BSD series screw compressors

BSD Series Rotary Screw Compressors (40 to 60 HP)

True 1:1 direct drive, flexible air- or water-cooled configurations, and maximum energy efficiency for heavy 24/7 manufacturing.

The Kaeser BSD Series delivers continuous-duty compressed air for mid-to-large industrial facilities requiring 157 to 289 acfm at working pressures from 125 to 217 psig. Built with gearless 1:1 direct coupling, premium efficiency IE4 drive motors, and Kaeser's power-saving SIGMA PROFILE® airends, the BSD Series minimizes power consumption while delivering long-term reliability under severe operating conditions.


Request a Quote | Find a Local Distributor | Download BSD Series Specifications (PDF)

 
 

Why Choose the Kaeser BSD Series?

Intelligent Automation & System Control

  • 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. 
  • SIGMA PROFILE® Airend: Precision-machined, single-stage flooded rotary screw airends match optimum rotor speeds to volumetric demand, cutting specific power consumption by up to 30% over conventional profiles. 
  • Premium Efficiency IE4 Drive Motors: Totally Enclosed Fan Cooled (TEFC) motors with Class F insulation come standard, operating at super-premium IE4 efficiency levels for lower lifetime electrical expense. 
  • Reduced Voltage Wye-Delta Starter: Softens in-rush electrical current spikes during startup for smooth acceleration and lower utility peak-demand charges.

Drive Reliability & Flexible Cooling Options

  • 1:1 Direct Drive Coupling: Connects the drive motor directly to the airend without gears or belts. This eliminates transmission slip, maintenance adjustments, and drive-related energy losses. 
  • Air-Cooled or Water-Cooled Execution:
    Air-Cooled: Features a dual-zone radial fan system drawing cool air across external coolers and motor chambers, maintaining low sound emissions (72–73 dB(A)) and enabling clean top exhaust ducting.
    Water-Cooled: Outfitted with stainless steel, plate-type heat exchangers as standard equipment (with shell and tube exchangers available upon request), ideal for plants with central cooling towers, closed loops, or high-ambient mechanical rooms. 
  • Two-Stage 1-Micron Air Intake Filtration: Traps fine airborne dust and particles before they reach fluid circuits or airend surfaces, protecting critical components and prolonging lubricant life.

Thermal Heat Recovery Ready

  • Up to 96% Energy Recovery: Compressing air converts roughly 100% of electrical input into heat. BSD units can be equipped with factory-installed internal plate-type heat exchangers to capture up to 76% of this heat directly from compressor fluid (producing hot process water up to 160°F), with up to 96% recoverable when combined with ducted exhaust air. 
  • Significant Cost Reductions: A 50 HP compressor operating full-time at $0.10/kWh uses more than $38,000 per year in electricity alone. Recovering waste thermal energy reduces fuel bills for boiler preheating, facility heating, or industrial wash stations. 

Available Configurations & Package Options

BSD 60T - 60 hp screw compressor with dryer
  • Standard BSD Models (BSD 40, BSD 50, BSD 60): Standalone direct-drive compressor units available in air-cooled or water-cooled variants for connection to existing plant air systems. 
  • Integrated Dryer "T" Models (BSD 40T, BSD 50T, BSD 60T): Features a built-in refrigerated air dryer housed in a dedicated, thermally isolated cabinet compartment. Equipped with energy-saving cycling control, a zero-loss ECO-DRAIN condensate drain, and low-GWP R-513A refrigerant.
  • Variable Speed (SFC) Drive Option: Available as an SFC configuration to match fluctuating plant air demand. Learn more on our Variable Speed Drive (SFC) Page.

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.]
BSD 40/40T 40 hp 80 – 175 psig 161 - 198 cfm 72 dB(A) 62 5/8" x 40 1/2" x 66 7/8" 2072 lb.
BSD 50/50T 50 hp 80 – 217 psig 157 - 239 cfm 72 dB(A) 2172 lb.
BSD 60/60T 60 hp 80 – 217 psig 187 - 295 cfm 73 dB(A) 2238 lb.
Note: Integrated dryer ("T") configurations alter overall cabinet dimensions and total package weight. Consult the full product brochure for detailed specifications on all configurations. Specifications subject to change without notice.

Typical Applications & Operating Environments for the BSD Series

  • Metal Fabrication & Multi-Press Production: Delivers high volume for plasma cutting assist gas, stamping presses, and robotic welding cells operating across two or three continuous shifts.
  • Industrial Finishing & Powder Coating Lines: Integrated refrigerated dryers ("T" models) remove moisture and aerosol contaminants before air reaches spray guns, preventing blistering, fisheyes, and surface defects on finished parts. 
  • Plastics, Blow Molding & Rubber Extrusion: Ideal for plants with cooling loops; optional water-cooled packages keep mechanical rooms cool while reliably powering mold actuation and feed systems.

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

What cooling options are available for the BSD Series?

The BSD Series is available in both air-cooled and water-cooled configurations. Water-cooled units include stainless steel plate-type heat exchangers as standard equipment, with shell and tube heat exchangers available on request.

What is the difference between the ASD 40 and the BSD 40?

While both deliver 40 HP, the BSD 40 provides slightly higher flow (196 cfm at 125 psig vs 192 cfm on the ASD 40), utilizes a larger heavy-duty frame and airend, and offers water-cooling capability, which is not available on ASD packages.

How does the integrated refrigerated dryer (T model) save energy?

The integrated dryer features cycling controls that run only when moisture removal is actively required, cutting electrical consumption compared to non-cycling dryers. It also includes a zero-loss ECO-DRAIN condensate drain to eliminate compressed air loss during moisture discharge.

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