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GB 50058-2014   Code for Design of Electrical Installations in Explosive Atmospheres (English Version)
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Implemented on:2014-10-1 Delivery: via email in 1 business day
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Standard No.: GB 50058-2014
English Name: Code for Design of Electrical Installations in Explosive Atmospheres
Chinese Name: 爆炸危险环境电力装置设计规范
Professional Classification: GB    National Standard
Issued by: Ministry of Housing and Urban-Rural Construction of the People’s Republic of China
Issued on: 2014-01-29
Implemented on: 2014-10-1
Status: valid
Superseding:GB 50058-1992 Electrical installations design code for explosive atmospheres and fire hazard
Language: English
File Format: PDF
Word Count: 20000 words
Price(USD): 140.0
Delivery: via email in 1 business day
1 General Provisions 1.0.1 This code is formulated with view to standardizing the design of electrical installations in explosive atmospheres, implementing the guideline of "prevention first" when designing, ensuring human and property safety, and taking precaution measures according to specific conditions. 1.0.2 This code is applicable to the classification of hazardous areas and design of electrical installations for new construction, extension and renovation, for which explosive atmospheres may occur in the process of producing, processing, handling, transporting and storing. This code is not applicable to the following atmospheres: 1 In the pit; 2 During manufacturing, using or storing gunpowder, explosive and initiating explosive, fuze and initiating explosive devices, etc.; 3 At places with electrical installations for electrolysis and electroplating which make use of electric energy in production and directly associate with the production process; 4 With materials which may fire voluntarily by using strong oxidizer while without an external ignition source; 5 With vehicles for water, land and air transportation and with offshore and on-land oil well platforms; 6 With piping systems for heating, air conditioning, cooking, washing and the similar while adopting flavored gas as the fuel; 7 In the treatment room; 8 With catastrophic failure. 1.0.3 The code considers nothing about influence on classification of hazardous area and on design of relevant electrical installations casused by indirect harms. 1.0.4 Classification of hazardous areas shall be jointly completed by professional staff in charge of processing medium properties, equipment and processing properties in production process and engineering technicians in safety and electrical disciplines through consultation. 1.0.5 In addition to the requirements stipulated in this code, those stipulated in the current relevant standards in China shall be complied with for the design of electrical installations in explosive atmospheres. 2 Terminologies 2.0.1 Flash point The lowest liquid temperature, at which with enough vapors released from liquid to form flammable gas or air mixture standard conditions. 2.0.2 Ignition temperature The minimum temperature, at which ignition occurs at the hot surface of mixture formed by flammable gas or vapor together with air, under specified conditions. 2.0.3 Ambient temperature The average maximum temperature of the hottest months in past years at the designated area. 2.0.4 Flammable material Refer to substance that is flammable and is able to generate flammable gas, vapor or mist. 2.0.5 Flammable gas or vapor The gas or vapor that is able to form an explosive gas atmosphere when being mixed with air in a certain proportion. 2.0.6 Flammable liquid The liquid that is able to generate flammable vapor under foreseeable application conditions. 2.0.7 Flammable mist The droplet of flammable liquid that is able to form an explosive atmosphere when volatilizing. 2.0.8 Explosive gas mixture Mixture of gas, vapor, or mistlike flammable material mixed with air in atmospheric conditions, of which the combustion after ignition may spread within the full range. 2.0.9 Highly volatile liquid Highly volatile liquid refers to the one with absolute vapor pressure exceeding 276 kPa at 37.8 ℃, including butane, ethane, ethylene, propane and propylene, etc. as well as liquefied natural gas, natural gas liquids and their mixtures. 2.0.10 Explosive gas atmosphere An atmosphere that may keep combustion spreading freely under atmospheric conditions after the mixture of flammable gas or vapor subtance and air is ignited. 