GB/T 3836.28-2021 English PDF (GBT3836.28-2021)

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GB/T 3836.28-2021: Explosive atmospheres -- Part 28: Non-electrical equipment for explosive atmospheres -- Basic method and requirements
GB/T 3836.28-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 29.260.20
CCS K 35
Replacing GB 25286.1-2010
Explosive atmospheres - Part 28: Non-electrical
equipment for explosive atmospheres - Basic method
and requirements
(ISO 80079-36:2016, Explosive atmospheres - Part 36: Non-electrical equipment
for explosive atmospheres - Basic method and requirements, MOD)
ISSUED ON: OCTOBER 11, 2021
IMPLEMENTED ON: MAY 01, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 4 
Introduction ... 9 
1 Scope ... 13 
2 Normative references ... 19 
3 Terms and definitions ... 20 
4 EPL and equipment groups ... 24 
4.1 EPL ... 24 
4.2 Group I equipment... 24 
4.3 Group II equipment... 25 
4.4 Group III equipment... 25 
4.5 Equipment for specific explosive gas atmospheres ... 26 
5 Ignition hazard assessment ... 26 
5.1 General requirements... 26 
5.2 Procedure of ignition hazard assessment ... 27 
6 Assessment of possible ignition sources and control means ... 30 
6.1 General ... 31 
6.2 Hot surfaces ... 31 
6.3 Flames and hot gases (including hot particles) ... 35 
6.4 Mechanically generated sparks and hot surfaces ... 35 
6.5 Electrical ignition sources except stray current ... 39 
6.6 Stray electric currents, cathodic corrosion protection ... 39 
6.7 Static electricity ... 39 
6.8 Adiabatic compression and shock waves ... 43 
6.9 Exothermic reactions, including self-ignition of dusts ... 43 
7 Additional considerations ... 44 
7.1 Dust deposits and other material in the gap of moving parts ... 44 
7.2 Dust deposits and other material in the flame arresters incorporated in the
equipment ... 44 
7.3 Opening times of enclosures ... 45 
7.4 Non-metallic enclosures and non-metallic parts of the equipment ... 45 
7.5 Removable parts ... 45 
7.6 Materials used for cementing ... 46 
7.7 Light transmitting parts ... 46 
7.8 Stored energy ... 46 
8 Verification and tests ... 46 
8.1 General ... 46 
8.2 Determination of the maximum surface temperature ... 47 
8.3 Mechanical tests... 50 
8.4 Additional tests of non-metallic parts of the equipment relevant for explosion
protection ... 51 
9 Documentation ... 54 
9.1 Technical documentation ... 54 
9.2 Conformity with the documentation ... 54 
9.3 Certificate ... 54 
9.4 Responsibility for marking ... 55 
10 Instructions ... 55 
11 Marking ... 56 
11.1 Location ... 56 
11.2 General ... 56 
11.3 Warning markings ... 58 
11.4 Marking on very small equipment ... 59 
11.5 Examples of marking ... 59 
Annex A (Normative) Protection concepts of types of protection "d", "p" and "t"
acceptable for non-electrical equipment ... 61 
Annex B (Informative) Explanation of the ignition hazard assessment procedure
... 62 
Annex C (Informative) Relationship between Equipment protection levels (EPLs)
and zones ... 68 
Annex D (Informative) Methodology for confirming the EPL ... 69 
Annex E (Informative) Consideration of misuse which can reasonably be
anticipated during ignition hazard assessment procedure ... 71 
Annex F (Informative) Examples of ignition hazard assessment... 73 
Annex G (Informative) Volume dependence of auto-ignition temperature ... 98 
Annex H (Informative) Development of different types of incendive electrostatic
discharges ... 100 
Bibliography ... 101 
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2020
"Directives for standardization - Part 1: Rules for the structure and drafting of
standardizing documents".
This Standard is Part 28 of GB/T 3836 "Explosive atmospheres". The following
parts of GB/T 3836 have been issued:
- Part 1: Equipment - General requirements;
- Part 2: Equipment protection by flameproof enclosures "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 hazardous areas;
- Part 15: Electrical installations design, selection and erection;
- Part 16: Inspection and maintenance of electrical installation (other than
mines);
- Part 17: Construction and use of rooms or building protected by
pressurization;
- Part 18: Intrinsically safe system;
- 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 assembly;
- Part 35: Classification of areas for explosive dust atmospheres.
This Standard replaces GB 25286.1-2010 "Non-electrical equipment for
potentially explosive atmospheres - Part 1: Basic method and requirements".
Compared with GB 25286.1-2010, in addition to structural adjustments and
editorial changes, the main technical changes in this Standard are as follows:
- changed the supplementary standards of this Standard (see Clause 1;
Clause 1 of GB 25286.1-2010);
- added the use of explosion-proof type "d", "p", "t" (see Clause 1 and Annex
A);
- added the applicability of corresponding clauses in GB/T 3836.1-2021 (see
Table 1);
- added the assessment and control methods for possible ignition sources
(see Clause 6);
- changed the requirements for verification and testing (see Clause 8; Clause
13 of GB 25286.1-2010);
- added the document requirements (see Clause 9);
- changed the requirements for marks (see Clause 11; Clause of GB
25286.1-2010).
This Standard uses redrafting method to modify and adopt ISO 80079-36:2016
"Explosive atmospheres - Part 36: Non-electrical equipment for explosive
atmospheres - Basic method and requirements".
Compared with ISO 80079-36:2016, the structural adjustments in this Standard
are as follows:
- Annex A corresponds to Annex G of ISO 80079-36:2016;
- Annex C corresponds to Annex I of I...