It is essential to know which zone you are working in, so that you can specify the most appropriate equipment. ADNOC A hazardous area classification drawing (also known as an area classification drawing) outlines the classifications of areas where flammable liquids, gasses or vapors are handed, processed or stored. October 2018 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. Zone 0 (hazardous area) An area in which an explosive gas-air mixture is continuously present or present for long periods. Exception No. . It is an Americanized version of the International Electrochemical Commissions (IEC) Zone system which maintains the NEC wiring methods and protection techniques. For Zone 1 applications, Pyroban uses . In Europe the label must show the CE mark and the code number of the certifying/notified body). So yes, it is important to choose the right model and always wonder what am I assessing?. Accommodation Cabin This is because Zone 0 usually classifies areas for gas storage or containment, and any lighting required would be used on a small and portable basis for visual inspection, e.g. Therefor Hazardous Area Classification (HAC) is the first important step in achieving an explosion safe installation or work environment. Dn 1 - a Ce e . This article covers the requirements for the, Informational Note No. IEC 60079-10.1 Classification of areas - Explosive gas atmospheres. Examples are: production facilities in the food industry, chemical plants, oil & gas, and the pharmaceutical industry etc. Equipment meeting one or more of the protection techniques described in paragraph (g)(3) of this section shall be marked with the following in the order shown: Class, except for intrinsically safe apparatus; Zone, except for intrinsically safe apparatus; Occupational Safety and Health Administration, Outreach Training Program (10- and 30-hour Cards), OSHA Training Institute Education Centers, Severe Storm and Flood Recovery Assistance. Equipment of the nonheat-producing type, such as junction boxes, conduit, and fittings, and equipment of the heat-producing type having a maximum temperature not more than 100 C (212 F) need not have a marked operating temperature or temperature range; Electric equipment suitable for ambient temperatures exceeding 40 C (104 F) shall be marked with both the maximum ambient temperature and the operating temperature or temperature range at that ambient temperature; and. the National Fire Protection Association (NFPA) 70, National Electric Code(NEC). Controls can be fitted to detect dangerous concentrations of hazardous gas, or failure of countermeasures. Hazardous area equipment is categorized into category-1 for Zone 0 or Zone 20, category-2 for Zone 1 or Zone 21, and category-3 for Zone 2 or Zone 22. 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. The NEMA enclosure rating or IP code may also be indicated, but it is usually independent of the Classified Area suitability. Zone 1 if gas group & temp. To make this even easier to understand, take a look at the diagram of a typical petrol station below where we have identified the areas that are classified as Zone 0, Zone 1 and Zone 2. See Figure S-1 for an explanation of this marking. FREEZER Magnesium, Titanium), IIB Nonconductive dusts (eg. Zone 1 - A place in which an explosive atmosphere is likely to occur in normal operation occasionally The following Equipment Groups and Categories are applicable: Equipment in this category is only intended for use in the underground areas of mines, as well as those areas of surface installations of such mines endangered by firedamp and/or combustible dusts. Equipment construction is such that it can withstand an internal explosion and provide relief of the external pressure via flamegap(s) such as the labyrinth created by threaded fittings or machined flanges. Group II is for explosive gases (Zone 0, 1 and 2) and Group III is for explosive dusts (Zone 20, 21 and 22). (between 0,1 and 10% of the time). For equipment with metric threaded entries, such entries shall be identified as being metric, or listed adaptors to permit connection to conduit of NPT-threaded fittings shall be provided with the equipment. 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. Sources of But every hazardous area is different and each has specific requirements depending on the nature of the atmosphere and the elements that are present. Container Accessories Drop Test EN 16985 concerning spray cabins and powder coating cabins, EN 12779 related to extraction systems for hot sawdust and chips, EN 60079-10 series, 2020 version for gas and dust explosion hazard, NPR 7910 series for gas and dust explosion hazard based on EN 60079-10-1, 2015 version, EN 13617 for fuel dispensers at filling stations. This process is called hazardous area classification. You will find this equipment in paint factories, a warehouse or around a bag dump station. Terminology for both hazards and protective measures can vary. So for an explosion there must be enough fuel. However, at low ambient temperatures, flammable concentrations of vapors may not exist in a location classified Class I, Zone 0, 1, or 2 at normal ambient temperature. The plan may contain the list of chemicals with their group and temperature rating. SEWAGE TREATMENT Hazardous areas are classified into zones based on an assessment of the frequency of the occurrence and duration of an explosive gas atmosphere, as follows: Zone 0: An area in which an. 