GB/T 3836.30-2021 PDF in English
GB/T 3836.30-2021 (GB/T3836.30-2021, GBT 3836.30-2021, GBT3836.30-2021)
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Explosive atmospheres -- Part 30: Equipment and components in explosive atmospheres in underground mines
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Standards related to (historical): GB/T 3836.30-2021
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GB/T 3836.30-2021: PDF in English (GBT 3836.30-2021) GB/T 3836.30-2021
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 29.260.20
CCS K 35
Explosive Atmospheres - Part 30: Equipment and
Components in Explosive Atmospheres in Underground
Mines
(ISO/IEC 80079-38:2016, Explosive Atmospheres - Part 38: Equipment and
Components in Explosive Atmospheres in Underground Mines, MOD)
ISSUED ON: OCTOBER 11, 2021
IMPLEMENTED ON: MAY 1, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 4
Introduction ... 10
1 Scope ... 14
2 Normative References ... 15
3 Terms, Definitions and Abbreviations ... 16
4 Requirements for Equipment (machine) and Components ... 20
4.1 General Rules ... 20
4.2 Ignition Hazard Assessment ... 21
4.3 Non-electrical Equipment and Components ... 23
4.4 Electrical Equipment and Components ... 23
5 Additional Requirements for Specific Equipment and Components ... 28
5.1 Cutting and Stripping Equipment ... 28
5.2 Rope Haulages for Level and Inclined Transport ... 30
5.3 Fans ... 30
5.4 Internal Combustion Engines ... 32
5.5 Air Compressors ... 33
5.6 Drilling Equipment and Components ... 33
5.7 Brakes ... 33
5.8 Traction Batteries, Starter Batteries and Vehicle Lighting Batteries ... 34
5.9 Optical Fibers Used on Machines and Electromagnetic Radiation from Components on
Machines ... 35
5.10 Gas Monitoring Systems ... 36
6 Fire Protection ... 36
6.1 General ... 36
6.2 Non-metallic Materials ... 37
6.3 Hydraulic and Pneumatic Equipment ... 37
6.4 Requirements for Cable-reeled Equipment ... 39
6.5 Fire Prevention of Electric Cables as Part of the Machine ... 40
6.6 Conveyer Belt ... 40
7 Information for Use ... 41
7.1 Warnings ... 41
7.2 Instruction Manual ... 41
8 Marking ... 41
Appendix A (normative) Tests for Surface Protective Coating for Group I Hand Tools
of EPL Mb ... 43
Appendix B (informative) Guidance on Potential Risks for Converter-fed Motors ... 46
Appendix C (informative) Example of an Ignition Hazard Assessment for a Conveyor
Belt Intended for Use in a Coal Mine ... 47
Appendix D (informative) Example of an Ignition Hazard Assessment for a Shearer
Loader Intended for Use in a Potentially Explosive Atmosphere of a Coal Mine ... 52
Appendix E (normative) Ignition Sources ... 60
Bibliography ... 67
Foreword
This Document was drafted in accordance with the rules in GB/T 1.1-2020 Directives for
Standardization - Part 1: Rules for the Structure and Drafting of Standardizing Documents.
