Zone 0 Zone 1 Zone 2 Fluid Occurrence of explosive atmosphere Gas mixtures Dust mixtures Not likely to occur or only for short period Zone 2 Zone 22 . July 2020 TLS OFFSHORE CONTAINER Substance properties are specific for the amount of fuel needed to get an explosion when all other conditions are met. 41 gas explosions per year occur within the UK and app. Classification of areas and selection of equipment and wiring methods shall be under the supervision of a qualified registered professional engineer. July 2022 I Flammable gases or vapors may be present, 1 Ignitable concentrations of hazards exist under normal operation conditions and/or where the hazard is caused by frequent maintenance or repair work or frequent equipment failure, E Combustible metal dusts: aluminum, commercial alloys and magnesium, III Easily ignitable fibers or flyings may be present, 0 Ignitable concentrations of flammable gases or vapors which are present continuously or for long periods of time, 1 Ignitable concentrations of flammable gases or vapors which are likely to occur under normal operating conditions; may exist frequently because of repair/maintenance operations or leakage; or equipment is operated in a manner that equipment breakdown/faulty operations could result in the release of ignitable concentrations of flammable gases or vapors and failure of the equipment, 2 Ignitable concentrations of flammable gases or vapors which are not likely to occur under normal operating conditions and if they do will only persist for a short period of time; or volatile flammable liquids, gases, or vapors are confined within closed containers/systems and can escape only as a result of an accidental rupture; or volatile flammable liquids, gases, or vapors are normally prevented by positive mechanical ventilation, but may become hazardous due to system failure, 20 Combustible dusts or ignitable fibers/flyings are present continuously or for long periods of time, 21 Combustible dusts or ignitable fibers/flyings are likely to occur under normal operating conditions; or may exist frequently because of repair/maintenance operations or leakage; or equipment is operated in a manner that breakdown/faulty operations could result in the release of ignitable concentrations of combustible dust or fibers/flyings and failure of the equipment, 22 Combustible dusts or ignitable fibers/flyings are likely to occur under normal operating conditions; or may exist frequently because of repair/maintenance operations or leakage; or equipment is operated in a manner that breakdown/faulty operations could result in the release of ignitable concentrations of combustible dust or fibers/flyings and failure of the equipment, Mines susceptible to firedamp (flammable mixture of gases naturally occurring in a mine, Explosive dusts Group III equipment is subdivided into three subgroups, A Atmospheres containing acetone, ammonia, ethyl alcohol, gasoline, methane, propane, or gases/vapors of equivalent hazard, A Atmospheres containing solid particles and fibers greater than 500 microns that could be suspended in air and settle out, B Atmospheres containing acetaldehyde, ethylene, or gases / vapors of equivalent hazard, B Atmospheres containing combustible dusts other than combustible metal dusts, C Atmospheres containing acetylene, hydrogen, or gases/vapors of equivalent hazard, C Atmospheres containing combustible metal dusts. FREEZER So the flammable range of a substance is the concentration of gases and vapors in air between the Lower Explosion Limit and the Upper Explosion Limit. The disadvantage of standards with example installations, is that a huge safety factor is incorporated and thus relative large hazardous area are defined. Area's are divided into zones. Equipment shall be marked to show the class, group, and operating temperature or temperature range, based on operation in a 40-degree C ambient, for which it is approved. Many people have heard terms like Class I, Division 2, Group E, or ATEX zone 21 but many of our customers only know what certification they require with little understanding of what they mean, so we thought it would be appropriate to write a blog post to help customers understand the broader implications of these terms. July 2019 Group defines thetypeof hazardous material and partly thelocationof the surrounding atmosphere . Hazardous Area Classification (HAC) is as follows: Definitions of hazardous area are different as per IEC and NEC. One of the hazards of working with flammable substances is an explosion, mostly hand in hand with fire. Different countries have approached the standardization and testing of equipment for hazardous areas in different ways. NEC has created an Americanized version of the IEC/CENELEC Zone system in a stand-alone article (Article 505). In this article we will look at what defines Zone 0, Zone 1 and Zone 2 hazardous area classifications and the considerations for specifying lighting into each area. In some cases, the hazardous atmosphere is present all the time, or for long periods. No other aspect of safety receives more attention in the form of codes and standards. Equipment shall be approved not only for the class of location, but