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. Zone 0 is an area in which an explosive atmosphere is present continuously for long periods of time or will frequently occur. Comparisons between the two systems are not easily accomplished. At least two British mine explosions were attributed to an electric bell signal system. Google use cookies for serving our ads and handling visitor statistics. July 2019 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]. Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro .Add the Engineering ToolBox extension to your SketchUp from the SketchUp Pro Sketchup Extension Warehouse! Note to paragraph (c)(3) of this section: The National Electrical Code, NFPA 70, contains guidelines for determining the type and design of equipment and installations that will meet this requirement. In the United States, the NEC uses 2 different classifications: Class defines the type of explosive or ignitable substances which are present in the atmosphere. That flammable gas or vapor . NEC 2 Divisions (Div 1 2) Division I Comprising of Area Same as Zone 0 1. The IEC standard EN 60079-33 is made public and is expected to become effective soon, so that the normal Ex certification will also be possible for Ex-s, Zone depending upon manufacturer's certification, explosive atmosphere between 10 and 1000 hrs/yr, explosive atmosphere between 1 and 10 hrs/yr, explosive surface between 10 and 1000 hrs/yr, explosive surface between 1 and 10 hrs/yr, Certified and labeled for use in indoor locations rated NEC Class I, Groups A, B, C, and D, Certified and labeled for use in locations rated NEC Class I, Groups A, B, C, and D; both indoors and outdoors, Certified and labeled for use in locations rated NEC Class II, Groups E, F, or G, Explosion protected, Group 2, Category 1, Gas, Type ia, Group 2C gases, Temperature class 4, Type n, non-sparking, Group 2 gases, Temperature class 3, special conditions apply. Zone 2 is a place in which an explosive atmosphere is not likely to occur in normal operation but, if it does occur, will persist for a short period only. National Electrical Code (NEC) and the 1998 Canadian Electrical Code (CEC) now recognize the use of the Zone system for classification of hazardous areas. Hazardous Area Classification is a study, in which is assessed, at witch locations of a plant, factory or company, high concentrations of flammable gases are present or can be released, in order to create an explosion hazard. 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. Zone 1 an area in which an explosive gas-air mixture is likely to occur in normal operating conditions. Hazards in this group gas can be ignited very easily indeed. In the United States, the hazardous location classification system is defined by the National Fire Protection Association (NFPA) 70, National Electric Code(NEC). 1: As a guide to classification of Zone 22 locations, refer to ANSI/ISA 60079-10-2 (12.10.05)-2013, Explosive Atmospheres Part 10-2: Classification of areas Combustible dust atmospheres. September 2019 the inside of tank truck or the interior of a dust filter). 3: For further information on the classification of, Informational Note No. CUTTING SKIPS The part codes for each SPARTAN variant also differ depending on the level of protection required. Shown below is a summary of the applicable NEC Articles to reference to ensure the proper requirements are applied. There are four zones in the IEC classification system: Zone 0: An area in which an explosive atmosphere is present continuously or for long periods. .14 . These generally give rise to areas classied as Zones 0, 1, and 2 respectively. Equipment is pressurised to a positive pressure relative to the surrounding atmosphere with air or an inert gas, thus the surrounding ignitable atmosphere can not come in contact with energized parts of the apparatus. December 2022 Substances characterization Consequences . An oversimplification of this example is shown in Table 1. Encapsulation "m" -- This protection technique is permitted for equipment in the Class I, Zone 1 locations for which it is approved. 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. Atmosphere containing a flammable gas, a flammable liquid produced vapor, or a combustible liquid produced vapor mixed with air that may burn or explode, having either a MESG (Maximum Experimental Safe Gap)1) value less than or equal to 0.45 mm or aMIC (Minimum Igniting Current)2) ratio less than or equal to 0.40 - such as hydrogen or fuel and combustible process gases containing more than 30% hydrogen by volume - or gases of equivalent hazard such as butadiene, ethylene oxide, propylene oxide and acrolein. This means that the electrical equipment is safe for use within these area by applying special protection strategies. Atmospheres containing combustible flyings. Wide known is that al electrical equipment within hazardous areas