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Expeltec presentation-gas-groups

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Expeltec presentation-gas-groups

  1. 1. Concept ofGROUPSin Hazardous AreaEx-pert Electrical Technologies
  2. 2. Surface level Surface levelAbove SurfaceBelow SurfaceEx-pert Electrical Technologies
  3. 3. Hazardous AREAIndustrial processes involving Flammable materials, formexplosive atmospheres termed as :The presence of Methane , coal-dust & other gases generate an extremely explosiveatmosphere inside the Coal Mines. Also termed as :Hazardous AREAAbove SurfaceBelow SurfaceEx-pert Electrical Technologies
  4. 4. Flammable materials exist in the form of:•GAS or Vapours•Liquids• powders• Dust•Flyings or fluffExplosive atmosphere is created by :•Methane•Coal dust•A combination of all, known as FIRE DAMPEx-pert Electrical Technologies
  5. 5. For the Flammable materials which exist in the form of:•GAS or Vapours•Liquids• powders• Dust•Flyings or fluffIn order to understand & carry out : Qualitative analysis & Quantitative analysis of the flammable materials Selection of electrical EquipmentsThe idea of GROUPS is employed.The above-surface groups are GROUP II & GROUP IIIEx-pert Electrical TechnologiesIn order to understand & carry out : Qualitative analysis & Quantitative analysis of the flammable materials Selection of electrical EquipmentsThe idea of GROUPS is employed.The below-surface group is GROUP I
  6. 6. GROUP II & GROUP IIIThus the above-surface explosive atmosphere belongs to GROUP IIIf it is an EXPLOSIVE Gas ATMOSPHEREAnd the above-surface explosive atmosphere belongs to GROUP IIIIf it is an EXPLOSIVE DUST ATMOSPHEREEx-pert Electrical TechnologiesGROUP IThe below-surface explosive atmosphere belongs to GROUP I……If it is an EXPLOSIVE ATMOSPHERE created by the presence ofFIREDAMP
  7. 7. GROUP IIGROUP II is further divided into following 3 levels according to the nature of the explosive GASinvolved as manifested through Maximum Experimental Safe Gap (MESG) & Minimum IgnitionCurrent (MIC)1. Group II A2. Group II B3. Group II CGROUP IIIGROUP III is further divided into following 3 levels according to the nature of the explosive DUSTinvolved:-1. Group III A2. Group III B3. Group III CEx-pert Electrical TechnologiesGROUP IThis group is further divided in to following two levels of operation:1. M1 (Equipment Protection Level) Ma2. M2 (Equipment Protection Level) Mb
  8. 8. GROUP II1. Group II A Representative Gas is PROPANE2. Group II B Representative Gas is Ethylene3. Group II C Representative Gas is HydrogenGROUP III1. Group III A Combustible Flyings belong to group IIIA2. Group III B Combustible but non-conductive dust belongs to IIIB3. Group III C Combustible & conductive dust belongs to IIICEx-pert Electrical TechnologiesGROUP IThis group is further divided in to following two levels of operation:1. M1 (Equipment Protection Level) Ma2. M2 (Equipment Protection Level) Mb
  9. 9. Ex-pert Electrical TechnologiesGROUP IThis group is further divided in to following two levels of operation:1. M1 (Equipment Protection Level) Ma2. M2 (Equipment Protection Level) MbGroup IIC is the most explosive and the group IIA is the least
  10. 10. Ex-pert Electrical TechnologiesGROUP IThis group is further divided in to following two levels of operation:1. M1 (Equipment Protection Level) Ma2. M2 (Equipment Protection Level) MbGROUP III1. Group III A Combustible Flyings belong to group IIIA2. Group III B Combustible but non-conductive dust belongs to IIIB3. Group III C Combustible & conductive dust belongs to IIICIt is obvious that combustible flyings & dust represent twofold danger:-1. Danger of FIRE as per nature of the material2. Fire-spread Danger , due to the layer of the material which usually gets deposited inthe area.
  11. 11. Ex-pert Electrical TechnologiesOnce the concept of GROUPS is understood then it becomes easy to selectthe proper Electrical Equipment for Gas or Dust Explosive Atmosphere.The Gas Group of the Area Of Installation should Match with the gas Groupof the Equipment which is being selected.The equipment selection becomes a bit easy.end

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