GB/T 3836.30-2021 English PDF (GBT3836.30-2021)

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GB/T 3836.30-2021: Explosive atmospheres -- Part 30: Equipment and components in explosive atmospheres in underground mines
GB/T 3836.30-2021
Explosive atmospheres - Part 30.Equipment and components in explosive atmospheres in underground mines
ICS 29.260.20
CCSK35
National Standards of People's Republic of China
Explosive atmosphere part 30.underground mine
Equipment and components for explosive atmospheres
(ISO /IEC 80079-38.2016,Explosiveatmospheres-Part 38.Equipmentand
Released on 2021-10-11
2022-05-01 implementation
State Administration for Market Regulation
Issued by the National Standardization Management Committee
Table of contents
Foreword Ⅲ
Introduction Ⅳ
1 Scope 1
2 Normative references 1
3 Terms, definitions and abbreviations 2
4 Requirements for equipment (machines) and components 4
4.1 General 4
4.2 Ignition hazard assessment 5
4.3 Non-electrical equipment and components 6
4.4 Electrical equipment and components 6
5 Supplementary requirements for specific equipment and components 9
5.1 Cutting and peeling equipment 9
5.2 Towline for horizontal and inclined transportation 10
5.3 Ventilator 10
5.4 Internal combustion engine 11
5.5 Air compressor 12
5.6 Drilling equipment and components 12
5.7 Brake 12
5.8 Traction battery, starting battery and vehicle lighting battery 13
5.9 Electromagnetic radiation from optical fibers and machine components used in machines 13
5.10 Gas monitoring system 13
6 Fire protection 14
6.1 General 14
6.2 Non-metallic materials 14
6.3 Hydraulic and pneumatic equipment 14
6.4 Requirements for cable drums 15
6.5 Fire protection of cables that are part of the machine 16
6.6 Conveyor belt 16
7 Usage information 16
7.1 Warnings 16
7.2 Manual 16
8 Sign 17
Appendix A (Normative) Test of surface protective coating for class I Mb hand-held tools 18
Appendix B (Informative) Guide to Potential Hazards of Variable Frequency Motors 20
Appendix C (informative) Example of the ignition hazard assessment of conveyor belts for coal mine 21
Appendix D (Informative) Example of Ignition Hazard Assessment of Coal Shearers Used in Potentially Explosive Environments of Coal Mines 24
Appendix E (Normative) Ignition Source 30
Reference 34
Explosive atmosphere part 30.underground mine
Equipment and components for explosive atmospheres
1 Scope
This document specifies the explosion-proof design, structure, evaluation and use information (maintenance, repair, marking) of equipment that can be operated individually or in combination.
Require.
Including mining machinery and components used in explosive environments with methane and/or combustible dust. It is assumed that the equipment can run the standard
The quasi-atmospheric conditions (related to the explosive characteristics of the environment) are as follows.
---Temperature. -20℃~ 60℃;
---Pressure. 80kPa~110kPa;
---Normal oxygen content in the air. usually 21% (volume fraction).
Note. For electrical equipment used under atmospheric conditions beyond this range, additional considerations and tests may be required.
This document applies to Mb-class (EPLMb) equipment and components used in explosive environments containing methane and/or combustible dust.
For Ma-level (EPLMa) equipment and components, the requirements of this document, GB/T 3836.1 and GB/T 3836.28 apply.
External conditions that may have an impact on the hazard and comprehensive protection measures also need to be considered. These measures may include ventilation, gas detection or
Gas drainage.
This document also covers the materials used in the structure of the equipment, such as fabric fibers, plastic "O" rings, rubber seals, lubricating oil or grease, etc.
Combustion (or simmering) of flammable materials causes the prevention of ignition in explosive environments (if these materials may be the source of ignition). For example, rotating bearings
The mechanical failure of this product can cause friction and heat generation and ignite its plastic cover, plastic seal or lubricating grease.
The specific requirements and test procedures for fire protection of conveyor belts are not within the scope of this document.
2 Normative references
The content of the following documents constitutes an indispensable clause of this document through normative references in the text. Among them, dated quotations
Only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to
This document.
