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Whether you're upgrading your lab or setting one up for the first time, nitrogen access is key. Industries all over the world use nitrogen generator systems to supply your instruments with the nitrogen you need.
Unlike gas cylinders, a nitrogen gas generator will never run out of gas and supplies your lab with consistently high purity.
Investing in one, such as a Gast nitrogen generator, brings you a number of benefits, and there are a couple of different types of generators to consider.
A lab nitrogen generator is a sound investment because you'll save money in the long run. Gas prices naturally fluctuate throughout the year, which can make it difficult to budget.
On-site generators, however, cut out the need to order nitrogen tanks.
You won't have to find a provider and then pay them for the tanks, nor will you have to wait for them to actually ship to your location. This will also eliminate delivery truck use if your lab is conscious of your carbon footprint.
Additionally, you won't have to pay rental fees for the tanks, which you will have to return at some point.
Typically three cylinders will be on-site at any one time ' a used one waiting to get picked up, one you're currently using, and a full one not connected yet.
One such brand to look into is Gast, which has a wide array of pneumatic products including vacuum pumps, compressors, and regenerative blowers. You can trust their products to operate in multiple critical applications in a lab or otherwise.
Gast products are also designed to be easily serviced and are equipped with dual-voltage motors, making them the most versatile products in the pneumatic industry.
Extra equipment in your lab creates a safety hazard. After all, it's dangerous to lug giant cylinders past your expensive equipment.
Nitrogen cylinders have to be secured on specific racks, which take up a lot of space. They also need to be placed in an area where, should they leak, your employees won't suffocate.
Nitrogen generators are a safer alternative that doesn't risk personal injury or destruction of lab property.
Nitrogen generators use compressed air to produce nitrogen gas by removing it from the normal air humans breathe every day. In fact, 78 percent of the air is nitrogen, while only 21 percent is oxygen.
There are systems and safety valves built into the device that vent excess oxygen into the environment while maintaining the nitrogen in the lab's air. You should also install ambient room analyzers that will read the air's oxygen levels.
Membrane type nitrogen generators use special membrane materials to allow the passage of one gas while minimizing another. It's essentially a filter, much like the one you use when making coffee in the morning.
The gas pushed through the membrane is over 90 percent nitrogen, with most of the other air molecules getting pushed out.
More advanced systems can have multiple stages of filtration before even reaching the membrane. This helps to remove other particles like dust and excess moisture, protecting the membrane from getting clogged or damaged.
Fine mesh filters are commonly used in the process to remove particles in the air, while air dryers remove moisture.
PSA type nitrogen generators work with high pressure similar to the membrane types but without a membrane built-in.
Under high pressures, nitrogen gas exhibits a strong affinity for certain adsorbent media. These materials include Zeolite and Granular activated carbon (GAC).
Various other gases can also be absorbed from a mixture at different rates depending on pressure.
A PSA generator is typically made up of two towers. One is for absorption, while the other is for regeneration.
A compressor pushes air into the absorption tower and makes contact with the adsorbent which holds onto nitrogen gas. Oxygen and other impurities pass through.
When the stored nitrogen needs to be collected, you reduce the pressure.
There are other PSA nitrogen generators that work the opposite way. Instead of holding onto the nitrogen and pushing everything else through, they hold onto the impurities and allow the smaller nitrogen particles through.
This is primarily done by passing air through a column of packed material made of carbon called a Carbon Molecular Sieve (CMS).
A PSA nitrogen generator requires two CMS columns to function. As one column is depressurized, the other pushes air through the sieve at pressure.
Both types of PSA generators are similar to the membrane generator in that they also contain prefiltration stages to remove excess dust and moisture to protect the CMS.
Nitrogen generator systems have many applications in more industries than you'd expect.
Food and beverage industries flood their products with nitrogen that displaces oxygen and prolongs product lifetimes. It also stops the chemical degradation of food that is caused by oxidation.
In analytical chemistry, a stable and continuous supply of nitrogen is essential.
Aircraft and motor vehicle tires also require nitrogen because most aircraft and vehicle tires are filled with pure nitrogen. This is because nitrogen maintains a more stable pressure and its tanks lack water vapor.
Contact us to discuss your requirements of Ultra High Purity Nitrogen Generator. Our experienced sales team can help you identify the options that best suit your needs.
Regardless of your industry, nitrogen generator installation can be an easy process if you follow the manual that comes with your device. Usually, you can pair a stand-alone generator with your existing compressor, a house air system, or an oil-lubricated air compressor.
When dealing with applications such as liquid cooling or sterile connections, consider a product line that is focused on those needs. Precise and easy connections are essential in the biopharmaceutical field.
Although there are only two main types of nitrogen generator, there are a number of other things to consider before investing in one.
What kind of space are you working with, and what level of nitrogen usage and purity do you need? How much are you willing to spend to make the upgrade?
There is also the matter of connecting pieces to consider.
