Abstract
Measurements of the Maximum Experimental Safe Gaps (MESGs) for several flammable gases with oxygen-enriched air are reported. The MESGs for mixtures in air of carbon monoxide and methane and carbon monoxide and water have been measured also. The 20-cm 3 apparatus was used throughout. The results demonstrate that oxygen enrichment has a marked effect on the value of the MESG, which decreases as the oxygen enrichment increases. At high levels of oxygen enrichment very low values of MESG are obtained when the flow of the jet of hot gases through the safe gap becomes sonic. The addition of water to carbon monoxide-air mixtures decreases the MESG rapidly, and the addition of methane to carbon monoxide-air mixtures can give MESGs with values less than those of methane-air and carbon monoxide-air. These results demonstrate the influence of reaction kinetics on the MESG.
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