GB/T 3685 Laboratory-scale test method for combustion characteristics of conveyor belts (GB/T 3685-2017, ISO 340.2013,
MOD)
GB/T 3836.1 Explosive environment Part 1.General requirements for equipment (GB/T 3836.1-2021, IEC 60079-0.
2017, MOD)
GB/T 3836.18 Explosive Atmosphere Part 18.Intrinsically Safe Electrical System (GB/T 3836.18-2017, IEC 60079-
25.2010, MOD)
GB/T 3836.28-2021 Explosive atmosphere Part 28.Basic methods and requirements for non-electrical equipment used in explosive atmospheres
(ISO 80079-36.2016, MOD)
GB/T 3836.29-2021 Explosive Atmosphere Part 29.Non-electrical Equipment for Explosive Atmosphere Safety Type "c", Control
System ignition source type "b", liquid immersion type "k" (ISO 80079-37.2016, MOD)
GB/T 4208 Enclosure protection grade (IP code) (GB/T 4208-2017, IEC 60529.2013, IDT)
GB/T 5226.1 Electrical Safety of Machinery Electrical Equipment of Machinery Part 1.General Technical Conditions (GB/T 5226.1-2019,
IEC 60204-1.2016, IDT)
The different characteristics of the equipment and the protection level specified for the equipment.
Note. The equipment protection level can be selected as part of the overall risk assessment of a set of devices.
3.14
Ma level EPLMa
The equipment installed in the explosive environment of coal mine methane has a "high" protection level, which has sufficient safety to make the equipment
It is impossible to become a point in normal operation, expected failures or rare failures, or even when the equipment is still live when the gas suddenly appears
Burning source.
3.15
Mb level EPLMb
The equipment installed in the explosive environment of coal mine methane has a "high" protection level. This level has sufficient safety to make the equipment in
It is not possible to become a source of ignition under expected failure conditions that occur during normal operation or in the time between the sudden appearance of gas and the power failure of the equipment.
3.16
Maximum surface temperature
When working under the most unfavourable operating conditions (but within the approved tolerances), any part of the equipment, protection system or
The highest temperature the surface can reach that can ignite the surrounding explosive environment.
Note 1.The corresponding surface temperature can be the inner surface temperature or the outer surface temperature, depending on the type of explosion-proof.
Note 2.To avoid ignition, the maximum surface temperature should be lower than the ignition temperature of the explosive mixture.
Note 3.For Ex equipment used in an explosive dust environment, the temperature appears on the outer surface of the enclosure and may include the specified dust layer conditions.
3.17
Non-electrical equipment
A device that can mechanically realize its intended function.
Note. The equipment referred to in GB/T 3836.28-2021 may be driven by any type of energy.
3.18
Mechanicalsparks
Sparks or spark clusters between two similar or different solid materials due to impact or friction.
3.19
Ignition sparks incendivivesparks
There is enough heat to ignite mechanical sparks in a combustible environment.
3.20
Hydraulic fluids
In addition to water, liquids and their concentrates used for transmission and monitoring.
4 Requirements for equipment (machines) and components
4.1 General
The design and manufacture of all electrical/non-electrical equipment and components for potentially explosive atmospheres should be based on good engineering practices and comply with Mb
Class equipment requirements to ensure that there will be no ignition source. The instruction manual shall provide inspection and maintenance information in accordance with the requirements of 7.2.2 to maintain the equipment
Security situation.
Under some conditions, certain components or subsystems may need to be Ma-level (for example, methane detection/monitoring systems on machines).
Electrical equipment should meet the requirements of GB/T 3836.1 for Mb level, and non-electrical equipment should meet the requirements of GB/T 3836.28 for Mb level.
Require.
Note 1.When necessary, the manufacturer or its authorized agent, buyer and/or user may need to negotiate to determine any local use that affects the ignition hazard assessment
condition.
The following requirements apply to all machines and should be specially considered.
---It is necessary to limit the maximum surface temperature in accordance with 6.2 of GB/T 3836.28-2021.
---Need to meet the electrostatic requirements of 6.7 in GB/T 3836.28-2021.
