Oil-free screw compressors

Z 55-900 (VSD): Oil-free air- and water-cooled rotary screw compressors, 55-935 kW / 75-1253 hp

Atlas Copco’s Z 55-900 VSD Pack and Full Feature ranges power your production with ultimate reliability and efficiency under the harshest conditions. The first air compressors in the world to be certified Class 0 according to ISO 8573-1 edition 3, 2010, they ensure completely oil-free air to protect your process and end products. Several energy saving features – Variable Speed Drive, energy-free MD dryers and energy recovery – are offered. Z 55-900 VSD compressors are all-inclusive, plug-and-play packages that ensure easy and low cost installation and a quick start-up.


Customer benefits

  • Highest reliability – For over 50 years, Z compressors stand for durability and reliability. They incorporate Atlas Copco’s proven screw technology, stainless steel coolers, AGMA A4/DIN 5 gears and state-of-the art electrical drive systems, all of which contribute to overall high reliability. Z compressors are built using long-standing internal engineering practices, and are manufactured and tested according ISO 9001.
  • Certified 100% oil-free – Z 55-900 compressors provide you with 100% pure, clean air that complies with ISO 8573-1 CLASS 0 (2010) certification. CLASS 0 means zero risk of contamination; zero risk of damaged or unsafe products; zero risk of losses from operational downtime; and zero risk of damaging your company’s hard-won professional reputation. In 2006 Atlas Copco was the first manufacturer in the world to receive such certification on an oil-free compressor.
  • Maximum energy savings – Atlas Copco’s unique and time proven rotor coating ensures high efficiency over the compressors lifetime. The state-of-the art air compressor element is powered by a high-efficiency electric motor, contributing to maximum compressor package efficiency. Further optimize your energy savings with our innovative and unique Variable Speed Drive, our energy recovery feature and energy-free MD dryers.
  • Easy installation – The integrated design of the Z compressor includes internal piping, coolers, motor, lubrication and control system: all supplied as a ready-to-use package. Installation is fault-free, commissioning time is low and no external instrument air is required.
  • Advanced control and monitoring – To maximize efficiency and reliability, the Elektronikon® controls the main drive motor and regulates system pressure within a predefined and narrow pressure band. The Elektronikon® controller can be adapted to your specific needs with extra sensors, digital contacts, fieldbus, Internet and SMS communication functions. In combination with the ES multiple compressor controller, the operation of your complete compressor room is optimized.

Technical data

  • Units: Imperial
Technical Specifications
Capacity FAD (l/s) 121 - 2456 l/s
Capacity FAD (m³/h, cfm) 256 - 5204 cfm
Working pressure 101.5 - 150 psig
Working pressure variant 13 bar 147 - 369 HP
Installed motor power 75 - 1253 HP
  • Units: Metric
Technical Specifications
Capacity FAD (l/s) 121 - 2456 l/s
Capacity FAD (m³/h, cfm) 436 - 8842 m³/h
Working pressure 7.5 - 10.4 bar(e)
Working pressure variant 13 bar 110 - 275 kW
Installed motor power 55 - 935 kW

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