GB/T 25285.2-2021 English PDFUS$459.00 · In stock
Delivery: <= 5 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 25285.2-2021: Explosive atmospheres - Explosion prevention and protection - Part 2: Basic concepts and methodology for mining Status: Valid GB/T 25285.2: Historical versions
Basic dataStandard ID: GB/T 25285.2-2021 (GB/T25285.2-2021)Description (Translated English): Explosive atmospheres - Explosion prevention and protection - Part 2: Basic concepts and methodology for mining Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: K35 Word Count Estimation: 25,258 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 25285.2-2021: Explosive atmospheres - Explosion prevention and protection - Part 2: Basic concepts and methodology for mining---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order. Explosive atmospheres - Explosion prevention and protection - Part 2.Basic concepts and methodology for mining ICS 29.260.20 CCSK35 National Standards of People's Republic of China Replace GB 25285.2-2010 Explosive environment explosion prevention and protection Part 2.Mine explosion prevention and protection Basic principles and methods Released on 2021-10-11 2022-05-01 implementation State Administration for Market Regulation Issued by the National Standardization Management Committee Table of contentsForeword Ⅲ Introduction Ⅳ 1 Scope 1 2 Normative references 2 3 Terms and definitions 2 4 Risk assessment 5 4.1 General 5 4.2 Explosion hazard identification 6 4.3 Ignition hazard identification 6 4.4 Estimate the possible effects of the explosion 6 5 May ignite the source 6 5.1 Hot surface 6 5.2 Flames and hot gases (including hot particles) 6 5.3 Mechanical impact, friction and grinding 6 5.4 Electrical equipment and components 6 5.5 Stray current 6 5.6 Static electricity 7 5.7 Thunder 7 5.8 104Hz~3×1011Hz radio frequency (RF) electromagnetic wave 7 5.9 3×1011Hz~3×1015Hz electromagnetic wave 7 5.10 Ionizing radiation 7 5.11 Ultrasound 7 5.12 Adiabatic compression and shock waves 7 5.13 Exothermic reaction (including spontaneous combustion of dust) 7 6 Risk reduction 7 6.1 Basic principles 7 6.2 Avoid explosive atmospheres or reduce the amount of dangerous explosive atmospheres 8 6.3 Classification of hazardous environmental conditions 9 6.4 Design and manufacturing requirements for equipment, protection systems and components to avoid effective ignition sources 10 6.5 Design and manufacturing requirements for equipment, protection systems and components to reduce explosion effects 14 6.6 Provisions on emergency measures 15 6.7 Principles of measurement and control systems for explosion prevention and protection 15 7 Use information 15 7.1 General 15 7.2 Information on prevention of explosion during trial operation, maintenance and repair 16 7.3 Qualifications and training 16 Appendix A (informative) The relationship between equipment protection level (EPL) and hazardous environmental conditions 17 Appendix B (Normative) Tools for potentially explosive atmospheres 18 Reference 19ForewordThis document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules of Standardization Documents" Drafting. This document is the second part of GB/T 25285 "Explosion Prevention and Protection in Explosive Atmospheres". GB/T 25285 has been released to Lower part. ---Part 1.Basic principles and methods; ---Part 2.Basic principles and methods of mine explosion prevention and protection. This document replaces GB 25285.2-2010 "Explosion Prevention and Protection in Explosive Atmospheres Part 2.Mine Explosion Prevention and Protection Compared with GB 25285.2-2010, the main technical changes are as follows. --- Modify the risk assessment (see Chapter 4, Chapter 4 and Chapter 5 of the.2010 edition); ---Modified the requirements for electrical equipment (see 6.4.5, 6.4.5 in the.2010 edition); ---Modified the requirements for ultrasonic equipment (see 6.4.12, 6.4.12 in.2010 edition); --- The specific content of explosion-resistant design, explosion venting, explosion suppression, and explosion prevention measures have been deleted (see the.2010 edition of 6.5.2~6.5.5). Please note that some of the contents of this document may involve patents. The issuing agency of this document is not responsible for identifying patents. This document was proposed by the China Electrical Equipment Industry Association. This document is under the jurisdiction of the National Standardization Technical Committee for Explosion-proof Electrical Equipment (SAC/TC9). Drafting organizations of this document. Nanyang Explosion-proof Electrical Research Institute Co., Ltd., Anbiao National Mining Product Safety Marking Center Co., Ltd., Shenhua Baorixile Energy Co., Ltd., Shanghai Inspection and Testing Institute for Instruments and Automation Systems Co., Ltd., China Coal Science and Industry Group Changzhou Research Institute Co., Ltd. Company, Coal Science Group Shenyang Research Institute Co., Ltd., Henan Academy of Coal Science