PSA nitrogen gas generators and plants

Gastek PSA nitrogen generators deliver 95% to 99.999% nitrogen purity, selected around the application. Blanketing and food packaging typically run at 97.5–99.9%, while electronics and pharmaceutical processes use up to 99.999%. Where ppm-level residual oxygen is required, up to 99.9999%, a Deoxo purifier is added after the PSA plant.

PSA stands for pressure swing adsorption. Filtered, dried compressed air flows through a vessel packed with carbon molecular sieve, which traps oxygen, CO₂ and moisture in its micropores while nitrogen passes through. Twin adsorber vessels alternate automatically: while one produces nitrogen at pressure, the other regenerates by venting the adsorbed oxygen. The cycle repeats continuously, so supply never stops.

Standard PSA nitrogen plants cover 1 to 5,000 Nm³/hr, with higher capacities engineered on request. Each plant is sized from the actual duty (flow, purity, use-point pressure, duty cycle and operating hours) so the compressor, CMS volume and buffer match the real demand. Gastek has supplied plants of 2,500, 2,000 and 1,500 Nm³/hr to GSFC, the Vopec LNG Terminal and a strategic fuel store in Mangalore.

The price follows the duty: flow, purity, delivery pressure, and whether the air compressor and dryer are part of the supply. A plant for 99.999% costs more than one for 99% at the same flow, because it needs more CMS and a larger air package. Send the duty and Gastek quotes a configured plant, with the running cost and payback against cylinders or liquid nitrogen.

In most continuous-use cases, yes. Once operating hours are meaningful, generating nitrogen on site typically costs a fraction of delivered cylinder or liquid nitrogen. The main running cost is compressed air, so the economics depend on gas price, power cost and utilisation. On-site generation also removes ordering cycles, rental charges, delivery dependence and cylinder handling. Gastek reviews the payback as part of sizing.

Choose PSA when the process needs higher purity (up to 99.999%), larger continuous flows or the lowest energy cost per Nm³ at high purity. Choose membrane when 95–99.5% suits the duty and instant start-up, compact size and minimal maintenance matter most. Gastek manufactures both, so the recommendation follows the duty rather than a product line.

Compressed air and electrical power for the controls and analyser. Filtration and drying are engineered as part of the package, because feed air quality sets CMS bed life. An existing plant air compressor can often be used if its capacity and air quality suit; otherwise a dedicated compressor is specified with the plant.

Routine work is on the air side: filter elements, drains and the dryer, plus calibration of the oxygen analyser. The CMS beds themselves are long-lived when the feed air is clean, and Gastek supplies CarboTech CMS for refills on plants of any make.

A Gastek PSA nitrogen generator reaches on-spec purity in about 15 minutes from cold start. PLC control with a touch-screen HMI manages the cycle, and a continuous online oxygen analyser monitors purity, so the plant runs unattended as a utility.

Yes. Gastek exports from India to the Middle East, Southeast Asia and Africa, with support for buyers in the UAE, Saudi Arabia, Qatar, Oman, Kuwait, Bahrain, Malaysia, Thailand, Indonesia, Vietnam, Egypt, Kenya and more, plus Turkey, Bangladesh and Sri Lanka. Export references include a 610 Nm³/hr CE-certified package for a refinery in Malta and 1,100 Nm³/hr plants for polyester makers in Egypt, Turkey and Thailand.

Nitrogen flow, target purity or residual O₂, use-point pressure, application, operating hours and installation location, plus the destination country for export projects. With these, Gastek proposes the right PSA configuration instead of a generic quote, or recommends membrane if that fits the duty better.