481 Parker Hannifin Corporation Fluid Control Division Europe General Catalogue FCDE/0110/UK/V2.0 EXPLOSIVE ENVIRONMENTS Fluid Control Solutions Europe General Catalogue FCSE/0112/UK V2.2 07/2022 DEFINITIONS EXPLOSIVE ENVIRONMENTS Mixture with air, under atmospheric conditions, of flammable substances in the form of gases, vapours, mists or dusts in which, after combustion has occurred, combustion spreads to the entire unburned mixture. HAZARDOUS AREAS A hazardous area is an area in which an explosive gas environment is present, or may be expected to be present, in quantities such as to require special precautions for construction, installation and use of electrical apparatus. INGREDIENTS FOR AN EXPLOSION • When combustible materials are mixed with air, an explosive mixture is produced. Danger of explosion therefore exists wherever these hazardouas materials are handled: such a condition is to be found on the biggest chemical plant as well as at the smallest filling station. • Nowadays with the use of electronic and electrical instrumentation in process control, the risk of combustion by electrical energy has increased sharply. • To protect personnel and expensive equipment special precautions should be taken to prevent combustion of those dangerous substances. Conditions likely to ignite explosive mixtures are as follows: Three conditions are enough to create an explosion. Flames, sparks or hot surfaces Typically oxygen content in air or a combination Substance inflammable Source inflammation Oxygen
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