2.0.11 Explosive limit 1 Lower explosion limit (LEL) The minimum concentration of flammable gas, vapor or mist to form explosive gas mixture in the air. When the concentration of flammable gas or vapor in the air is lower than that, the gas atmosphere will not generate explosion. 2 Upper explosion limit (UEL) The maximum concentration of flammable gas, vapor or mist in the air to form explosive gas mixture. When the concentration of flammable gas or vapor in the air exceeds that, the gas atmosphere will not generate explosion. 2.0.12 Hazardous area The area where preventive measures required shall be taken for the structure, installation and application of electrical equipment due to the quantity of explosive mixture that may appear or expect to appear is sufficient. 2.0.13 Non-hazardous area The area where preventive measures required shall not be taken for the structure, installation and application of electrical equipment due to the quantity of explosive mixture that may appear or expect to appear is insufficient. 2.0.14 Zone The full or a part of hazardous area. According to the occurence frequency and duration of explosive mixture, the area may be classified into several zones with different hazard level. 2.0.15 Source of release The position or place where may release substances to form explosive mixture. 2.0.16 Natural ventilation atmosphere The zone where fresh air may replace original mixture due to the influence of natural wind or temperature difference. 2.0.17 Artificial ventilation atmosphere The zone where the orginal mixture is replaced by fresh air by virtue of device application, such as a fan or exhauster. 2.0.18 Normal operation The operation condition of equipment within the range of its design parameters. 2.0.19 Dust Small solid particles which are precipitable in the air due to their own weights and may also keep suspending in the air for a certain period, including fibre and flyings as well as dust and fine particles specified in the current national standard "Specifications for Bag House" (GB/T 6719). 2.0.20 Combustible dust Dust, fibre or flyings that may generate combustion or flameless combustion in the air and may form explosive mixture at the barometric pressure and normal temperature. 2.0.21 Conductive flyings Solid particles with the nominal size larger than 500 μm, which may suspend in the air and may also be precipitable due to their own weights, including firbre. 2.0.22 Conductive dust The dust with resistivity equals to or less than 1×103Ω•m. 2.0.23 Non-conductive dust The dust with resistivity larger than 1×103Ω•m. 2.0.24 Explosive dust atmosphere An atmosphere that may keep combustion spreading freely under atmospheric conditions after the mixture of combustible dust and air is ignited. 2.0.25 Heavier-than-air gases or vapors Gases or vapors with the relative density larger than 1.2. 2.0.26 Lighter-than-air gases or vapors Gases or vapors with the relative density less than 0.8. 2.0.27 Ignition temperature of dust layer The minimum temperature of the hot surface on which ignition of dust layer with specified thickness occurs. 2.0.28 Ignition temperature of dust cloud The minimum temperature of inner wall of furnace, in which the dust cloud in furnace air ignites. 2.0.29 Explosive atmospheres An atmosphere that may keep combustion spreading freely under atmospheric conditions after the mixture of gas, vapor, dust, mist, fibre or flyings and air is ignited. 2.0.30 Equipment protection level (EPL) The protection level specified for equipment according to the possibility of equipment to be a source of ignition, and different features of explosive gas atmosphere and explosive dust atmosphere. 3 Explosive Gas Atmosphere 3.1 General Requirement 3.1.1 When one of the following explosive gas mixture atmospheres occurs or may occur in the process of manufacturing, processing, handling, transporting or storing, design of electrical installations in explosive gas atmosphere shall be made: 1 Under atmospheric conditions, the explosive gas mixture is formed due to the mixing of flammable gas and air; 2 The explosive gas mixture is formed by vapor or mist of flammable liquid through mixing with air, of which the flash point is less than or equal to the ambient temperature; 3 In the case that the operation temperature of material is higher than the flash point of flammable liquid, and when the flammable liquid has the potential leakage, explosive gas mixture is formed due to mixing of vapor or mist of flammable liquid and air. 3.1.2 In the explosive gas atmosphere, the conditions for explosion shall meet the following conditions: 1 With flammable gas and vapor or mist of flammable liquid, and the concentration is within the explosive limit; 2 With spark, arc or high temperature that is able to ignite the explosive gas mixture. 