This Document is Part 30 of GB/T 3836 Explosive Atmospheres. GB/T 3836 has published the
following parts:
--- Part 1: Equipment - General Requirements;
--- Part 2: Equipment Protection by Flameproof Enclosure “d”;
--- Part 3: Equipment Protection by Increased Safety “e”;
--- Part 4: Equipment Protection by Intrinsic Safety “i”;
--- Part 5: Equipment Protection by Pressurized Enclosure “p”;
--- Part 6: Equipment Protection by Liquid Immersion “o”;
--- Part 7: Equipment Protection by Powder Filling “q”;
--- Part 8: Equipment Protection by Type of Protection “n”;
--- Part 9: Equipment Protection by Encapsulation “m”;
--- Part 11: Material Characteristics for Gas and Vapor Classification - Test Methods and
Data;
--- Part 12: Material Characteristics for Combustible Dusts - Test Methods;
--- Part 13: Equipment Repair, Overhaul, Reclamation and Modification;
--- Part 14: Classification of Areas - Explosive Gas Atmosphere;
--- Part 15: Electrical Installations Design, Selection and Erection;
--- Part 16: Electrical Installations Inspection and Maintenance;
--- Part 17: Equipment Protection by Pressurized Room “p” and Artificially Ventilated
Room “v”;
--- Part 18: Intrinsically Safe Electrical Systems;
--- Part 20: Equipment with Equipment Protection Level (EPL) Ga;
--- Part 21: Application of Quality Systems for Equipment Manufacture;
--- Part 22: Protection of Equipment and Transmission System Using Optical Radiation;
--- Part 23: Group I, Category EPL Ma Equipment Intended to Remain Functional in
Atmospheres Endangered by Firedamp and/or Coal Dust;
--- Part 24: Equipment Protection by Special Protection “s”;
--- Part 25: Requirements for Process Sealing between Flammable Process Fluids and
Electrical Systems;
--- Part 26: Electrostatic Hazards - Guidance;
--- Part 27: Electrostatic Hazards - Test;
--- Part 28: Non-Electrical Equipment for Explosive Atmospheres - Basic Method and
Requirements;
--- Part 29: Non-Electrical Equipment for Explosive Atmospheres - Constructional Safety
“c”, Control of Ignition Source “b”, Liquid Immersion “k”;
--- Part 30: Equipment and Components in Explosive Atmospheres in Underground Mines;
--- Part 31: Equipment Dust Ignition Protection by Enclosure “t”;
--- Part 32: Intrinsically Safe Systems with Electronically Controlled Spark Duration
Limitation;
--- Part 33: Equipment in Adverse Service Conditions;
--- Part 34: Equipment Assemblies;
--- Part 35: Classification of Areas for Explosive Dust Atmospheres.
This Document adopts the re-drafting method in the modification and adoption of ISO/IEC
80079-38:2016 Explosive Atmospheres - Part 38: Equipment and Components in Explosive
Atmospheres in Underground Mines.
This Document makes the following structural adjustments:
---Due to the deletion of the term 3.1 “Protection against Firedamp Explosions” in ISO/IEC
80079-38:2016, the sequence of other terms is adjusted;
---The sequence of appendixes is adjusted. The previous Appendix E is adjusted to
Appendix A; the previous Appendix D is adjusted to Appendix B; the previous
Appendix A is adjusted to Appendix C; the previous Appendix B is adjusted to
Appendix D; the previous Appendix C is adjusted to Appendix E.
In comparison with ISO/IEC 80079-38:2016, the technical differences and the causes for these
differences are as follows:
---In terms of Normative References, this Document makes adjustments with technical
differences to adapt to the technical conditions of China. The adjustments are
intensively reflected in Chapter 2 “Normative References”. See the specific
adjustments below:
GB/T 3685, which modifies and adopts international standard, is used to replace
ISO 340 (see 6.2);
GB/T 3836.1, which modifies and adopts international standard, is used to replace
IEC 60079-0 (see Chapter 1);
GB/T 3836.18, which modifies and adopts international standard, is used to
replace IEC 60079-25 (see 4.4.6.3);
GB/T 3836.28-2021, which modifies and adopts international standard, is used to
replace ISO 80079-36:2016 (see Chapter 1);
GB/T 3836.29-2021, which modifies and adopts international standard, is used to
replace ISO 80079-37:2016 (see 5.3.1.4);
GB/T 4208, which equivalently adopts international standard, is used to replace
IEC 60529 (see 5.3.2);
GB/T 5226.1, which equivalently adopts international standard, is used to replace
IEC 60204-1 (see 4.4.3.1);
GB 5226.3, which equivalently adopts international standard, is used to replace
IEC 60204-11 (see 4.4.3.1);
GB/T 8642, which modifies and adopts international standard, is used to replace
ISO 14916 (see A.2);
GB/T 9239.1, which equivalently adopts international standard, is used to replace
ISO 1940-1 (see 5.3.1.6);
GB/T 16855.1, which equivalently adopts international standard, is used to replace
ISO 13849-1 (see 5.1.1);
GB/T 18380.11, GB/T 18380.12 and GB/T 18380.13, which equivalently adopt
international standard, are used to replace IEC 60332-1 (all parts) (see 6.5);
GB 28526, which equivalently adopts international standard, is used to replace
IEC 62061 (see 5.1.1);
GB/T 31523.1, which modifies and adopts international standard, is used to
replace ISO 7010 (see 7.1);
GB/T 34560.5, which modifies and adopts international standard, is used to
replace ISO 630-5 (see 5.3.1.1);
SH/T 0785, which modifies and adopts international standard, is used to replace
ISO 14935 (see 6.3);
ISO 15029-2 is used to replace ISO/TS 15029-2 (see 6.3);
The reference of GB/T 13813 is added (see 5.3.1).
