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GB 19081-2008: Safety regulations for dust explosion prevention in feed processing system
GB 19081-2008
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 13.230
C 67
Replacing GB 19081-2003
Safety Regulations for Dust Explosion
Prevention in Feed Processing System
ISSUED ON. DECEMBER 11, 2008
IMPLEMENTED ON. OCTOBER 01, 2009
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Terms and Definitions ... 5
4 General Provisions ... 5
5 Naked-fire Job ... 6
6 Building (Structure) ... 7
6.1 General ... 7
6.2 Building structure ... 7
6.3 Fire protection and firefighting for general plane ... 8
7 Electrical Design ... 8
7.1 Classification of hazardous zone of feed dust explosion ... 8
7.2 General requirements ... 9
7.3 Electrical equipment ... 10
7.4 Electrical wiring ... 10
7.5 Lightning protection and grounding ... 11
8 Process Design and Equipment ... 12
8.1 General provisions ... 12
8.2 Bucket elevator ... 12
8.3 Slide pipe, pipe fittings, buffer bucket ... 13
8.4 Buffer device ... 13
8.5 Screw conveyor and en-masse conveyor ... 13
8.6 Grain delivery machine ... 13
8.7 Magnetic separator ... 13
8.8 Grinder ... 13
8.9 Batching scale, mixer and buffer hopper ... 13
8.10 Air compressor ... 14
8.11 Heating device ... 14
8.12 Dryer ... 14
9 Dust Removal and Pneumatic Conveying System ... 14
Foreword
This Standard modified and replaced GB 19081-2003 Safety Regulations Dust
Explosion for Prevention and Protection in the Feed Processing System.
The 4.10, 6.2.3, 6.3.1, 7.2.1, 7.2.4, 7.3.1, 7.3.4, 7.3.5, 7.4.6, 7.5.3, 7.5.7, 8.2.2, 8.2.4,
8.4, 8.8, 8.9.3, 8.10, 9.3, 9.8 in this Standard are recommended, while the rest are
mandatory.
The major technical changes between this Standard and GB 19081-2003 Safety
Regulations Dust Explosion for Prevention and Protection in the Feed Processing
System are as follows.
--- Added the grinder feeding system can be set iron-absorption and gravity
settlement mechanism;
--- Added the requirements for magnetic separator;
--- Added the requirements for dryer system;
--- Modified and improved the definitions and clauses of the terms;
--- Combined the two Clauses of dust removal and pneumatic conveying system;
adjusted the contents.
This Standard was proposed by State Administration of Production Safety Supervision.
This Standard shall be under the jurisdiction of Dust Explosion Prevention
Subcommittee of National Technical Committee for Standardization of Production
Safety (SAC/TC 288/SC 5).
Drafting organizations of this Standard. Henan University of Technology, Wuhan Safety
and Environmental Protection Research Institute, Wuxi Research and Design Institute of
State Bureau of Grain Reserve, Zhengzhou Research and Design Institute of State
Bureau of Grain Reserve, and Beijing Research and Design Institute of State Bureau
of Grain Reserve.
Chief drafting staffs of this Standard. Zhou Nairu, Zhu Fengde, Wang Weiguo, Wang
Yongchang, Qi Zhigao, Li Qian, Lin Xi, Wang Zhi, and Gu Qinghong.
The historical edition replaced by this Standard is as follows.
--- GB 19081-2003.
Safety Regulations for Dust Explosion
Prevention in Feed Processing System
1 Scope
This Standard specifies the basic requirements for dust explosion prevention in feed
processing system.
This Standard is applicable to the design, construction, operation and management for
dust explosion prevention in feed processing system.
2 Normative References
The provisions in following documents become the provisions of this Standard through
reference in this Standard. For dated references, the subsequent amendments
(excluding corrigendum) 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 15577 Safety Regulations for Dust Explosion Prevention and Protection
GB/T 15604 Terminology for Dust Explosion Prevention
GB/T 15605 Guide for Pressure Venting of Dust Explosion
GB 17440 Safety Regulations for the Protection of Dust Explosion for Grain
Processing Storage and Transportation System
GB/T 17919 Directives for Dust Explosion Protection for Dust Collectors in Dust
Explosion Hazardous Area
GB 50016 Code of Design on Building Fire Protection and Prevention
GB 50057 Design Code for Protection of Structures against Lightning
GB 50058 Code for Design of Electrical Installations in Explosive Atmospheres
4.4 The ventilation and dust removal, vent explosion, explosion prevention facilities
shall not be removed, altered and discontinued without the consent of the competent
department.
4.5 Unproductive open-flame shall be eliminated from the system; while the feed
processing workshop shall not store the flammable, explosive materials.
4.6 The device that is used for removing the metal impurities and other debris from
the materials shall be installed before the grinding system.
4.7 When the system is being operated and needs to conduct the maintenance work,
the explosion prevention hand tools shall be used.
4.8 The heat-resistant surface shall meet the following requirements.
--- The drying equipment shall use the heat insulation layer;
--- All equipment’s bearings shall be dust-proof and sealing, in good lubrication state.
4.9 The anti-static grounding shall meet the requirements of GB 15577.
4.10 The cleaning of accumulative dusts shall conform to the following provisions.
--- Regular cleaning system shall be established; timely clean the accumulative
dusts on the rotation and heating positions of the feed processing equipment;
--- The negative pressure dust absorption device shall be used to perform the
cleaning operation rather than using the compressed air.
4.1.1 Before maintenance and after the shutdown of the equipment within the feed
processing system, the equipment’s internal accumulative materials and external
accumulative dust shall be cleaned completely.
4.1.2 The explosion prevention safety inspection shall be performed regularly
according to the dust explosion prevention implementation rules and safety inspection
rules.
5 Naked-fire Job
5.1 During the system operating period, the naked-fire operation shall not be
performed.
5.2 Classify the fire prevention and explosion prevent work areas according to the
specific situations; make clear each area’s approval authority for the naked-fire
operations.
5.3 Before implementing the naked-fire operation, it shall be approved by the
6.2.4 The ground, wall and roof of the silos and feed processing workshop shall be
flat and easy to clean.
6.2.5 The fire resistance rating, number of floors, floor area, fire protection spacing,
evacuation passage for vent explosion and safety of feed processing workshop shall
conform to the relevant clauses of GB 50016.
6.2.6 The feed processing workshop and work tower for vertical silos shall establish
independent firefighting staircases; while the connecting door between the staircase
and workshop shall be set fire protection door.
6.2.7 As the explosion vent, the window shall adopt the open-to-outside type.
6.3 Fire protection and firefighting for general plane
6.3.1 When the feed processing workshop, raw material warehouse, auxiliary
mater...