hazardous area classification zone 0, 1, 2 hazardous area classification zone 0, 1, 2

Recommendat ions. 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. (1) Zone 0. For example the EI 15 and API 500/505 describe specific installations and several conditions for the oil and gas industry. A60 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. Atmospheres containing non-conductive dust. An area where combustible dusts or ignitable fibers and flyings are present continuously or for long periods of time. 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. CUTTING SKIPS | For Dust this would be Zone 21. 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. 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. Zone 1 is an area in which an explosive atmosphere is likely to occur occasionally in normal operation. Equipment in this category is intended for use in Zone 0 areas (gases) or Zone 20 (dusts), and must ensure a very high level of protection (i.e. National Electrical Code (NEC) and the 1998 Canadian Electrical Code (CEC) now recognize the use of the Zone system for classification of hazardous areas. 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. These areas are in North America (United States and Canada) historically classified with the Class/Division system. As a guide for Zone 0, this can be defined as over 1000 hours/year or >10% of the time. . 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. Some equipment in Division 2 areas do not require a specific label, such as standard 3 phase induction motors that do not contain normally arcing components. The substance referred to by classhas a high probability of producing an explosive or ignitable mixture due to it being present continuously, intermittently, or periodically or fromthe equipment itself under normal operating conditions. 1. 41 gas explosions per year occur within the UK and app. Raytec do not currently offer any lighting solutions for Zone 0. That is why the use of mobile phones on petrol forecourts are banned. February 2022 Hazards in this group gas can be ignited very easily indeed. Arcing electrical equipment in unclassified . Specific types of protection being used will also be marked. (between 0,1 and 10% of the time). (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. 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. 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. Zone 1: An area in which an explosive atmosphere is likely to occur in normal operation. ), Group F Carbon-based (eg. 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. 3: For further information on the classification of, Informational Note No. August 2018 Category 2 equipment may be used in zone 1 or zone 2 areas. . See Figure S-1 for an explanation of this marking. Atmosphere containing carbonaceous dusts, Atmosphere containing combustible dust not included in Group E & F - such as. 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. The types of protection are subdivided into several sub classes, linked to EPL: ma and mb, px, py and pz, ia, ib and ic. This value of this LOC differs per substance and depends also on the inert gas for achieving a low oxygen concentration. SPARTANs Zone 1 part code begins SPX, Zone 2 SPZ and industrial products having a SPI prefix. This concentration is substance specific and lies normally somewhere between the LEL and UEL. 2: This classification includes, Informational Note No. This can be achieved by blanketing with nitrogen or carbondioxide. June 2019 Whenever you are filling up your tank you are standing in a Zone 1 hazardous area. [1] NEC article 500 describes the NEC Division classification system, while articles 505 and 506 describe the NEC Zone classification system. Reefer Container 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. This temperature is used for classification for industry and technology applications.[6]. These generally give rise to areas classied as Zones 0, 1, and 2 respectively. 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. March 2021 The prevention of explosions in working environments is in most countries regulated in national laws and directives. The colour of the luminaire body indicates the level of protection. 1994-2020, W.W. Grainger, Inc. All Rights Reserved. For dusts: Zone 20, Zone 21 and Zone 22. Area Classification. A light switch may cause a small, harmless spark when switched on or off. 1.1.1 This recommended practice applies to those locations where flammable gases or vapors, flammable liquids, or combustible liquids are processed or handled; and where their release into the atmosphere could result in their ignition by electrical systems or equipment. Q: Can equipment approved for a Class I hazardous location be used in a Class II hazardous location? ESS Container NFPA 70 NEC establishes area classifications based on Classes, Divisions and Groups that when combined delineate the hazardous conditions of a specific area. Examples are: production facilities in the food industry, chemical plants, oil & gas, and the pharmaceutical industry etc. 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. When equipment must be placed in a hazardous location, it can be designed to reduce the risk of fire or explosion. LIFTING TEST POSITIVE PRESSURE The temperature classification on the electrical equipment label will be one of the following (in degree Celsius): The above table shows that the surface temperature of a piece of electrical equipment with a temperature classification of T3 will not rise above 200C. FREEZER June 2022 0,1 or 2: II B: I: 1 or 2: C: Acetone Benzene Butane Hexane . Zone 0: flammable atmosphere highly likely to be present - may be present for long periods or even continuously . 