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GB 17440-2008: Safety regulations for the protection of dust explosion for grain processing, storage and transportation system
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 betwee...