---The term “Protection against Firedamp Explosions”, which does not appear in the main
text, is deleted.
---The situation in 4.4.3.1 that the setting of the overload tripping device may be above the
nominal current of the motor is deleted. The original intension of deleting the content
is to loosen the range of overcurrent protection through temperature protection.
However, overload protection and temperature protection are two different types of
protection. Although overload will cause temperature rise, which may further trigger
the act of temperature protection. If the two types of protection cooperate with each
other, the setting will be difficult.
---In 4.4.3.1 “Overload Protection”, the requirement of complying with the relevant
conditions when the certificate No. is followed by the symbols “U” and “X” is added.
That is because the equipment with symbols “U” and “X” after the certificate No. has
special requirements for relevant conditions.
---In 4.4.3.2, the requirement that the short-circuit protection shall comply with the
requirements of the corresponding explosion-proof type is added to “Short-circuit
Protection”. That is because if the short-circuit protection is externally set, it will
involve the selection of explosion-proof type.
---4.4.3.3 “Electric Leakage Protection” is added to comply with China’s regulations on
underground equipment.
---In 5.1.2.2 “Water Spray Systems”, the installation of water spray systems and
monitoring of the minimum water pressure and / or minimum water flow are modified
into the installation of internal and external water spray systems and monitoring of the
minimum water pressure and water flow, so as to adapt to the current application of
domestic equipment and the on-site working conditions, and to ensure that the water
spray systems have the desired effect.
---In 5.2 “Rope Haulages for Level and Inclined Transport”, the number of laps of rope is
modified from at least 2.5 to at least 3 to facilitate the measurement.
---In 5.3.1.3 “Inlet and Outlet Cones”, the requirement that inlet cones shall be constructed
to a tolerance of 1.5 mm on diameter is deleted, because the tolerance of the inlet
cones has basically no effect on the product performance.
---In 5.3.1.4 “Impellers and Impeller Rings”, “impellers shall be able to withstand a test
run at a minimum of 1.15 times the maximum operational rotating speed for at least 60
seconds” is respectively modified into 1.1 times and 120 s to comply with the
stipulations of relevant Chinese standards.
---In 5.3.1.5 “Clearance”, the requirement that the clearance shall not be less than 1 mm
under any circumstance is added, so as to comply with the stipulations of GB/T 3836.1.
---In 5.3.1.8 “Materials”, Table 1 “Combination of Materials” is deleted; the requirement
for the materials used for the rubbing track and the impeller is modified from complying
with Table 1 into the usage of materials with the least ignition hazard from friction
sparks and qualified in the inspection. That is because Table 1 does not consider the
safety of the impeller impacted by foreign objects. If the matching materials for the
rubbing track and the impeller stipulated in Table 1 are used, it is equivalent to
loosening the application of aluminum alloys. Meanwhile, the requirement for the
clearance between the impeller and the casing is modified from not less than the value
provided in Table 1 to not less than 2.5 mm. That is because in China, coal mine fans
have such requirements for the clearance of extraction fans, and what is stipulated in
Table 1 is too small and unsafe, and also not easy to achieve,
---In 5.3.2 “Other Fans”, the ingress protection of the inlet and outlet of the fan is
respectively modified into IP20 and IP10 to be consistent with GB/T 3836.1.
