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IP15 hazardous area classification guidelines

asked Nov 27, 2014 in Safety by cobiesmith (3,310 points)
Can some body provide ip15 hazardous area classification guidelines?

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answered Nov 27, 2014 by ChemKB (8,210 points) | selected Aug 7, 2016 by odadmin
 
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IP 15 provides provides methodologies for hazardous area classification around equipment storing or handling flammable fluids in the production, processing, distribution and retail sectors. [Ref1]

Area clasification or Zoning

Hazardous area classification should be carried out as an integral part of the risk assessment to identify hazardous and non hazardous areas. Hazardous areas are further classified in Zones which distinguish between areas that have a high chance of an explosive atmosphere occurring and those areas where an explosive atmosphere may only occur occasionally or in abnormal circumstances. Following are the definitions of the Zones:

  • Zone 0: The part of a hazardous area in which a flammable atmosphere is continuously present or present for long periods
  • Zone 1: That part of a hazardous area in which a flammable atmosphere is likely to occur in normal operation
  • Zone 2: That part of a hazardous area in which a flammable atmosphere is not likely to occur in normal operation, and if it occurs, it will only exist for a short period
  • Non-hazardous: areas that do not fall into any of the above (IS NOT ‘SAFE AREA’)

Assessing the risk

Risk assessment involves systematic way of identifying hazardous or non-hazardous areas. It should be used to determine if hazardous areas exist and assign zones to those areas. The assessment should consider following: [Ref2]

  • the hazardous properties of the dangerous substances involved;
  • the amount of dangerous substances involved;
  • the work processes, and their interactions, including any cleaning, repair or maintenance activities that will be carried out;
  • the temperatures and pressures at which the dangerous substances will be handled;
  • the containment system and controls provided to prevent liquids, gases, vapours or dusts escaping into the general atmosphere of the workplace;
  • any explosive atmosphere formed within an enclosed plant or storage vessel; and,
  • any measures provided to ensure that any explosive
  • atmosphere does not persist for an extended time, e.g. ventilation.

 

References:

  1. Energy Institute - Hazardous area classification
  2. Health and Safety Executive

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