GB 37241-2025 Safety specification for inerting of combustible dust English, Anglais, Englisch, Inglés, えいご
This is a draft translation for reference among interesting stakeholders. The finalized translation (passing through draft translation, self-check, revision and verification) will be delivered upon being ordered.
ICS 13.230
CCS H 57
National Standard of the People's Republic of China
GB/T 37241-2025
Replaces GB/T 37241-2018
Safety specification for inerting of combustible dust
可燃性粉尘惰化安全规范
Issue date: 2025-10-31 Implementation date: 2026-11-01
Issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
the Standardization Administration of the People's Republic of China
Contents
Preface
Introduction
1 Scope
2 Normative References
3 Terms and Definitions
4 General Requirements
5 Technical Requirements
5.1 Inerting Medium
5.2 Inerting Medium Supply Equipment
5.3 Inerting Medium Conveyance Equipment
5.4 Protected System
5.5 Monitoring System
6 Installation, Use, and Maintenance
6.1 Installation and Use
6.2 Inerting State
6.3 Maintenance and Protection
6.4 Inerting System Design Document
7 Verification Methods
Appendix A (Normative) Requirements for Atmosphere Inerting Methods
Appendix B (Informative) Limiting Oxygen Concentrations of Some Combustible Dusts and Proportions of Inert Dust Inerting
Appendix C (Informative) Atmosphere Inerting Calculations
Appendix D (Informative) Filling of Open Containers
Appendix E (Informative) Preventing Air from Downward Diffusion into Vent Pipes
Appendix F (Informative) Solid Material Double - Valve Feeding
Appendix G (Informative) Inerting Examples of Process Equipment
References
1 Scope
This document specifies the general requirements, technical requirements, and operation and maintenance requirements for the inerting of combustible dust, and describes the corresponding verification methods.
This document applies to the inerting of process equipment and facilities in dust explosion - hazardous areas.
This document does not apply to coal mines, fireworks, explosives, and strong oxidizing agent dust areas.
2 Normative References
The contents of the following documents constitute essential provisions of this document through normative references in this document. Among them, the dated references apply only the version corresponding to the date; the undated references apply the latest version (including all amendments).
GB/T 150.1 Pressure Vessels — Part 1: General Requirements
GB 2894 Safety Colors and Safety Signs
GB/T 14194 Regulations for Filling Compressed Gases in Gas Cylinders
GB/T 15604 Terminology for Dust Explosion Prevention
GB/T 20801.1 Pressure Piping Code — Industrial Piping — Part 1: General Provisions
GB/T 34526 Regulations for Filling Mixed Gases in Gas Cylinders
3 Terms and Definitions
The terms and definitions defined in GB/T 15604 and the following terms and definitions apply to this document.
3.1
Inerting
A fire - prevention technology that prevents the formation of explosive environments in the protected system or increases the difficulty of igniting the mixture by introducing inert gas into the protected system or adding inert dust.
3.2
Atmosphere Inerting
A fire - prevention technology that prevents the formation of explosive environments in the protected system or increases the difficulty of igniting the mixture by introducing inert gas into the protected system.
3.3
Pressure - Swing Inerting
An atmosphere inerting method that reduces the oxygen concentration in the system by first pressurizing and introducing inert gas into the closed system and then venting it to restore the system pressure to atmospheric pressure.
3.4
Vacuum Inerting
An atmosphere inerting method that reduces the oxygen concentration in the system by first evacuating the sealed system and then introducing inert gas to atmospheric pressure.
3.5
Sweep Through Inerting
Flow Through Inerting
An atmosphere inerting method that reduces the oxygen concentration in the system by continuously introducing inert gas into the system with exhaust ports.
3.6
Displacement Inerting
An atmosphere inerting method that reduces the oxygen concentration in the system by introducing inert gas with a significant density difference from the gas in the system, without significant gas mixing during the process.
3.7
Inert Dust Inerting
A fire - prevention technology that prevents the formation of explosive environments in the protected system or increases the difficulty of igniting the mixture by adding inert dust to the protected system.
3.8
Absolute Inerting
An inerting technology where the proportion of inert gas or added inert dust in the protected system is high enough that changes in the ratio of combustible material to oxygen - containing gas will not form explosive environments.