---In 5.10 “Gas Monitoring Systems”, the requirement of complying with the relevant
regulations on the state mines is added to comply with China’s regulations on mines.
---In Appendix A, the test gas of the impact test is modified into the explosive mixture of
methane oxygen-enriched air, so as to comply with the stipulations of relevant Chinese
standards.
This Document makes the following editorial modifications:
---In order to maintain consistent with the current standard series, the title of the Document
is modified into Explosive Atmospheres - Part 30: Equipment and Components in
Explosive Atmospheres in Underground Mines;
---A NOTE regarding the situation of exceeding the range of the standard atmospheric
conditions is added to the Scope;
---A NOTE regarding Appendix B is added to 4.1;
---A suggestive NOTE regarding additional protective measures is added to 4.4.3.2;
---The NOTE regarding the international standard for internal combustion engines for
explosive atmospheres is deleted from 5.4;
---The reference standard in NOTE 2 of 5.4 is modified;
Explosive Atmospheres - Part 30: Equipment and
Components in Explosive Atmospheres in Underground
Mines
1 Scope
This Document specifies the explosion-proof requirements for the design, structure, evaluation
and usage information (maintenance, repair and marking) of equipment that can be used in
independent or combined operation.
It includes mining machinery and components for use in explosive atmospheres with methane
and / or combustible dust. The standard atmospheric conditions (related to the explosive
characteristics of the environment), under which, the equipment is assumed to operate, are as
follows:
---Temperature: 20 C ~ +60 C;
---Pressure: 80 kPa ~ 110 kPa;
---Normal oxygen content in the air: usually 21% (volume fraction).
NOTE: further additional consideration and testing may be required for electrical equipment used
in atmosphere conditions beyond this range.
This Document is applicable to Mb (EPL Mb) equipment and components used in explosive
atmospheres with methane and / or combustible dust.
For Ma (EPL Ma) 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, as well as comprehensive protective
measures, also need to be considered. These measures may include ventilation, firedamp
detection or firedamp extraction.
This Document also addresses the prevention of ignition in explosive atmospheres caused by
the burning (or smoldering) of flammable substances, such as: fabric fibers, plastic “O”-shaped
rings, rubber seals, lubricating oils or greases used in the equipment structure (if these materials
may be a source of ignition). For example, the mechanical failure of a rotating bearing may
cause the generation of heat by friction, ignite its plastic cover, plastic seal or lubricating grease.
The specific requirements and test procedures of fire protection of the conveyor belt are beyond
the scope of this Document.
2 Normative References
The contents of the following documents constitute indispensable clauses of this Document
through the normative references in the text. In terms of references with a specified date, only
versions with a specified date are applicable to this Document. In terms of references without
a specified date, the latest version (including all the modifications) is applicable to this
Document.
