When establishing our Hazardous Locations (HAZLOC) we utilize a Recognized And Generally Accepted Good Engineering Practice (RAGAGEP) such as NFPA 497, Recommended Practice for the Classification of Flammable Liquids, Gases, or Vapors and of Hazardous (Classified) Locations for Electrical Installations in Chemical Process Areas or there is also API RP500, Recommended Practice for Classification of Locations for Electrical Installations at Petroleum Facilities Classified as Class I, Division 1 and Division 2. Both of these RAGAGEPs manage flanges and fittings in a similar manner but I will use NFPA 497 in this article as it is more widely used.
Pipe flanges, screwed connections, fittings, valves, meters, etc. and our Hazardous Locations
