We don't save this data. Pressurised Container . A light switch may cause a small, harmless spark when switched on or off. For specific industries, the specific codes for that industry are important to use. Some manufacturers claim "suitability" or "built-to" hazardous areas in their technical literature, but in effect lack the testing agency's certification and thus unacceptable for the AHJ (Authority Having Jurisdiction) to permit operation of the electrical installation/system. 2: This classification includes, Informational Note No. Type of protection "n" is further subdivided into nA, nC, and nR. In effect it is any method which can be shown to have the required degree of safety in use. POSITIVE PRESSURE Hazards in this group gas can be ignited very easily indeed. . Class 1/Div 2 ATEX Zone 2 Computers. A major safety concern in all workplaces is the occurrence of fires and explosions. These generally give rise to areas classied as Zones 0, 1, and 2 respectively. Electric equipment depending on the protection techniques described by paragraph (g)(3)(i) of this section may not be suitable for use at temperatures lower than -20 C (-4 F) unless they are approved for use at lower temperatures. . Methane has a UEL of 17 vol%, which means when the concentration of methane in air is above the 17 vol% an explosion cannot occur even when an ignition source is present. In the United States, the hazardous location classification system is defined by the National Fire Protection Association (NFPA) 70, National Electric Code(NEC). . Raytec do not currently offer any lighting solutions for Zone 0. Motors, lighting, junction boxes, electronic equipment, This method, being by definition special, has no specific rules. Powder Filling "q" -- This protection technique is permitted for equipment in the Class I, Zone 1 locations for which it is approved. 15 4. NFPA 70 NEC establishes area classifications based on Classes, Divisions and Groups that when combined delineate the hazardous conditions of a specific area. Article 505 National Electrical Code (NEC), Article 506 National Electrical Code (NEC). It is always balancing between not defining such areas too large (with highly costs for prevention of ignition sources) or too small (unsafe situations). Area classification documentations are reviewed and updated to reflect process changes. Informational Note No. Where there is potential for an explosive atmosphere, special precautions are needed to prevent fires and explosions. MCC Shelter The Zone system has wider use in the chemical and petrochemical industries. September 2018 less than 0.45 mm or MIC ratio is less than 0.40. | For Gas/Vapor this would be Zone 0. Zone 0Ignitable concentrations of flammable gases or vapors which are present continuously or for long periods of time. May 2019 July 2021 Zone 0 Area The definition according to IEC60079-10-1 is "an area in which an explosive gas atmosphere is present continuously or for long periods or frequently". November 2019 Horizontal. Feedback From Clients Class II combustible dusts are grouped into one of three (3) groups: E combustible metal dusts, F combustible carbonaceous dusts or G other combustible dusts. This level of risk is represented by classifying the hazardous area as Zone 0, Zone 1 or Zone 2 (for gas, vapour and mist atmospheres) or Zone 21 or Zone 22 for dust atmospheres. Hazardous Areas - North America Classification, international method of area classification, Protection Techniques for Hazardous Areas - North America, Hazardous because combustible or conductive, Atmosphere containing combustible metal dusts, including. 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). Division 1 and 2 Zone 0, 1 and 2 A (acetylene) IIC (acetylene & hydrogen) B (hydrogen) C (ethylene) IIB (ethylene) For example the EI 15 and API 500/505 describe specific installations and several conditions for the oil and gas industry. This level of risk is represented by classifying the hazardous area as Zone 0, Zone 1 or Zone 2 (for gas, vapour and mist atmospheres) or Zone 21 or Zone 22 for dust atmospheres. 1994-2020, W.W. Grainger, Inc. All Rights Reserved. Hazardous locations can also be described as those locations where electrical equipment See below for further details: Division system sample marking For example, within the U.K. in the Dangerous Substances and Explosive Atmospheres Regulations 2002 (DSEAR) and in the U.S. in the Occupational Safety and Health Act of 1970 (OSHA). The temperature marking may not exceed the ignition temperature of the specific gas or vapor to be encountered. Temperature classification, except for intrinsically safe apparatus. The overpressure is monitored, maintained and controlled. Atmospheres containing propane, acetone, benzene, butane, methane, petrol, hexane, paint solvents or gases and vapors of equivalent hazard. Group is divided in three groups where Group I is reserved for mining locations. . Zone 0/20: An area in which an explosive atmosphere is present continuously or for long periods or frequently. Guidance on assessment of hazards is given in NFPA497 (explosive gas) and NFPA499 (dust). Equipment shall be marked in accordance with paragraph (g)(5)(ii)(A) and (g)(5)(ii)(B) of this section, except as provided in (g)(5)(ii)(C). Several protection strategies exist. Dust or other small particles suspended in air can explode. Recommendat ions. 