Large rotary screw compressors from 75 to 515 kW


For optimum efficiency and a higher flow rate

Our oil-injected rotary screw compressors from the DSD to HSD series demonstrate their strengths above all in large-scale industrial operations. When large volumes of compressed air are required for your production processes with high levels of energy efficiency and dependability, then rotary screw compressors up to 500 kW are the perfect choice.

The DSD series is optionally available with an add-on dryer, which protects your compressed air lines from corrosion and minimises the risk of damage to the product.
All models are available with or without variable-speed drive (SFC). 

On the HSD series, two compressors are integrated within a single housing. Both units are equipped complete with airend, SIGMA CONTROL controller and individual cooling system. Due to their high flow rates, they are particularly well suited to applications in the automotive or steel industries.

Your benefits

  • Service-friendly design:
    Every system is designed for easy access to all service- and maintenance-relevant parts from the front side of the unit, which saves time and increases availability.
  • Integrated controller for greater efficiency:
    The internal SIGMA CONTROL 2 controller precisely matches the power output of a compressor to the respective compressed air demand, thereby coordinating and optimising the interplay between compressed air generation and consumption.
  • Maximum flexibility with minimal space requirement:
    With the HSD series, two compressors combined within a single enclosure save considerable space as compared to a single compressor unit with the corresponding performance. This system can be optimally adapted to different consumption scenarios, thereby minimising idling periods and increasing efficiency.
 

Our rotary screw compressors up to 515 kW in detail

Save energy with heat recovery
Maximum heat recovery with rotary screw compressors.

A rotary screw compressor converts 100% of the supplied electrical drive energy into heat. Up to 96% of this energy can be recovered and reused for heating purposes. This not only reduces primary energy consumption, but also improves the company’s overall energy balance.

You can find out everything regarding areas of application and potential savings on our heat recovery page. 

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).

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.

Functional diagram - HSD
Component layout of HSD compressed air stations
  1. Air filter
  2. Inlet valve
  3. Electric motor
  4. Rotary screw airend
  5. Separator with cartridge
  1. Fluid filter
  2. Fluid cooler
  3. Aftercooler
  4. Centrifugal separator
  5. ECO-DRAIN condensate drain

The air for compression passes through the intake filter (1) and the inlet valve (2) into the SIGMA PROFILE airend (3). The compressor airend (3) is driven by a high efficiency electric motor (4). The cooling oil injected for cooling purposes during the compression process is re-separated from the air in the fluid separator tank (5). The compressed air flows through the 2-stage oil separator cartridge (6) and the minimum pressure check valve (MDRV) (7) into the compressed air aftercooler (8). 

After cooling, any accumulating condensate is removed from the compressed air by the integrated centrifugal separator (9) and is then drained away from the machine via the installed ECO-DRAIN (10) condensate drain. The condensate-free compressed air then leaves the system at the compressed air connection (11). The heat generated during the compression process is then removed from the cooling oil via the fluid cooler (12) with water heat exchanger. The cooling oil is then cleaned by the ECO fluid filter (13). The Electronic Thermal Management (ETM) system (14) ensures lowest possible operating temperatures. The control cabinet houses the internal SIGMA CONTROL 2 compressor controller and, depending on the design, the star-delta starter or the frequency converter (SFC).

Technical specifications DSD

Standard version

ModelDSD 145 DSD 175 DSD 205
Working pressure bar 7.5 7.5 10 7.5 10 13
Flow rate complete system at working pressure m³/min 14 16.92 13.6 21 16.59 13.06
Max. positive pressure bar 9 8.5 12 8.5 12 15
Nominal motor output kW 75 90 110
Dimensions
W x D x H mm 		2,450 x 1,730 x 2,150 2,450 x 1,730 x 2,150 2,450 x 1,730 x 2,150
Compressed air connectionDN65 PN16 DIN DN65 PN16 DIN DN65 PN16 DIN
Sound pressure level dB(A) 69 70 72
Weight kg 2,950 3,060 3,090 3,360 3,100 3,130

ModelDSD 240
Working pressure bar 7.5 10 13
Flow rate complete system at working pressure m³/min 25.15 20.4 16.15
Max. positive pressure bar 8.5 12 15
Nominal motor output kW 132
Dimensions
W x D x H mm 		2,450 x 1,730 x 2,150
Compressed air connectionDN65 PN16 DIN
Sound pressure level dB(A) 74
Weight kg 3,420 3,430 3,170

T version

ModelDSD 145 T DSD 175 T DSD 205 T
Working pressure bar 7.5 7.5 10 7.5 10 13
Flow rate complete system at working pressure m³/min 14 16.92 13.6 21 16.59 13.06
Max. positive pressure bar 9 8.5 12 8.5 12 15
Nominal motor output kW 75 90 110
Refrigeration dryerABT 250 ABT 250 ABT 250
Dimensions
W x D x H mm 		2,750 x 1,730 x 2,150 2,750 x 1,730 x 2,150 2,750 x 1,730 x 2,150
Compressed air connectionDN65 PN16 DIN DN65 PN16 DIN DN65 PN16 DIN
Sound pressure level dB(A) 69 70 72
Weight kg 3,220 3,330 3,360 3,630 3,370 3,400