3.1.3 The following explosion-proof measures shall be taken in explosive gas atmosphere: 1 The occurring possibility of explosion conditions simultaneously shall be minimized. 2 In process design, the following measures to eliminate or reduce the release and accumulation of flammable materials shall be taken: 1) In the process flow, a lower pressure and temperature shall be adopted to limit the flammable materials into a closed container; 2) The process layout shall be able to limit and reduce the range of hazardous area; and hazardous area of different levels or the hazardous area and non-hazardous area shall be separated in a respective plant or within the battery limit; 3) In equipment, nitrogen or other inert gases may be adopted for covering; 4) Measures such as safety interlocking or adding chemical reagents into as polymerization inhibitor for the polymerization reaction in trouble shall be taken. 3 To prevent explosive gas mixture from generating or to shorten the detention time of explosive gas mixture, the following measures may be taken: 1) The process unit should have outdoor and open type arrangement; 2) Set artificial ventilation devices; 3) Set a plenum in explosive atmospheres; 4) Automatic measurer or device shall be arranged at places where explosive gas mixture is prone to form or accumulate, and the instrument shall be able to reliably send signals or cut the power off when the gas or vapor concentration is close to 50% of the explosive limit. 4 In an area, measures to eliminate or control spark, arc or high temperature generated by the line shall be taken.
1 General Provisions 2 Terminologies 3 Explosive Gas Atmosphere 3.1 General Requirement 3.2 Classification of Hazardous Area in Explosive Gas Atmosphere 3.3 Extension of Hazardous Area in Explosive Gas Atmosphere 3.4 Grading and Grouping of Explosive Gas Mixture 4 Explosive Dust Atmosphere 4.1 General Requirement 4.2 Classification of Hazardous Area in Explosive Dust Atmosphere 4.3 Extension of Hazardous Area in Explosive Dust Atmosphere 5 Electrical Installations in Explosive Atmosphere 5.1 General Requirement 5.2 Selection of Electrical Equipment in Explosive Atmosphere 5.3 Erection of Electrical Equipment in Explosive Atmosphere 5.4 Design of Electrical Wiring in Explosive Atmosphere 5.5 Grounding Design in Explosive Atmosphere Appendix A Example Drawing and Condition of Classification of Explosive Hazardous Area Appendix B Typical Example Drawing of Extension of Hazardous Area in Explosive Gas Atmosphere Appendix C Grading and Grouping of Explosive Gas or Vapor Mixture Appendix D Typical Example Drawing of Extension of Hazardous Area in Explosive Gas Atmosphere Appendix E Example of Characteristics of Combustible Dust Explanation of Wording in This Code List of Quoted Standards
Referred in GB 50058-2014:
*GB50065-
*GB 3836.12-2008 Explosive atmospheres - Part 12: Classification of gases or vapours with air according to their maximum experimental safe gaps and minimum igniting current
*GB 3836.1-2010 Explosive atmospheres—Part 1:Equipment—General requirements
*GB 3836.3-2010 Explosive atmospheres - Part 3:Equipment protection by increased safety e
*GB/T 6719-2009 Specifications for bag house
GB 50058-2014 is referred in:
* GB 6222-2005 Safety Code for Gas of Industrial Enterprises
* GB 6514-2008 Safety code for painting - Safety、ventilation and air clean-up for painting process
* GB 6067.1-2010 Safety rules for lifting appliances—Part 1:General
* GB 14444-2006 Safety code for painting - Safety rules for spraying booth
* GB 50156-2012 Code for design and construction of filling station
* SY 0031-2004 Safety Regulations for Heaters Used in Petroleum Industry
* SY/T 0090-2006 Code of Instrument Control System Design for Oil-gas Fields and Pipelines
* Q/SY 29.1~29.3-2007 Specification for regional cathodic protection
* Q/SY 29.1-2007 Specification for regional cathodic protection – Part 1: Regional cathodic protection design
* GB 50053-2013 Code for Design of 20kV & Under Electric Substation
* GB 50073-2013 Code for design of clean room
* GB 50074-2014 Code for design of oil depot
* GB 50194-2014 Safety code of power supply and consumption for installation construction engineering
* GB 50115-2009 Code for design of industrial television system
* EJ/T 795-1993 Regulations for Low and Intermediate-level Radioactive Waste Volume Reduction System
* GB/T 3811-2008 Design rules for cranes