Check out our online shop today for your choice of pneumatic, hydraulic, electromechanical, filtration, hoses, and more for your lab's needs. And reach out to us if you have any questions or concerns.
Due to its inert nature, gaseous nitrogen can be used in various purging, blanketing, and flushing operations. Depending on the process involved, different grades of nitrogen purity are needed to fulfill unique manufacturing needs.
This article discusses the categories of nitrogen gas for industrial use and their appropriateness for different manufacturing processes.
Nitrogen purity refers to the proportion of nitrogen gas present in a sample taken from its stream compared to impurities present. Nitrogen gas can be categorized as high purity or low purity depending on the ratio of pure gas to contaminants like oxygen, water vapor, carbon monoxide, and carbon dioxide.
This categorization based on nitrogen concentration plays a key role in determining the suitability of nitrogen for any industrial process.
The purity of a sample of nitrogen gas is determined by the percentage/concentration of pure nitrogen in it. For gas to be classified as high purity, it must possess at least 99.998 percent nitrogen while lower purity nitrogen gas usually contains a higher proportion of impurities.
High-Purity Nitrogen Gas
Gaseous nitrogen with concentrations above 99.998% is considered a high-purity fraction. High nitrogen purity can be graded in different ways by different manufacturers; however, it is mostly considered to be a 'zero-grade' fraction. Zero-grade nitrogen purity is categorized as such because it contains less than 0.5 parts per million of hydrocarbon impurities.
Other key characteristics of high-purity nitrogen gas are:
Low-Purity Nitrogen Gas
Nitrogen gas ranging between 90 to just under 99.9% is considered to be low-purity. Common low-purity nitrogen gas brands include:
Nitrogen gas manufacturers name their products differently; there are no standardized naming conventions. As a result, a low-purity gas from one producer might be mistaken for a high-purity gas by another based on its name alone. The only definitive way to determine a gas rating is to check the manufacturer's guide on their unique gas concentrations.
Classifying pure nitrogen gas is done with the grading system using digits within each minimum purity rating. The first digit of each grade refers to the number of 'nines' present in it while the second digit represents the number following the last nine. For example, grade N3.0 is equal to 99.9% nitrogen purity and is a pure grade gas purity classification (no second digit attachment).
Pure grade nitrogen classifications include N2.0, N3.0, N4.0, N5.0, N6.0, and N7.0.
Ultra-high nitrogen purity levels refer to a nitrogen gas concentration of 99.999% with negligible impurities. UHP nitrogen specifications are strict with variations rendering the classification invalid.
The oxygen content of UHP gas can be no greater than 2 parts per million by volume (ppmv), total hydrocarbons cannot exceed 0.5 parts per million by volume, and moisture no greater than 1 part per million by volume). UHP nitrogen gas is typically used in scientific applications.
Oxygen-free nitrogen is defined as gaseous nitrogen containing no more than 0.5 parts per million of oxygen. OFN gas is typically maintained at 99.998% nitrogen purity. This grade of nitrogen gas is useful in scientific research and calibration processes where oxygen impurities might alter outcomes or cause incorrect results.
As mentioned above, the concentration of nitrogen required in different industrial processes varies greatly. The key consideration in choosing a grade of nitrogen is the effect of impurities on the selected application. Sensitivity to moisture, oxygen, and other contaminants are critical factors to consider
Pharmaceutical manufacturing processes require high nitrogen purity levels to prevent contamination and alteration of their final products. Many drugs require high-grade nitrogen with a purity between 97-99.99%. This high to ultra-high purity nitrogen is used for nitrogen blanketing storage tanks, receptacles, and other equipment used in drug manufacturing.
High-purity nitrogen is also used in drug packaging to help retain freshness and keep active ingredients from deteriorating.
Gaseous nitrogen with purity levels ranging from 95-99% is useful in the oil and gas industry to reduce the risk of fires and explosions in associated processes. Chemical storage tank inerting and pipeline purging with gaseous nitrogen help minimize the risk of sudden combustion of their contents.
Pipeline maintenance services frequently use pressurized nitrogen for pipeline cleaning and pipeline decommissioning processes.
Nitrogen is commonly used in different steps of food/beverage production, packaging, and storage. Nitrogen in food packaging and processing is used to preserve the shelf life of processed food/drinks by eliminating food oxidants, preserving flavor, and preventing rancidity. Food-grade nitrogen gas requirements typically fall between 98-99.5% purity.
Understanding the nitrogen grade requirements for each application is essential for selecting the appropriate nitrogen supply source and ensuring optimal performance and reliability. Some industrial applications and their nitrogen-grade requirements are outlined below.
At NiGen, we specialize in supplying and maintaining efficient onsite nitrogen generators tailored to meet the diverse needs of various industrial manufacturing processes. With our extensive range of products and services, we ensure that all nitrogen requirements are fulfilled at every stage of your production cycle.
Contact us online today for a quote or to learn more about our services and nitrogen generators.
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