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. Which Standards to use for Hazardous Area Classification. A potential few examples of this are: The air space inside a tank of petrol Example - Hazardous Area Classification A room with a propane gas installation will typically be classified with the Class/Division system as: Class I, Division 2, Group D Zone system as: Zone 2, Group IIA may exist under normal or abnormal conditions because of the presence of flammable gases or vapors, combustible dusts or ignitable fibers or flyings. Zone 0: flammable atmosphere highly likely to be present - may be present for long periods or even continuously . This leads to a lot of the confusion in the global marketplace because certifying equipment to these different systems can be time consuming and expensive, so many companies may only certify to one or the other. Since this fuel can only combust in the presence of oxygen, enough oxygen must be available for the rapid combustion to take place. The minimum concentration of oxygen, necessary for the combustion to take place, is called the Limiting Oxygen Concentration. Informational Note: For further information regarding classification and ventilation of areas involving closed-circuit ammonia refrigeration systems, see ANSI/IIAR 2-2014. In the IEC standards hazardous areas are classified into zones based upon the frequency and duration of an explosive atmosphere. Flammable liquids with a high flash point are less hazardous than liquids An area where combustible dusts or ignitable fibers and flyings are likely to occur under normal operating conditions. The groups also indicate how much energy is required to ignite the material by energy or thermal effects, with IIA requiring the most energy and IIC the least for zone system gas groups. 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. >> NEC: Class II, Division 1, Group F. | IEC: Zone 20, Group IIC. Class I hazardous locations are identified by zones as follows: * Zone 0 a location in which explosive gas atmospheres are present continuously or for long periods of time. Equipment used in hazardous area must comply to certain Ex standards. Area Classification - Hazardous Locations are classified by the likelihood of an ignitable concentration of combustible material being present. We will go deeper into ignition assessments in another blog. And there are three corresponding zones for dust: Zone 20, Zone 21 and Zone 22. 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. Protecting against fire and explosion is of interest for both personnel safety as well as reliability reasons. Identifying Zone 0, Zone 1, and Zone 2 Hazardous Areas. Category 3 equipment may only be used in zone 2 areas. Refrigerated Container Magnesium, Aluminum, Titanium etc. For dusts: Zone 20, Zone 21 and Zone 22. * Zone 1 a location in which explosive gas atmospheres are likely to occur during normal operation, or which is adjacent to a Zone 0 location. In Europe the ATEX 114 Directive (2014/34/EU) is applicable to equipment that is used in hazardous area's. You will find this equipment in paint factories, a warehouse or around a bag dump station. Dn 1 - a Ce e . Two possible classifications are described, in Section 18 (Zones), and Appendix J (Divisions). Choose the right method for Hazardous Area Classification! The use of EPL and ATEX Category directly is an alternative for "s" marking. So, it is good to know that when a flammable substance concentration exceeds the LEL, it will not automatically lead to an explosion with the highest Pmax. Google use cookies for serving our ads and handling visitor statistics. area in which an explosive gas atmosphere is likely to occur occasionally in normal operation. National Electrical Code (NEC) and the 1998 Canadian Electrical Code (CEC) now recognize the use of the Zone system for classification of hazardous areas. July 2020 CUTTING SKIPS 10/1/20 A hazardous area can be defined as any location where there is risk of an explosion. *unless risk assessment states a higher or lower category is required. Copryright 2023 Springer Controls Company . The Regulations define 3 zones that can exist within a hazardous area: Zone 0 - A place in which an explosive atmosphere is present continuously or for long periods. September 2020 No long-term contract. But first, we must consider what is likely to cause an explosion in the first place. Informational Note No. An area where combustible dusts or ignitable fibers and flyings are not likely to occur under normal operating conditions and do so only for a short period of time. taper per foot. The following content is only related to flammable substances and not to pyrotechnic substances or other instable substances, among those who can decompose. In Northerm America, instead of the zone classification system, the Class/Division system is used. Zone type (0/1/2/ 20/21/ 22) Zone extent. 1: The term "Class I" was originally included as a prefix to, Informational Note No. A list must be drawn up of every explosive material that is on the refinery or chemical complex and included in the site plan of the classified areas. Offshore Workshop Container . In some cases, the hazardous atmosphere is present all the time, or for long periods. Category 1 equipment may be used in zone 0, zone 1 or zone 2 areas. September 2022 Iso Container Quick Tips #124.1. Zone 2 Explosive Mixtures not likely to occur /occur short duration in normal operation (lt10 Hrs/ Yr). Temperature Control 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. The more hazardous the area to more safety measures have to be taken in order to prevent equipment becoming an effective source of ignition. Standards and regulations exist to identify such locations, classify the hazards, and design equipment for safe use in such locations. Group defines the type of the hazardous material in the surrounding atmosphere. Not only are hazardous areas classified by Class (nature of the hazardous material,) and Division . 