ModelDSD 240 T
Working pressure bar 7.5 10 13
Flow rate complete system at working pressure m³/min 25.15 20.4 16.15
Max. positive pressure bar 8.5 12 15
Nominal motor output kW 132
Refrigeration dryerABT 250
Dimensions
W x D x H mm 		2,750 x 1,730 x 2,150
Compressed air connectionDN65 PN16 DIN
Sound pressure level dB(A) 74
Weight kg 3,690 3,700 3,440

SFC version

ModelDSD 145 SFC DSD 175 SFC DSD 205 SFC
Working pressure bar 7.5 7.5 10 7.5 10 13
Flow rate complete system at working pressure m³/min 3.67 - 15.73 3.67 - 18.43 3.5 - 15.6 4.45 - 21.22 4.2 - 18.3 4.97 - 15.16
Max. positive pressure bar 8.5 10 10 15
Nominal motor output kW 75 90 110
Dimensions
W x D x H mm 		2,690 x 1,730 x 2,150 2,690 x 1,730 x 2,150 2,690 x 1,730 x 2,150
Compressed air connectionDN65 PN16 DIN DN65 PN16 DIN DN65 PN16 DIN
Sound pressure level dB(A) 70 71 73
Weight kg 3,190 3,330 3,340 3,370

ModelDSD 240 SFC
Working pressure bar 7.5 10 13
Flow rate complete system at working pressure m³/min 5.57 - 23.47 5.33 - 20.08 4.96 - 16.57
Max. positive pressure bar 8.5 12 15
Nominal motor output kW 132
Dimensions
W x D x H mm 		2,690 x 1,730 x 2,150
Compressed air connectionDN65 PN16 DIN
Sound pressure level dB(A) 75
Weight kg 3,670 3,410 3,440

T-SFC version

ModelDSD 145 T SFC DSD 175 T SFC DSD 205 T SFC
Working pressure bar 7.5 7.5 10 7.5 10 13
Flow rate complete system at working pressure m³/min 3.67 - 15.73 3.67 - 18.43 3.5 - 15.6 4.45 - 21.22 4.2 - 18.3 4.97 - 15.16
Max. positive pressure bar 8.5 10 10 15
Nominal motor output kW 75 90 110
Refrigeration dryerABT 250 ABT 250 ABT 250
Dimensions
W x D x H mm 		2,990 x 1,730 x 2,150 2,990 x 1,730 x 2,150 2,990 x 1,730 x 2,150
Compressed air connectionDN65 PN16 DIN DN65 PN16 DIN DN65 PN16 DIN
Sound pressure level dB(A) 70 71 73
Weight kg 3,470 3,610 3,620 3,650

ModelDSD 240 T SFC
Working pressure bar 7.5 10 13
Flow rate complete system at working pressure m³/min 5.57 - 23.47 5.33 - 20.08 4.96 - 16.57
Max. positive pressure bar 8.5 12 15
Nominal motor output kW 132
Refrigeration dryerABT 250
Dimensions
W x D x H mm 		2,990 x 1,730 x 2,150
Compressed air connectionDN65 PN16 DIN
Sound pressure level dB(A) 75
Weight kg 3,950 3,690 3,720

Add-on refrigeration dryer

ModelABT 250
Power consumption kW 1.8
Pressure dew point °C 3
RefrigerantR-513A
Global warming potential631
Refrigerant volume kg 1.35
Refrigerant mass as CO2 equivalent t 0.9
Hermetic refrigeration circuit-

Technical specifications DSDX

Standard version

ModelDSDX 245 DSDX 305
Working pressure bar 7.5 10 13 7.5 10 13
Flow rate complete system at working pressure m³/min 25.15 20.4 16.15 30.55 24.7 19.78
Max. positive pressure bar 8.5 12 15 8.5 12 15
Nominal motor output kW 132 160
Dimensions
W x D x H mm 		2,690 x 1,910 x 2,140 2,690 x 1,910 x 2,140
Compressed air connectionDN80 PN16 DIN DN80 PN16 DIN
Sound pressure level dB(A) 74 75
Weight kg 3,950 3,962 3,716 4,450 4,018 4,030

SFC version

ModelDSDX 245 SFC DSDX 305 SFC
Working pressure bar 7.5 10 13 7.5 10 13
Flow rate complete system at working pressure m³/min 5.57 - 27.17 5.57 - 23.35 4.95 - 19.27 6.85 - 33.03 5.35 - 28.46 5.18 - 24.01
Max. positive pressure bar 8.5 12 15 8.5 12 15
Nominal motor output kW 132 160
Dimensions
W x D x H mm 		2,940 x 1,910 x 2,140 2,940 x 1,910 x 2,140
Compressed air connectionDN80 PN16 DIN DN80 PN16 DIN
Sound pressure level dB(A) 75 76
Weight kg 4,700 4,454 4,466 4,800 4,812 4,566