must be Ex certified for use in the appropriate hazardous area (zone or class/division). One of the hazards of working with flammable substances is an explosion, mostly hand in hand with fire. PROCESS OF CONTAINER There are three zones for gas: Zone 0, Zone 1 and Zone 2. Motors, lighting, junction boxes, electronic equipment, This method, being by definition special, has no specific rules. A Zone 0 location is a location in which one of the following . Group defines thetypeof hazardous material and partly thelocationof the surrounding atmosphere . All threaded conduit shall be threaded with an NPT (National (American) Standard Pipe Taper) standard conduit cutting die that provides -in. The Zones are based on how often the hazard is present rather than upon normal versus abnormal conditions. Hazardous Area Classification (HAC) is as follows: Definitions of hazardous area are different as per IEC and NEC. Home About Us News Hazardous Environment Classifications: NEC vs IEC, Posted March 11, 2019 by springercontrols. LIFTING TEST These applications will - due to browser restrictions - send data between your browser and our server. February 2019 The International Electrotechnical Commission publishes the 60079 series of standards[2] which defines a system for classification of locations, as well as categorizing and testing of equipment designed for use in hazardous locations, known as "Ex equipment". Type of protection "n" -- This protection technique is permitted for equipment in the Class I, Zone 2 locations for which it is approved. This can be achieved by blanketing with nitrogen or carbondioxide. [10][11] Some of these are specifically for hazardous locations: All equipment certified for use in hazardous areas must be labelled to show the type and level of protection applied. *unless risk assessment states a higher or lower category is required. Youre phone isnt rated for use in hazardous areas. February 2021 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). (equivalent to NEC Class I, Groups A and B), (equivalent to NEC Class II, Groups F and G), Group IIC is the most severe zone system gas group. Gas a. Feedback From Clients NFPA 70 NEC Zone Classification System The Zone Classification System is offered as an alternative to the Class and Division system. The Zone system has wider use in the chemical and petrochemical industries. Division defines the likelihood of the hazardous material being present in an explosive or ignitable concentration.Class I flammable gases and vapors are grouped into one of four groups(Groups A, B, C or D)based on their physical properties and the ease in which they can be ignited. The choice of which standard to use for the hazardous area classification is something which is very important. Equipment that is safe for the location shall be of a type and design that the employer demonstrates will provide protection from the hazards arising from the combustibility and flammability of vapors, liquids, gases, dusts, or fibers involved. Table 1. The four steps involved in hazardous area classification are: Determine the type of hazard or "class" that might be presentcombustible gas (Class I), combustible dust (Class II), or fibers (Class III). Note to paragraph (c)(2)(i) of this section: NFPA 70, the National Electrical Code, lists or defines hazardous gases, vapors, and dusts by "Groups" characterized by their ignitable or combustible properties. 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. March 2022 Source: Rules and Regulations for the Classification of Mobile Offshore Units, Part 7, Safety Systems, Hazardous Areas and Fire, June 2013, Lloyd's Register, Global Standards. For example, in the US by the Occupational Safety and Health Administration. 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. The information contained in this article is intended for general information purposes only and is based on information available as of the initial date of publication. Equipment that the employer demonstrates will provide protection from the hazards arising from the flammability of the gas or vapor and the zone of location involved and will be recognized as providing such protection by employees need not be marked. The inductance of the signal bell coils, combined with breaking of contacts by exposed metal surfaces, resulted in sparks, causing an explosion. No long-term contract. 1910.307 (g) (2) August 2020 The use of EPL and ATEX Category directly is an alternative for "s" marking. The Zone Classification System is offered as an alternative to the Class and Division system. Group C materials have a MESG less than 0.75mm and a MIC ratio less than 0.80 (but greater than 0.40, which would put it in Group B.) For example, a Class 1, Div 1 area where Group A may be present would be defined as an area where flammable gases or vapors may be present under normal operating conditions. If equipment has been approved for use in a Division 1 hazardous location, it can be used in a Division 2 hazardous location, providing it is in the same class and group. The specific hazardous materials within each group and their automatic ignition temperatures can be found in Article 500 of the