ASPEN Series – Air Separation Plants


Overview tab main pix & 3 sml pix- Spruce rendering (2)

The ASPEN plant is a medium sized air separation plant designed to produce liquid nitrogen, oxygen and, as an option, liquid argon by cryogenic distillation of atmospheric air.  In addition, when operating in maximum oxygen mode, gaseous nitrogen is also available, if required, when there is a pipeline or other on-site  nitrogen requirement or to liquefy for additional liquid nitrogen capacity.  Capacities range from 15 to 35 metric tons per day.  The ASPEN plant is designed to minimize shipping and allow for rapid installation by providing the plant in four distinct modules: the main air compressor, the air treatment module, the recycle compressor, and the cold box.  The plant system is self-contained and can be completely installed outdoors.  The plants require a source of cooling water, power supply and a simple foundation.


The ASPEN plants are designed to meet the most severe operating conditions.  Over 35 ASPEN plants have been deployed producing liquid oxygen, nitrogen and argon for medical, industrial, oil field and military applications in some of the most remote regions of the world.



ASPEN Series


The ASPEN air separation plant is a highly modular system that can produced liquid oxygen, liquid nitrogen and, as an option, liquid argon by cryogenic distillation of atmospheric air.  In addition, gaseous nitrogen is also available if required for liquefying, pipeline supply or other on-site applications.


Built to the highest standards of reliability and efficiency, the ASPEN plants utilize a modular design concept for rapid on-site installation, ease of shipping, handling and relocation.  The plant systems are self-contained and can be completely installed outdoors, requiring only cooling water, power supply and a simple foundation.


The ASPEN plant is comprised of the following modules.  The air treatment module (ATM) is the backbone of the system.  In addition to the air clean up and refrigeration unit, the ATM contains the master piping and electrical distribution manifolds.  All piping and electrical connections between the modules are made through the ATM, minimizing field piping and wiring.  Plant installation is reduced to merely connecting the cold box module (CBM), argon purification module (APM) and cooling water to the ATM and connecting plant power.


Each module is tested for pressure, strength, tightness, and control functionality which allows for minimum commissioning time.  Under normal condition the plants can be installed and commissioned within 30 days after arrival on site.


The ASPEN plant is configured with a single feed and single recycle compressor or optional dual recycle compressors (ASPEN 1000 only).  With the dual recycle option, all three compressors are identical and interchangeable to minimize spare parts inventory, maximize overall reliability and minimize start-up electrical load.  In the event of feed air compressor failure, either of the recycle compressors can be crossed over to feed air function, providing reduced capacity production while repairs are being made.


Finally, the ASPEN plant can be run in liquid-assist mode to provide the owner some flexibility during times of low nitrogen demand or high power prices.


A lot of emphasis was placed on simplicity, reliability and modularity in the design of the ASPEN plants without sacrificing on plant performance. The ASPEN plant  proudly boasts a low specific power.


Standard Equipment & Features


  • Cosmodyne PLC based controls provides a user-friendly graphic interface for remote, local or unattended operation
  • Automatic control of all primary plant functions
  • State-of-the-art analytical instrumentation package
  • Dual, high performance turboexpanders with removable cartridge style rotating elements
  • Proven molecular sieve type air clean-up system


Options and Accessories

  • Crude Argon Production
  • Refined Liquid Argon Production
  • Nitrogen Liquefier
  • Closed Loop Evaporative Cooling System
  • 50 or 60 Hertz Electrical System
  • Product Storage Tanks
  • Cylinder Charging Systems
  • Liquid Transfer Pump Systems
  • Other customized features for site specific requirements



  • On-site or in-factory operator training
  • Installation and commissioning assistance
  • Extended warranty package
  • Service package
  • Aftermarket spare parts support
  • Aftermarket technical support



Cosmodyne is a world leader in the design and manufacture of air separation plants. Each Cosmodyne system is designed and built to rigorous standards of quality and workmanship from nearly a half-century of experience. From proposal to installation, our sales, engineering, manufacturing and field-service personnel continually demonstrate our commitment to customer satisfaction. ¬†And this commitment doesn‚Äôt end with delivery — our field-service staff is ready to serve you 24 hours a day, wherever you are.¬† When you buy a Cosmodyne plant you can be sure you will receive a quality built and reliable plant.


All plants, regardless of destination, are built to the following codes:

– Pressure vessels: Per ASME Section VII, Div. 1 and includes code stamp and name plate

– Piping systems: Per ASME B31.3

– Electricals: NEC, NEMA and UL standards


Additional code compliance available including: CE/PED, CRN/CSA, GOST, MIL-SPEC, API and various marine certifications.

Prior to shipping, each module is tested for pressure, strength, tightness, and control functionality.

ASPEN Series

A 1000

Max Mode

A 400

Max Mode

Oxygen Nitrogen Oxygen Nitrogen


Liquid Oxygen Nm3/hr 839 60 391 0
Liquid Nitrogen Nm3/hr 182 1030 62 465
Liquid Argon² Nm3/hr 27 0 0 0
Total Liquid Production Nm3/hr 1048 1090 453 465
Gaseous Nitrogen Nm3/hr 213 268 392 585


Liquid Oxygen % O2 min  99.6% 99.6% 99.6% 99.6%
Liquid Nitrogen ppm O2 max 2.0 2.0 2.0 2.0
Pure Liquid Argon² %Ar min  99.999% 99.999%
Crude Liquid Argon² %O2 max  2.0% 2.0%
Gaseous Nitrogen ppm O2 max 5.0 5.0

 Plant Utilities Required

 Power   kW  1262 1249  675  675
 Cooling Water
      Flow Rate  lpm 2650 2650 1340 1340
¬† ¬† ¬† Temperature ¬†¬įC ¬†20 ¬†20 20 20
 Specific Power³  kW-hr/Nm3  1.20  1.15  1.49  1.45
  1. Plant performance is based on¬† standard conditions ¬†20¬įC, 50%RH, 1.0 atm
  2. Optional
  3. Based on liquid products only