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AQ 4273-2016Safety Specifications for Dedusting System Used in Dust Explosion Hazardous Area (English PDF)

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Issued by

State Administration of Work Safety of the People’s Republic of China

Level / Type

National · Mandatory

Issue date

August 29, 2016

Implementation date

March 1, 2017

Scope

AQ 4273-2016 (Safety Specifications for Dedusting System Used in Dust Explosion Hazardous Area) is available as an English-translated PDF.

AQ 4273-2016 — This Standard specifies the requirements for explosion-proof measures, maintenance and overhaul, detection and verification of dedusting system that are used in dust explosion hazardous area.

This Standard applies to the design, manufacturing, installation, acceptance, use and maintenance of dedusting system that are used in dust explosion hazardous area.

This Standard does not apply to dedusting system that are used in production sites of chemicals, mining, tunneling, fireworks and firecrackers, and commercial explosive materials.

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Document preview — AQ 4273-2016

National Standard of the People's Republic of China

ICS: 13.100
Classification: C 65

Issued by: State Administration of Work Safety of the People’s Republic of China

Foreword...3
1 Scope...4
2 Normative References...4
3 Terms and Definitions...5
4 General...6
5 Deduster...8
6 Dust Hoods and Dust Cabinets...12
7 Air-Duct...12
8 Fans...14
9 Explosion-proof Device...14
10 Electrical Safety and Anti-Static Measures...16
11 Deduster and Air-duct's Layout and Safety Measures...16
12 Dust Cleaning...18
13 Maintenance-Overhaul, Testing and Verification...19

Foreword

All the technical content of this Standard is compulsory, except Clauses 1, 2 and

3, 5.1.4c), 5.1.7c), 6.3.7.1.1, 7.1.6, 7.1.7, 9.3a).

This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This Standard was proposed by the Fourth Supervision Division of the State

Administration of Work Safety.

This Standard shall be under the jurisdiction of Technical Subcommittee 5 on Dust

Explosion Prevention of National Technical Committee 288 on Work Safety of

Standardization Administration of China (SAC/TC 288/SC 5).

The drafting organizations of this Standard. Guangdong Jinfangyuan Safety

Technology Testing Co., Ltd., Sinosteel Corporation Wuhan Safety & Environmental

Protection Research Institute. Safety Enginerring Research Center of NEU,

Guangzhou Gan Feng Machinery Equipment Co., Ltd., Guangzhou Tongsheng

Environmental Protection Technology Co., Ltd.

1 Scope

This Standard specifies the requirements for explosion-proof measures, maintenance

and overhaul, detection and verification of dedusting system that are used in dust

explosion hazardous area.

This Standard applies to the design, manufacturing, installation, acceptance, use and

maintenance of dedusting system that are used in dust explosion hazardous area.

This Standard does not apply to dedusting system that are used in production sites of

chemicals, mining, tunneling, fireworks and firecrackers, and commercial explosive

materials.

2 Normative References

The following referenced documents are indispensable for the application of this

document. For dated references, only the edition dated applies to this document. For

undated references, the latest edition of the referenced documents (including all

amendments) applies to This Standard.

GB 2894, Safety Signs and Guideline for the Use

GB 7231, Basic Identification Colors and Code Indications and Safety Sign for

Industrial Pipelines

GB 12158, General Guideline for Preventing Electrostatic Accidents

GB 12476.1, Electrical Apparatus for Use in the Presence of Combustible Dust -

Part 1. General Requirements

GB 12476.2, Electrical Apparatus for Use in the Presence of Combustible Dust -

Part 2. Selection and Installation

GB 15577, Safety Regulations for Dust Explosion Prevention and Protection

GB/T 15605, Guide for Pressure Venting of Dust Explosions

GB/T 16758, The Classification and Technical Specification of Exhaust Hood

GB/T 17919, Directives for Dust Explosion Protection for Deduster in Dust

Explosion Hazardous Area

GB 50019, Code for Design of Heating Ventilation and Air Conditioning in Industrial

Buildings

GB 50057, Design Code for Protection of Structures against Lightning

GB 50058, Code for Design of Electrical Installations in Explosive Atmospheres

AQ 7005, Safety Requirements for the Use of Woodworking Machinery

3 Terms and Definitions

For the purposes of this Standard, the following terms and definitions apply.

3.1

dust

small solid particles in the atmosphere which settle out under their own weight, but

which may remain suspended in air for some time.

3.2

combustible dust

dust that can burn or glow in air and could form explosive mixtures with air at

atmospheric pressure and normal temperatures.

3.3

dust explosion hazardous area

the sites at where combustible dust, combustion-supporting gas or ignition source is

present.