National Electrical Code and in NFPA 497. Offshore Accommodation Module The American Petroleum Institute publishes analogous standards in RP500 andRP505. Category 1 equipment may be used in zone 0, zone 1 or zone 2 areas. The Occupational Safety and Health Administration (OSHA) has adopted these hazardous classifications and all except Groups are defined in 29 Code of Federal Register (CFR) 1910.399. For example the EI 15 and API 500/505 describe specific installations and several conditions for the oil and gas industry. March 2021 You can target the Engineering ToolBox by using AdWords Managed Placements. Equipment marked as suitable for Group IIC is also suitable for IIB and IIA. Offshore Living Quarter All rights reserved. ), Group F Carbon-based (eg. Electrical equipment can and does cause fires and/or explosions in certain atmospheres. Type of protection "n" is further subdivided into nA, nC, and nR. Informational Note: For further information regarding classification and ventilation of areas involving closed-circuit ammonia refrigeration systems, see ANSI/IIAR 2-2014. Zone 0, 1, and 2 locations shall include those specified in 505.5 (B) (1), (B) (2), and (B) (3). 6: For further information on electrical systems for hazardous (classified), Informational Note No. Zone defines thegeneral nature if it is a gas or dust and theprobabilityof hazardous material being present in an ignitable concentration in the surrounding atmosphere. Determining the Class, Division and Group or Zone and Group is critical to correctly applying the requirements for a given hazardous location. Oil Immersion "o" -- This protection technique is permitted for equipment in the Class I, Zone 1 locations for which it is approved. It may exist because of repair, maintenance operations, or leakage. Q: Are Divisions and Zones equivalent to one another? . Hazardous Area Classification, Gas Vapours and Dust Groups, Temperature Class | Simple Science Simple Science 8.81K subscribers Join Subscribe 28K views 2 years ago This video explains. We will go deeper into ignition assessments in another blog. May 2019 Atmosphere containing a flammable gas, a flammable liquid produced vapor or a combustible liquid-produced vapor whose MESG is greater than 0.75 mm or MIC ratio is greater than 0.40 and less than 0.80 - such as carbon monoxide, ether, hydrogen sulfide, morphline, cyclopropane, ethyl, isoprene, acetaldhyde and ethylene or gases of equivalent hazard. Equipment in this category is intended for use in areas in which explosive atmospheres caused by gases, vapours, mists or air/dust mixtures are likely to occur occasionally. Atmosphere containing flammable gas, flammable liquid produced vapor, or combustible liquid produced vapor mixed with air that may burn or explode, having either a MESG value greater than 0.75 mm or a MIC ratio greater than 0.80 - such as gasoline, acetone, ammonia, benzene, butane, ethanol, hexane, methanol, methane, vinyl chloride, natural gas, naphtha, propane or gases of equivalent hazard. July 2020 September 2021 Refrigerated Figures show that appr. Beside sufficient fuel, also sufficient oxygen is needed for combustion of the mixture. Since the changes to the code, hazardous locations with gases or vapors (Class I) present can be reclassified as Zone 0, 1 or 2. . gas, vapours, mists and dusts). The definition of the hazardous area zones represent the likelihood of hazardous gas, dust or other hazards being present in a working area. What are 'Dark Factories,' and Do They Really Exist? Division 1 and 2 Zone 0, 1 and 2 A (acetylene) IIC (acetylene & hydrogen) B (hydrogen) C (ethylene) IIB (ethylene) The IEC 60079 standard set has been adapted for use in Australia and New Zealand and is published as the AS/NZS 60079 standard set. Class I Zone 2 Hazardous Areas. . Informational Note No. a headlamp, rather than a dedicated fixed luminaire. Get more great content like this sent to your inbox. CLASSIFIED LOCATIONS: AREA CLASSIFICATION: AREA CLASSES: AREA GROUPS: LOCATION AS PER DIVISIONS: DIVISION 1 - Class I, Division 1 hazardous locations are defined (as per NEC code Article 500) as follows: DIVISION 2 - Class I Division 2 Locations are as follows: Area Classification by ZONES: DEFINITIONS: HAZARDOUS LOCATIONS: However, the following provisions modify this marking requirement for specific equipment: Fixed lighting fixtures marked for use in Class I, Division 2 or Class II, Division 2 locations only need not be marked to indicate the group; Fixed general-purpose equipment in Class I locations, other than lighting fixtures, that is acceptable for use in Class I, Division 2 locations need not be marked with the class, group, division, or operating temperature; Fixed dust-tight equipment, other than lighting fixtures, that is acceptable for use in Class II, Division 2 and Class III locations need not be marked with the class, group, division, or operating temperature; and. 11: For information on electric skin effect trace heating for hazardous (classified), Informational Note No. The a subdivisions have the most stringent safety requirements, taking into account more than one independent component faults simultaneously. These are typically process areas where gases are more likely to be present. taper per foot. Equipment is non-incendive or non-sparking. To minimize the risk of these fires or explosions, electrical/electronic equipment must be designed, tested and labeled as being acceptable for use in the areas in which it is installed. 