| For Gas/Vapor this would be Zone 0. 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 . In other cases, the atmosphere is normally non-hazardous, but a dangerous concentration can be reasonably foreseensuch as operator error or equipment failure. Several protection strategies exist. TLS OFFSHORE CONTAINER November 2020 Equipment marked as suitable for Group IIC is also suitable for IIB and IIA. This classification method provides a description of the hazardous material that may be present, and the probability that it is present, so that the appropriate equipment may be selected, and safe installation practices followed. Subscribe 6.9K views 2 years ago Oil and Gas Zone Classifications: A) Hazardous Area Classification It's cable reimagined No DVR space limits. The relation between that system and de zone classification system is clarified within the following table (only for gases and liquids are displayed, not for dusts and fibers). Hazards in this group gas can be ignited very easily indeed. 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". 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. Type of protection "n" -- This protection technique is permitted for equipment in the Class I, Zone 2 locations for which it is approved. This is exactly defined as the limiting concentration of oxygen below which combustion is not possible, independent of the concentration of fuel. These would be then labeled with each of the individual methods. 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. 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. 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. In Northerm America, instead of the zone classification system, the Class/Division system is used. Class defines the type of explosive or ignitable substances which are present in the atmosphere. 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. Electrical equipment installation in atmosphere with flammable gases or vapors, flammable liquids, combustible dusts, ignitable fibers or flyings represents a risk for fire and explosion. Zone 1 - A place in which an explosive atmosphere is likely to occur in normal operation occasionally 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. Explosion Hazardous Areas are divided into zones according to risk probabilities. Then, the level of risk of an explosion is based on the frequency and duration of the occurrence of an explosive atmosphere. It is essential to know which zone you are working in, so that you can specify the most appropriate equipment. SEWAGE TREATMENT March 2022 For liquids, gases and vapours: Zone 0, Zone 1 and Zone 2. Determining the Class, Division and Group or Zone and Group is critical to correctly applying the requirements for a given hazardous location. NFPA 70 NEC establishes area classifications based on Classes, Divisions and Groups that when combined delineate the hazardous conditions of a specific area. Comparison of Zone 2 and Division 2 TABLE 1 - AREA CLASSIFICATIONS Division 1: Where ignitable concentrations can exist all of the time or some . Please read Google Privacy & Terms for more information about how you can control adserving and the information collected. These areas only become hazardous in case of an accident or some unusual operating condition. Drop Test Class I: hazardous because flammable gases or vapors are present in the air in quantities sufficient to produce explosive or ignitable mixtures: . The surface of a high pressure steam pipe may be above the autoignition temperature of some fuel-air mixtures. The last requirement for the explosion is the presence of an ignition source, like a spark or hot surface. October 2022 The following content is only related to flammable substances and not to pyrotechnic substances or other instable substances, among those who can decompose. Those guidelines address electric wiring, equipment, and systems installed in hazardous (classified) locations and contain specific provisions for the following: wiring methods, wiring connections; conductor insulation, flexible cords, sealing and drainage, transformers, capacitors, switches, circuit breakers, fuses, motor controllers, receptacles, attachment plugs, meters, relays, instruments, resistors, generators, motors, lighting fixtures, storage battery charging equipment, electric cranes, electric hoists and similar equipment, utilization equipment, signaling systems, alarm systems, remote control systems, local loud speaker and communication systems, ventilation piping, live parts, lightning surge protection, and grounding. Specific types of protection being used will also be marked. Shown below is a summary of the applicable NEC Articles to reference to ensure the proper requirements are applied. HAZARDOUS VS. This article covers the requirements for the, Informational Note No. Directly adjacent on the label one will find the mark of the listing agency. 29 CFR 1910.399 Definitions Applicable to Subpart S
Terminology for both hazards and protective measures can vary. ethanol, methane or hydrogen. May 2019 the inside of tank truck or the interior of a dust filter). Zone 0, 1, and 2 locations shall include those specified in 505.5 (B) (1), (B) (2), and (B) (3). Entire Vapour space of storage tank. NEC has created an Americanized version of the IEC/CENELEC Zone system in a stand-alone article (Article 505). Informational Note No. Zone 1 is an area that is classified 'as a place in which an explosive atmosphere consisting of a mixture with air or flammable substances in the form of gas, vapours and mists is likely to occur occasionally during normal operation', whereas Zone 2 is an area that is classified 'as a place in which an explosive atmosphere consisting of a mixture 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. . Although OSHA does not provide a definition of group classifications in 29 CFR 1910.307 or 399 they do provide a note under 29 CFR 1910.307(c)(1) that states: NFPA 70, the National Electrical Code, lists or defines hazardous gases, vapors, and dusts by Groups characterized by their ignitable or combustible properties. To meet OSHAs marking requirement, the marking must include the hazardous group the equipment is approved to operate in. The Zone system has wider use in the chemical and petrochemical industries. Increased safety "e" -- This protection technique is permitted for equipment in the Class I, Zone 1 locations for which it is approved. BATTERY ENERGY STORAGE SYSTEMBESS) Electrical equipment installed in such locations can provide an ignition source, due to electrical arcing, or high temperatures. 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,. It uses the familiar Class/Division system and adapts the IEC/CENELEC Zones into it while maintaining NEC wiring methods and . 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. This is an important factor in the classification of hazardous areas. Zone 0 (hazardous area) An area in which an explosive gas-air mixture is continuously present or present for long periods. These hazardous (classified) locations are assigned the following designations: For definitions of these locations, see 1910.399. Adapters shall be used for connection to conduit or NPT-threaded fittings. Zone 1 is an area in which an explosive atmosphere is likely to occur occasionally in normal operation. IEC 60079-10.1 Classification of areas - Explosive gas atmospheres. 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. Explosion-proofing designs equipment to contain ignition hazards, prevent entry of hazardous substances, and, contain any fire or explosion that could occur. Only emails and answers are saved in our archive. 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. 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. Article 505 National Electrical Code (NEC), Article 506 National Electrical Code (NEC). That flammable gas or vapor . Ex s is a coding referenced in IEC 60079-0. SPARTANs Zone 1 part code begins SPX, Zone 2 SPZ and industrial products having a SPI prefix. May 2021 Such properties include flame temperature, minimum ignition energy, upper and lower explosive limits, and molecular weight. THE PRODUCTS YOU NEED, A high level of protection is ensured. NFPA 70 NEC Zone Classification System The Zone Classification System is offered as an alternative to the Class and Division system. Explosions can cause significant damage along with severe injury or worse loss of life. And safety must be guaranteed in the case of two faults occurring independently of each other. Zone 2 - Explosive atmospheres are unlikely to occur or present only infrequently and for a short period only.
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