3.4

dedusting system

a system which is used to gather the solid particles in gas- and solid-phase flows,

comprising dust collection hood or dust collection cabinet, air hose, fan, dust catcher

and control device.

3.5

explosion-proof device

the device which adopt the technique of prevention and control of dust explosion, to

prevent the formation of dust clouds or possible ignition sources and put combustible

If there exists toxic, corrosive dust and combustible dust, the deduster and air-duct

shall not adopt explosion-venting device for pressure release; it shall select the

explosion-suppression device that can charge fire extinguishing gas or powder media

into the deduster and air-duct to extinguish flames.

4.3 The box of the deduster shall meet the following requirements.

a) The box is made of a steel metallic material, or select flame-resistant materials

and take anti-static measures if other materials are used; it shall not use

aluminium metallic materials.

b) The design strength of the box shall be able to withstand the maximum explosive

pressure generated after explosion-proof measures are adopted; and the box

installed in buildings shall adopt steel metallic materials and welding structures.

c) The included angles between the box-plates of a square-box shall be arc-treated.

d) The internal surface of the box shall be smooth; the box made of steel metallic

material shall be treated for rust-proofing; aluminium coating shall not be used.

4.4 The operating conditions of the dry deduster shall include continuous dust

discharging and continuous dust conveying. It should not adopt settling chamber to

perform dust treatment.

4.5 The deduster used in explosion hazardous areas of aluminium-magnesium dust

and wooden product dust shall work under negative pressure conditions; for other dust

explosion areas, if dedusting system adopts positive pressure to blow dust, then it shall

adopt reliable measures to prevent the ignition sources.

4.6 Aluminium-magnesium dust shall not share the same dedusting system with iron

dust and other kinds of combustible dust; and the dedusting system shall not connect

with air-duct and equipment that carry combustible gas, high-temperature gas, smoke

dust and other industrial gases.

4.7 The entry of sparks into the air-duct and deduster of the dedusting system is not

allowed. For the production-processing system that exists suction of sparks into the

air-duct through dust hood or dust cabinet, it shall adopt the measures to block sparks

to enter into the air-duct and deduster.

4.8 The dedusting system shall be set up with control device meeting the following

requirements.

a) Start and stop. The dedusting system shall be started before the production-

processing system. When the production-processing system is stopped, the

dedusting system shall be delayed for 10 min before being stopped.

b) Protection interlock. The dedusting system shall be set up with protection

interlocking device. When the monitoring device give an acoustic-optical alarm

c) Dust conveying device should adopt pneumatic dust conveying; it should not

adopt scraper dust conveyors and spiral dust conveyors.

d) The safety requirements for pneumatic dust conveying.

-- The air-volume and air-velocity of the designed pneumatic dust conveying duct

shall be calculated based on that no dust will block the duct and the duct

temperature is not higher than 70°C.

-- Set up air pressure monitoring alarm device which give acoustic-optical alarm

signals when the air pressure is lower than the design value.

-- Set up dust discharging openings every 6 m of horizontal dust conveying duct

and in the positions where the angle of air-duct elbow is greater than 45°. The

dust discharging openings shall be sealed-closed in the non-discharging state.

The design strength shall be greater than the design strength of the air-duct.

-- In the positions where the angle of air-duct's elbow is greater than 45°, set up

observation window to monitor the dust flowing in the duct. The design

strength shall be greater than the design strength of the air-duct.

-- For the duct of the length greater than 10 m, set up explosion-proof device as

specified in 4.2.

e) The safety requirements for scraper dust conveying.

-- Use the sealed-closed dust conveying method. Do not discharge dust to the

outside of the scraper conveyor during the dust conveying operation.

-- The operating speed of the designed scraper dust conveyor shall be calculated

based on that dust will not block in the scraper dust conveyor.

-- Set up the monitoring-alarm device for the operating speed of the scraper dust

conveyor; and they shall give acoustic-optical alarm signals when the

operating speed deviates from the set value.

-- The scraper shall be made of flame-resistant and antistatic materials.

-- Set up manholes for dust discharging, overhauls and repairs every 6 m of the

scraper dust conveyor. The manholes shall be sealed-closed when dust

discharging, overhauls and repairs are not done.

-- Set up observation window to monitor the operating state of the scraper dust

conveyor.

-- If the conveying length of the scraper dust conveyor is greater than 10 m, set

up explosion-proof device as specified in 4.2.

f) The safety requirements for spiral...

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 19 pages — is available in the English PDF.

Referenced standards

Normative references

GB 12476.2 · GB/T 15605 · GB 50019 · GB 50058

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