We don't collect information from our users. Flammable atmosphere expected to be present inside the storage tank continuously, hence it has been classified as zone 0. 1: For examples of area classification drawings, see ANSI/API RP 505-2018, Informational Note No. The first thing to understand is that much like the metric vs imperial measuring systems, the United States uses its own methodology which differs from much of the world. So for an explosion there must be enough fuel. The flash-point is the temperature at which the material will generate sufficient quantity of vapor to form an ignitable mixture. PDF Product Bulletin Hazardous Area Classifications September 2019 Group II is for explosive gases (Zone 0, 1 and 2) and Group III is for explosive dusts (Zone 20, 21 and 22). Zone 2. 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). Other ignition sources can also be present, like static electricity. Independent test housesNotified Bodiesare established in most European countries, and a certificate from any of these will be accepted across the EU. Dust or other small particles suspended in air can explode. Entire Vapour space of storage tank. Specific types of protection being used will also be marked. Locations are thus classified by type and risk of release of gas, vapor, or dust. Enclosures can be pressurized with clean air or inert gas, displacing any hazardous substance. For methane this is shown in the following figure. You will find this equipment in paint factories, a warehouse or around a bag dump station. September 2020 Often an area classification plan view is provided to identify equipment ratings and installation techniques to be used for each classified area. area in which an explosive gas atmosphere is present continuously, or for long periods, or frequently (more than 10% of the time). NFPA 70, the National Electrical Code (NEC), defines area classification and installation principles. 1. 1910.307 (g) (2) 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. What are 'Dark Factories,' and Do They Really Exist? Type of protection "n" is further subdivided into nA, nC, and nR. Some of our calculators and applications let you save application data to your local computer. Q: Can equipment approved for a Class I hazardous location be used in a Class II hazardous location? December 2021 In this system, two bare wires were run along the length of a drift, and any miner desiring to signal the surface would momentarily touch the wires to each other or bridge the wires with a metal tool. 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. 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. Within a working area or installation an ignition can be created by many factors. 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. Many items of EEx rated equipment will employ more than one method of protection in different components of the apparatus. Area ClassificationThe max surface temp. In an ordinary household this is of no concern, but if a flammable atmosphere is present, the arc might start an explosion. The key difference between Divisions and Zones relate to terminations. Arcing electrical equipment in unclassified . July 2021 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). Zone 0/20: An area in which an explosive atmosphere is present continuously or for long periods or frequently. Recommendat ions. 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. A room with a propane gas installation will typically be classified with the. Group II is for explosive gases (Zone 0, 1 and 2) and Group III is for explosive dusts (Zone 20, 21 and 22). Each chemical gas or vapour used in industry is classified into a gas group. It is good to be aware of the fact that the mixture of flammable gas with oxygen has an optimum point where the combustion is most severe and leads to the highest explosion pressure. 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. Zone 1: An area in which an explosive atmosphere is likely to occur in normal operation. Equipment that is listed for a Zone 0 location may be installed in a Zone 1 or Zone 2 location of the same gas or vapor. 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". October 2018 | For Gas/Vapor this would be Zone 0. 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. Equipment is non-incendive or non-sparking. SEWAGE TREATMENT area in which an explosive gas atmosphere is likely to occur occasionally in normal operation. What is an Explosion Protection Document? Comparison of Division and Zone Systems - IAEI Magazine Hazardous Area Training: 500 505 API RP - OCS Group In Europe the ATEX 114 Directive (2014/34/EU) is applicable to equipment that is used in hazardous area's. The Zone system has three levels of hazard for gas or dust. FREEZER When the concentration of gas or vapor is above the UEL the gas mixture is too rich to burn. This temperature is used for classification for industry and technology applications.[6]. A major safety concern in all workplaces is the occurrence of fires and explosions. The last requirement for the explosion is the presence of an ignition source, like a spark or hot surface. 11: For information on electric skin effect trace heating for hazardous (classified), Informational Note No. Such areas include a residence or office where the only risk of a release of explosive or flammable gas would be such things as the propellant in an aerosol spray. February 2019 Both external and internal temperatures are taken into consideration. For example the EI 15 and API 500/505 describe specific installations and several conditions for the oil and gas industry. (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. Hazardous Areas - European Classification Standard - Engineering ToolBox Sources of Quick Tips #124.1. And safety must be guaranteed in the case of two faults occurring independently of each other. Is intended for us in Zone 2 (gases) or Zone 22 (dusts). 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. At least two British mine explosions were attributed to an electric bell signal system. WATER TIGHTNESS 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. Temperature classification, except for intrinsically safe apparatus. December 2013, All For more detailed assessments or for situations where no specific industry standards are available , like the chemical or pharmaceutical sector and also specific installation for oil and gas industries, a more quantitative approach can be used. Class I Zone 2 Hazardous Areas. But first, we must consider what is likely to cause an explosion in the first place. Such properties include flame temperature, minimum ignition energy, upper and lower explosive limits, and molecular weight. 