GB/T 29304-2012Safety guide for explosion protection in explosive hazardous areas (English PDF)

3.1 Explosive atmospheres

Under ambient conditions, the atmosphere in which the mixture of gas, vapor, mist or dust-like combustible material and air is ignited and the combustion propagates throughout the unburned mixture.

3.2 Hazardous areas

The area in which the amount of hazardous atmosphere existed or expected to exist is sufficient to require that special precautions be taken on the structure, installation and use of electrical equipment.

3.3 Equipment for use in explosive atmospheres

The general term of the electrical explosion proof equipment and non-electrical explosion proof equipment which is used alone or in combination in the explosive atmosphere which can prevent explosion caused by its potential ignition source. For example, machinery, instrumentation, stationary or mobile devices, control units, instruments and probing or protection system that may cause explosion due to their own potential ignition sources during the energy generation, transmission, storage, measurement, control, conversion and/or material processing, etc.

3.4 Protective systems for use in explosive atmospheres

"Protective system" refers to some design unit that immediately stops the explosion that has just occurred and/or limits the effective range of the explosion flame and explosion pressure. The protective system can be fitted to the device or be put on the market separately as an autonomous system.

3.5 Components for use in explosive atmospheres

Any component that is critical to the safety functions of the equipment and protective system but does not function autonomously.

3.6 Equipment groups and protection level

3.7 Intended use

Depending on the category and grade of equipment, all equipment, the protective system and the equipment specified in 1.3 required for the safe operation of the equipment, protective system, and component provided by the manufacturer.

3.8 Working equipment

Any instrument, equipment, tool, or device used in the work.

5.1 Overview

This chapter is the minimum requirement for the owner's responsibility.

5.2 Explosion prevention and explosion protection

In order to prevent explosions and provide explosion protection, owners shall adopt technical and/or organizational measures appropriate to their operational activities in the order of priority and on the following basic principles.

5.3 Explosion hazard assessment

5.4 General responsibility

In order to ensure the safety and health of the workers, in accordance with the basic principles of risk assessment and the principles as proposed in 5.2, the owners shall take the necessary measures to ensure that.

5.5 Cooperative responsibility

When there are workers from different enterprises in the same workplace, each owner is responsible for all matters within his or her responsibility scope.

5.6 Place where an explosive atmosphere may occur

5.6.1 It shall, in accordance with the requirements of Appendix B, zone the areas where explosive atmosphere may occur.

5.6.2 It shall ensure that the areas as mentioned in 5.6.1 reach the minimum requirements of Appendix E and Appendix C.

5.8 Particular requirements

for work equipment and workplace 5.8.1 The working equipment that has been used or first put into operation in the enterprise or project before the implementation of this standard and used in the places where explosive atmospheres may occur shall, if no other standard is applicable or only partially applicable since the implementation of this standard, comply with the minimum requirements of Appendix E.

6.1 Other explosive hazardous areas than coal mine gas and/or

combustible coal dust atmosphere The principles for dividing the other explosive hazardous areas than coal mine gas and/or combustible coal dust atmosphere are as shown in Appendix B.

6.2 Hazardous areas of coal mine gas and/or combustible coal dust

atmosphere The requirements for the hazardous areas of coal mine gas and/or combustible coal dust atmospheres shall comply with the relevant provisions of the current national Coal mine safety regulations based on the actual conditions of China.

7.1 General requirements

7.1.1 The equipment used in the explosive hazardous area shall be manufactured in accordance with this standard, to ensure that the equipment, protective system, and the devices applicable to this standard as specified in 1.3 are able to be correctly installed, maintained and used for the specified purposes. Under this condition, they can only be put into market and use provided that they do neither endanger personnel health and safety nor endanger the safety of livestock and property.

7.1.5 The equipment is able to withstand the expected dangerous physical and chemical effects such as static or dynamic loads, liquids or gases, heat or unusual weather, without causing any danger.

7.1.6 When manufacturing equipment, it is only allowed to use the materials which can withstand the physical and chemical impacts such as aging, corrosion, and radiation occurred in the course of intended use.

7.1.7 The design of the equipment used in explosive hazardous areas shall be ergonomically constructed to reduce labor intensity and ease of use, and to be able to prevent hazards.

7.2 Electrical hazard protection

7.2.1 It may use the insulation protection technology, direct contact protection technology, indirect contact protection technology, etc., to provide adequate protection against the danger caused by the direct effect of electrical energy when the electrical equipment is for intended use.

7.2.2 When basic insulation is damaged and there is a risk of fault contact voltage, additional insulation or reinforced insulation shall be evaluated separately.

7.3 Non-electrical hazard protection and mechanical hazard protection

7.3.1 Equipment shall have sufficient mechanical strength, good shell protection and the corresponding stability, and the structure adapted to transport.

7.3.2 It shall take appropriate measures to avoid the equipment in normal use from contacting with or approaching hazardous moving parts, avoid the hazards caused by the flying of metal chip and dust, as well as to avoid the harm caused by liquid and gas spills.

7.4 Electrical connection and mechanical connection

7.4.1 Electrical equipment shall be set up power connection device. The green / yellow combined insulation cores in the power cord can only be connected to the dedicated grounding terminals. The power cord shall be connected with screws, nuts or equivalent, and be positioned by special fixtures.

7.5 Operational hazard protection

7.5.1 When the equipment is in operation, technical means such as protective cover, window guard or chip evacuation device may be used to prevent the objects or components and the debris, dust and the like from being thrown out during the operation. However, the impact, friction, static electricity and so on they may bring shall be avoided.

7.6 Power control and its hazard protection

7.6.1 Where applicable, electrical equipment shall be capable of being powered on, off or controlled to provide maximum safety.

7.6.2 Control devices and interlocking mechanisms shall have a hazard protection function.

8.1 Category I equipment

8.1.1 Equipment contained in Ma level

Its design and, if necessary, the configuration of special additional protections allow it to operate in accordance with the manufacturer's set operating parameters AND guarantee a high degree of protection.

8.1.2 Equipment contained in Mb level

It shall be designed so that it functions in accordance with the manufacturer's operating parameters AND guarantees a high level of protection.

8.2 Category II equipment

8.2.1 Equipment contained in Ga level

It shall be designed so that it functions in accordance with the manufacturer's operating parameters AND guarantees a high level of protection.

8.2.2 Equipment contained in Gb level

It is designed so that it functions in accordance with the manufacturer's operating parameters AND guarantees a high level of protection.

8.3 Category III equipment

8.3.1 Equipment contained in Da level

It shall be designed so that it functions in accordance with the manufacturer's operating parameters AND guarantees a high degree of protection.

9.1 Overview

The purpose of this chapter is to describe the basic requirements for the design and construction of equipment and systems used in explosive hazardous areas to maintain normal function and explosion-proof safety.

9.2 Common requirements for equipment and protective systems

9.2.1 General requirements

9.2.1.1 Overall explosion proof safety principles

Equipment and protective systems used in explosive atmospheres shall be considered and designed from the standpoint of overall explosion proof safety. Therefore, manufacturers shall take measures to.

9.2.1.3 Special inspection and maintenance conditions

As for the equipment and protective systems with special inspection and maintenance conditions, it shall consider these conditions in designing and manufacturing.

9.2.1.4 Surrounding area conditions

Equipment and protective systems shall be designed and constructed to adapt to the actual or foreseeable conditions of the surrounding area.

9.2.1.6 Instructions

9.2.1.6.1 All equipment and protective systems shall be accompanied by instructions, including at least the following details. […]