also for the ignitable or combustible properties of the specific gas, vapor, dust, or fiber that will be present. Explosions can cause significant damage along with severe injury or worse loss of life. The two general approaches are: Several techniques of flame-proofing exist, and they are often used in combination: Equipment has flameproof gaps (max 0.006" (150m) propane/ethylene, 0.004" (100m) acetylene/hydrogen), Equipment can be installed in ANY housing provided to IP54.A 'Zener Barrier', opto-isolator or galvanic unit may be used to assist with certification. Comments. A Zone defines the general nature - if it is a gas or dust - and the probability of hazardous material being present in an ignitable concentration in the surrounding atmosphere. D8.1.3 Hazardous areas are subdivided into Zones 0,1 or 2, the definitions of each cate-gory being as follows: Zone 0 an area in which an explosive gas-air mixture is continuously present or present for long periods. Non-hazardous or ordinary locations. Unlike ATEX which uses numbers to define the safety "Category" of equipment, namely (1,2 3), the IEC continued to utilise the method used for defining the safe levels of intrinsic safety namely "a" for zone 0, "b" for zone 1 and "c" for zone 2 and apply this Equipment Level of Protection to all equipment for use in hazardous areas since 2009. Flammable liquids with a high flash point are less hazardous than liquids Cookies are only used in the browser to improve user experience. The Zone system of hazardous area classification, defines the probability of the hazardous material, gas, or dust, being present in sufficient quantities that can generate explosive or ignitable mixtures. Where pyrophoric materials are the only materials used or handled, these locations need not be classified. Q: Can I use a piece of equipment approved for use in a Division 1 hazardous location in a Division 2 hazardous location? Classification of locations, testing and listing of equipment, and inspection of installation, is typically overseen by governmental bodies. Zone 1 an area in which an explosive gas-air mixture is likely to occur in normal operating conditions. Zone 2: An area in which an explosive atmosphere is not likely to occur in normal operation, but if it does . Atmospheres containing combustible flyings. Division defines the probability of the hazardous material being present in an ignitable concentration in the surrounding atmosphere. Sources of such hazards include gases, vapors, dust, fibers, and flyings, which are combustible or flammable. Equipment that is listed for a Zone 1 location may be installed in a Zone 2 location of the same gas or vapor. December 2013, All The Zone system is based on Article 505/506 of the National Electrical Code (NEC) and follows the international method of area classification as developed by the International Electrotechnical Commission (IEC). Readers with specific questions should refer to the applicable standards or consult with an attorney. Magnesium, Titanium), IIB Nonconductive dusts (eg. class correct, Motors, lighting, junction boxes, electronics, Equipment is very robust and components are made to a high quality, Equipment components are completely submerged in oil, Equipment components are completely covered with a layer of sand, powder or quartz, Equipment components of the equipment are usually encased in a resin type material. of So it is quite obvious that explosions should be prevented as much as possible and still work has to be done to achieve this. Iso Container Therefore, it is very important to make sure that you are using a suitable luminaire for your application by choosing your fitting based on its suitability for the Zone in which it will be located. December 2020 To prevent explosions from happening in harsh environments whereby flammable gases or combustible dusts are present directives and guidelines are put in place to protect both the public, workforce, and environment. The choice of which standard to use for the hazardous area classification is something which is very important. Raytec do not currently offer any lighting solutions for Zone 0. It may exist because of repair, maintenance operations, or leakage. Area classification is not simply intended to identify hazardous areas on process plants where design has already been completed using only operational and economic factors as influence,. Division 2 is equivalent to Zone 2, while Division 1 is either Zone 0 or 1. Temperature Control The Class/Division/Group system is based on Article 500 of the National Electrical Code (NEC) where. * Zone 2 a . Then, the level of risk of an explosion is based on the frequency and duration of the occurrence of an explosive atmosphere. IECEx Karandikar Certification The last requirement for the explosion is the presence of an ignition source, like a spark or hot surface. In the United States, the most commonly followed system is the NEC (National Electric Code), while the rest of the world generally follows the IEC (International Electrotechnical Commission). Group is divided in three groups where Group I is reserved for mining locations.
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