3.9
Partial Inerting
An inerting technology that prevents the explosive mixture formed by combustible material and air from being ignited by all foreseeable ignition sources by introducing inert gas or adding inert dust into the protected system.
3.10
Inert Gas
A gas that does not react with oxygen, flammable gases, flammable vapors, and flammable dust.
Note: Such as helium, neon, argon, krypton, xenon, and radon, which are elements in Group 18 of the periodic table.
3.11
Flue Gases
A mixture of gases and suspended particles produced by combustion.
Note: When flue gases are used for inerting, their oxygen concentration is limited to a certain range.
3.12
Limiting Oxygen Concentration; LOC
The maximum oxygen volume concentration in a mixture of combustible material, air, or oxygen, and inert gas that cannot form an explosive environment, as measured by a standard method.
Note: The limiting oxygen concentration is related to the characteristics of the combustible material and the type of inert gas.
3.13
Maximum Allowable Oxygen Concentration; MAOC
The maximum value of the oxygen concentration that ensures the safety of the system protected by inerting when certain foreseeable anomalies or misoperations occur.
Note: In actual engineering applications, the maximum allowable oxygen concentration is lower than the limiting oxygen concentration under working conditions.
3.14
Trip Point Oxygen Concentration of System Shutdown; TPSS
The oxygen concentration threshold at which the oxygen concentration monitoring device initiates the shutdown program of the protected system to ensure the safety of the process system and prevent the formation of explosive environments due to air entering.
Note: Shutdown does not mean the complete shutdown of the protected system, but stopping the operation of the protected system in a set safe manner and initiating emergency protection measures.
3.15
Setpoint Oxygen Concentration of Inerting System
The oxygen volume concentration threshold at which the oxygen concentration monitoring device begins to control the flow rate, pressure, or amount of inert gas to maintain the oxygen volume concentration within a safe range.
3.16
Safety Margin
Standard
GB 37241-2025 Safety specification for inerting of combustible dust (English Version)
Standard No.
GB 37241-2025
Status
to be valid
Language
English
File Format
PDF
Word Count
12000 words
Price(USD)
360.0
Implemented on
2026-11-1
Delivery
via email in 1~5 business day
Detail of GB 37241-2025
Standard No.
GB 37241-2025
English Name
Safety specification for inerting of combustible dust
GB 37241-2025 Safety specification for inerting of combustible dust English, Anglais, Englisch, Inglés, えいご
This is a draft translation for reference among interesting stakeholders. The finalized translation (passing through draft translation, self-check, revision and verification) will be delivered upon being ordered.
ICS 13.230
CCS H 57
National Standard of the People's Republic of China
GB/T 37241-2025
Replaces GB/T 37241-2018
Safety specification for inerting of combustible dust
可燃性粉尘惰化安全规范
Issue date: 2025-10-31 Implementation date: 2026-11-01
Issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
the Standardization Administration of the People's Republic of China
Contents
Preface
Introduction
1 Scope
2 Normative References
3 Terms and Definitions
4 General Requirements
5 Technical Requirements
5.1 Inerting Medium
5.2 Inerting Medium Supply Equipment
5.3 Inerting Medium Conveyance Equipment
5.4 Protected System
5.5 Monitoring System
6 Installation, Use, and Maintenance
6.1 Installation and Use
6.2 Inerting State
6.3 Maintenance and Protection
6.4 Inerting System Design Document
7 Verification Methods
Appendix A (Normative) Requirements for Atmosphere Inerting Methods
Appendix B (Informative) Limiting Oxygen Concentrations of Some Combustible Dusts and Proportions of Inert Dust Inerting
Appendix C (Informative) Atmosphere Inerting Calculations
Appendix D (Informative) Filling of Open Containers
Appendix E (Informative) Preventing Air from Downward Diffusion into Vent Pipes
Appendix F (Informative) Solid Material Double - Valve Feeding
Appendix G (Informative) Inerting Examples of Process Equipment
References
1 Scope
This document specifies the general requirements, technical requirements, and operation and maintenance requirements for the inerting of combustible dust, and describes the corresponding verification methods.
This document applies to the inerting of process equipment and facilities in dust explosion - hazardous areas.
