 x 1,530 x 1,960 2,200 x 1,530 x 1,960
Compressed air connectionDN65 PN16 DIN DN65 PN16 DIN
Sound pressure level dB(A) 68 69
Weight kg 2,550 2,800

SFC version

ModelCSG 75 W SFC CSG 95 W SFC CSG 125 W SFC
Working pressure bar 6 8.6 6 8.6 11 6 8.6 11
Flow rate complete system at working pressure m³/min 4.24 - 8.56 4.22 - 7.28 4.94 - 9.96 4.93 - 9.03 4.93 - 8.15 5.43 - 13.68 5.42 - 12.26 5.15 - 10.92
Max. positive pressure bar 8.6 8.6 11 8.6 11
Nominal motor output kW 55 55 75 75
Dimensions
W x D x H mm 		2,200 x 1,530 x 1,960 2,200 x 1,530 x 1,960 2,200 x 1,530 x 1,960
Compressed air connectionDN65 PN16 DIN DN65 PN16 DIN DN65 PN16 DIN
Sound pressure level dB(A) 67 68 69
Weight kg 2,500 2,500 2,550 2,550

ModelCSG 150 W SFC
Working pressure bar 6 8.6 11
Flow rate complete system at working pressure m³/min 5.44 - 16.4 5.42 - 14.82 5.41 - 13.6
Max. positive pressure bar 6 8.6 11
Nominal motor output kW 90
Dimensions
W x D x H mm 		2,200 x 1,530 x 1,960
Compressed air connectionDN65 PN16 DIN
Sound pressure level dB(A) 70
Weight kg 2,600

RD version

ModelCSG 60 W i.HOC CSG 75 W i.HOC CSG 95 W i.HOC
Working pressure bar 6 8.6 11 6 8.6 11 6 8.6 11
Flow rate complete system at working pressure m³/min 6.99 5.79 4.93 8.41 7.3 6.31 10.08 8.96 7.67
Max. positive pressure bar 6 8.6 11 6 8.6 11 6 8.6 11
Nominal motor output kW 37 45 55
Pressure dew point °C - - -
Dimensions
W x D x H mm 		2,900 x 1,530 x 1,960 2,900 x 1,530 x 1,960 2,900 x 1,530 x 1,960
Compressed air connectionDN65 PN16 DIN DN65 PN16 DIN DN65 PN16 DIN
Sound pressure level dB(A) 65 66 67
Weight kg 3,200 3,250 3,250

ModelCSG 125 W i.HOC CSG 150 W i.HOC
Working pressure bar 6 8.6 11 6 8.6 11
Flow rate complete system at working pressure m³/min 13.55 12.45 11.5 15.3 14.73 13.64
Max. positive pressure bar 6 8.6 11 6 8.6 11
Nominal motor output kW 75 90
Pressure dew point °C - -
Dimensions
W x D x H mm 		2,900 x 1,530 x 1,960 2,900 x 1,530 x 1,960
Compressed air connectionDN65 PN16 DIN DN65 PN16 DIN
Sound pressure level dB(A) 68 69
Weight kg 3,250 3,500

RD SFC version

ModelCSG 75 W SFC i.HOC CSG 95 W SFC i.HOC CSG 125 W SFC i.HOC
Working pressure bar 6 8.6 6 8.6 11 6 8.6 11
Flow rate complete system at working pressure m³/min 4.24 - 8.58 4.22 - 7.28 4.94 - 9.96 4.93 - 9.03 4.93 - 8.15 5.43 - 13.69 5.42 - 12.26 5.15 - 10.92
Max. positive pressure bar 8.6 8.6 11 8.6 11
Nominal motor output kW 55 55 75 75
Pressure dew point °C - - -
Dimensions
W x D x H mm 		2,900 x 1,530 x 1,960 2,900 x 1,530 x 1,960 2,900 x 1,530 x 1,960
Compressed air connectionDN65 PN16 DIN DN65 PN16 DIN DN65 PN16 DIN
Sound pressure level dB(A) 67 68 69
Weight kg 3,200 3,200 3,250 3,250

ModelCSG 150 W SFC i.HOC
Working pressure bar 6 8.6 11
Flow rate complete system at working pressure m³/min 5.44 - 16.41 5.42 - 14.84 5.41 - 13.6
Max. positive pressure bar 6 8.6 11
Nominal motor output kW 90
Pressure dew point °C -
Dimensions
W x D x H mm 		2,900 x 1,530 x 1,960
Compressed air connectionDN65 PN16 DIN
Sound pressure level dB(A) 70
Weight kg 3,300

Add-on refrigeration dryer

ModelABT 130 ABT 150
Power consumption kW 1.38 1.35
Pressure dew point °C 3 3
RefrigerantR-513A R-513A
Global warming potential631 631
Refrigerant volume kg 1.5 1.1
Refrigerant mass as CO2 equivalent t 0.9 0.69
Hermetic refrigeration circuit- -

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 DSG 260-2 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 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 8.59 - 27.71 9.36 - 27.66 9.62 - 25.44 10.3 - 23.3
Max. positive pressure bar 6 10 8.5 10 7 10
Nominal motor output kW 110 132 160
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) 71 72 75
Weight kg 3,850 3,950 4,100

ModelDSG 290-2 SFC W
Working pressure bar 4 6 8 10
Flow rate complete system at working pressure m³/min 9.07 - 30.09 10.27 - 30.05 11.47 - 30 12.33 - 28
Max. positive pressure bar 8.5 10
Nominal motor output kW 200
Dimensions
W x D x H mm 		3,435 x 1,750 x 2,060
Compressed air connectionDN80 PN16 DIN
Sound pressure level dB(A) 76
Weight kg 4,300

