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Safety specification for the protection of dust explosion for grain processing, storage and transportation system
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| Standard ID | GB 17440-2025 (GB17440-2025) | | Description (Translated English) | Safety specification for the protection of dust explosion for grain processing, storage and transportation system | | Sector / Industry | National Standard | | Classification of Chinese Standard | C67 | | Classification of International Standard | 13.230 | | Word Count Estimation | 22,281 | | Date of Issue | 2025-01-24 | | Date of Implementation | 2026-02-01 | | Administrative Organization | Ministry of Emergency Management of the People's Republic of China | | Issuing agency(ies) | State Administration for Market Regulation, National Standardization Administration |
GB 17440-2025.Safety specification for dust explosion prevention in grain processing, storage and transportation systems
ICS 13.230
CCSC67
National Standard of the People's Republic of China
Replaces GB 17440-2008
Safety specification for dust explosion prevention in grain processing, storage and transportation systems
Released on 2025-01-24
2026-02-01 implementation
State Administration for Market Regulation
The National Standardization Administration issued
Table of Contents
Preface III
1 Range 1
2 Normative references 1
3 Terms and Definitions 1
4 Division and scope of grain dust explosion hazardous areas 2
5 Process system and equipment requirements 3
5.1 Process Design 3
5.2 Mechanical equipment 3
5.3 Grain drying system 5
6 Electrical Requirements 5
6.1 General requirements 5
6.2 Selection of electrical equipment 5
6.3 Electrical wiring 6
6.4 Lightning protection, anti-static and grounding 6
7 Architecture and Structure 6
7.1 General requirements 6
7.2 Ground 6
7.3 Door 6
8 Dust control requirements 7
8.1 Ventilation 7
8.2 Dust removal system 7
8.3 Dust collection 8
9 Dust cleaning requirements 8
10 Pneumatic conveying system requirements 8
11 Requirements for explosion control measures 8
11.1 General requirements 8
11.2 Explosion venting 9
11.3 Inerting 9
11.4 Flameproof 9
12 Operational safety management requirements 9
12.1 General Provisions 9
12.2 Production Operations 10
13 Verification Method 10
Appendix A (Informative) Classification and scope of grain dust explosion hazard areas 11
A.1 Example of method for zoning food dust explosion hazardous areas according to building space 11
A.2 Example of method for zoning food dust explosion hazardous areas according to type and distance of release source12
Appendix B (Informative) Selection of electrical equipment in hazardous areas of grain dust explosion 14
References 16
Preface
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents"
Drafting.
This document replaces GB 17440-2008 "Safety Regulations for Dust Explosion Prevention in Grain Processing, Storage and Transportation Systems" and is consistent with GB 17440-2008.
In addition to structural adjustments and editorial changes, the main technical changes are as follows.
--- Changed the scope (see Chapter 1, Chapter 1 of the.2008 edition);
--- Added the terms and definitions of "hazardous places (dust)", "non-hazardous places (dust)", "zone 20", "zone 21" and "zone 22" (see 3.7,
3.8, 3.9, 3.10, 3.11);
--- Deleted the term and definition of "grain dust" (see 3.6 of the.2008 edition);
--- Changed the classification and scope of food dust explosion hazardous areas (see Chapter 4, Chapter 4 of the.2008 edition);
--- Added process design requirements (see 5.1.4, 5.1.5, 5.1.6);
--- Changed the requirements for mechanical equipment (see 5.2, 5.2 of the.2008 edition);
--- Added requirements for grain drying systems (see 5.3);
--- Modified the requirements for electrical equipment selection, electrical circuits, lightning protection, anti-static protection and grounding (see Chapter 6, Chapter 6 of the.2008 edition);
--- Deleted the safety requirements for the use of radiation equipment and ultrasonic equipment (see Chapter 11, Chapter 12, 6.2.3 and
6.2.4);
--- Added requirements for motor surface temperature control during variable frequency speed regulation (see 6.2.5);
--- Changed the requirements for buildings and structures (see Chapter 7, Chapter 7 of the.2008 edition);
--- Changed the requirements for dust control and the negative pressure of the dust removal system (see Chapter 8, Chapter 8 of the.2008 edition);
--- Changed the requirements for dust cleaning (see Chapter 9, Chapter 9 of the.2008 edition);
--- Added requirements for pneumatic conveying (see 10.5, 10.6);
--- Added requirements for explosion control measures and verification methods (see Chapter 11 and Chapter 13);
--- Changed the requirements for job safety management (see Chapter 12, Chapter 13 of the.2008 edition).
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document is proposed and coordinated by the Ministry of Emergency Management of the People's Republic of China.
The previous versions of this document and the documents it replaces are as follows.
---First issued as GB 17440-1998 in.1998 and first revised in.2008;
---This is the second revision.