Testing Technology Co., Ltd., Shanghai Coal Science Testing Technology Co., Ltd. The main drafters of this document. Zhang Gang, Hu Jihong, Meng Feng, Wang Jun, Xu Jianping, Zhong Liyun, Li Bing, Deng Bo, Li Bin, Li Lei. The previous versions of the documents replaced by this document are as follows. ---GB 25285.2-2010.IntroductionThe purpose of GB/T 25285 "Explosion Prevention and Protection in Explosive Atmospheres" is to establish basic principles and methods for explosion prevention and protection. Due to the difference in explosive environmental conditions between mines and factories, there are also different requirements for explosion prevention and protection measures and methods, so GB/T 25285 consists of two parts. ---Part 1.Basic principles and methods. Established general principles and general principles of explosion prevention and protection in industries other than the mining industry method. ---Part 2.Basic principles and methods of mine explosion prevention and protection. Established the principles of explosion prevention and protection in the mining industry Principles and methods. GB 25285 has been issued and implemented for more than ten years. During this period, explosion risk identification and assessment, explosion prevention and protection technologies/equipment/systems have been developed. Certain development, so the technical content of this document needs to be revised to adapt to the above development. This revision also carried out the file structure Some adjustments and improvements. This document also contains considerations for the following aspects. In view of the special consideration of the explosive environment of the mine, the explosion may originate from. ---Materials for processing or application of equipment, protection systems and components, such as minerals obtained during mining; ---Materials released by equipment, protection systems and components; ---Materials adjacent to equipment, protection systems and components; ---Materials for manufacturing equipment, protection systems and components. The explosion protection of equipment, protection systems and components depends on. ---Design and manufacture of equipment, protection systems and components; ---Specified use; ---Foreseeable misuse; ---Environmental conditions; ---Mined and exposed materials. This document also involves some safety factors, that is, manufacturers should consider their safety during the design and manufacture of equipment, protection systems and components Purpose and how to use it. Only by adopting this method can the inherent hazards of equipment, protection systems and components be reduced. Note 1.When users of equipment, protection systems and components assess the explosion risk in the workplace and select appropriate equipment, protection systems and components, this document also Can be used as a guide. Whether a mine is a gas mine or a non-gas mine depends on the minerals or materials being mined and whether gas appears in the mining. Usually, so All coal mines are regarded as gas mines. However, gas may also occur in non-coal wells, such as mining minerals in adjacent oil-bearing layers, or the mining process The destruction of unmined coal seams, or the ejection of combustible gas from the mine. In mines where combustible minerals are mined, small particles of mined minerals may be blown into the air to form dust that can burn quickly Air mixture may also have a risk of explosion. Combustible dust itself may be an explosion risk (when an explosive dust-air mixture is formed Time), or may be deposited in layers on the ground and sidewalls of underground tunnels, they will be washed up by gas explosions. In the latter case, due to flammable Sexual dust was raised by the explosion wave, the explosion intensity increased several times, and at the same time, the flame spread along the roadway was accelerated. The emergence and consequences of this explosive environmental risk are different for different mines, which depends on the type of mine, the layout of the roadway, and the development of minerals. The emergence of mining, gas and/or combustible dust. In coal mines, due to mining activities, gas and coal dust coexisting with coal will be released. Due to the precautions taken, it is impossible to completely Excluding the formation of explosive gas-air mixture and explosive dust-air mixture, therefore, the potential explosion risk is greater. The gas-air mixture is usually diluted by ventilation or discharged to the ground through the mine tunnel. Therefore, in normal work, the content of combustible gas The amount remains well below the lower explosive limit. However, due to system failure (such as fan failure), a large amount of combustible gas gushes out suddenly (combustible gas Outstanding) or due to the decrease in ventilation pressure, or increase in coal production caused by the increase in the release of combustible gas, may exceed the allowable combustible