4: For further information on protection against static electricity and lightning hazards in hazardous (classified). The most standards and codes of practise for Hazardous Area Classification describe typical installations and work environments and their hazardous areas. It may exist because of repair, maintenance operations, or leakage. 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 . A special standard for instrumentation is IEC/EN 60079-27, describing requirements for Fieldbus Intrinsically Safe Concept (FISCO) (zone 0, 1 or 2) (This special standard has been withdrawn, and has been partially replaced by: IEC/EN60079-11:2011 and IEC/EN60079-25:2010)[1], A special standard for instrumentation is IEC/EN 60079-27, describing requirements for Fieldbus Non-Incendive Concept (FNICO) (zone 2) (This special standard has been withdrawn, and has been partially replaced by: IEC/EN60079-11:2011 and IEC/EN60079-25:2010)[9]. It is an Americanized version of the International Electrochemical Commissions (IEC) Zone system which maintains the NEC wiring methods and protection techniques. API 500/505 mostly for onshore and offshore oil and gas applications. 6: For further information on electrical systems for hazardous (classified), Informational Note No. 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. HAZARDOUS VS. October 2022 1: As a guide in determining when flammable gases or vapors are present continuously or for long periods of time, refer to ANSI/API RP 505-2018, Informational Note No. This value of this LOC differs per substance and depends also on the inert gas for achieving a low oxygen concentration. Ex Zone. The American Petroleum Institute publishes analogous standards in RP500 andRP505. Areas with possible fire or explosion risks due to explosive atmospheres and/or mixtures - are called hazardous (or classified) locations or areas. FREEZER The autoignition temperature is the lowest temperature at which the substance will ignite without an additional heat or ignition source (at atmospheric pressure). Zone 1 - A place in which an explosive atmosphere is likely to occur in normal operation occasionally The Class/Division/Group system is based on Article 500 of the National Electrical Code (NEC) where. Refer to Fig.3 which shows the hazardous area zone classification based on hazardous gas release grade. In the United States, the NEC uses 2 different classifications: International Electrotechnical Committee (IEC) Hazardous Area Classification. The hazardous area classification system determines required protection techniques and methods for electrical installations in the location. - Zone 0: An area where an explosive gas-air mixture is continuously present or present for long time (continuous hazard, whose estimated duration is higher than 1000 hours/year) - Zone 1: An area where an explosive gas-air mixture is likely to occur during normal . SIGN UP FOR EMAILGet more great content in your inbox. Adapters shall be used for connection to conduit or NPT-threaded fittings. The design of the equipment must ensure protection, even in the event of rare incidents relating to the equipment. Offshore Living Quarter The Raytec SPARTAN range includes dedicated luminaires for both Zone 1 and Zone 2 areas as well as industrial applications. January 2021 When the concentration of methane is beneath the LEL, an explosion cannot occur, even when an ignition source is present. Zone 1 if gas group & temp. So the following conditions must be met for an explosion to occur: Represented by the following explosion triangle. In some cases, it must be certified as meeting that standard. 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). RP 505 is referred to as the zone system. 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. This is an important factor in the classification of hazardous areas. Figures show that appr. 1) MESG (Maximum Experimental Safe Gap) - The maximum clearance between two parallel metal surfaces that has been found under specified test conditions to prevent an explosion in a test chamber from being propagated to a secondary chamber containing the same gas or vapor at the same concentration. August 2018 Zone 1 - Explosive atmospheres are likely to occur. October 2019 June 2019 Category 2 equipment may be used in zone 1 or zone 2 areas. 7: For further information on application of electrical, Informational Note No. Drop Test July 2019 Atmospheres containing ethylene, propylene oxide, ethylene oxide, butadiene, cyclopropane, ethyl ether, or gases and vapors of equivalent hazard. There are two sets of Zones: Zones 0 thru 2 are used for gases, vapors, and mists, and Zones 20 thru 22 are . Also known as non-hazardous or ordinary locations, these locations are determined to be neither Class I, Division 1 or Division 2; Zone 0, Zone 1 or Zone 2; or any combination thereof. 1.1 Scope. Hazardous classified locations are areas where the possibility of fire or explosion hazards may exist under normal or abnormal conditions because of the presence of flammable, combustible or ignitable gases, vapors, liquids, dust, or fibers/flyings. No representation is made that the information or references are complete or remain current.
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