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the purging and pressurization protection technique known as exp is used for electrical equipment to be installed and used in zone 1 2 21 and 22 hazardous locations purging and pressurization involves keeping the flammable substance away from the source of ignition in this animation we will focus on the main principles of the purging and pressurization concept three methods used to maintain the required pressure levels of protection that can be achieved using this protection technique the standard with which equipment using this technique must comply using this protection technique ignition capable electrical equipment is contained within an enclosure that is first purged to flush out the existing gases by submitting the enclosure to a flow of clean air or inert gas the Hazardous substances inside the enclosure are reduced to a level that would be safe in the absence of The Purge then the atmosphere inside the enclosure is pressurized with a non-explosive gas to achieve and maintain a
