Hazardous areas are classified into zones based on an assessment of the frequency of the occurrence and duration of an explosive gas atmosphere, as shown in the illustration below. Comparisons between the two systems are not easily accomplished. Have a think about it next time youre filling up! . Atmospheres containing ethylene, propylene oxide, ethylene oxide, butadiene, cyclopropane, ethyl ether, or gases and vapors of equivalent hazard. The codes and standards used in this process provide guidance for selecting,. There are two sets of Zones: Zones 0 thru 2 are used for gases, vapors, and mists, and Zones 20 thru 22 are . The equipment housing may be sealed to prevent entry of flammable gas or dust into the interior. In effect it is any method which can be shown to have the required degree of safety in use. Industrial electrical equipment for hazardous area has to conform to appropriate parts of standard: IEC-60079 for gas hazards, and IEC-61241 for dust hazards. Motors, lighting, junction boxes, electronic equipment, This method, being by definition special, has no specific rules. 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. This value of this LOC differs per substance and depends also on the inert gas for achieving a low oxygen concentration. Often an area classification plan view is provided to identify equipment ratings and installation techniques to be used for each classified area. The basis for the classification into zones is the duration of the presence of the potentially explosive atmosphere: The longer it is present, the more critical the zone. The Hazardous Area Classification presents in this guide is based on the following items as reference: API: API RP 505 Recommended Practice for Classification of Locations for Electrical. PROCESS OF CONTAINER The upper explosion limit of a substance is the highest concentration (in volume percentages for gases and liquids) of a gas or a vapor in air capable of producing a flash of fire in the presence of an ignition source. The required protection level is linked to the intended use in the zones described below: The equipment category indicates the level of protection offered by the equipment. Several protection strategies exist. Determining the Class, Division and Group or Zone and Group is critical to correctly applying the requirements for a given hazardous location. The types of protection are subdivided into several sub classes, linked to EPL: ma and mb, px, py and pz, ia, ib and ic. The NEC Zone system was created to harmonize with IEC classification system, and therefore reduce the complexity of management. This means that the electrical equipment is safe for use within these area by applying special protection strategies. February 2022 Ignitable concentrations of flammable gases or vapors which are likely to occur under normal operating conditions. Safe for the hazardous (classified) location. As to the classification, they are the same. Coal mines, grain mills, elevators, and similar facilities likewise present the risk of a clouds of dust. No representation is made that the information or references are complete or remain current. 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. Class I, Zone 0 = Area Classification, AEx = Symbol for equipment built to American specifications, ia = Type of protection designations, IIC = Gas classification group (as required), T6 = Temperature Classification, [46 FR 4056, Jan. 16, 1981; 46 FR 40185, Aug. 7, 1981; 72 FR 7210, Feb. 14, 2007], Occupational Safety & Health Administration. 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. Intrinsic safety designs equipment to operate using minimal energy, insufficient to cause ignition. 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. |MWD/LWD Cabin NEGATIVE PRESSURE 1: For examples of area classification drawings, see ANSI/API RP 505-2018, Informational Note No. - 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 . Zones 0, 1 and 2: Atmospheres with explosive gases and vapours (AS2380; AS/NZS/IEC 60079) 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". Dry Container 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. Carbon monoxide, ether, hydrogen sulfide, . Raytec do not currently offer any lighting solutions for Zone 0. API 500/505 mostly for onshore and offshore oil and gas applications. Where there is potential for an explosive atmosphere, special precautions are needed to prevent fires and explosions. Adapters shall be used for connection to conduit or NPT-threaded fittings. The flash point determines if an area needs to be classified. hazardous areas as the following: An area where a potential hazard (e.g., a fire, an explosion, etc.) Only emails and answers are saved in our archive. 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. 