September 2022 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. These applications will - due to browser restrictions - send data between your browser and our server. If you require more information on the different variants in the SPARTAN range, or you would like to discuss your application in more detail, you can call us on +44 (0) 1670 520055 or send an email to sales@raytecled.comwhere we will happily answer any questions you have. October 2021 Reefer Container Guidance on assessment of hazards is given in NFPA497 (explosive gas) and NFPA499 (dust). The key difference between Divisions and Zones relate to terminations. September 2020 Several protection strategies exist. These areas are in North America (United States and Canada) historically classified with the Class/Division system. See Figure S-1 for an explanation of this marking. The Class/Division/Group system is based on Article 500 of the National Electrical Code (NEC) where. The Zone Classification System is offered as an alternative to the Class and Division system. Electrical equipment can and does cause fires and/or explosions in certain atmospheres. The equipment group . The minimum concentration of oxygen, necessary for the combustion to take place, is called the Limiting Oxygen Concentration. Flameproof "d" - This protection technique is permitted for equipment in the Class I, Zone 1 locations for which it is approved. Ambient Temperature (-20C to +40C if not marked) Establish Zone Based on "IEC 60079-10". IEC 60079-10.1 Classification of areas - Explosive gas atmospheres. Q: Can I use a piece of equipment approved for use in a Division 1 hazardous location in a Division 2 hazardous location? 1910.307 - Hazardous (classified) locations. 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. less than 0.45 mm or MIC ratio is less than 0.40. How to perform Hazardous Area Classification? 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. All rights reserved. There are three zones for gas: Zone 0, Zone 1 and Zone 2. 1.1 Scope. The Zone system has three levels of hazard for gas or dust where the Division system has two. When the concentration of gas or vapor is beneath the LEL the gas mixture is too lean to burn. We don't save this data. A major safety concern in all workplaces is the occurrence of fires and explosions. International Electrotechnical Committee (IEC) Hazardous Area Classification. CUTTING SKIPS 1.1.2 This recommended practice provides information on specific flammable gases and vapors, flammable liquids . January 2022 Then, the level of risk of an explosion is based on the frequency and duration of the occurrence of an explosive atmosphere. The NEC Zone system was created to harmonize with IEC classification system, and therefore reduce the complexity of management. January 2021 Only emails and answers are saved in our archive. Equipment approved for Class I, Division 1 or Class 1, Division 2 shall, in addition to being marked in accordance with (c)(2)(ii), be marked with the following: Class I, Zone 1 or Class I, Zone 2 (as applicable); Applicable gas classification groups; and. ADNOC Many items of EEx rated equipment will employ more than one method of protection in different components of the apparatus. Zone 2 hazardous areas are typically storage areas but can also be process areas. 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. Identifying Zone 0, Zone 1, and Zone 2 Hazardous Areas. gas, vapours, mists and dusts). And safety must be guaranteed in the case of two faults occurring independently of each other. I Flammable gases or vapors may be present, 1 Ignitable concentrations of hazards exist under normal operation conditions and/or where the hazard is caused by frequent maintenance or repair work or frequent equipment failure, E Combustible metal dusts: aluminum, commercial alloys and magnesium, III Easily ignitable fibers or flyings may be present, 0 Ignitable concentrations of flammable gases or vapors which are present continuously or for long periods of time, 1 Ignitable concentrations of flammable gases or vapors which are likely to occur under normal operating conditions; may exist frequently because of repair/maintenance operations or leakage; or equipment is operated in a manner that equipment breakdown/faulty operations could result in the release of ignitable concentrations of flammable gases or vapors and failure of the equipment, 2 Ignitable concentrations of flammable gases or vapors which are not likely to occur under normal operating conditions and if they do will only persist for a short period of time; or volatile flammable liquids, gases, or vapors are confined within closed containers/systems and can escape only as a result of an accidental rupture; or volatile flammable liquids, gases, or vapors are normally prevented by positive mechanical ventilation, but may become hazardous due to system failure, 20 Combustible dusts or ignitable fibers/flyings are present continuously or for long periods of time, 21 Combustible dusts or ignitable fibers/flyings are likely to occur under normal operating conditions; or may exist frequently because of repair/maintenance operations or leakage; or equipment is operated in a manner that breakdown/faulty operations could result in the release of ignitable concentrations of combustible