HSD series screw compressors

HSD Series Dual Rotary Screw Compressors (500 to 700 HP)

Two independent compressor systems in an 82.5 sq ft footprint, delivering built-in 50% redundancy, water-cooled efficiency, and multi-megawatt industrial reliability.

The Kaeser HSD Series provides continuous-duty compressed air for heavy industrial manufacturing facilities requiring 1,653 to 3,044 cfm at working pressures from 80 to 217 psig. Engineered with two independent drive motors, two SIGMA PROFILE® airends, and dedicated fluid circuits inside a single enclosure, the HSD Series delivers full-load utility capacity while guaranteeing that 50% of plant airflow remains online during routine servicing.


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Why Choose the Kaeser HSD Series?

HSD open compressor

2-in-1 Dependability & Operational Redundancy

  • Two Complete Compressor Systems in One Package: Each HSD houses two complete SIGMA PROFILE® rotary screw airends, two drive motors, and independent fluid separation circuits. If one unit requires routine maintenance or filter replacement, the second unit maintains 50% of the total plant airflow to prevent production halts. 
  • Smart Motor Starters: When full capacity is required, the two motors start one after the other with an automated time delay. This sequential starting prevents electrical current surges and protects the facility's electrical grid from peak-demand ratchet charges. 
  • Demand-Based Staging: The dual design automatically stages between base-load and peak-load requirements, matching actual plant air consumption without part-load power waste. 
  • Compact Footprint (~82.5 sq ft): By integrating two large-scale machines into a single water-cooled cabinet (140 1/2x 84 1/2 x 92 1/2 in.), the HSD minimizes physical floor space requirements and simplifies mechanical room planning.

Standard Water-Cooling & Low Sound Output

  • Stainless Steel Plate Heat Exchangers (Standard): Copper-brazed stainless steel plate-type exchangers provide high thermal transfer, corrosion resistance, and low approach temperatures for facilities with clean cooling water circuits. 
  • Shell and Tube Heat Exchangers (Optional): Mechanically cleanable copper-nickel (CuNi10Fe) shell-and-tube heat exchangers resist contamination and seawater corrosion, making them suitable for open cooling towers, river water, or marine environments. 
  • Low Noise Emissions: Acoustic enclosure paneling and water-cooled thermal rejection keep sound levels between 73 and 75 dB(A) across the entire 500 to 700 HP range.

Energy Savings, Automation & Heat Recovery

  • SIGMA CONTROL Automation: The SIGMA CONTROL continuously tracks operating metrics, predicts maintenance needs, and integrates with factory management systems or the SIGMA AIR MANAGER 4.0 master controller.
    Standard Anybus Interface: It connects to your PLC or SCADA network via interchangeable communication modules.
    Supported Protocols: Modbus TCP, PROFIBUS DP, PROFINET IO, EtherNet/IP, BACnet/IP, and OPC UA. 
  • Recover Up to 72% of Power via Fluid Heat Recovery: Compressing air converts approximately 100% of electrical drive input into heat. The HSD's integrated plate heat exchanger system extracts up to 72% of overall power consumption directly from the cooling fluid to deliver hot water up to 160°F without requiring external floor space. (Special fail-safe heat exchangers are available for sanitary or food-grade water heating.)

Technical Specifications

Model Rated Motor Power [hp] Operating Pressure Range [psig] Capacity Range [cfm] Sound Level [dB(A)] Dimensions W x D x H [in.] Base Unit Weight [lb.]
HSD 500 500 hp 80 - 175 psig 1885 - 2355 cfm 73 dB(A) 140 1/2" x 84 1/2" x 92 7/8" 16,493 lb.
HSD 550 550 hp 80 - 217 psig 1653 - 2563 cfm 74 dB(A) 18,082 lb.
HSD 600 650 hp 80 - 217 psig 1830 - 2804 cfm 74 dB(A) 18,594 lb.
HSD 650 700 hp 80 - 217 psig 2007 - 3044 cfm 75 dB(A) 19,105 lb.
Note: Consult the full product brochure for detailed specifications on all configurations. Specifications subject to change without notice.

Typical Applications & Heat Recovery Use Cases

  • Automotive Stamping & Primary Assembly: Powers continuous plant-wide pneumatic distribution networks, robotic tooling, and stamping presses requiring 2,000+ cfm around the clock. 
  • Chemical, Petrochemical & Refining: Provides process and control air where plant downtime halts batch processing; fail-safe heat exchangers supply sanitary hot process water. 
  • Thermal Heat Recovery Applications:
    * Pre-heating boiler feed steam
    * Heating water for industrial laundries and wash-down stations
    * Food and beverage wash-down and pasteurization processes
    * Heating fluid for plastic molding and metal plating baths 
  • Central Baseload Utility Station: Functions as the multi-megawatt core in large facilities, integrating with a SIGMA AIR MANAGER 4.0 to balance operating hours between both internal units.

Browse rotary screw compressors by rated horsepower (HP)

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Our 3-30 hp compressors use a space-savings v-belt drive design and many are available as complete compressed air systems with receiver tanks and integrated dryers. On larger units we use only true direct drive, providing maximum power transfer and efficiency from motor to airend. Options include integrated refrigerated dryers and variable speed drive.

Frequently Asked Questions

Is the Kaeser HSD series available as an air-cooled compressor?

No. The HSD series is engineered exclusively as a water-cooled package. At 500 to 700 HP, water cooling keeps sound levels low (73–75 dB(A)), eliminates hot room air exhaust, and allows a compact footprint of approximately 82.5 sq ft.

What is the advantage of the HSD dual-system design?

The HSD contains two complete, independent compressor units inside a single enclosure. If one system is stopped for scheduled service, the other system continues operating at 50% flow capacity. Additionally, its smart starters engage the two drive motors sequentially with a slight time delay, preventing severe power spikes on the plant electrical service.

What is the difference between the standard plate-type and optional shell-and-tube heat exchangers?

Standard stainless steel plate-type exchangers provide high thermal efficiency for clean, closed-loop cooling systems. The optional copper-nickel (CuNi10Fe) shell-and-tube exchangers are mechanically cleanable and resistant to seawater, making them suitable for open cooling towers, river water, or marine environments with higher particulate loads.

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