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. Zone 0, 1, and 2 locations shall include those specified in 505.5 (B) (1), (B) (2), and (B) (3). the National Fire Protection Association (NFPA) 70, National Electric Code(NEC). Vertical. In effect it is any method which can be shown to have the required degree of safety in use. lk) are places where fire or explosion hazards may exist. Hazardous Area Classification (HAC) is as follows: Definitions of hazardous area are different as per IEC and NEC. When equipment must be placed in a hazardous location, it can be designed to reduce the risk of fire or explosion. The American Petroleum Institute publishes analogous standards in RP500 andRP505. A potential few examples of this are: The air space inside a tank of petrol ". HAZARDOUS AREA HAZARDOUS AREA CLASSIFICATIONS - Academia.edu 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. The codes and standards used in this process provide guidance for selecting,. Identifying Zone 0, Zone 1, and Zone 2 Hazardous Areas - Raytec 2: Through the exercise of ingenuity in the layout of electrical installations for hazardous (classified), Refrigerant machinery rooms that contain ammonia refrigeration systems and are equipped with adequate mechanical ventilation that operates continuously or is initiated by a detection system at a concentration not exceeding 150 ppm shall be permitted to be classified as "unclassified". It is created based on input from the Process Flow Diagrams, Piping & Instrumentation Diagrams and the Equipment Location Plan . 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. with hazardous areas EC-Type Examination Certificate BAS 01 ATEX 7251 , for additional certificates see www.pepperl-fuchs.com Group, category, type of protection II (1) G D [EEx ia] IIB (-20 C Ta 60 C) [circuit(s) in zone 0/1/2] Output EEx ia IIB Voltage U0 25.9 V Current I0 184 mA Power P0 1.2 W Type of protection [EEx ia] Equipment can be designed or modified for safe operation in hazardous locations. This value of this LOC differs per substance and depends also on the inert gas for achieving a low oxygen concentration. Group defines the type of the hazardous material in the surrounding atmosphere. November 2019 Two possible classifications are described, in Section 18 (Zones), and Appendix J (Divisions). Zone 0 (hazardous area) - Oil and Gas Drilling Glossary Examples are: In another blog we, will explain how to perform Hazardous Area Classification according to the Standard EN-IEC 60079-10-1. Dn 2 - a Ce d e r . ), Group F Carbon-based (eg. 2: Where gas detection, Informational Note No. API 500/505 mostly for onshore and offshore oil and gas applications. 1910.307 - Hazardous (classified) locations. | Occupational Safety and Hazardous areas are defined as: " Zones " under worldwide IEC standards (and their local versions, such as ATEX in Europe) " Divisions " under North American NEC standards. When the concentration of methane is beneath the LEL, an explosion cannot occur, even when an ignition source is present. Equipment that is listed for a Zone 1 location may be installed in a Zone 2 location of the same gas or vapor. Several protection strategies exist. . Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! September 2022 July 2022 . . Atmospheres containing combustible flyings. Areas with possible fire or explosion risks due to explosive atmospheres and/or mixtures - are called hazardous (or classified) locations or areas. 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. PDF Australian Hazardous Area Selection Chart - Frsa These would be then labeled with each of the individual methods. 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. The colour of the luminaire body indicates the level of protection. 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). These generally give rise to areas classied as Zones 0, 1, and 2 respectively. 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". [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. December 2020 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. Non-hazardous or ordinary locations. 6: For further information on electrical systems for hazardous (classified), Informational Note No. Area Classification - Hazardous Locations are classified by the likelihood of an ignitable concentration of combustible material being present. Google use cookies for serving our ads and handling visitor statistics. 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. . For dusts: Zone 20, Zone 21 and Zone 22. Group define the type of hazardous material and (partly) the location of the surrounding atmosphere. . Area Classification In Oil And Gas - Safety Notes NEC has created an Americanized version of the IEC/CENELEC Zone system in a stand-alone article (Article 505). Guidance on assessment of hazards is given in NFPA497 (explosive gas) and NFPA499 (dust). * 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 liquids, gases and vapours: Zone 0, Zone 1 and Zone 2. [4], Flammability of combustible liquids are defined by their flash-point. These hazardous (classified) locations are assigned the following designations: For definitions of these locations, see 1910.399. may exist under normal or abnormal conditions because of the presence of flammable gases or vapors, combustible dusts or ignitable fibers or flyings. A high level of protection is ensured. Dn 1 - a Ce e . 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. . Magnesium, Aluminum, Titanium etc. Zone 1 fittings are supplied as silver, Zone 2 as dark grey and industrial fittings as white. Choose the right method for Hazardous Area Classification! Please read AddThis Privacy for more information. 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. There are three zones for gas: Zone 0, Zone 1 and Zone 2. In recent years also the EPL is specified for several kinds of protection. 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. 4: For further information on protection against static electricity and lightning hazards in hazardous (classified). [1] NEC article 500 describes the NEC Division classification system, while articles 505 and 506 describe the NEC Zone classification system. April 2022 The equipment housing may be sealed to prevent entry of flammable gas or dust into the interior. In some cases, it must be certified as meeting that standard. The most standards and codes of practise for Hazardous Area Classification describe typical installations and work environments and their hazardous areas. The hazardous area classification system determines required protection techniques and methods for electrical installations in the location. Documentation requirements likewise vary. Area's are divided into zones. Oil Immersion "o" -- This protection technique is permitted for equipment in the Class I, Zone 1 locations for which it is approved. Refer to Fig.3 which shows the hazardous area zone classification based on hazardous gas release grade. THE PRODUCTS YOU NEED, In many industrial, commercial, and scientific settings, the presence of such an atmosphere is a common, or at least commonly possible, occurrence. All equipment in Division 1 areas must have an approval label, but certain materials, such as rigid metallic conduit, does not have a specific label indicating the Cl./Div.1 suitability and their listing as approved method of installation in the NEC serves as the permission. Whenever you are filling up your tank you are standing in a Zone 1 hazardous area. 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. International Electrotechnical Committee (IEC) Hazardous Area Classification. the inside of tank truck or the interior of a dust filter). Hazardous Area Classification Class I: Zone 0, Zone 1, Zone 2 - LinkedIn Comparisons between the two systems are not easily accomplished. This article is not a substitute for review of current applicable government regulations, industry standards, or other standards specific to your business and/or activities and should not be construed as legal advice or opinion. 15 4. >> For Gas/Vapor this would be Zone 0. Zone 1 - A place in which an explosive atmosphere is likely to occur in normal operation occasionally