Subscribe 6.9K views 2 years ago Oil and Gas Zone Classifications: A) Hazardous Area Classification It's cable reimagined No DVR space limits. Zone 1: An area in which an explosive atmosphere is likely to occur in normal operation. The surface of a high pressure steam pipe may be above the autoignition temperature of some fuel-air mixtures. Requirements for good HAC Drawings and Plans. of the autoignition temperature of the hazardous atmosphere. (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. It is an Americanized version of the International Electrochemical Commissions (IEC) Zone system which maintains the NEC wiring methods and protection techniques. This is also one of the first steps when composing an Explosion Protection Document. 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. 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 class correct, Motors, lighting, junction boxes, electronics, Equipment is very robust and components are made to a high quality, Equipment components are completely submerged in oil, Equipment components are completely covered with a layer of sand, powder or quartz, Equipment components of the equipment are usually encased in a resin type material. Get more great content like this sent to your inbox. Hazardous areas are those defined as areas of potential explosion risk due to the presence of flammable gas or vapor. Ex s is a coding referenced in IEC 60079-0. When the concentration of gas or vapor is above the UEL the gas mixture is too rich to burn. November 2020 See below for further details: Division system sample marking Marking "EEx d" in Accordance with EN 50 0 14 and 50 018 . In an ordinary household this is of no concern, but if a flammable atmosphere is present, the arc might start an explosion. . CUTTING SKIPS 0. 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. For gases, vapours and mists the zone classifications are recognised as Zone 0, Zone 1 and Zone 2 areas. July 2019 Well recognized and clear IEC Standard IEC 60079-10-2:2015 Hazardous Area Classification for explosive dusts Significant influence on spending's for safety . Explosion-proofing designs equipment to contain ignition hazards, prevent entry of hazardous substances, and, contain any fire or explosion that could occur. Intrinsic safety designs equipment to operate using minimal energy, insufficient to cause ignition. Zone 0 is an area in which an explosive atmosphere is present continuously for long periods of time or will frequently occur. In Europe and the rest of the world - but also more and more in North America - the Zone system is used. Analysers, motors, control boxes, computers, Any arcs or sparks in this equipment has insufficient energy (heat) to ignite a vapour. Photo 2. For specific industries, the specific codes for that industry are important to use. Zone 1 - Explosive atmospheres are likely to occur. 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). TLS OFFSHORE CONTAINER Carbon monoxide, ether, hydrogen sulfide, . No other aspect of safety receives more attention in the form of codes and standards. The autoignition temperature is the lowest temperature at which the substance will ignite without an additional heat or ignition source (at atmospheric pressure). A: No. Intrinsic safety -- This protection technique is permitted for equipment in the Class I, Zone 0 or Zone 1 locations for which it is approved. In 29 CFR 1910.307(c)(2)(ii), OSHA requires all equipment used in a hazardous location to be marked with the class, group and operating temperature or temperature range for which it is approved. Hazardous area classification. Division defines the probability of the hazardous material being present in an ignitable concentration in the surrounding atmosphere. June 2019 Flameproof "d" - This protection technique is permitted for equipment in the Class I, Zone 1 locations for which it is approved. National Electric Code 2020 edition National Fire Protection Association. 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. Please read AddThis Privacy for more information. 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. It may exist because of repair, maintenance operations, or leakage. Sources of such hazards include gases, vapors, dust, fibers, and flyings, which are combustible or flammable. 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. Informational Note No. ignitable concentrations of dust, fibers, or flyings are present for long periods of time, ignitable concentrations of dust, fibers, or flyings are likely to exist under normal conditions, ignitable concentrations of dust, fibers, or flyings unlikely to exist under normal conditions, Metal dusts, such as magnesium (Division 1 only), Carbonaceous dusts, such as carbon & charcoal, Non-conductive dusts, such as flour, grain, wood & plastic, Ignitible fibers/flyings, such as cotton lint, flax & rayon, Ignitible fibers or flyings, such as cotton lint, flax & rayon. In recent years also the EPL is specified for several kinds of protection. No representation is made that the information or references are complete or remain current. Division 2 is equivalent to Zone 2, while Division 1 is either Zone 0 or 1. August 2018 A spark or high heat must also be present. Category 2 equipment may be used in zone 1 or zone 2 areas. Safety is ensured in the event of frequently occurring disturbances or equipment faults which normally have to be taken into account. Temporary Refuge Class I: hazardous because flammable gases or vapors are present in the air in quantities sufficient to produce explosive or ignitable mixtures: . A material may have a relatively low autoignition temperature yet if its flash-point is above the ambient temperature, then the area may not need to be classified. Sources This is exactly defined as the limiting concentration of oxygen below which combustion is not possible, independent of the concentration of fuel. That is why the use of mobile phones on petrol forecourts are banned. November 2021 Is intended for us in Zone 2 (gases) or Zone 22 (dusts). These areas only become hazardous in case of an accident or some unusual operating condition. Determined to be none of the above. 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. to EN 1127-1): After the hazard area classification is completed, then the ignition assessment starts. Container Standards API 500/505 mostly for onshore and offshore oil and gas applications. according to ISO standard 80079 series. Within a working area or installation an ignition can be created by many factors. 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". 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. 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. coal and charcoal), Group G Nonconductive dusts (eg. Horizontal. *unless risk assessment states a higher or lower category is required. We don't save this data. January 2023 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. 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. September 2019 Identifying Zone 0, Zone 1, and Zone 2 Hazardous Areas. NEC 2 Divisions (Div 1 2) Division I Comprising of Area Same as Zone 0 1. Comparison of Zones and Divisions. Coal mines, grain mills, elevators, and similar facilities likewise present the risk of a clouds of dust. The Zone system of hazardous area classification, defines the probability of the hazardous material, gas, or dust, being present in sufficient quantities that can generate explosive or ignitable mixtures. Different countries have approached the standardization and testing of equipment for hazardous areas in different ways. FREEZER ethanol, methane or hydrogen. 2: Where gas detection, Informational Note No. Substances characterization Consequences . Not only are hazardous areas classified by Class (nature of the hazardous material,) and Division . These areas are classified solely for the purpose of ensuring the safe and proper specification and installation of electrical/electronic equipment. Informational Note No. Zone Hazardous Location 2 Table of . 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 simplest is to minimize the amount of electrical equipment installed in a hazardous location, either by keeping the equipment out of the area altogether, or by making the area less hazardous (for example, by process changes, or ventilation with clean air). Container Test >> For Gas Vapor this would be Zone 1. Then, the level of risk of an explosion is based on the frequency and duration of the occurrence of an explosive atmosphere. Temperature Control Various regulations use terms such as class, division, zone, and group to differentiate the various hazards. 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. |MWD/LWD Cabin 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). Readers with specific questions should refer to the applicable standards or consult with an attorney. All emergency versions, whether Zone 1 or Zone 2 can also be easily visually identified by their red end cap, encapsulating the emergency battery back-up. 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. 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.
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