Safety specification for dust explosion prevention in grain processing, storage and transportation systems
1 Scope
This document specifies the classification and scope of grain dust explosion hazardous areas in grain processing, storage and transportation systems, process system and equipment requirements, electrical
Air requirements, building and structure requirements, dust control requirements, dust cleaning requirements, pneumatic conveying requirements, explosion control measures requirements, operation safety management requirements
The corresponding verification method is described.
This document applies to the design, operation and safety management of grain processing, storage and transportation systems involving combustible dust explosion hazards.
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document.
GB 12158 General requirements for preventing electrostatic accidents
GB 15577 Safety regulations for dust explosion prevention
GB/T 15604 Dust explosion-proof terminology
GB/T 15605 Dust explosion pressure relief specification
GB/T 37241 Inerting Explosion-Proof Guide
GB 50016 Code for Fire Protection Design of Buildings
GB 50057 Code for Lightning Protection Design of Buildings
GB 50058 Design specification for electrical installations in explosive atmospheres
GB 55037 General code for fire protection of buildings
3 Terms and definitions
The terms and definitions defined in GB/T 15604 and the following apply to this document.
3.1
Grain
A general term for agricultural products for human consumption.
Note. Mainly refers to crops such as wheat, corn, rice, soybeans, oilseeds and their semi-finished products, semi-finished products and finished products.
3.2
Grain processing
The process of turning raw grains into finished or semi-finished grains through specific processes.
3.3
Through grain circulation facilities and equipment, grain is transported and stored according to specific processes, methods and routes.
3.4
Source of dust release
A place or part that can release combustible dust into the atmosphere.
......
GB 17440-2008
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 13.230
C 67
Replacing GB 17440-1998
Safety regulations for the protection of dust explosion for
grain processing, storage and transportation system
ISSUED ON. DECEMBER 11, 2008
IMPLEMENTED ON. OCTOBER 01, 2009
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 6
4 Zoning and range of grain dust explosion hazardous areas ... 7
5 Process device ... 9
6 Electrical ... 12
7 Building and structure ... 16
8 Dust control ... 17
9 Dust cleaning ... 20
10 Pneumatic conveying ... 21
11 Safety precautions for radiation device use ... 21
12 Safety precautions for use in ultrasonic device ... 22
13 Operational safety management ... 22
Appendix A (Informative) List of monitoring device setting for the main
machinery device operation status in dust explosion hazardous area ... 25
Appendix B (Informative) Grain dust characteristics table ... 26
Appendix C (Informative) Descriptions of standard clauses ... 27
Foreword
All the technical contents of this standard are mandatory.
This standard is the revision of GB 17440-1998 “Safety regulations for the
protection of dust explosion for grain processing, storage and transportation
system” based on the dust explosion-proof practical experience of China's grain
storage and transportation, processing system in recent years.
This standard replaces GB 17440-1998 “Safety regulations for the protection of
dust explosion for grain processing, storage and transportation system”.
As compared with GB 17440-1998, main changes of this standard are as
follows.
- In the Scope, ADD that “it does not apply to grain drying device”;
- ADD the terms of dust release source and explosive dust atmosphere;
- CHANGE the dust explosion hazardous zone classification into zone 20,
21 and 22;
- ADD the dust explosion hazardous zoning of the relevant places of the
plant oil factory;
- The choice of electrical device is divided into type A device and type B
device;
- MODIFY the requirements for building (structure) in accordance with the
relevant fire protection code;
- CHANGE the contents related to ventilation and dedusting into the “Dust
control” chapter;
- ADD the “Pneumatic conveying” chapter;
- ADD the requirements of radiation device and ultrasonic device;
- CHANGE the original chapter “Management” into “Operational safety
management”;
- CHANGE the original Appendix A “Grain dust characteristics table” into the
Appendix B “Grain dust characteristics table”;
Safety regulations for the protection of dust explosion for
grain processing, storage and transportation system
1 Scope
This standard specifies the basic requirements for the protection of dust
explosion for grain processing, storage and transportation system.
This standard applies to the whole process of design, construction, production
and management of newly built, extended, and reconstructed projects which
may have grain dust explosion hazardous places in the grain processing,
storage and transportation process.
This standard does not apply to grease leaching plant and grain drying device.
2 Normative references
The provisions in following documents become the provisions of this Standard
through reference in this Standard. For the dated references, the subsequent
amendments (excluding corrections) or revisions do not apply to this Standard;
however, parties who reach an agreement based on this Standard are
encouraged to study if the latest versions of these documents are applicable.
For undated references, the latest edition of the referenced document applies.