* GB 50016-2014 Code of Design on Building Fire Protection and Prevention
* GB 50195-2013 Design code for producer gas station
* GB 14443-2007 Safety code for painting — Safety rules for paint drying oven
* GB 50030-2013 Oxygen Station Design Specifications
* SH/T 3019-2003 Design code for instrument tubing and wiring in petrochemical industry
* GB 50257-2014
* AQ 5205-2008 Safety code for paint & rendering application
* GB 50049-2011 Code for design of small fossil fired power plant
* GB 50151-2010 Code for design of foam extinguishing systems
* AQ 3013-2008 General norms for safety standardization of hazardous chemical enterprises
* GB 50251-2015 Design code for gas transmission pipeline engineering
* GB 51093-2015 Technical code for hydrochloric acid regeneration engineering according to spraying and roasting technology of iron and steel enterprises
* GB 50737-2011 Code for design of petroleum storage depot
* SH/T 3014-2012 Design specification for pump area of storage and transportation system in petrochemical industry
* GB/T 29781-2013 General requirements for electric vehicle charging station
*GB 14544-2008 Production of vinyl chloride from calcium carbide and acetylene-safety technology code
*GB 15577-2007 Safety regulations for dust explosion prevention and protection
*GB 50516-2010 Technical Code for Hydrogen Fuelling Station
*GB 50059-2011 Code for Design of 35kV~110kV Substation
*GB 16912-2008 Safety Technical Regulation for Oxygen and Relative Gases Produced with Cryogenic Method
*GB/T 34584-2017 Safety technical regulations for hydrogen refueling station
*GB 15577-2018 Safety regulations for dust explosion prevention and protection
*SH/T 3017-2013 Architectural code of petrochemical production design
*GB 50217-2018 Standard for design of cables of electric power engineering
*SH/T 3038-2017 Code for Electric Power Design in Petrochemical Plants
*DB11/755-2010 Safety Code for Construction and Storage of Dangerous Chemicals Warehouse
*GB 50457-2019 Code for design of pharmaceutical industry clean room
*GB/T 19774-2005 Specification of water electrolyte system for producing hydrogen
*GB/T 37562-2019 Technical conditions of pressurized water electrolysis system for hydrogen production
*GB/T 50746-2012 Code for design of petrochemical recirculation cooling water unit
*GB/T 29729-2013 Essential requirements for the safety of hydrogen systems
*GB/T 34542.1-2017 Storage and transportation systems for gaseous hydrogen - Part 1: General requirements
*SH/T 3174-2013 Code for design of on-line analyzer system in petrochemical industry
*GB 51283-2020 Fire protection standard for engineering design of fine chemical enterprise
*GB 50454-2020 Standard for design of aero-engine test cell
*HJ 1093-2020 Technical specifications for industrial organicwaste gas treatment by regenerative thermal oxidation
*GB 50041-2020 Standard for design of boiler plant
*HG 20571-2014 Code for Safety and Hygiene Design of Chemical Enterprise
*GB 51156-2015 Code for design of liquefied natural gas receiving terminal
*GB/T 40061-2021 Technical specification for liquid hydrogen production system
*HG/T 20569-2013 Mechanical Mixing Plant
*JB/T 8856-2018 Dissolved acetylene systems
*AQ 4273-2016 Safety specifications for dedusting system used in dust explosion hazardous area
*GB 51427-2021 Technical standard for auto tracking and targeting jet suppression system
*GB/T 19237-2021 Compressed natural gas dispenser for vehicles
*GB/T 50115-2019 Standard for design of industrrial television system
*GB 50414-2018 Standard for fire protection design of iron and steel metallurgy enterprises
*GB 50229-2019 Standard for design of fire protection for fossil fuel power plants and substations
*SH 3011-2011 Specification for Design of Process Plant Layout in Petrochemical Engineering
*AQ 3036-2010 Setting specifications for safety monitoring and controlling equipments in dangerous chemicals major hazard installations Tanks section
*DL/T 5227-2005 Technical Rule of Thermal Power Automation Design for Auxiliary S
*DL/T 5203-2005 Technical Code for Explosion Prevention Design of Coal and Pulveri
*DL/T 5204-2005 Code for Oil/gas Piping Design of Fossil Fuel Power Plant
*GB 50151-2021 Technical standard for foam extinguishing systems
Code of China
Standard
GB 50058-2014  Code for Design of Electrical Installations in Explosive Atmospheres (English Version)
Standard No.GB 50058-2014
Statusvalid
LanguageEnglish
File FormatPDF
Word Count20000 words
Price(USD)140.0
Implemented on2014-10-1
Deliveryvia email in 1 business day
Detail of GB 50058-2014
Standard No.