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. Readers with specific questions should refer to the applicable standards or consult with an attorney. 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. Hazardous Area Classifications D103222X012 Product Bulletin 9.2:001 September 2019. These areas only become hazardous in case of an accident or some unusual operating condition. Group define the type of hazardous material and (partly) the location of the surrounding atmosphere. area in which an explosive gas atmosphere is likely to occur occasionally in normal operation. Zones 1 or 2. A light switch may cause a small, harmless spark when switched on or off. Substances characterization Consequences . No. Workshop Container, Intelligent pressurised container | MUD logging cabin, Battery energy storage system (BESS) container, Laboratory container | workshop container | Equipment containers, Temporary refuge shelter | Toxic gas refuge | Safe haven, Offshore accommodation cabin | office container, Reefer container | Refrigerated container, Intelligent waste water treatment container, IDENTIFYING ZONE 0, ZONE 1, AND ZONE 2 HAZARDOUS AREAS, Temporary refuge (TR) shelter, toxic gas refuge (TGR), Containerised waste water treatment plant. Although every application is different, for the ease of monitoring and specification each hazardous area is classified as a particular level or zone. Identifying Zone 0, Zone 1, and Zone 2 Hazardous Areas. 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. Pit will be considered as Zone 1. The part codes for each SPARTAN variant also differ depending on the level of protection required. Zone 0 is an area in which an explosive atmosphere is present continuously for long periods of time or will frequently occur. 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. You can target the Engineering ToolBox by using AdWords Managed Placements. Class defines the general nature (or properties) of the hazardous material in the surrounding atmosphere. Empirical testing is done to determine parameters such as the maximum experimental safe gap (MESG), minimum igniting current (MIC) ratio, explosion pressure and time to peak pressure, spontaneous ignition temperature, and maximum rate of pressure rise. In the United States, the hazardous location classification system is defined by the National Fire Protection Association (NFPA) 70, National Electric Code(NEC). 286 natural gas explosions per year in the U.S. causing substantial damage, severe injury or loss of lives. . Dn 2 - a Ce d e r . SPARTANs Zone 1 part code begins SPX, Zone 2 SPZ and industrial products having a SPI prefix. A high level of protection is ensured. Group is divided in three groups where Group I is reserved for mining locations. IEC 60079-10.1 Classification of areas - Explosive gas atmospheres. It is essential to know which zone you are working in, so that you can specify the most appropriate equipment. Then, the level of risk of an explosion is based on the frequency and duration of the occurrence of an explosive atmosphere. 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. The value is represented is volume percentage of oxygen. Marking "EEx d" in Accordance with EN 50 0 14 and 50 018 . Atmosphere containing carbonaceous dusts, Atmosphere containing combustible dust not included in Group E & F - such as. Zone type (0/1/2/ 20/21/ 22) Zone extent. SIGN UP FOR EMAILGet more great content in your inbox. Area ClassificationThe max surface temp. As a result, all hazardous area equipment must be designed with hazardous area zone classifications in mind, as the zone governs the level of protection and precaution required. 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". A Zone 1 hazardous area is classified as a place in which an explosive atmosphere consisting of a mixture with air or flammable substances in the form of gas, vapour or mist is likely to occur in normal operation occasionally. All areas in the facility that are not Zone 0, Zone 1, or Zone 2 are considered unclassified. Home About Us News Hazardous Environment Classifications: NEC vs IEC, Posted March 11, 2019 by springercontrols. Which system is preferred depends on the users preference, how the areas are classified, and the wiring system used. National Electrical Code (NEC) and the 1998 Canadian Electrical Code (CEC) now recognize the use of the Zone system for classification of hazardous areas. LIFTING TEST Equipment is non-incendive or non-sparking. But when we take a closer look at the graph and table, we can conclude that any explosion, can easily lead to severe damage. May 2022 Container Accessories Zone 0 is reserved for those areas continuously hazardous (e.g., inside a vented fuel tank), so other Division 1 areas would be classified as Zone 1. The key difference between Divisions and Zones relate to terminations. Refrigerated Container Which Standards to use for Hazardous Area Classification. Comparison of Zones and Divisions. When comparing Divisions and Zones, Division 2 is equivalent to Zone 2, but Division 1 is equivalent to either Zone 0 or 1. less than 0.45 mm or MIC ratio is less than 0.40. Examples are: In another blog we, will explain how to perform Hazardous Area Classification according to the Standard EN-IEC 60079-10-1. 