gas concentration. The explosive environment caused by this method, by limiting the space and/or time, may not only cause danger at the point of the incident, but also may escape. Roads, return air ducts and other mining buildings connected to them in the mining design cause hazards. The coal dust air mixture is generally suppressed by spraying water to the dust source, the dust removal system on the roadheader, and/or using inert dust. To reduce the potential for explosiveness. However, if explosive dust may be carried by the air, such as coal transfer points, coal bunkers and other transportation systems Therefore, the danger of explosion still exists. Unlike surface industries, in gas mines, electrical and non-electrical equipment, mining personnel have been Under unfavorable conditions, these mixtures may form an explosive environment. Therefore, to prevent explosions and evacuation when danger occurs, special Strict safety requirements. Due to the potentially devastating effects of underground gas/dust explosions, underground mining is only allowed outside the explosion range conduct. In a gas mine, in a specific work area, the decision to determine whether a mining worker can perform operations depends on the environment that often occurs during a specific time condition. Traditionally, the safety factor is adopted. The common practice is that if the environmental conditions meet the For the concentration specified by the lower explosive limit (LEL), the equipment must be powered off or handled safely, and the miners must be evacuated from the work area. National "Coal Mine Safety Regulations" There are comprehensive and strict regulations. For example, Article 172 of the "Coal Mine Safety Regulations" (2016) stipulates. When the gas concentration in the lane wind exceeds 1.0% or the carbon dioxide concentration exceeds 1.5%, work must be stopped, personnel must be evacuated, measures must be taken, and treatment must be taken. reason. "Regarding the location of methane sensor (portable meter), alarm concentration, power-off concentration, re-power concentration and power-off range, "Coal Mine Safety Regulations" (2016) Article 498 in Table 18 has strict regulations. Two dangerous conditions are proposed in this document. ----2 hazardous conditions (potentially explosive environment). the methane concentration in the air is within the range of 0% to lower than the LEL (lower explosive limit), or Above UEL (Upper Explosion Limit) ~ 100%. ----1 hazardous condition (explosive environment). the concentration of methane in the air is within the range of LEL~UEL. In mine shafts with hazardous conditions of level 1, only Ma-level equipment is allowed. Ma-level equipment has a high protection level, and Ma-level equipment Equipment (such as telephones, flammable gas measuring equipment) can continue to operate in explosive environments, because they even under rare equipment failure conditions It is also safe, because Ma-class equipment has two independent protection measures or double fail-safe system to ensure. In mine shafts with level 2 hazardous conditions, both Ma and Mb level equipment can be used. Mb class equipment has a high protection level, Suitable for mining working conditions. In an explosive environment, Mb-class equipment needs to be powered off or handled safely. Note 2.There are relevant regulations in the "Coal Mine Safety Regulations" for equipment power-off, power-up or safety treatment and its gas concentration limit. Note 3.Under special conditions, in an explosive environment, it may be necessary to operate Mb-class equipment within a short period of time. When evacuating from the working area with high concentration, when the miner wears ambulance for recovery work or activates the gas drainage system. Ma-class and Mb-class equipment can only work under the functional characteristics specified by the manufacturer. Only in this way can the equipment guarantee the corresponding protection grade. "Coal Mine Safety Regulations" is a law that must be followed in coal mine safety production. The location where the mine gas is measured in the "Coal Mine Safety Regulations", The time, method, and disposal of the measurement results are clearly stipulated. If the gas reaches the specified limit, the equipment will be manually or automatically cut off. power supply. Unlike GB/T 25285.1-2021, the dangers caused by explosive gas environments and explosive dust environments are subdivided into this This method is not recommended for underground coal mines, because the danger of mine shafts may be caused by gas and combustible dust clouds at the same time. because Therefore, explosion-proof measures always cover the danger caused by gas and the danger caused by combustible dust. A large number of studies have shown that the minimum ignition energy (MIE) of coal dust/air mixture is hundreds of The maximum test safety gap (MESG) of coal dust particles is twice as large as the maximum test