GB/T 3685 Conveyor Belts - Laboratory Scale Flammability Characteristics - Test Method
(GB/T 3685-2017, ISO 340:2013, MOD)
GB/T 3836.1 Explosive Atmospheres - Part 1: Equipment - General Requirements (GB/T
3836.1-2021, IEC 60079-0:2017, MOD)
GB/T 3836.18 Explosive Atmospheres - Part 18: Intrinsically Safe Electrical Systems (GB/T
3836.18-2017, IEC 60079-25:2010, MOD)
GB/T 3836.28-2021 Explosive Atmospheres - Part 28: Non-electrical Equipment for Explosive
Atmospheres - Basic Method and Requirements (ISO 80079-36:2016, MOD)
GB/T 3836.29-2021 Explosive Atmospheres - Part 29: Non-electrical Equipment for Explosive
Atmospheres - Constructional Safety “c”, Control of Ignition Source “b”, Liquid Immersion “k”
(ISO 80079-37:2016, MOD)
GB/T 4208 Degrees of Protection Provided by Enclosure (IP code) (GB/T 4208-2017, IEC
60529:2013, IDT)
GB/T 5226.1 Electrical Safety of Machinery - Electrical Equipment of Machines - Part 1:
General Requirements (GB/T 5226.1-2019, IEC 60204-1:2016, IDT)
GB 5226.3 Safety of Machinery - Electrical Equipment of Machines - Part 11: Requirements
for HV Equipment for Voltages above 1,000 Va.c. or 1,500 Vd.c. and Not Exceeding 36 kV
(GB 5226.3-2005, IEC 60204-11:2000, IDT)
GB/T 8642 Thermal Spraying - Determination of Tensile Adhesive Strength (GB/T 8642-2002,
ISO 14916:1999, MOD)
GB/T 9239.1 Mechanical Vibration - Balance Quality Requirements for Rotors in a Constant
(rigid) State - Part 1: Specification and Verification of Balance Tolerances (GB/T 9239.1-2006,
ISO 1940-1:2003, IDT)
GB/T 13813 Testing Method and Judging Rule of Safety to Friction Spark of Metallic Material
for Coal Mine
GB/T 16855.1 Safety of Machinery - Safety-related Parts of Control Systems - Part 1: General
Principles for Design (GB/T 16855.1-2018, ISO 13849-1:2015, IDT)
GB/T 18380.11 Tests on Electric and Optical Fiber Cables under Fire Conditions - Part 11: Test
for Vertical Flame Propagation for a Single Insulated Wire or Cable - Apparatus (GB/T
18380.11-2008, IEC 60332-1-1:2004, IDT)
GB/T 18380.12 Test on Electric and Optical Fiber Cables under Fire Conditions - Part 12: Test
for Vertical Flame Propagation for a Single Insulated Wire or Cable - Procedure for 1 kW Pre-
mixed Flame (GB/T 18380.12-2008, IEC 60332-1-2:2004, IDT)
GB/T 18380.13 Tests on Electric and Optical Fiber Cables under Fire Conditions - Part 13: Test
for Vertical Flame Propagation for a Single Insulated Wire or Cable - Procedure for
Determination of Flaming Droplets / Particles (GB/T 18380.13-2008, IEC 60332-1-3:2004,
IDT)
GB 28526 Electrical Safety of Machinery - Functional Safety of Safety-related Electrical,
Electronic and Programmable Electronic Control Systems (GB 28526-2012, IEC 62061:2005,
IDT)
GB/T 31523.1 Safety Information Identification Systems - Part 1: Signs (GB/T 31523.1-2015,
ISO 7010:2011, MOD)
GB/T 34560.5 Structural Steels - Part 5: Technical Delivery Condition for Atmospheric
Corrosion Resisting Steels (GB/T 34560.5-2017, ISO 630-5:2014, MOD)
SH/T 0785 Petroleum and Related Products - Determination of Wick Flame Persistence of Fire-
resistant Fluids (SH/T 0785-2006, ISO 14935-1998, MOD)
ISO 15029-1 Petroleum and Related Products - Determination of Spray Ignition Characteristics
of Fire-resistant Fluids - Part 1: Spray Flame Persistence - Hollow-cone Nozzle Method
ISO 15029-2 Petroleum and Related Products - Determination of Spray Ignition Characteristics
of Fire-resistant Fluids - Part 2: Spray Test - Stabilized Flame Heat Release Method
3 Terms, Definitions and Abbreviations
What is defined in GB/T 3836.1, and the following terms and definitions are applicable to this
Document.
3.1 Firedamp
Firedamp refers to a naturally occurring flammable gas mixture in mines.
NOTE: firedamp is mainly composed of methane, and in mining practice, the terms firedamp and
methane are often used as synonyms.
3.2 Flammable Substance
Flammable substance refers to a substance in gaseous, vapor, liquid and solid form, or a mixture
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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