Valid

GB/T 16425-2025Risk assessment and characteristic parameter determination methods of combustible dust explosion (English PDF)

可燃性粉尘爆炸风险评估及特性参数测定方法

Preview PDF

This is a limited preview

Buy now to download the full PDF (52 pages)

Need quotation for your management?

Get a formal quotation for GB/T 16425-2025 in 30 minutes.

Issued by

State Administration for Market Regulation; Standardization Administration of China

Level / Type

National · Recommended

Issue date

December 2, 2025

Implementation date

January 1, 2027

Scope

GB/T 16425-2025 is the English-translated version of 可燃性粉尘爆炸风险评估及特性参数测定方法.

GB/T 16425-2025 is the Chinese standard "Risk assessment and characteristic parameter determination methods of combustible dust explosion".

Its scope clause reads: This document describes the risk assessment of combustible dust explosions, methods for identifying combustible dust, the maximum explosion pressure of dust clouds, and the maximum pressure at which they can be released.

Methods for determining the rate of ascent, methods for determining the lower explosive limit concentration of dust clouds, methods for determining the resistivity of dust layers, and methods for determining the minimum ignition temperature of dust layers.

Methods for determining the limiting oxygen concentration of dust clouds, methods for determining the limiting oxygen concentration of dust clouds, and methods for determining the spontaneous combustion temperature of accumulated dust.

This document applies to risk assessment of dust explosion hazard locations in enterprises and the testing and determination of combustible dust characteristic parameters.

This document does not apply to risk assessments and related dust characteristics in coal mines, fireworks and firecrackers, explosives, and strong oxidizer environments.

Numerical tests were conducted to determine the results. Its clauses include terms and definitions.

Found what you need?

Document preview — GB/T 16425-2025

National Standard of the People's Republic of China

ICS: 13.230
Classification: C67

Issued by: State Administration for Market Regulation; Standardization Administration of China

Preface
1.Scope
2 Normative References
3.Terms and Definitions
4.Combustible dust explosion risk assessment 3.
4.1 General Requirements
4.2 Evaluation Procedure
4.3 Planning and Preparation
4.4 Risk Identification
4.5 Risk Analysis and Classification
4.6 Risk Management
4.7 Assessment Report
5.Methods for determining combustible dust.
5.1 Sample
5.2 Test Apparatus
5.3 Test Procedure
5.4 Test Methods
5.5 Safety Measures
5.6 Test Report
6.1 Sample
6.2 Test Apparatus
6.3 Test Procedure
6.4 Experimental Data Processing
6.5 Safety Measures
6.6 Test Report
7.Method for determining the lower explosion limit concentration of dust clouds
7.1 Sample
7.2 Test Apparatus
7.3 Test Procedure
7.4 Safety Measures
7.5 Test Report
8.Method for measuring the resistivity of dust layer
8.1 Sample
8.2 Test Apparatus
8.3 Test Procedure
8.4 Safety Protection
8.5 Test Report
9.Method for determining the minimum ignition temperature of dust layers
9.1 Sample
9.2 Test Apparatus
9.3 Test Procedure
9.4 Experimental Data Processing
9.5 Safety Measures
9.6 Test Report
10.Method for determining limiting oxygen concentration in dust clouds
10.1 Sample
10.2 Preparation and calibration of inert gas/air mixtures with different oxygen concentrations
10.3 Test Apparatus
10.4 Test Procedure
10.5 Safety Measures
10.6 Test Report
11 Method for determining the spontaneous combustion temperature of accumulated dust
11.1 Sample
11.2 Test Apparatus
11.3 Test Methods
11.4 Experimental Data Processing
11.5 Safety Measures
11.6 Test Report
Appendix A (Informative) List of processes and equipment in workplaces that may generate explosive dust environments
Appendix B (Informative) Method for Risk Classification of Combustible Dust Explosions
Appendix C (Informative) Calculation Method for the Number of Personnel Involved in Flour-Related Operations
Appendix F (Informative) Example 47 of the search algorithm for L and H
References

1 Scope

This document describes the risk assessment of combustible dust explosions, methods for identifying combustible dust, the maximum explosion pressure of dust clouds, and the maximum pressure at which they can be released.

This document applies to risk assessment of dust explosion hazard locations in enterprises and the testing and determination of combustible dust characteristic parameters.

This document does not apply to risk assessments and related dust characteristics in coal mines, fireworks and firecrackers, explosives, and strong oxidizer environments.

Numerical tests were conducted to determine the results.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.

This document.

GB/T 15604 Dust Explosion Prevention Terminology

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

Industrial and commercial enterprises in sectors such as metallurgy, non-ferrous metals, building materials, machinery, light industry, textiles, tobacco, and commerce that pose a risk of combustible dust explosions.

3.2

The maximum number of workers at a single shift working at a powder-related workstation.

Note. The main areas of workstations with the greatest dust exposure include production workshops with dust explosion hazards, structures through which dust collection pipelines pass, and areas adjacent to areas with explosion hazards.

The work area also lacks isolation facilities.

3.3 combustible dust

Explosive dust

Dust fibers or fluff that can undergo a violent oxidation reaction with gaseous oxidants under atmospheric conditions.

Note 1.The gaseous oxidant is mainly air.

Note 2.Combustible dust can explode under certain conditions.

3.4

Under atmospheric conditions, a mixture of combustible dust and gaseous oxidant, once ignited, can maintain an environment conducive to the spontaneous propagation of combustion.

Note. The gaseous oxidant is mainly air.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 52 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 15604Terminology for dust explosion prevention and protection

Cited by

Similar standards

GB 16543-2008|GB 16543-2025|GB 17440-2025|GB 17919-2025|GB 18154-2025

Editions of GB/T 16425

Edition	Title	Revision	Status
GB/T 16425-2025	Risk assessment and characteristic parameter determination methods of combustible dust explosion	current edition	Current
GB/T 16425-2018	Determination for minimum explosive concentration of dust clouds	previous edition	Superseded
GB/T 16427-2018	Determination for electrical resistivity of dust layers	merged into this edition	Superseded
GB/T 16430-2018	Determination of the minimum ignition temperature of dust layer	merged into this edition	Superseded

This page sells the current edition, GB/T 16425-2025. Earlier editions are listed for reference only.

How to Download GB/T 16425-2025

1
Add to cart
Click "Download PDF" on this page and choose "Buy this standard". You can add more standards before checkout.
2
Checkout
Enter your email and billing details. Payment is processed securely by Stripe (cards or bank transfer). Prefer bank details? Request a quotation (min. order $300).
3
Instant delivery (0–9 sec)
Delivery is automatic: within seconds of payment you'll receive an email with a secure download link. The link stays valid for 72 hours.
4
Invoice included
A tax invoice is attached to the confirmation email. Need a custom invoice? Contact us.