safety gap of gas. Therefore, design and manufacture for gas Equipment, protection systems and components for air mixtures are also suitable for coal dust air mixtures. The comparison of gas and coal dust test data is only relative to the atmosphere (gas and/or a mixture of dust and air), and has nothing to do with the dust layer. when When considering coal dust accumulation, in this case, the maximum surface temperature of the equipment on which coal dust is deposited is limited to 150°C for Type I equipment, which is lower Due to the minimum ignition temperature of gas, additional precautions are required for this. Also pay attention to, there may be some areas in coal mines and non-coal mines where there is no gas, but there is an explosion risk caused by combustible dust. Explosive environment explosion prevention and protection Part 2.Mine explosion prevention and protection Basic principles and methods1 ScopeThis document outlines the basic principles and methods for the design and manufacture of mine equipment, protection systems and components, and stipulates the explosion in the mining industry. Methods of explosion prevention and protection. This document is applicable to Class I equipment that is intended to be used in the underground part of the mine and the part of the ground installation where there is a risk of gas and/or combustible dust. Protection systems and components. Note. The detailed information on specific equipment, protection systems and components is specified by the corresponding professional standards. The design and implementation of explosion-proof measures require flammable substances (Material) and relevant safety data for explosive environments. This document specifies methods for identifying and assessing hazardous situations that may lead to explosions, as well as design and structure that are compatible with safety requirements. Structural measures are achieved through the following aspects. ---Risk assessment; --- Risk reduction. The safety of equipment, protection systems and components can be achieved by eliminating hazards and/or limiting risks, that is, by adopting the following methods. a) Appropriate design (no safety protection device); b) Safety protection device; c) Use information; d) Any other preventive measures. The explosion-proof measures corresponding to a) (prevention) and the explosion-proof measures corresponding to b) (protection) are covered in Chapter 6 of this document. Explosive measures are covered in Chapter 7 of this document. The explosion-proof measures corresponding to d) are not covered in this document. They are in GB/T 15706 (in GB/T 15706-2012 is referred to in Chapter 6). The preventive and protective measures specified in this document do not provide the required level of protection unless the equipment, protective systems and components are used in their intended use. Operate within the scope of use, and install and maintain in accordance with the corresponding operating procedures or requirements. This document applies to any equipment, protective systems and components intended to be used in potentially explosive environments. These environments may be Caused by flammable substances handled, used or released by the system and components, or by flammable substances and/or equipment around the equipment, protective systems, and components. The materials of the equipment, protection systems and components. Since blasting can release a potentially explosive environment, this document also applies to blasting equipment, except for explosives and detonators. This document applies to equipment, protection systems and components at all stages of use. This document does not apply to. ---Medical equipment prescribed for use in a medical environment; --- Equipment, protective systems and components used in explosion hazard locations caused by the presence of explosive substances or unstable chemical substances; ---Personal protective equipment; --- Contains the design and manufacture of systems that require control of the combustion process, unless they can be equivalent to an ignition source in a potentially explosive environment; --- Mines and ground installations where gas and/or combustible dust are not inevitable (such as coal preparation plants, power plants, coke oven workshops in coal mines) Wait). Explosive environments may appear in these places, but they are not part of coal mines, they are in GB/T 25285.1-2021 Involved. ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 25285.2-2021_English be delivered?Answer: Upon your order, we will start to translate GB/T 25285.2-2021_English as soon as possible, and keep you informed of the progress. The lead time is typically 3 ~ 5 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of GB/T 25285.2-2021_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 25285.2-2021_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. 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