GB/T 3836.2-2021 English PDF (GBT3836.2-2021)

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GB/T 3836.2-2021: Explosive atmospheres -- Part 2: Equipment protection by flameproof enclosures "d"
GB/T 3836.2-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 29.260.20
CCS K 35
Replacing GB 3836.2-2010
Explosive Atmospheres – Part 2: Equipment
Protection by Flameproof Enclosures “d”
(ISO 60079-1:2014, Explosive Atmospheres – Part 1: Equipment
Protection by Flameproof Enclosures “d”, MOD)
ISSUED ON: OCTOBER 11, 2021
IMPLEMENTED ON: MAY 01, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 4
Introduction ... 12
1 Scope ... 15
2 Normative References ... 15
3 Terms and Definitions ... 16
4 Level of Protection (Equipment Protection Level, EPL) ... 19
5 Flameproof Joints ... 21
6 Sealed Joints ... 34
7 Operating Rods ... 36
8 Supplementary Requirements for Shafts and Bearings ... 37
9 Light-Transmitting Parts ... 40
10 Breathing and Draining Devices which form Part of a Flameproof Enclosure
... 40
11 Fasteners and Openings ... 47
12 Materials ... 48
13 Entries for Flameproof Enclosures ... 50
14 Verification and Tests ... 55
15 Type Tests ... 55
16 Routine Tests ... 70
17 Switchgear for Group I ... 73
18 Lampholders and Lamp Caps ... 74
19 Non-Metallic Enclosures and Non-Metallic Parts of Enclosures ... 75
20 Marking ... 77
21 Instructions... 78
Annex A (Normative) Additional Requirements for Crimped Ribbon Elements
and Multiple Screen Elements of Breathing and Draining Devices ... 79
Annex B (Normative) Additional Requirements for Elements, with Non-
Measurable Paths of Breathing and Draining Devices ... 80
Annex C (Normative) Additional Requirements for Flameproof Entry Devices
... 83
Annex D (Normative) Empty Flameproof Enclosures as Ex Components ... 95
Annex E (Normative) Cells and Batteries Used in Flameproof “d” Enclosures
... 99
Annex F (Informative) Mechanical Properties for Screws and Nuts ... 105
Annex G (Normative) Additional Requirements for Flameproof Enclosures with
an Internal Source of Release (Containment System) ... 106
Annex H (Normative) Requirements for Machines with Flameproof “d”
Enclosures Fed from Converters ... 111
Annex I (Normative) Supplement Provisions of Group I Electrical Equipment
... 112
Annex J (Informative) Example of Supplemental Mechanical Means of Securing
the Cemented Joint ... 114
Bibliography ... 115
Foreword
This Document was drafted as per the rules specified in GB/T 1.1-2020 Directives for
Standardization – Part 1: Rules for the Structure and Drafting of Standardizing
Documents.
This Document is Part 2 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 Vapour 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 replaced GB 3836.2-2010 Explosive Atmospheres - Part 2: Equipment
Protection by Flameproof Enclosures “d”. Compared with GB 3836.2-2010, this
Document made the major technical changes besides the structural adjustments and
editorial modifications:
--- Delete the clause of equipment category and temperature group (see Clause 4
of 2010 Edition);
--- Add the Clause of protection level (see Clause 4 of this Edition);
--- Add special conditions of use that the flameproof joints are not expected to be
repaired (see 5.1 of this Edition);
---Add the requirements when the thickness of the metal coating exceeds 0.008mm
(see 5.1 of this Edition);
--- Add the requirements for multi-section joints (see 5.2.9 of this Edition);
--- Change the maximum gap value of the joint surface of Class-II A and Class-II B
enclosures with a volume greater than 2000cm3 (see Table 2 of this Edition; Table
1 of 2010 Edition);
--- Add the requirements for the supplementary mechanical fixing method of the
bonded joint surface (see 6.1.2 of this Edition);
--- Add the test requirements for bonded joint surface (see 6.1.2 of this Edition);
---Add the requirements for the joint surface of molten glass (see 6.2 of this Edition);
--- Change the type test sequence of breathing and draining devices used as Ex
components (see 10.9.3 of this Edition, 10.9.2 of 2010 Edition);
--- Change the requirements for the explosion-proof certificate of Ex component
breathing and draining devices (see 10.9.4 of this Edition; 10.9.3 of 2010 Edition);
--- Increase the requirements for openings on the shell wall except for the
introduction device (see 11.8 of this Edition);
--- Add the requirements for copper or copper alloy enclosures used in explosive
environments containing acetylene (see 12.8 of this Edition);
---Add the options of the requirements that the introduction device should meet (see
13.1 of this Edition);
--- Add the requirements for non-threaded holes for Class I equipment (see 13.3 of
this Edition);
--- Increase the requirements for plugs and sockets to maintain the flameproof
performance during the arc extinguishing period and the power factor
requirements of the test circuit (13.6.4 of this Edition);
--- Change the conditions for determining the maximum surface temperature (see
Table 6 of this Edition; Table 5 of 2010 Edition);
--- Cha...