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METHODOLOGY TO UNDERSTAND PROCESS SAFETY TESTING AND BASIS OF SAFETY Flammability testing required Basis of Safety No Can the material form a flammable atmosphere under forseeable condition? Avoidance of flammable atmoshpere Yes Not flammable Dust/Gas Ignition test Avoidance of flammable atmoshpere is the material flammable? Flammable Not too sensitive How sensitive is the matierial to ignition? MIE,MIT,LIT(Dust) MIE,AIT(Gas) Avoidance of Inigtion Source Too Sensitive Venting Explosion Severity (Kst/Pmax)- Dust (Kg/Pmax)-Gas Suppression How severe is the explosion? Containment or MEC( Dust) LEL/UEL (Gas) What are the flammable limits? Avoidance of flammable atmosphere