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Home> FAQ

• 1. Oxygen vs Nitrogen Comparison

  Nitrogen	Compressed Air
  Dry and Clean	Oily and wet
  Remains stable at any temperature	Highly reactive element at high temperatures/ pressures
  Eliminates condensation which prevents rim rust	Creates moisture in the rim leading to rim rust
  Slows migration to only 2psi loss over 6 months	Fast migration, 2psi is lost each month

• 2. Which nitrogen generation technology should I select?

  It really depends on your application and preference. Just from a capital cost standpoint, membranes are approximately 300% more expensive than PSA systems. They require more power than PSAs when operating at nitrogen purities of 95% and higher. PSAs are more robust and less sensitive to hot and cold ambient conditions. Membranes require 160 to 200 psi(11.5-15 kg/cm2) of compressed air for an efficient nitrogen separation to take place. On the other hand, PSAs require a much lower air pressure (115—145PSI / 8-10 kg/cm2) to achieve an efficient separation. Therefore, membranes will result in a higher outlet nitrogen pressure than PSA systems. PSAs generally operate longer with less maintenance costs.
  Membranes have fewer moving parts, but membranes begin to age and degrade over a relatively short period of time. Replacement of membrane modules, represent a significant capital cost to the buyer. The biggest advantage of membrane systems is their inherent lightweight and small footprint.

• 3. How often does the carbon molecular sieve (CMS) need to be replaced?

  The carbon molecular sieve material is extruded from carbonized coconut shells and represents a very hard and durable form of carbon with an exceptionally high propensity for separating compressed air into pure nitrogen product. The CMS material literally has an indefinite life. And like membrane fibers, it too requires protection from compressor oil carry-over. The filtration system in both the PSA and membrane unit is designed to prevent hydrocarbons (especially water vapor) from coming in contact with the CMS material and membrane fibers. Following the recommended filter changes as prescribed in the Owner’s Manual is very important to a long and productive life for both nitrogen generation systems.

• 4. What type of mechanism controls the PSA and membrane?

  The pressure switch is installed in the nitrogen product line inside the control cabinet. The pressure switch can be set to turn the unit off and on at desired product pressure levels.

• 5. What is the purpose of the air receiver and nitrogen storage vessel?

  A PSA Nitrogen Generator is a two-bed absorption system and therefore, has an interrupted air demand to the system when air is diverted from one bed to another. An air surge tank located downstream of the air compressor and upstream of the PSA unit is required in order to smooth out surges in air demand. Membrane systems on the other hand, have a smooth constant demand for air and, otherwise do not necessarily require an air receiver. However, we highly recommend this vessel to accommodate air surges caused by starting and stopping the system. Again, PSA systems require a nitrogen storage vessel in order to insure a smooth product delivery. Membrane systems do not require as large a nitrogen storage vessel, but is still recommended to prevent the system from starting and stopping frequently.

• 6. How to adjust the nitrogen purities?

  The purity adjust valve can be turned up or down to offer lower purity nitrogen at a higher flow rate or higher purity nitrogen at a lower flow rate.

• 7. What type of air filtration system is used for nitrogen and oxygen generation?

  After the compressed air leaves the air dryer, it is filtered in a series of filtration stages. The first and second stages consist of two acetate type filters with a pore space of 0.01 micron. These filters are designed primarily to remove water and particulates in the compressed air. The third and final stage is a high precision oil/water vapor separator designed to eliminate any residual oil or hydrocarbon from the air before it passes into the adsorption vessels.