Acceptance criteria for nitrogen purging
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I would like to ask where the standard for successful nitrogen purging of petrochemical plants, which we usually refer to as an oxygen content of ≤0.5% (v/v), comes from Are there any standard specifications?
It must be related to the specific process requirements. For example, polymerization reactions, the prevention of oxidation for materials that are prone to oxidation, and the requirements for using nitrogen to displace air in workshops where flammable and explosive equipment is used – these all have different requirements; there is no unified standard
We use nitrogen displacement for drying, to reduce the water content inside the equipment below a certain level, based on empirical values.
The standard for the large amount of nitrogen produced by large factories through air separation is an oxygen content of less than 0.5%. If the oxygen content does not meet this standard, it is necessary to switch to another gas source