dust or fibers/flyings and failure of the equipment, 22 Combustible dusts or ignitable fibers/flyings are likely to occur under normal operating conditions; or may exist frequently because of repair/maintenance operations or leakage; or equipment is operated in a manner that breakdown/faulty operations could result in the release of ignitable concentrations of combustible dust or fibers/flyings and failure of the equipment, Mines susceptible to firedamp (flammable mixture of gases naturally occurring in a mine, Explosive dusts Group III equipment is subdivided into three subgroups, A Atmospheres containing acetone, ammonia, ethyl alcohol, gasoline, methane, propane, or gases/vapors of equivalent hazard, A Atmospheres containing solid particles and fibers greater than 500 microns that could be suspended in air and settle out, B Atmospheres containing acetaldehyde, ethylene, or gases / vapors of equivalent hazard, B Atmospheres containing combustible dusts other than combustible metal dusts, C Atmospheres containing acetylene, hydrogen, or gases/vapors of equivalent hazard, C Atmospheres containing combustible metal dusts. There are several ways of how to perform hazardous area classification, all described in several standards or codes of practise. September 2018 In the US, the independent National Fire Protection Association (NFPA) publishes several relevant standards, and they are often adopted by government agencies. These areas only become hazardous in case of an accident or some unusual operating condition. NEW METHODS FOR HAZARDOUS AREA CLASSIFICATION FOR EXPLOSIVE GAS . 5: For further information on ventilation, see NFPA 30-2018, Informational Note No. Therefor Hazardous Area Classification (HAC) is the first important step in achieving an explosion safe installation or work environment. Sources of such hazards include gases, vapors, dust, fibers, and flyings, which are combustible or flammable. |MWD/LWD Cabin WELDING INSPECTION Ignition sources can be divided in 13 categories (acc. . Zone 0 describes an area in which a combustible gas will be present continuously while zone 20 describes an area in which combustible dust will be present continuously (the '2' in 'zone 20' indicates dust as opposed to gas). 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 gases, vapours and mists the zone classifications are recognised as Zone 0, Zone 1 and Zone 2 areas. Container Standards 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: 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 . The Zone system has wider use in the chemical and petrochemical industries. In many industrial, commercial, and scientific settings, the presence of such an atmosphere is a common, or at least commonly possible, occurrence. 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. Beside sufficient fuel, also sufficient oxygen is needed for combustion of the mixture. 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. Zones also have the added benefit of including the area classification with the zone description. 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. 2: This classification includes, Informational Note No. Other ignition sources can also be present, like static electricity. according to ISO standard 80079 series. The use of EPL and ATEX Category directly is an alternative for "s" marking. Increased safety "e" -- This protection technique is permitted for equipment in the Class I, Zone 1 locations for which it is approved. Classification of areas and selection of equipment and wiring methods shall be under the supervision of a qualified registered professional engineer. Australia and New Zealand use the same IEC-60079 standards (adopted as AS/NZS60079), however the CE mark is not required. If equipment is marked, for example, Ex e II T4 then it is suitable for all subgroups IIA, IIB and IIC. Outside of the United States, the IEC uses two different classifications: Gas & Vapor (Zones 0, 1, or 2) Dust (Zones 20, 21, or 22) Step 2: The next step is to determine how often the hazardous substance (s) is/are present. 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. Gas a. Informational Note No. In recent years also the EPL is specified for several kinds of protection. The plan may contain the list of chemicals with their group and temperature rating. November 2022 NEC has created an Americanized version of the IEC/CENELEC Zone system in a stand-alone article (Article 505). Please read Google Privacy & Terms for more information about how you can control adserving and the information collected. PROCESS OF CONTAINER Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! In ambient conditions it is assured that oxygen is always present and thus not a factor that has to be incorporated within the hazardous area assessment. 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. There are two sets of Zones: Zones 0 thru 2 are used for gases, vapors, and mists, and Zones 20 thru 22 are . The CE mark is complemented with the Ex mark: A yellow-filled hexagon with the Greek letters (epsilon chi), followed by the Group, Category, and, if Group II, G or D (gas or dust). Zones. 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. November 2021 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.

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