Technical specifications ESD

Standard version

ModelESD 375 ESD 445
Working pressure bar 7.5 10 13 7.5 10 13
Flow rate complete system at working pressure m³/min 37.85 30.13 24.34 42.2 37.32 29.67
Max. positive pressure bar 8.5 12 15 8.5 12 15
Nominal motor output kW 200 250
Dimensions
W x D x H mm 		2,960 x 2,030 x 2,140 2,960 x 2,030 x 2,140
Compressed air connectionDN100 PN16 DIN DN100 PN16 DIN
Sound pressure level dB(A) 75 76
Weight kg 5,000 4,880 4,560 5,060 4,940

SFC version

ModelESD 375 SFC ESD 445 SFC
Working pressure bar 7.5 10 13 7.5 10 13
Flow rate complete system at working pressure m³/min 8.6 - 37.6 8.22 - 32.51 6.4 - 27.48 10.6 - 43.2 8.33 - 37.89 7.77 - 31.94
Max. positive pressure bar 8.5 12 15 8.5 12 15
Nominal motor output kW 200 250
Dimensions
W x D x H mm 		3,200 x 2,030 x 2,140 3,200 x 2,030 x 2,140
Compressed air connectionDN100 PN16 DIN DN100 PN16 DIN
Sound pressure level dB(A) 76 77
Weight kg 5,480 5,160 5,170 5,660 5,540 5,220

Technical specifications FSD

Standard version

ModelFSD 475 FSD 575
Working pressure bar 7.5 10 13 7.5 10 13
Flow rate complete system at working pressure m³/min 48.2 37.63 29.52 58.4 47.57 37
Max. positive pressure bar 8.5 12 15 8.5 12 15
Nominal motor output kW 250 315
Dimensions
W x D x H mm 		3,495 x 2,145 x 2,360 3,495 x 2,145 x 2,360
Compressed air connectionDN150 PN16 DIN DN150 PN16 DIN
Sound pressure level dB(A) 79 79
Weight kg 6,580 6,230 6,100 6,750 6,600 6,250

SFC version

ModelFSD 475 SFC FSD 575 SFC
Working pressure bar 7.5 10 7.5 10 13
Flow rate complete system at working pressure m³/min 10.6 - 49.87 9.93 - 44.08 13.33 - 59.83 12.9 - 50.85 11.55 - 45
Max. positive pressure bar 8.5 12 8.5 12 15
Nominal motor output kW 250 315
Dimensions
W x D x H mm 		3,740 x 2,145 x 2,360 3,740 x 2,145 x 2,360
Compressed air connectionDN150 PN16 DIN DN150 PN16 DIN
Sound pressure level dB(A) 79 80
Weight kg 6,930 6,800 7,300 6,950 6,820

Technical specifications HSD

Standard version

ModelHSD 662 HSD 722 HSD 782
Working pressure bar 7.5 10 13 7.5 10 13 7.5 10 13
Flow rate complete system at working pressure m³/min 66.4 54.44 43.72 72.4 59.48 47.87 78.4 65.31 53.07
Max. positive pressure bar 8.5 12 15 8.5 12 15 8.5 12 15
Nominal motor output kW 360 400 450
Dimensions
W x D x H mm 		3,570 x 2,145 x 2,350 3,570 x 2,145 x 2,350 3,570 x 2,145 x 2,350
Compressed air connectionDN150 PN16 DIN DN150 PN16 DIN DN150 PN16 DIN
Sound pressure level dB(A) 71 72 72
Weight kg 8,100 7,481 7,027 8,500 8,202 7,262 8,600 8,434 7,815

ModelHSD 842
Working pressure bar 7.5 10 13
Flow rate complete system at working pressure m³/min 84.4 71.15 58.27
Max. positive pressure bar 8.5 12 15
Nominal motor output kW 500
Dimensions
W x D x H mm 		3,570 x 2,145 x 2,350
Compressed air connectionDN150 PN16 DIN
Sound pressure level dB(A) 73
Weight kg 8,700 8,666 8,368

SFC version

ModelHSD 662 SFC HSD 782 SFC HSD 842 SFC
Working pressure bar 7.5 10 7.5 10 13 7.5 10 13
Flow rate complete system at working pressure m³/min 10.4 - 66.32 8.5 - 57.47 11.9 - 77.83 10 - 65.47 8 - 55.78 11.9 - 87.33 10 - 74.41 8 - 63.44
Max. positive pressure bar 8.5 12 8.5 12 15 8.5 12 15
Nominal motor output kW 382 410 515
Dimensions
W x D x H mm 		4,370 x 2,145 x 2,350 4,370 x 2,145 x 2,350 4,370 x 2,145 x 2,350
Compressed air connectionDN150 PN16 DIN DN150 PN16 DIN DN150 PN16 DIN
Sound pressure level dB(A) 73 74 75
Weight kg 9,100 8,967 9,600 9,113 8,980 10,100 9,934 9,315

Kaeser compressors at Liebherr Australia
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