GB 50058-2014
English Name
Code for Design of Electrical Installations in Explosive Atmospheres
Chinese Name
爆炸危险环境电力装置设计规范
Chinese Classification
Professional Classification
GB
ICS Classification
Issued by
Ministry of Housing and Urban-Rural Construction of the People’s Republic of China
Issued on
2014-01-29
Implemented on
2014-10-1
Status
valid
Superseded by
Superseded on
Abolished on
Superseding
GB 50058-1992 Electrical installations design code for explosive atmospheres and fire hazard
Language
English
File Format
PDF
Word Count
20000 words
Price(USD)
140.0
Keywords
GB 50058-2014, GB/T 50058-2014, GBT 50058-2014, GB50058-2014, GB 50058, GB50058, GB/T50058-2014, GB/T 50058, GB/T50058, GBT50058-2014, GBT 50058, GBT50058
Introduction of GB 50058-2014
1 General Provisions 1.0.1 This code is formulated with view to standardizing the design of electrical installations in explosive atmospheres, implementing the guideline of "prevention first" when designing, ensuring human and property safety, and taking precaution measures according to specific conditions. 1.0.2 This code is applicable to the classification of hazardous areas and design of electrical installations for new construction, extension and renovation, for which explosive atmospheres may occur in the process of producing, processing, handling, transporting and storing. This code is not applicable to the following atmospheres: 1 In the pit; 2 During manufacturing, using or storing gunpowder, explosive and initiating explosive, fuze and initiating explosive devices, etc.; 3 At places with electrical installations for electrolysis and electroplating which make use of electric energy in production and directly associate with the production process; 4 With materials which may fire voluntarily by using strong oxidizer while without an external ignition source; 5 With vehicles for water, land and air transportation and with offshore and on-land oil well platforms; 6 With piping systems for heating, air conditioning, cooking, washing and the similar while adopting flavored gas as the fuel; 7 In the treatment room; 8 With catastrophic failure. 1.0.3 The code considers nothing about influence on classification of hazardous area and on design of relevant electrical installations casused by indirect harms. 1.0.4 Classification of hazardous areas shall be jointly completed by professional staff in charge of processing medium properties, equipment and processing properties in production process and engineering technicians in safety and electrical disciplines through consultation. 1.0.5 In addition to the requirements stipulated in this code, those stipulated in the current relevant standards in China shall be complied with for the design of electrical installations in explosive atmospheres. 2 Terminologies 2.0.1 Flash point The lowest liquid temperature, at which with enough vapors released from liquid to form flammable gas or air mixture standard conditions. 2.0.2 Ignition temperature The minimum temperature, at which ignition occurs at the hot surface of mixture formed by flammable gas or vapor together with air, under specified conditions. 2.0.3 Ambient temperature The average maximum temperature of the hottest months in past years at the designated area. 2.0.4 Flammable material Refer to substance that is flammable and is able to generate flammable gas, vapor or mist. 2.0.5 Flammable gas or vapor The gas or vapor that is able to form an explosive gas atmosphere when being mixed with air in a certain proportion. 2.0.6 Flammable liquid The liquid that is able to generate flammable vapor under foreseeable application conditions. 2.0.7 Flammable mist The droplet of flammable liquid that is able to form an explosive atmosphere when volatilizing. 2.0.8 Explosive gas mixture Mixture of gas, vapor, or mistlike flammable material mixed with air in atmospheric conditions, of which the combustion after ignition may spread within the full range. 2.0.9 Highly volatile liquid Highly volatile liquid refers to the one with absolute vapor pressure exceeding 276 kPa at 37.8 ℃, including butane, ethane, ethylene, propane and propylene, etc. as well as liquefied natural gas, natural gas liquids and their mixtures. 