RD version

ModelDSG 140-2 i.HOC W DSG 180-2 i.HOC W DSG 220-2 i.HOC 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 i.HOC W DSG 290-2 i.HOC 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 i.HOC SFC W DSG 220-2 i.HOC SFC W DSG 260-2 i.HOC SFC W
Working pressure bar 6 8 10 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 9.36 - 27.66 9.62 - 25.44 10.3 - 23.3
Max. positive pressure bar 6 10 8.5 10 7 10
Nominal motor output kW 110 132 160
Pressure dew point °C -24 -32 -36 -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 4,270 x 1,750 x 2,060
Compressed air connectionDN80 PN16 DIN DN80 PN16 DIN DN80 PN16 DIN
Sound pressure level dB(A) 71 72 75
Weight kg 4,950 5,050 5,200

ModelDSG 290-2 i.HOC SFC W
Working pressure bar 6 8 10
Flow rate complete system at working pressure m³/min 10.27 - 30.05 11.47 - 30 12.33 - 28
Max. positive pressure bar 8.5 10
Nominal motor output kW 200
Pressure dew point °C -25 -33 -36
Dimensions
W x D x H mm 		4,270 x 1,750 x 2,060
Compressed air connectionDN80 PN16 DIN
Sound pressure level dB(A) 76
Weight kg 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 		3,650 x 2,075 x 2,220 3,650 x 2,075 x 2,220 3,650 x 2,075 x 2,220
Compressed air connectionDN150 PN16 DIN DN150 PN16 DIN DN150 PN16 DIN
Sound pressure level dB(A) 74 75 75
Weight kg 5,250 5,450 5,650

ModelFSG 450-2 W FSG 500-2 W FSG 520-2 W
Working pressure bar 6 8 10 8 10 10
Flow rate complete system at working pressure m³/min 50.1 45.6 41.9 50 45.6 50
Max. positive pressure bar 6 8 10 8 10 10
Nominal motor output kW 315 315 355
Dimensions
W x D x H mm 		3,650 x 2,075 x 2,220 3,650 x 2,075 x 2,220 3,650 x 2,075 x 2,220
Compressed air connectionDN150 PN16 DIN DN150 PN16 DIN DN150 PN16 DIN
Sound pressure level dB(A) 75 76 77
Weight kg 5,950 5,950 6,550

SFC version

ModelFSG 420-2 SFC W FSG 500-2 SFC W FSG 520-2 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 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 15.48 - 50.77 16.94 - 50.7 18.41 - 50.64 19.88 - 50.57
Max. positive pressure bar 10 10 10
Nominal motor output kW 250 315 355
Dimensions
W x D x H mm 		3,650 x 2,075 x 2,220 3,650 x 2,075 x 2,220 3,650 x 2,075 x 2,220
Compressed air connectionDN150 PN16 DIN DN150 PN16 DIN DN150 PN16 DIN
Sound pressure level dB(A) 76 77 78
Weight kg 6,250 6,700 7,300

RD version

ModelFSG 300-2 i.HOC W FSG 350-2 i.HOC W FSG 420-2 i.HOC W
Working pressure bar 6 8 6 8 10 6 8 10
Flow rate complete system at working pressure m³/min 29.4 29.3 37.3 34.9 29.2 45.7 42 37.1
Max. positive pressure bar 8 6 8 10 6 8 10
Nominal motor output kW 160 200 250
Pressure dew point °C -22 -30 -22 -31 -35 -22 -31 -35
Dimensions
W x D x H mm 		4,475 x 2,075 x 2,220 4,475 x 2,075 x 2,220 4,475 x 2,075 x 2,220
Compressed air connectionDN150 PN16 DIN DN150 PN16 DIN DN150 PN16 DIN
Sound pressure level dB(A) 74 75 75
Weight kg 6,400 6,600 6,800

ModelFSG 450-2 i.HOC W FSG 500-2 i.HOC W FSG 520-2 i.HOC W
Working pressure bar 6 8 10 8 10 10
Flow rate complete system at working pressure m³/min 50.1 45.6 41.9 50 45.6 50
Max. positive pressure bar 6 8 10 8 10 10
Nominal motor output kW 315 315 355
Pressure dew point °C -22 -31 -35 -31 -35 -35
Dimensions
W x D x H mm 		4,475 x 2,075 x 2,220 4,475 x 2,075 x 2,220 4,475 x 2,075 x 2,220
Compressed air connectionDN150 PN16 DIN DN150 PN16 DIN DN150 PN16 DIN
Sound pressure level dB(A) 75 76 77
Weight kg 7,100 7,100 7,700

RD SFC version

ModelFSG 420-2 i.HOC SFC W FSG 500-2 i.HOC SFC W FSG 520-2 i.HOC SFC W
Working pressure bar 6 8 10 6 8 10 6 8 10
Flow rate complete system at working pressure m³/min 14.79 - 44.56 16.63 - 40.57 18.48 - 36.54 16.94 - 50.7 18.41 - 47.53 19.88 - 43.57 16.94 - 50.7 18.41 - 50.64 19.88 - 50.57
Max. positive pressure bar 10 10 10
Nominal motor output kW 250 315 355
Pressure dew point °C -25 -31 -35 -23 -30 -35 -23 -30 -35
Dimensions
W x D x H mm 		4,475 x 2,075 x 2,220 4,475 x 2,075 x 2,220 4,475 x 2,075 x 2,220
Compressed air connectionDN150 PN16 DIN DN150 PN16 DIN DN150 PN16 DIN
Sound pressure level dB(A) 76 77 78
Weight kg 7,400 7,850 8,450

Kaeser compressors at Tatural Milk Industries
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The more challenging, the better!

From the smallest to the largest application, Kaeser customers can rely on decades of engineering experience in finding the right solution. See for yourself.

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