2: This classification usually includes, (B) Special Occupancies, Zone 0, 1, and 2 Locations, Article 505 Special Occupancies, Zone 0, 1, and 2 Locations, (B) Special Occupancies, Class I, Zone 0, 1, and 2 Locations, National Electrical Code 2020 of Illinois, National Electrical Code 2017 of Illinois, Ignitible concentrations of flammable gases or vapors are present continuously, Ignitible concentrations of flammable gases or vapors are present for long periods of time, In which ignitible concentrations of flammable gases or vapors are likely to exist under normal operating conditions; or, In which ignitible concentrations of flammable gases or vapors may exist frequently because of repair or maintenance operations or because of leakage; or, In which ignitible concentrations of flammable gases or vapors are not likely to occur in normal operation and, if they do occur, will exist only for a short period; or, In which volatile flammable liquids, flammable gases, or flammable vapors are handled, processed, or used but in which the liquids, gases, or vapors normally are confined within closed containers of closed systems from which they can escape, only as a result of accidental rupture or breakdown of the containers or system, or as a result of the abnormal operation of the, In which ignitible concentrations of flammable gases or vapors normally are prevented by positive mechanical ventilation but which may become hazardous as a result of failure or abnormal operation of the ventilation. The Zone system has three levels of hazard for gas or dust. Refrigerated Container How to perform Hazardous Area Classification? * 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. (Hazardous Area Classification) . Some other standards have more quantitative methods which require more knowledge of the plant, an example is the IEC standard 60079-10-1. There are two sets of Zones: Zones 0 thru 2 are used for gases, vapors, and mists, and Zones 20 thru 22 are . In Northerm America, instead of the zone classification system, the Class/Division system is used. 2) MIC (Minimum Igniting Current) Ratio - The ratio of the minimum current required from an inductive spark discharge to ignite the most easily ignitable mixture of a gas or vapor, divided by the minimum current required from an inductive spark discharge to ignite methane under the same test conditions. December 2022 March 2022 It is created based on input from the Process Flow Diagrams, Piping & Instrumentation Diagrams and the Equipment Location Plan . 1: The term "Class I" was originally included as a prefix to, Informational Note No. Hazardous area classification is a rigorous method of determining where an explosive environment may be present. . Often an area classification plan view is provided to identify equipment ratings and installation techniques to be used for each classified area. Zones also have the added benefit of including the area classification with the zone description. For non-ambient conditions, like process reactors or other enclosed systems, the Limiting Oxygen Concentration is often used for the prevention of explosive atmospheres within those enclosed areas. 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. Hazardous area classification. ". Offshore Living Quarter 11: For information on electric skin effect trace heating for hazardous (classified), Informational Note No. Class defines the general nature (or properties) of the hazardous material in the surrounding atmosphere. April 2021 Then, the level of risk of an explosion is based on the frequency and duration of the occurrence of an explosive atmosphere. IEC 60079-10-1 covers classification of explosive gas atmospheres, and IEC 60079-10-2 explosive dust. ethanol, methane or hydrogen. 1910.307 - Hazardous (classified) locations. 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. Not only are hazardous areas classified by Class (nature of the hazardous material,) and Division . December 2021 Classification of Hazardous Areas 0 100 200 300 400 500 600 T1 >450C T2 >300C 450C T3 >200C 300C T4 >135C 200C . The design of the equipment must ensure protection, even in the event of rare incidents relating to the equipment. 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. 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. Since this fuel can only combust in the presence of oxygen, enough oxygen must be available for the rapid combustion to take place. 5mm -750C Electrical Resistivity. It may exist because of repair, maintenance operations, or leakage. Groups A, B, C, and D are for gases (Class I only). Flour, wood/sawdust, plastic dust), IIC Conductive dusts (eg. 0. | For Gas/Vapor this would be Zone 0. This was accompanied by electrically-initiated explosions of flammable gas such as fire damp (methane) and suspended coal dust. Sources of such hazards include gases, vapors, dust, fibers, and flyings, which are combustible or flammable. That flammable gas or vapor . We will go deeper into ignition assessments in another blog. 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. June 2020 NEC has created an Americanized version of the IEC/CENELEC Zone system in a stand-alone article (Article 505). 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. These applications will - due to browser restrictions - send data between your browser and our server. Upon detection, appropriate action is automatically taken, such as removing power, or providing notification. Area ClassificationThe max surface temp. As mentioned, the first important step of achieving a safe work environment in relation to explosion safety is to identify and classify those areas, where a concentration of flammable gases or vapors within the flammable range can be present. 