2.0.10 Explosive gas atmosphere An atmosphere that may keep combustion spreading freely under atmospheric conditions after the mixture of flammable gas or vapor subtance and air is ignited. 2.0.11 Explosive limit 1 Lower explosion limit (LEL) The minimum concentration of flammable gas, vapor or mist to form explosive gas mixture in the air. When the concentration of flammable gas or vapor in the air is lower than that, the gas atmosphere will not generate explosion. 2 Upper explosion limit (UEL) The maximum concentration of flammable gas, vapor or mist in the air to form explosive gas mixture. When the concentration of flammable gas or vapor in the air exceeds that, the gas atmosphere will not generate explosion. 2.0.12 Hazardous area The area where preventive measures required shall be taken for the structure, installation and application of electrical equipment due to the quantity of explosive mixture that may appear or expect to appear is sufficient. 2.0.13 Non-hazardous area The area where preventive measures required shall not be taken for the structure, installation and application of electrical equipment due to the quantity of explosive mixture that may appear or expect to appear is insufficient. 2.0.14 Zone The full or a part of hazardous area. According to the occurence frequency and duration of explosive mixture, the area may be classified into several zones with different hazard level. 2.0.15 Source of release The position or place where may release substances to form explosive mixture. 2.0.16 Natural ventilation atmosphere The zone where fresh air may replace original mixture due to the influence of natural wind or temperature difference. 2.0.17 Artificial ventilation atmosphere The zone where the orginal mixture is replaced by fresh air by virtue of device application, such as a fan or exhauster. 2.0.18 Normal operation The operation condition of equipment within the range of its design parameters. 2.0.19 Dust Small solid particles which are precipitable in the air due to their own weights and may also keep suspending in the air for a certain period, including fibre and flyings as well as dust and fine particles specified in the current national standard "Specifications for Bag House" (GB/T 6719). 2.0.20 Combustible dust Dust, fibre or flyings that may generate combustion or flameless combustion in the air and may form explosive mixture at the barometric pressure and normal temperature. 2.0.21 Conductive flyings Solid particles with the nominal size larger than 500 μm, which may suspend in the air and may also be precipitable due to their own weights, including firbre. 2.0.22 Conductive dust The dust with resistivity equals to or less than 1×103Ω•m. 2.0.23 Non-conductive dust The dust with resistivity larger than 1×103Ω•m. 2.0.24 Explosive dust atmosphere An atmosphere that may keep combustion spreading freely under atmospheric conditions after the mixture of combustible dust and air is ignited. 2.0.25 Heavier-than-air gases or vapors Gases or vapors with the relative density larger than 1.2. 2.0.26 Lighter-than-air gases or vapors Gases or vapors with the relative density less than 0.8. 2.0.27 Ignition temperature of dust layer The minimum temperature of the hot surface on which ignition of dust layer with specified thickness occurs. 2.0.28 Ignition temperature of dust cloud The minimum temperature of inner wall of furnace, in which the dust cloud in furnace air ignites. 2.0.29 Explosive atmospheres An atmosphere that may keep combustion spreading freely under atmospheric conditions after the mixture of gas, vapor, dust, mist, fibre or flyings and air is ignited. 2.0.30 Equipment protection level (EPL) The protection level specified for equipment according to the possibility of equipment to be a source of ignition, and different features of explosive gas atmosphere and explosive dust atmosphere. 