Large rotary screw compressors from 100 to 700 hp


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 700 hp are the perfect choice.

The DSD series is optionally available with an add-on dryer, which protects your compressed air lines from corrosion and minimizes 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 optimizing 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 minimizing idling periods and increasing efficiency.
 

Our rotary screw compressors up to 700 hp 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 125 DSD 150 DSD 175
Working pressure psi 110 125 110 125 175 110 125 175 217
Flow rate complete system at working pressure acfm 600 595 721 717 568 888 882 695 544
Max. positive pressure psi 130 125 175 125 175 217
Nominal motor output hp 125 150 175
Dimensions
W x D x H in 		97 x 68 x 85 97 x 68 x 85 97 x 68 x 85
Compressed air connection2½ ANSI class 150 2½ ANSI class 150 2½ ANSI class 150
Sound pressure level dB(A) 71 73 75
Weight lb 6,812 6,834 6,900 7,562 6,989 7,055

T version

ModelDSD 125 T DSD 150 T DSD 175 T
Working pressure psi 110 125 110 125 175 110 125 175 217
Flow rate complete system at working pressure acfm 600 595 721 717 568 888 882 695 544
Max. positive pressure psi 130 125 175 125 175 217
Nominal motor output hp 125 150 175
Refrigerated dryerABT 250 ABT 250 ABT 250
Dimensions
W x D x H in 		108 x 68 x 85 108 x 68 x 85 108 x 68 x 85
Compressed air connection2½ ANSI class 150 2½ ANSI class 150 2½ ANSI class 150
Sound pressure level dB(A) 71 73 75
Weight lb 7,408 7,430 7,496 8,157 7,584 7,650

Add-on refrigerated dryer

ModelABT 250
Power consumption3
Pressure dew point °F 37
RefrigerantR-513A
Global warming potential — 631
Refrigerant volume lb 2.98
Refrigerant mass as CO2 equivalent t 0.9
Hermetic refrigeration circuit-

Technical specifications DSD

Standard version

ModelDSD 200 DSD 250
Working pressure psi 125 175 217 125 175 217
Flow rate complete system at working pressure acfm 882 695 544 1,052 854 678
Max. positive pressure psi 125 175 217 125 175 217
Nominal motor output hp 200 250
Dimensions
W x D x H in 		106 x 75 x 84 106 x 75 x 84
Compressed air connection3 ANSI class 150 3 ANSI class 150
Sound pressure level dB(A) 75 75
Weight lb 8,735 8,192 8,219 8,858 8,885 8,342

Technical specifications ESD

Standard version

ModelESD 250 ESD 300
Working pressure psi 125 175 217 125 175 217
Flow rate complete system at working pressure acfm 1,278 1,041 820 1,571 1,260 1,007
Max. positive pressure psi 125 175 217 125 175 217
Nominal motor output hp 250 350
Dimensions
W x D x H in 		117 x 80 x 84 117 x 80 x 84
Compressed air connection4 ANSI class 150 4 ANSI class 150
Sound pressure level dB(A) 76 77
Weight lb 10,759 10,053 10,075 11,155 10,891 10,185

Technical specifications FSD

Standard version

ModelFSD 350 FSD 450
Working pressure psi 125 145 175 125 145 175 217
Flow rate complete system at working pressure acfm 1,596 1,276 1,264 2,030 1,584 1,567 1,243
Max. positive pressure psi 125 175 125 175 217
Nominal motor output hp 350 450
Dimensions
W x D x H in 		138 x 85 x 93 138 x 85 x 93
Compressed air connection6 ANSI class 150 6 ANSI class 150
Sound pressure level dB(A) 79 80
Weight lb 13,735 13,448 14,551 13,779 13,492

Technical specifications HSD

Standard version

ModelHSD 500 HSD 550 HSD 600
Working pressure psi 110 175 110 175 217 110 175 217
Flow rate complete system at working pressure acfm 2,326 1,885 2,534 2,062 1,654 2,775 2,266 1,830
Max. positive pressure psi 125 175 125 175 217 125 175 217
Nominal motor output hp 500 550 650
Dimensions
W x D x H in 		141 x 85 x 93 141 x 85 x 93 141 x 85 x 93
Compressed air connection6 ANSI class 150 6 ANSI class 150 6 ANSI class 150
Sound pressure level dB(A) 73 74 74
Weight lb 16,493 15,492 18,082 16,010 16,081 18,594 17,229 16,228

ModelHSD 650
Working pressure psi 110 175 217
Flow rate complete system at working pressure acfm 3,015 2,471 2,007
Max. positive pressure psi 125 175 217
Nominal motor output hp 700
Dimensions
W x D x H in 		141 x 85 x 93
Compressed air connection6 ANSI class 150
Sound pressure level dB(A) 75
Weight lb 19,105 18,448 16,376

Vallourec
A great success!

Compressed air for safety

Kaeser rotary screw compressors ensure reliable and energy-efficient production of giant steel tubes weighing tons at Vallourec.

Reference project: Vallourec
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