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. These areas are in North America (United States and Canada) historically classified with the Class/Division system. October 2021 Area's are divided into zones. The disadvantage of standards with example installations, is that a huge safety factor is incorporated and thus relative large hazardous area are defined. Groups A, B, C, and D are for gases (Class I only). 2: For Group IIIC combustible dusts or metal combustible fibers/flyings, there shall only be Zone 20 or 21 locations. Arc-producing elements can be isolated from the atmosphere, by encapsulation in, Heat-producing elements can be designed to limit their maximum temperature below the. In an ordinary household this is of no concern, but if a flammable atmosphere is present, the arc might start an explosion. .14 . Refer to Fig.3 which shows the hazardous area zone classification based on hazardous gas release grade. Class defines the type of explosive or ignitable substances which are present in the atmosphere. The Class/Division/Group system is based on Article 500 of the National Electrical Code (NEC) where. Zones. Zone 1 if gas group & temp. The a subdivisions have the most stringent safety requirements, taking into account more than one independent component faults simultaneously. Canada has a similar system with CSA Group standard C22.1, the Canadian Electrical Code, which defines area classification and installation principles. Therefor Hazardous Area Classification (HAC) is the first important step in achieving an explosion safe installation or work environment. 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. Different countries have approached the standardization and testing of equipment for hazardous areas in different ways. In the IEC standards hazardous areas are classified into zones based upon the frequency and duration of an explosive atmosphere. NFPA 70 NEC Articles 500 through 503 cover the requirements for electrical/electronic equipment and wiring for all voltages in Class I, Divisions 1 and 2; Class II, Divisions 1 and 2; and Class III, Divisions 1 and 2 locations. This equipment is intended for use in Zone 1 (gases) or Zone 21 (dusts). In an industrial plant, such as a refinery or chemical plant, handling of large quantities of flammable liquids and gases creates a risk of exposure. The zone classification for gases is divided into three zones, namely Zone 0, Zone 1 and Zone 2 and for dusts Zone 20, Zone 21 and Zone 22. A: When comparing Divisions and Zones, Division 2 is equivalent to Zone 2, but Division 1 is equivalent to either Zone 0 or 1. July 2022 We will go deeper into ignition assessments in another blog. Sources Purged and pressurized -- This protection technique is permitted for equipment in the Class I, Zone 1 or Zone 2 locations for which it is approved. 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). 4: For further information on protection against static electricity and lightning hazards in hazardous (classified). A: Yes. >> For Gas Vapor this would be Zone 1. That flammable gas or vapor . Class I Zone 2 Hazardous Areas. This temperature is used for classification for industry and technology applications.[6]. Get more great content like this sent to your inbox. Flour, wood/sawdust, plastic dust), IIC Conductive dusts (eg. Atmospheres containing combustible flyings. 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. March 2022 The autoignition temperature is the lowest temperature at which the substance will ignite without an additional heat or ignition source (at atmospheric pressure). Lets take a look at what defines each zone. No long-term contract. Zone 0, 1, and 2 locations are those in which flammable gases or vapors are or may be present in the air in quantities sufficient to produce explosive or ignitible mixtures. 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. (Hazardous Area Classification) . 1. The label will always list the class, division and may list the group and temperature code. Q: Can equipment approved for a Class I hazardous location be used in a Class II hazardous location? HAZARDOUS VS. 