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 . . The most standards and codes of practise for Hazardous Area Classification describe typical installations and work environments and their hazardous areas. The NEC Zone system was created to harmonize with IEC classification system, and therefore reduce the complexity of management. Zone 0, 1 2 . Atmosphere containing carbonaceous dusts, Atmosphere containing combustible dust not included in Group E & F - such as. Refer to Fig.3 which shows the hazardous area zone classification based on hazardous gas release grade. These areas are in North America (United States and Canada) historically classified with the Class/Division system. Although every application is different, for the ease of monitoring and specification each hazardous area is classified as a particular level or zone. Employers may use the zone classification system as an alternative to the division classification system for electric and electronic equipment and wiring for all voltage in Class I, Zone 0, Zone 1, and Zone 2 hazardous (classified) locations where fire or explosion hazards may exist due to flammable gases, vapors, or liquids. The definition of Zone 2 is a hazardous area classified as an atmosphere where a mixture of air and flammable substances in the form of gas, vapour or mist is not likely to occur in normal operation, but if it does occur, will persist for a short period only. In the IEC standards hazardous areas are classified into zones based upon the frequency and duration of an explosive atmosphere. An explosion is a rapid expansion in volume associated with an extremely vigorous outward release of energy, usually with the generation of high temperatures and release of high-pressure gases (wikipedia (https://en.wikipedia.org/wiki/Explosion). The disadvantage of standards with example installations, is that a huge safety factor is incorporated and thus relative large hazardous area are defined. 2: For the requirements for electrical and electronic. Zone Hazardous Location 2 Table of . | For Dust this would be Zone 22. Note to paragraph (g)(4) of this section: Low ambient conditions require special consideration. The escaping (hot) gases must sufficiently cool down along the escape path that by the time they reach the outside of the enclosure not to be a source of ignition of the outside, potentially ignitable surroundings. Powder Filling "q" -- This protection technique is permitted for equipment in the Class I, Zone 1 locations for which it is approved. Zone 2 is a place in which an explosive atmosphere is not likely to occur in normal operation but, if it does occur, will persist for a short period only. Flour, wood/sawdust, plastic dust). Much early equipment having Ex s protection was designed with encapsulation and this has now been incorporated into IEC 60079-18 [Ex m]. area in which an explosive gas atmosphere is not likely to occur in normal operation, but, if it does occur, will exist for a short period only (less than 0,1% of the time), Window breakage, cracks plaster, light damage to buildings, Collapse of wood or asbestos siding of homes, Collapse of walls made of concrete blocks, Reinforced concrete structures severely damaged, Flames and hot gases (including hot particles), Mechanically generated impact, friction and abrasion, Stray electric currents, cathodic corrosion protection, Radio frequency (RF) electromagnetic waves from 10, Exothermic reactions, including self-ignition of dusts, EI 15 Energy Institute 15, mostly for on- and offshore oil and gas applications. Container Standards In general, all types of equipment installed within the hazardous area shall be . As world trade becomes more globalized, international standards are slowly converging, so that a wider range of acceptable techniques can be approved by national regulatory agencies. With the advent of electric power, electricity was introduced into coal mines for signaling, illumination, and motors. The overpressure is monitored, maintained and controlled. This rapid expansion of volume is caused by the combustion of a fuel, like e.g. Each chemical gas or vapour used in industry is classified into a gas group. The conduit shall be made wrench tight to prevent sparking when fault current flows through the conduit system and to ensure the explosionproof or flameproof integrity of the conduit system where applicable. lk) are places where fire or explosion hazards may exist. Specific types of protection being used will also be marked. In instances of areas within the same facility classified separately, Class I, Zone 2 locations may abut, but not overlap, Class I, Division 2 locations. 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. Zones 1 or 2. Two possible classifications are described, in Section 18 (Zones), and Appendix J (Divisions).

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