Flammability oxygen enrichment

Although not flammable under normal conditions in air, it is at elevated pressure, or with oxygen enrichment. Explosive limits are reported and reviewed. 

ASTM, STP 1319 (Flammability and Sensitivity of Materials in Oxygen-Enriched Atmospheres), 1997... 

There are many potential causes of explosions and fires at industrial sites handling hazardous substances (a) chemical reactions that produce explosion, fire, or heat (b) ignition of explosive or flammable chemicals (c) ignition of materials due to oxygen enrichment (d) agitation of shock- or friction-sensitive compounds and (e) sudden release of materials under pressure [21,29]. 

If froth is produced by decomposition of an oxidizing agent such as hydrogen peroxide, the oxygen-enriched froth may be flammable and bum rapidly even in a completely inerted vessel (5-9.6.1). 

Flammable mist-vapor-air mixtures may occur as the foam on a flammable liquid collapses.28 Thus, when ignited, many foams can propagate flame. An additional hazard can arise from the production of foams by oxygen-enriched air at reduce pressures. Air confined over a liquid can become oxygen enriched as pressure is reduced because oxygen is more soluble than nitrogen in most liquids. Thus, the presence of foams on combustible liquids is a potential explosion hazard. 

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