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. The surface of a high pressure steam pipe may be above the autoignition temperature of some fuel-air mixtures. . National Electrical Code, NFPA 70, Chapter 5, Article 500, 29 CFR 1910 Subpart S, Electrical 1910.307, NFPA 497, "Classification of Gases, Vapors, and Dusts for Electrical Equipment in Hazardous Classified Locations", NFPA Handbook, "Electrical Installations in Hazardous Locations, " by P. J. Schram and M. W. Earley, NFPA 70E, Chapter 5, "Hazardous (Classified) Locations", ANSI/UL 913, "Intrinsically Safe Apparatus", NFPA 496, "Purged and Pressurized Enclosure for Electrical Equipment in Hazardous Locations. For specific industries, the specific codes for that industry are important to use. Zone 2 Explosive Mixtures not likely to occur /occur short duration in normal operation (lt10 Hrs/ Yr). 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. >> For Gas/Vapor this would be Zone 0. April 2021 The colour of the luminaire body indicates the level of protection. Beside the Lower Explosion Limit, each substance also has an Upper Explosion Limit (UEL). Offshore Accommodation Module Hazardous areas are classified into 3 zones based upon the frequency of the occurrence and duration of an explosive gas atmosphere, as follows: Zone 0 Area in which an explosive gas atmosphere is present continuously or for long periods or frequently. Q: Can I use a piece of equipment approved for use in a Division 1 hazardous location in a Division 2 hazardous location? The last requirement for the explosion is the presence of an ignition source, like a spark or hot surface. Standards and regulations exist to identify such locations, classify the hazards, and design equipment for safe use in such locations. THE CURRENT STANDARD . Pressurised Container 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. These areas only become hazardous in case of an accident or some unusual operating condition. 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. These hazardous (classified) locations are assigned the following designations: For definitions of these locations, see 1910.399. 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. Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! February 2019 December 2020 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. Q: Are Divisions and Zones equivalent to one another? 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. The choice of which standard to use for the hazardous area classification is something which is very important. 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. Zone 1 fittings are supplied as silver, Zone 2 as dark grey and industrial fittings as white. January 2022 THE PRODUCTS YOU NEED, Zone 1: An area in which an explosive atmosphere is likely to occur in normal operation. In the United Kingdom, Sira and Baseefa are the most well known such bodies. Ignition sources can be divided in 13 categories (acc. If you want to promote your products or services in the Engineering ToolBox - please use Google Adwords. Gas a. Non-hazardous or ordinary locations. 10: For information on electrical resistance trace heating for hazardous (classified), Informational Note No. The minimum concentration of oxygen, necessary for the combustion to take place, is called the Limiting Oxygen Concentration. Informational Note No. [4], Flammability of combustible liquids are defined by their flash-point. For dusts: Zone 20, Zone 21 and Zone 22. Zones also have the added benefit of including the area classification with the zone description. NFPA 70 NEC uses the familiar Class/Division system and has added an Americanized version of the International Electrochemical Commissions (IEC) IEC Zone system which maintains the NEC wiring methods and protection techniques. Within a working area or installation an ignition can be created by many factors. A Class I, Division 1 or Division 2 location may be reclassified as a Class I, Zone 0, Zone 1, or Zone 2 location only if all of the space that is classified because of a single flammable gas or vapor source is reclassified. A potential few examples of this are: The air space inside a tank of petrol All threaded conduit shall be threaded with an NPT (National (American) Standard Pipe Taper) standard conduit cutting die that provides -in. Class II, Div 2 Class III, Div 1 nR 3G Zone 2 Gc Class III, Div 2 Pressurised Room px 60079-13 2G Zone 1 Gb Zone 21 Db 2D Pressurised Room FM3611 NFPA 496 Class I, Div 1 Class I, Div 2 Class II, Div 1 Class II, Div 2 py 2G Zone 1 Gb pz 3G Zone 2 Gc Zone 22 Dc 3D pv Non-hazardous Gb/GC Optical Radiation op sh 60079-28 1G Zone 0 Ga Zone 20 Da 1D . The most standards and codes of practise for Hazardous Area Classification describe typical installations and work environments and their hazardous areas. Explosion protection must be ensured