Kaeser's 650-hp rotary screw air compressors in the HSD series are engineered to be the cornerstone of any demanding industrial application requiring large volumes of air. Each HSD contains two independently operating compressors in a single enclosure. These innovative water-cooled compressor packages provide the energy efficiency of load splitting in a much smaller footprint than two separate compressors of equal capacity. Because each module is a complete compressor, you have all the benefits of built-in redundancy coupled with lower installation costs.
650 HP Air Compressor: Functional Diagram
- Air filter
- Inlet valve
- Electric motor
- Rotary screw airend
- Separator with cartridge
- Fluid filter
- Fluid cooler
- Aftercooler
- Centrifugal separator
- 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).
650 hp Screw Compressors: HSD Series
Dual Direct-Drive Units
| Model |
Flow (cfm) |
Dimensions W x D x H (in) |
Weight (lb) |
Noise level (dB(A)) |
| 125 psig |
175 psig |
217 psig |
| HSD 600 |
2760 |
2266 |
1830 |
141 x 85 x 93 |
18,594 |
74 |
- Package water-cooled as standard: Fluid and compressed air aftercooler with plate-type heat exchanger. Shell and tube heat exchanger available as an option.
- Super soundproofing
- Vibration-dampening
- All panels powder-coated
- For ambient temperatures up to +115 °F
- Service-friendly design: External lubrication for motor bearings
- Easy access to all service points
- Each HSD incorporates two individual compressor units: Including a motor, SIGMA profile airend, Sigma Control 2 controller, separator, aftercooler, drain trap, and filtration
- Two complete compressor modules provides maximum part-load efficiency, built-in redundancy, and reduced installation costs.
- Single stage with cooling fluid injection for optimal rotor cooling
- Genuine KAESER rotary screw airend with energy-saving SIGMA profile
- 1:1 Direct drive
- Directly coupled without gears
- High-flex, maintenance-free coupling
- Dry air intake filter with pre-filtration
- Inlet silencer
- Pneumatic inlet and venting valves
- Cooling fluid separator tank with three-stage separator system
- Safety relief valve
- Minimum pressure check valve
- ETM electronic thermal management valve and eco fluid filter in coolant circuit
- Water-cooled fluid and compressed air aftercooler, water-cooled as standard
- Centrifugal separator with electronically-controlled condensate drain for energy savings without pressure loss
- Piping and centrifugal separator made from stainless steel
- All fully piped
- Flexible couplings
- Separate aluminum coolers for compressed air and fluid
- Optionally available with integrated fluid/water plate-type heat exchanger and additional fluid thermostatic valve
- External connections
- IE4 super premium efficiency motor
- IP 55
- Totally enclosed fan-cooled motor (TEFC)
- Class F insulation for greater power reserve
- Pt100 winding temperature transducer for motor monitoring
- External bearing lubrication
- Control cabinet to IP 54
- Control cabinet ventilation
- Automatic wye-delta starter
- Overload relays
- Control transformer
Why Choose a KAESER 650 HP Rotary Screw Compressor?
Service-Friendly Compressor Design
From the ground up, these 650 hp compressors have been designed with the user in mind. Fewer wearing parts and using premium quality materials ensure reduced maintenance requirements, longer service intervals, and extended service life. A smart component layout with generously sized maintenance doors simplifies service and reduces downtime.
Guaranteed Efficiency
In our systems design approach, KAESER chooses the components that work together in the most energy efficient way possible. Each and every component — from inlet filter to discharge flange — has been carefully designed with performance in mind. In fact, the 650 hp compressors in the HSD series is up to 18% more efficient than the competition. With KAESER’s superior system controls, we guarantee an effective system with lower operating costs.
Rugged Reliability
KAESER’s screw compressors meet our rigorous “built for a lifetime” standard. Designed and built with KAESER’s generations of manufacturing experience, you can rest assured that these compressors will continue to deliver the air you need with the exceptional reliability you expect from a KAESER compressor.
SIGMA Control 2: An Intelligent Compressor Control System
- Traffic-light LEDs for at-a-glance operational status
- Easy-to-read display with 30 selectable languages
- Soft-touch icon buttons
- Fully-automatic monitoring and control
- Dual, Quadro, Vario and Mono control modes available as standard
- Interfaces: Ethernet
- Additional optional communication modules for: Profibus DP, Modbus, Profinet and DeviceNet
- SD card slot for data logging and updates
- RFID reader
- Web server
Contact KAESER For Your Compressed Air Questions
Whether you have simple questions regarding your compressed air requirements or require custom solutions, our team is always available to answer your questions.
Request a Quote!
Our compressed air system experts can help you find the right compressed air solution for you.