Rotary Screw Compressors

Dresser-Rand continues a strong tradition of performance in positive displacement compression.

Operating over a wide range of pressures and speeds and handling a multitude of gases from air to light hydrocarbons, ammonia, freon, hydrogen and nitrogen. Dresser-Rand AXI compressors offer proven performance in rugged applications in chemical, petrochemical, oil and gas production, refining, and heavy industry.

AXI Compressors

Dresser-Rand AXI compressors boldly continue proving themselves day in and day out by handling the really difficult uses in the chemical, petrochemical, oil and gas production, refining, and heavy industry markets.

Our AXI units are adaptable to all types of drivers and coupling arrangements for electric motors, steam turbines, gas turbines, or diesel or gas engines. Control panels can be equipped with any degree of electronic instrumentation. In addition, sound-attenuating silencers and enclosures or blanketing are offered to help meet federal and customer noise reduction requirements.

The Type H AXI packages, we pre-assemble the appropriate drive, oil system, sealing system, auxiliaries, piping, and controls onto one or more bases to save valuable field installation time.

The Type L AXI packaged units are piped, wired and fitted out prior to shipment for remote, difficult applications where unattended operation is required (i.e., in desert or ocean platform sites).

AXI Compressor Features and Benefits

  • Unique housing construction
    • Removable end-covers permit easy access to timing gears, seals and bearings
  • Quiet helical timing gears
    • Synchronized rotors with close clearances enhance long life
    • Timing gears transmit only a tenth of the driver power, resulting in negligible wear
  • Lubricant-free compression
    • No oil contamination of air or gas being compressed
  • Positive displacement compressor
    • Operates over a wide range of pressures and speeds
    • Handles a multitude of gases from air to light hydrocarbons, ammonia, freon, hydrogen, and nitrogen
    • Permits operation at moderate speeds, suitable for direct-connected motor drive
  • Less area required for capacity range
    • May cut floor space costs substantially
  • No unbalanced forces
    • Eliminates need for expensive foundation, lowering installation costs
  • Rotors do not touch each other or the casing
    • Actual compressing parts not subject to mechanical wear. Power requirements are less than other types of oil-free compressors in its pressure range

AXI Selection Charts

Type L – Low Pressure AXI Compressors

Frame Range of Nominal Capacities
cfm (m3 / min)
Port Dia. – Inlet
in (mm)
Port Dia. – Discharge
in (mm)
Approx. Bare Unit Weight
lb (kg)
450L 200 – 402 (5.78 – 11.4) 4 – 6 (102 – 152) 3 – 4 (76 – 102) 400 – 510 (181 – 231)
562L 496 – 1,036 (14.0 – 29.3) 8 (203) 6 (152) 450 – 565 (204 – 256)
675L 1,298 – 1,603 (36.8 – 45.4) 10 (254) 8 (203) 960 – 1,015 (425 – 460)
787L 2,015 – 1899 (57.0 – 82.1) 12 (305) 10 (254) 1,220 – 1,370 (554 – 662)
105X 3,321 (94.0) 12 (305) 12 (305) 2,850 (1293)
121X 3,647 – 5,514 (103.3 – 156.1) 14 (356) 14 (356) 3,090 – 3,550 (1,402 – 1,610)
138X 6,308 – 8,786 (178.6 – 248.8) 16 (406) 16 (406) 4,050 – 4590 (1,838 – 2,083)
155L 9,746 – 12,380 (276.0 – 350.6) 20 (508) 20 (508) 7,400 – 8,800 (3,357 -3,993)

Type H – High Pressure AXI Compressors

Frame Range of Nominal Capacities
cfm (m3 / min)
Port Dia. – Inlet
in (mm)
Port Dia. – Discharge
in (mm)
Approx. Bare Unit Weight
lb (kg)
200H110 1,450 (41.0) 8 (203) 5 (127) 1,575 (715)
200H165 2,190 (62.0) 10 (254) 6 (152) 1,750 (795)
250H110 2,530 (71.6) 10 (254) 6 (152) 2,430 (1,100)
250H165 3,800 (107.6) 12 (305) 8 (203) 2,700 (1,225)
315H110 4,000 (113.3) 12 (305) 8 (203) 4,280 (1,950)
315H165 5,850 (165.6) 14 (356) 10 (254) 4,750 (2,160)
400H110 6,650 (188.3) 14 (356) 10 (254) 8,200 (3,730)
400H165 10,000 (283.2) 20 (508) 12 (305) 8,900 (4,050)
500H110 11,000 (311.5) 20 (508) 12 (305) 13,400 (6,100)
500H165 16,000 (453.0) 24 (610) 16 (406) 14,700 (6700)
600H100-
600H165
to 30,000 30 (762) 20 (508) 28,000 (12,762)

New Units / Overhauls  / Parts

  • New units are available for immediate delivery from our facility and are mechanically and performance tested before shipment.
  • Overhaul kits are available and include bearings, seals, gaskets, O-rings, and hardware.
  • All parts for the Spiraxial 5 ¼ x 6 ¾ LAL-SP-SVP atomizing air compressor are available at our Houston service center.