during normal operation. Hazardous locations can also be described as those locations where electrical equipment d : HA - ha ea OA - oa Area classification - Divisions vs. zones Continuous hazard Intermittent hazard Hazard under abnormal conditions Zone 0 Zone 1 Zone 2 Division 1 Division 1 Division 2 Hazardous locations - CEC classifications Class I 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. Copryright 2023 Springer Controls Company . NFPA 70 NEC establishes area classifications based on Classes, Divisions and Groups that when combined delineate the hazardous conditions of a specific area. The more hazardous the area to more safety measures have to be taken in order to prevent equipment becoming an effective source of ignition. 10/1/20 The American Petroleum Institute publishes analogous standards in RP500 andRP505. Then, the level of risk of an explosion is based on the frequency and duration of the occurrence of an explosive atmosphere. Australia and New Zealand use the same IEC-60079 standards (adopted as AS/NZS60079), however the CE mark is not required. * 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. For Zone 1 applications, Pyroban uses . 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. This rapid expansion of volume is caused by the combustion of a fuel, like e.g. For explosion hazards caused by flammable liquids or gases, the following zones are defined: So a zone 0 is the most hazardous zone and a zone 2 is a less hazardous zone. RP 505 is referred to as the zone system. Zone 0: flammable atmosphere highly likely to be present - may be present for long periods or even continuously . Many items of EEx rated equipment will employ more than one method of protection in different components of the apparatus. a headlamp, rather than a dedicated fixed luminaire. So for an explosion there must be enough fuel. Atmospheres containing acetylene, hydrogen, carbon disulphide or gases and vapors of equivalent hazard. 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). This article covers the requirements for the, Informational Note No. Ignitable concentrations of flammable gases or vapors which are not likely to occur under normal operating conditions and do so only for a short period of time. Quick Tips #124.1. Vertical. December 2013, All Flameproof "d" - This protection technique is permitted for equipment in the Class I, Zone 1 locations for which it is approved. The flash-point is the temperature at which the material will generate sufficient quantity of vapor to form an ignitable mixture. Atmospheres containing non-conductive dust. Subscribe 6.9K views 2 years ago Oil and Gas Zone Classifications: A) Hazardous Area Classification It's cable reimagined No DVR space limits. September 2019 July 2021 Equipment marked as suitable for IIB is also suitable for IIA but NOT for IIC. So yes, it is important to choose the right model and always wonder what am I assessing?. 9: For additional information concerning the installation of, Informational Note No. In the US, the National Electrical Manufacturers Association (NEMA) defines standards for enclosure types for a variety of applications. 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. Under the "Zone" system, hazards are defined for gas as Zone 0, 1 or 2, with 0 as the highest hazard, and for dust as Zone 20, 21 or 22, with 20 as the . Class I, Zone 0 or Zone 1 locations may not abut Class I, Division 1 or Division 2 locations. As a guide for Zone 0, this can be defined as over 1000 hours/year or >10% of the time. February 2021 *unless risk assessment states a higher or lower category is required. October 2018 Choose the right method for Hazardous Area Classification! 5: For further information on ventilation, see NFPA 30-2018, Informational Note No. 1910.307 - Hazardous (classified) locations. 29 CFR 1910.307 Hazardous (classified) Locations 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. API RP 505, Recommended Practice for Classification of Locations for Electrical Installations at Petroleum Facilities Classified as Class I, Zone 0, Zone 1, and Zone 2 (as incorporated by reference in 250.198). 1.1.2 This recommended practice provides information on specific flammable gases and vapors, flammable liquids . Safety is ensured in the event of frequently occurring disturbances or equipment faults which normally have to be taken into account. 14 4. So the following conditions must be met for an explosion to occur: Represented by the following explosion triangle. This paper will discuss and review the current approaches and solutions of dealing with these HSE concerns, especially with the involvement of hazardous and potentially flammable and explosive chemicals.

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