3 Explosive Gas Atmosphere 3.1 General Requirement 3.1.1 When one of the following explosive gas mixture atmospheres occurs or may occur in the process of manufacturing, processing, handling, transporting or storing, design of electrical installations in explosive gas atmosphere shall be made: 1 Under atmospheric conditions, the explosive gas mixture is formed due to the mixing of flammable gas and air; 2 The explosive gas mixture is formed by vapor or mist of flammable liquid through mixing with air, of which the flash point is less than or equal to the ambient temperature; 3 In the case that the operation temperature of material is higher than the flash point of flammable liquid, and when the flammable liquid has the potential leakage, explosive gas mixture is formed due to mixing of vapor or mist of flammable liquid and air. 3.1.2 In the explosive gas atmosphere, the conditions for explosion shall meet the following conditions: 1 With flammable gas and vapor or mist of flammable liquid, and the concentration is within the explosive limit; 2 With spark, arc or high temperature that is able to ignite the explosive gas mixture. 3.1.3 The following explosion-proof measures shall be taken in explosive gas atmosphere: 1 The occurring possibility of explosion conditions simultaneously shall be minimized. 2 In process design, the following measures to eliminate or reduce the release and accumulation of flammable materials shall be taken: 1) In the process flow, a lower pressure and temperature shall be adopted to limit the flammable materials into a closed container; 2) The process layout shall be able to limit and reduce the range of hazardous area; and hazardous area of different levels or the hazardous area and non-hazardous area shall be separated in a respective plant or within the battery limit; 3) In equipment, nitrogen or other inert gases may be adopted for covering; 4) Measures such as safety interlocking or adding chemical reagents into as polymerization inhibitor for the polymerization reaction in trouble shall be taken. 3 To prevent explosive gas mixture from generating or to shorten the detention time of explosive gas mixture, the following measures may be taken: 1) The process unit should have outdoor and open type arrangement; 2) Set artificial ventilation devices; 3) Set a plenum in explosive atmospheres; 4) Automatic measurer or device shall be arranged at places where explosive gas mixture is prone to form or accumulate, and the instrument shall be able to reliably send signals or cut the power off when the gas or vapor concentration is close to 50% of the explosive limit. 4 In an area, measures to eliminate or control spark, arc or high temperature generated by the line shall be taken.
Contents of GB 50058-2014
1 General Provisions 2 Terminologies 3 Explosive Gas Atmosphere 3.1 General Requirement 3.2 Classification of Hazardous Area in Explosive Gas Atmosphere 3.3 Extension of Hazardous Area in Explosive Gas Atmosphere 3.4 Grading and Grouping of Explosive Gas Mixture 4 Explosive Dust Atmosphere 4.1 General Requirement 4.2 Classification of Hazardous Area in Explosive Dust Atmosphere 4.3 Extension of Hazardous Area in Explosive Dust Atmosphere 5 Electrical Installations in Explosive Atmosphere 5.1 General Requirement 5.2 Selection of Electrical Equipment in Explosive Atmosphere 5.3 Erection of Electrical Equipment in Explosive Atmosphere 5.4 Design of Electrical Wiring in Explosive Atmosphere 5.5 Grounding Design in Explosive Atmosphere Appendix A Example Drawing and Condition of Classification of Explosive Hazardous Area Appendix B Typical Example Drawing of Extension of Hazardous Area in Explosive Gas Atmosphere Appendix C Grading and Grouping of Explosive Gas or Vapor Mixture Appendix D Typical Example Drawing of Extension of Hazardous Area in Explosive Gas Atmosphere Appendix E Example of Characteristics of Combustible Dust Explanation of Wording in This Code List of Quoted Standards
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Keywords:
GB 50058-2014, GB/T 50058-2014, GBT 50058-2014, GB50058-2014, GB 50058, GB50058, GB/T50058-2014, GB/T 50058, GB/T50058, GBT50058-2014, GBT 50058, GBT50058