GB/T 3836.30-2021Explosive atmospheres - Part 30: Equipment and components in explosive atmospheres in underground mines (English PDF)

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;

---The NOTE in 5.10 is modified;

---GB/T 3836.2, flameproof and intrinsically safe type is added to the evaluation of

electrical equipment in C.4;

---The Bibliography is modified.

Please be noted that certain content of this Document may involve patents. The institution

issuing this Document does not undertake the responsibility of identifying these patents.

This Document was proposed by China Electrical Equipment Industry Association.

This Document shall be under the jurisdiction of National Technical Committee 9 on Explosion-

proof Electrical Equipment of Standardization Administration of China (SAC/TC 9).

The drafting organizations of this Document. Nanyang Explosion-proof Electrical Research

Institute Co., Ltd.; China Energy Investment Co., Ltd.; China Energy Group Ningxia Coal Co.,

Ltd.; North China University of Technology; CCTEG Chongqing Research Institute; Wolong

Electric Nanyang Explosion Protection Group Co., Ltd.; CCTEG Shenyang Research Institute;

CCTEG Changzhou Research Institute; Hanwei Technology Group Co., Ltd.

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.

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.

3 Terms, Definitions and Abbreviations

What is defined in GB/T 3836.1, and the following terms and definitions are applicable to this

Document.

4 Requirements for Equipment (machine) and Components

All equipment and all its components shall be subject to hazard assessment in accordance with

GB/T 3836.28-2021, and a formal hazard assessment report shall be formed.

The ignition capability of the ignition sources shall be compared with the ignition

characteristics of flammable substances.

5 Additional Requirements for Specific Equipment and Components

Stripping machines, for example, ploughs, shall have an interlock. Before the water spray

system operates, the interlock shall prevent it from starting. The location of the water spray

system may be located on or above the stripping head, or applied to specific parts of the mining

working surface.

6 Fire Protection

For machines equipped with cable reels, cable reels and flexible cables form part of the machine.

This type of machines shall comply with the following requirements.

7 Information for Use

In addition to the markings required in Chapter 8, the manufacturer shall state the equipment

category and EPL, as well as the following information.

The manufacturer shall state the following information.

8 Marking

Non-electrical equipment that complies with the supplementary requirements of GB/T 3836.28-

2021 in this Document shall be marked in accordance with GB/T 3836.28-2021.There are no

supplementary requirements for the adopted explosion-proof type.

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