LGN – Nitrogen Gas Generators



The LGN series plants prLGN 2000 - 3 small pix - lgn_with_clouds - smalloduce high purity gaseous nitrogen (600 ‚Äď 1000 Nm¬≥/hr) by cryogenic distillation of atmospheric air. The generator is a liquid assist type and features a compact and modular design.


The plant utilizes an air compressor to provide feed air that operates above the gas Nitrogen delivery pressure.  A small amount of liquid Nitrogen is necessary to be added to the top tray of the distillation column to provide  additional refrigeration required for the plant to make up for the cold box heat loss.



LGN – Nitrogen Gas Generators


The plant layout is configured to provide maximum efficiency and ease of maintenance. The plant consists of three modules, an Air Compressor Module (ACM) that provides process air, a Warm Equipment Module (WEM) that purifies compressed air and a Cold Box Module (CBM) that houses the distillation equipment.


Standard Equipment & Features

The LGN series process control is automatic. It is designed for unattended operation. Once the plant is started and running, the air separation process, purity control and all the subsystems external to cold box are fully automatic.



Cosmodyne is a world leader in the design and manufacture of air separation plants since 1958. 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.


LGN – Nitrogen Gas Generators


Below are typical capacities. Other capacities are available.

Gaseous Nitrogen Production Nm³/hr 666 837 993
Gaseous Nitrogen Purity ppm O2 5 5 5
Product Pressure bar(g) 7.3 7.3 7.3
Liquid Nitrogen Required

(% of production)

% 5.66% 5.22% 5.20%
Power kW 213 268 318
Specific Power  kWh/Nm³ 0.32 0.32 0.32