What compressed air conditions are needed for on-site nitrogen generation?

When generating nitrogen on-site, the quality of your compressed air plays a critical role in ensuring consistent gas purity and system efficiency. Whether you're working with membrane or PSA nitrogen generators, the performance of your nitrogen system depends on the cleanliness, dryness, and stability of the air entering the generator.

This article outlines the three key compressed air requirements you need to meet to guarantee reliable, high-purity nitrogen production.

1. Clean air, free from oil and particles

Contaminants in compressed air—especially oil, dust, and particles—can compromise the nitrogen generator and reduce gas purity. For this reason, effective filtration is essential.

If your system uses an oil-lubricated compressor, you’ll need coalescing filters to remove oil aerosols. Pre-filters and fine particulate filters are also recommended to trap solid particles and further protect the nitrogen generator’s membranes or adsorbent materials.

2. Dry air, moisture-free for stable performance

Compressed air always contains water vapour, which must be removed before it enters the nitrogen generator. Moisture can damage internal components, disrupt adsorption or membrane processes, and reduce nitrogen purity.

Depending on your application and site conditions, you can choose from several dryer technologies:

Refrigeration dryers – Ideal for general use. Pneumatech’s AC models achieve a dew point around +3°C.
Adsorption dryers – Suitable for demanding applications. PH and PB models reach ultra-low dew points between -20°C and -70°C.
Membrane dryers – Compact and low-maintenance. Pneumatech PMD units offer a space-saving, no-regeneration solution.

Each of these options helps ensure the air feeding your nitrogen generator is as dry as required for consistent, efficient operation.

3. Stable pressure and temperature

To operate effectively, most nitrogen generators require compressed air to fall within specific pressure and temperature ranges. As a general rule:

Pressure: 4 to 13 bar
Temperature: 10 to 25°C

A high-quality dryer system helps stabilise both factors, reducing strain on the nitrogen generator and ensuring a consistent output.

Looking to improve your nitrogen supply?

If you’re considering on-site nitrogen generation, getting your compressed air system right is the first step. Pneumatech offers a full range of dryers, filters, and nitrogen generators to match your needs—plus expert advice to guide your installation. Contact us today to get personalised recommendations and ensure your system is set up for success.

Contact our nitrogen experts

Corporate