N2 purging is a process used to remove undesirable gases or contaminants from a vessel or pipeline and replace them with nitrogen gas (N2), which does not react with the product or any equipment in the system. The process continues until the undesired gas or contaminants are removed to an acceptable level and the purity requirement is achieved.

N2 purging of vessels is often done to prepare vessels or pipelines for maintenance or inspection or to remove any hazardous gas or vapors. Overall, N2 purging of vessels is an important process for many industries to ensure product quality, safety, and compliance with regulatory standards.