This document does not apply to coal mines, fireworks, explosives, and strong oxidizing agent dust areas.
2 Normative References
The contents of the following documents constitute essential provisions of this document through normative references in this document. Among them, the dated references apply only the version corresponding to the date; the undated references apply the latest version (including all amendments).
GB/T 150.1 Pressure Vessels — Part 1: General Requirements
GB 2894 Safety Colors and Safety Signs
GB/T 14194 Regulations for Filling Compressed Gases in Gas Cylinders
GB/T 15604 Terminology for Dust Explosion Prevention
GB/T 20801.1 Pressure Piping Code — Industrial Piping — Part 1: General Provisions
GB/T 34526 Regulations for Filling Mixed Gases in Gas Cylinders
3 Terms and Definitions
The terms and definitions defined in GB/T 15604 and the following terms and definitions apply to this document.
3.1
Inerting
A fire - prevention technology that prevents the formation of explosive environments in the protected system or increases the difficulty of igniting the mixture by introducing inert gas into the protected system or adding inert dust.
3.2
Atmosphere Inerting
A fire - prevention technology that prevents the formation of explosive environments in the protected system or increases the difficulty of igniting the mixture by introducing inert gas into the protected system.
3.3
Pressure - Swing Inerting
An atmosphere inerting method that reduces the oxygen concentration in the system by first pressurizing and introducing inert gas into the closed system and then venting it to restore the system pressure to atmospheric pressure.
3.4
Vacuum Inerting
An atmosphere inerting method that reduces the oxygen concentration in the system by first evacuating the sealed system and then introducing inert gas to atmospheric pressure.
3.5
Sweep Through Inerting
Flow Through Inerting
An atmosphere inerting method that reduces the oxygen concentration in the system by continuously introducing inert gas into the system with exhaust ports.
3.6
Displacement Inerting
An atmosphere inerting method that reduces the oxygen concentration in the system by introducing inert gas with a significant density difference from the gas in the system, without significant gas mixing during the process.
3.7
Inert Dust Inerting
A fire - prevention technology that prevents the formation of explosive environments in the protected system or increases the difficulty of igniting the mixture by adding inert dust to the protected system.
3.8
Absolute Inerting
An inerting technology where the proportion of inert gas or added inert dust in the protected system is high enough that changes in the ratio of combustible material to oxygen - containing gas will not form explosive environments.
3.9
Partial Inerting
An inerting technology that prevents the explosive mixture formed by combustible material and air from being ignited by all foreseeable ignition sources by introducing inert gas or adding inert dust into the protected system.
3.10
Inert Gas
A gas that does not react with oxygen, flammable gases, flammable vapors, and flammable dust.
Note: Such as helium, neon, argon, krypton, xenon, and radon, which are elements in Group 18 of the periodic table.
3.11
Flue Gases
A mixture of gases and suspended particles produced by combustion.
Note: When flue gases are used for inerting, their oxygen concentration is limited to a certain range.
3.12
Limiting Oxygen Concentration; LOC
The maximum oxygen volume concentration in a mixture of combustible material, air, or oxygen, and inert gas that cannot form an explosive environment, as measured by a standard method.
Note: The limiting oxygen concentration is related to the characteristics of the combustible material and the type of inert gas.
3.13
Maximum Allowable Oxygen Concentration; MAOC
The maximum value of the oxygen concentration that ensures the safety of the system protected by inerting when certain foreseeable anomalies or misoperations occur.
Note: In actual engineering applications, the maximum allowable oxygen concentration is lower than the limiting oxygen concentration under working conditions.
3.14
Trip Point Oxygen Concentration of System Shutdown; TPSS
The oxygen concentration threshold at which the oxygen concentration monitoring device initiates the shutdown program of the protected system to ensure the safety of the process system and prevent the formation of explosive environments due to air entering.
Note: Shutdown does not mean the complete shutdown of the protected system, but stopping the operation of the protected system in a set safe manner and initiating emergency protection measures.
3.15
Setpoint Oxygen Concentration of Inerting System
The oxygen volume concentration threshold at which the oxygen concentration monitoring device begins to control the flow rate, pressure, or amount of inert gas to maintain the oxygen volume concentration within a safe range.
3.16
Safety Margin
