Sizing a PSA Nitrogen Generator for Your Facility

4 min read
PSA Nitrogen Generator

When it comes to managing nitrogen needs within an industrial facility, a Pressure Swing Adsorption (PSA) nitrogen generator is an invaluable tool. PSA nitrogen generators offer a cost-effective and efficient solution for producing high-purity nitrogen gas on-site. However, selecting the right size and capacity for your PSA nitrogen generator is crucial to meet your facility’s specific requirements while optimizing resource utilization. In this blog, we will provide guidance on determining the appropriate size and capacity of a PSA nitrogen generator based on a facility’s nitrogen usage and requirements.

Understanding PSA Nitrogen Generators

Before diving into the sizing process, it’s essential to have a basic understanding of how PSA nitrogen generators work. These systems operate on the principle of adsorption, utilizing a pair of adsorbent beds to selectively separate nitrogen from the surrounding air. The air is compressed and passed through these beds, with one bed adsorbing oxygen and other impurities while the other bed produces high-purity nitrogen. The beds cycle in a controlled manner, ensuring a continuous supply of nitrogen.

Assessing Nitrogen Usage

To size a PSA nitrogen generator accurately, the first step is to assess your facility’s nitrogen usage. Different applications require varying levels of nitrogen purity and flow rates. Some common industrial applications for nitrogen include:

  1. Blanketing and Inerting

In applications like tank blanketing and inerting, a low to moderate purity nitrogen stream is often sufficient. The primary objective here is to displace oxygen to prevent combustion or degradation of stored materials. Flow rates are usually moderate.

  1. Food Packaging

In the food packaging industry, nitrogen is used to extend the shelf life of products by displacing oxygen. High-purity nitrogen is typically required at low to moderate flow rates, depending on the packaging equipment’s capacity.

  1. Electronics Manufacturing

For applications in electronics manufacturing, such as wave soldering or pick-and-place machines, high-purity nitrogen with precise flow control is essential. These applications often have high flow rate requirements.

  1. Laser Cutting and Welding

Industrial processes like laser cutting and welding demand a high-purity nitrogen supply at variable flow rates, depending on the size and power of the equipment.

Determining Flow Rate and Purity

Once you’ve identified the primary application of the PSA nitrogen generator in your facility, you’ll need to determine the required flow rate and purity level. Flow rates are usually measured in cubic feet per minute (CFM) or liters per minute (LPM), while purity levels are expressed as a percentage (e.g., 99.5%, 99.99%).

To calculate the necessary flow rate, consider factors such as the number of nitrogen-dependent processes running simultaneously, peak demand, and any future expansion plans. Additionally, the required purity level depends on the sensitivity of the specific application and the quality standards it must meet.

Selecting the Right Size

Once you’ve gathered all the necessary information regarding flow rate and purity requirements, you can begin to select the appropriate size of the PSA nitrogen generator. Manufacturers provide sizing guidelines and specifications for their equipment, considering various factors such as pressure, temperature, and cycle times. It’s essential to consult with your PSA nitrogen generator supplier or a qualified engineer during this phase to ensure you choose the right model for your facility.

Factors to Consider

While assessing your PSA nitrogen generator‘s size, take into account these important factors:

Duty Cycle: PSA nitrogen generators operate in cycles. The duty cycle, which includes the adsorption and desorption phases, can affect the nitrogen output. Ensure that the generator’s cycle time aligns with your facility’s requirements.

Compressor Capacity: The compressor size should match the nitrogen generator’s flow rate specifications. An appropriately sized compressor is crucial to maintaining consistent nitrogen production.

Operating Conditions: Consider the environmental conditions in your facility, such as temperature and humidity, as they can impact the PSA process’s efficiency.


It’s wise to plan for potential growth and increased nitrogen demand when sizing your PSA nitrogen generator. Selecting a slightly larger generator than your immediate needs require can prevent costly upgrades or replacements in the future.


Sizing a PSA nitrogen generator for your facility is a critical decision that directly impacts the efficiency and cost-effectiveness of your nitrogen supply. By thoroughly assessing your facility’s nitrogen usage, determining the required flow rate and purity, and considering all relevant factors, you can make an informed choice and ensure that your PSA nitrogen generator meets your present needs while allowing for future expansion. Consulting with experienced professionals and your generator supplier is essential to achieving the best results.

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