5: For further information on ventilation, see NFPA 30-2018, Informational Note No. 6: For further information on electrical systems for hazardous (classified), Informational Note No. Marking "EEx d" in Accordance with EN 50 0 14 and 50 018 . Type of protection "n" -- This protection technique is permitted for equipment in the Class I, Zone 2 locations for which it is approved. Equipment is non-incendive or non-sparking. One of the hazards of working with flammable substances is an explosion, mostly hand in hand with fire. May 2019 Each room, section, or area shall be considered individually in determining its classification. 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. The process of determining the type and size of hazardous locations is called classification. A spark or high heat must also be present. Group defines the type of the hazardous material in the surrounding atmosphere. In electrical and safety engineering hazardous locations HazLoc pronounced hazlk are places where fire or explosion hazards may exist. In an ordinary household this is of no concern, but if a flammable atmosphere is present, the arc might start an explosion. 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. Zone 1 fittings are supplied as silver, Zone 2 as dark grey and industrial fittings as white. Click on the zone to learn more about the classification according to IEC 60079-10 standards. Lets take a look at what defines each zone. Zone 2 hazardous areas are typically storage areas but can also be process areas. 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. The Zones are based on how often the hazard is present rather than upon normal versus abnormal conditions. 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". The substance referred to by classhas a low probability of producing an explosive or ignitable mixture and is present only during abnormal conditions for a short period of time - such as a container failure or system breakdown. Entire Vapour space of storage tank. WATER TIGHTNESS gas, vapours, mists and dusts). It uses the familiar Class/Division system and adapts the IEC/CENELEC Zones into it while maintaining NEC wiring methods and . May 2021 Copryright 2023 Springer Controls Company . Container Accessories Informational Note No. Explosion protection must be ensured during normal operation. Zone 1 is an area in which an explosive atmosphere is likely to occur occasionally in normal operation. 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. NEC 2 Divisions (Div 1 2) Division I Comprising of Area Same as Zone 0 1. Also included in the marking are the manufacturers name or trademark and address, the apparatus type, name and serial number, year of manufacture and any special conditions of use. 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. >> For Gas Vapor this would be Zone 1. All rights reserved. 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. . Figures show that appr. Within a working area or installation an ignition can be created by many factors. Determining the Class, Division and Group or Zone and Group is critical to correctly applying the requirements for a given hazardous location. 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. Identifying Zone 0, Zone 1, and Zone 2 Hazardous Areas. taper per foot. See below for further details: Division system sample marking 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. SEWAGE TREATMENT Accommodation Cabin The more hazardous the area to more safety measures have to be taken in order to prevent equipment becoming an effective source of ignition. Group II is for explosive gases (Zone 0, 1 and 2) and Group III is for explosive dusts (Zone 20, 21 and 22). Division II Comprising of Area Same as Zone 2. 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. . No other aspect of safety receives more attention in the form of codes and standards. Equipment is placed into protection level categories according to manufacture method and suitability for different situations. These would be then labeled with each of the individual methods. 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. What is an Explosion Protection Document? Classification of locations, testing and listing of equipment, and inspection of installation, is typically overseen by governmental bodies. >> NEC: Class II, Division 1, Group F. | IEC: Zone 20, Group IIC. What are 'Dark Factories,' and Do They Really Exist? This process is called hazardous area classification. Container Test February 2023 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 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. The most standards and codes of practise for Hazardous Area Classification describe typical installations and work environments and their hazardous areas. Area (mm2) CFD BS EN 60079-10-1:2009 1 5.0 5.0 0.0936 12.3 - 61.7 2 5.0 2.5 0.0326 6.17 - 30.8 Zones. International Electrotechnical Committee (IEC) Hazardous Area Classification. The NEMA enclosure rating or IP code may also be indicated, but it is usually independent of the Classified Area suitability. Area classification is not simply intended to identify hazardous areas on process plants where design has already been completed using only operational and economic factors as influence,. Ways to ensure this level of safety are non-arcing design and limitation of the temperature of the equipment. .14 . Note to paragraph (g)(4) of this section: Low ambient conditions require special consideration. . Equipment approved for use in Class I hazardous locations cannot be used in Class II hazardous locations. Zone 2. Definition of hazardous area zones (AS/NZS 60079.10): Zone 0 Electrical equipment installed in such locations can provide an ignition source, due to electrical arcing, or high temperatures.