---It is necessary to restrict the use of bare light metals in accordance with 6.4.4 of GB/T 3836.28-2021 and GB/T 3836.1.Handheld worker
The light alloy parts of the equipment should be protected by a protective coating, and should pass the test of Appendix A (impact test and adhesion in an explosive environment).
End test).
---It is necessary to test the non-metallic parts that play a role of anti-ignition protection to ensure that the quality will not be
Disable the protection (see also Chapter 6).
One of the following measures or a combination of these measures can be used to prevent the equipment from exceeding the maximum surface temperature.
---The continuous rating of the equipment makes it easy to adapt to the longest working cycle;
--- Appropriate short-term quota for equipment;
---Additional cooling system;
---Shutdown device for measuring the temperature of the surface or cooling system;
---Limit the energy transferred through the equipment, such as limiting the motor power current or releasing mechanical power.
If the surface temperature is not limited by continuous rating, the manufacturer should specify special use conditions in the user manual, such as equipment
The maximum oil temperature when the power is automatically disconnected.
Note 2.Welding, cutting, grinding, burning and other processes with open flames and/or open flames are usually prohibited in coal mines and other mines, and special
Except in the case of measures. Therefore, Mb-class equipment will be configured to install, disassemble, maintain or repair mechanical devices underground in gas mines, usually without
These crafts.
In addition to the requirements of non-metallic materials specified in GB/T 3836.1 and GB/T 3836.28-2021, if these materials can become a point
The source of combustion, the material should be a flame-retardant material (see 6.2).
Note 3.Appendix B gives guidance on potential hazards of variable frequency motors.
4.2 Ignition hazard assessment
4.2.1 Formal analysis
All equipment and all its components should be risk assessed in accordance with GB/T 3836.28-2021, and a formal risk assessment report should be formed.
Note. 4.2.2~4.2.6 are derived from GB/T 3836.28-2021 and are requirements for mining equipment.
4.2.2 Evaluation of Class I Mb Equipment
For Class I Mb equipment, the higher protection level that needs to be achieved should be considered when assessing, as well as during normal operation and expected failure or even severe operation.
Under operating conditions, especially harsh operating conditions caused by barbaric operation and changes in environmental conditions, Mb-class equipment should ensure safety requirements.
Out all effective or possibly effective ignition sources.
The equipment is designed to be powered off when an explosive environment occurs. In this case, the danger of becoming an effective ignition source still exists. Such ignition
The source should also be listed. The assessment shall describe the measures taken to reduce the possibility of ignition. These measures can comply with this document or GB/T 3836.28-
2021 requirements.
Note. One of the examples, the concentration of flammable gas in the atmosphere (for example, 20% LEL), is detected with a methane detector (Ma level), and the power supply of the device (Mb level) is automatically
resection.
The assessment should include measures to reduce the possibility of flame spread, for example, by eliminating or reducing fuel sources.
4.2.3 Determine the maximum surface temperature
As part of the ignition risk assessment, the maximum surface temperature of the equipment should be determined. This is regulated by GB/T 3836.28-2021 in 8.2
The maximum surface temperature of the equipment adjusted by a predetermined safety margin. The maximum surface temperature is suitable for equipment that can be exposed to a potentially explosive environment
Or it can form any part of the dust layer, taking into account the size of the surface and the ability to form an ignition source.
The assessment should also consider supporting devices used to limit the maximum surface temperature (for example, the use of low-melting fusible drainage in fluid couplings)
plug). If a temperature limiting device is used, it should meet the requirements of the control ignition source type "b" and the requirements of the most unfavorable operating conditions. Should be at the highest
Evaluate the maximum surface temperature at ambient temperature.
Under the most unfavorable working conditions of the equipment, the fault allowed by the equipment protection type shall be applied, and the maximum surface temperature shall be determined by measurement or calculation.
Spend. Measure or calculate to determine that the maximum surface temperature should include the expected fault operating conditions of Mb level.
The condition that the surface temperature will increase due to lack of cooling and heat dissipation after the machine is stopped should be considered.
For some equipment or equipment components, the most unfavorable working conditions may be continuous full-load operation, or may include severe overload
Maximum duty cycle.
Note. For the maximum surface temperature, see GB/T 3836.28-2021.
4.2.4 Dust and oth...