Inerting Involves the partial or complete substitution of the air or flammable atmosphere by an inert gas is a very effective method of explosion prevention. Inerting is normally only considered when the flammable or explosive hazard cannot be eliminated by other means i.e., substitution of flammable material with non-flammable, adjustment of process conditions to ensure substances are below flammable limits. Typical uses are within storage tanks where a material may be above its flashpoint and within reactor systems when excursions into flammable atmospheres may occur. A major risk associated with use of inerting is that of asphyxiation, particularly in confined spaces. In those events where people are required to enter a confined space, a formal management control system in the form of a Permit to Work should be in place. In most inerting systems a slight positive pressure should be maintained within the enclosed plant to reduce the possibility of air ingress. Inert gases may be generated on site, or via bulk storage of cylinder facilities.
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