When a company uses nitrogen to package a product, they must be aware of the safety hazards of oxygen in the head space. They must also make sure that the nitrogen that is pumped into the system does not backflow into the container. Additionally, the inlet and termination point of the system should be placed away from people. When a company uses nitrogen, they should consider the NFPA Code 55-2013 when selecting the right purging system. These systems must be constructed carefully and should follow the technical design of the organization.
There are three main types of nitrogen purging systems. Pressure cycling is the first, and involves using an inert fluid to separate the two. The second type is displacement, and is followed by drying. The third type uses nitrogen as a solvent and involves pushing the liquid out of the pipe. Both of these types are suitable for pipelines. The nitrogen used for a piping system should be clean, free of other substances, and inert.
PSA nitrogen generation plants are primarily comprised of two carbon molecular sieves. The carbon has the ability to absorb oxygen from compressed air. As the nitrogen enriched gas passes through the first adsorber, the oxygen concentration is reduced to all required levels. The second adsorber is depressed to ambient pressure. The nitrogen enriched gas exits the first one. As the nitrogen enriched gas leaves the first, it is replaced by the next one.