GB 12476.1 Electrical apparatus for use in the presence of combustible dust
- Part 1-1. Electrical apparatus protected by enclosures and surface
temperature limitation - Specification for electrical apparatus (GB 12476.1-
2000, idt IEC 61241-11.1999)
GB 12476.2-2006 Electrical apparatus for use in the presence of
combustible dust - Part 1-2. Electrical apparatus protected by enclosures
and surface temperature limitation - Selection, installation and maintenance
of electrical apparatus (IEC 61241-1.1999, IDT)
GB/T 15604 Terminology for dust explosion prevention
GB 50016 Code of design on building fire protection and prevention
GB 50057 Design code for protection of structures against lightning
5 Process device
5.1 Process design
5.1.1 Grain processing, storage and transportation system design shall follow
the principle of overall fortification, AND be in strict compliance with the
technical requirements for dust explosion prevention.
5.1.2 The design documents shall clearly state the zoning of the grain dust
explosion hazardous zone in the design, AND propose a clear and specific
measures and methods for dust explosion prevention on the building structure,
process selection, device type selection and layout, dust control, electrical and
management, etc.
5.1.3 It is preferable for the device prone to dust explosion to be arranged
outdoors; however, if it is arranged indoor, it is preferable for it to be at a higher
position in the building AND close to the exterior wall.
5.1.4 Process piping and dedusting network shall not be through unrelated
buildings. There shall be no unrelated pipes passing through dangerous areas.
5.1.5 It is not preferable for the process pipeline and dedusting network to be
laid in multiple layers in the same rack with the heat pipe. When they are laid in
multiple layers in the same rack with utilities pipelines, it is preferable to place
the pipeline having a medium temperature higher above normal temperature at
the upper layer, AND to take thermal insulation measures.
5.2 Machinery and device
5.2.1 General requirements
5.2.1.1 For the stationary machinery and device used in hazardous areas of
grain dust explosion, it is preferable to take explosion-proof measures. When
using the explosion pressure venting method, it is preferable for the venting port
to be lead outdoor to a safe direction through the pipeline.
5.2.1.2 The observation window (door), removable cover (door), and ventilation
holes can be regarded as explosion pressure venting port.
5.2.1.3 The highest level of material in the device or silo shall not exceed the
lower edge of the venting port. The venting ports shall be located so that they
will not make the surroundings be exposed to flames and gas hazards.
Explosion pressure venting process shall not endanger personnel or limit the
operation of safety-related device.
5.2.2.2 Screw conveyor
- Spiral shall be flexible, its clearance with the housing shall comply with
requirements, AND it shall be free from scratching or jamming.
5.2.2.3 Buried scraper conveyor
- Scraper chain shall correctly engage when running into the head pulley,
AND it shall be free from chain jamming or jumping.
5.2.2.4 Roller belt conveyor and air cushion belt conveyor
- Conveyor belt shall run smoothly, the deviation is in the specified range,
AND the belt shall not direct scratch the bracket and cover.
5.2.3 Measuring device
- It shall provide the air balancing device ensuring the scale inside pressure
balance and avoiding dust fly in between the discontinuous weighing
scale’s upper hopper and lower hopper, AND it is preferable to connect it to
the dust control system.
5.2.4 Cleaning device
- Mesh shall be smooth, there shall be no congestion.
5.2.5 Dedusting device
- The type and structure of dust collector shall meet the dust control
requirements;
- It is preferable for the dust collector to take the explosion pressure venting
method, with sufficient pressure venting area;
- Explosion-proof membrane shall ensure the sealing, AND it shall be able to
withstand the maximum suction pressure produced by the fan at different
conditions.
5.2.6 Processing device
5.2.6.1 When the grain enters high-speed rotating device for grinding, crushing,
cutting and shelling, etc., the device for magnetic separation to remove metal
impurities and the cleaning device to remove inorganic impurities and other
impurities shall be provided before these devices.
5.2.6.2 It shall close in time the non-operating circuit (including the branch), so
as to prevent the accident from spreading in case of fault.
6.2.8 It shall use the dust explosion-proof type lighting device in the zone 20,
21 and 22. AND the net distance between the lighting fixture and the grain shall
not be less than 500 mm.
6.2.9 It is not preferable to use the mobile electrical device in zone 20, 21 and
22. If it is necessary to use mobile electrical device, it shall use the YC or YCW
rubber cable.
6.3 Cabling
6.3.1 Cables (wires) that are not related to dangerous area shall, as far as
possible, not pass through dangerous areas. If unavoidable, they shall comply
with the provisions of electrical wiring in dangerous dust explosion areas.
6.3.2 The types of cabling used in zone 20, 21 and 22 may be.
- The cable shall be laid in a seamless or seam welded steel pipe with a
threaded connection;
- Cable itself has sufficient mechanical strength, AND is able to prevent
mechanical damage and combustible dust intrusion.
6.3.3 Cable systems and accessories shall be installed at locations, as far as
possible, free from mechanical damage, corrosion, chemical effects and
thermal effects. If unavoidable, it shall be installed in a conduit or select the
appropriate cable.
6.3.4 If the cable or conduit system is subject to vibration, it shall be designed
into a structure which can...
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