GB/T 3836.11-2022 PDF English
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| GB/T 3836.11-2022 | English | 905 |
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Explosive atmospheres - Part 11: Material characteristics for gas and vapour classification - Test methods and data
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| GB/T 3836.11-2017 | English | RFQ |
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Explosive atmospheres -- Part 11: Material characteristics for gas and vapour classification -- Test methods and data
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| GB 3836.11-2008 | English | 319 |
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[GB/T 3836.11-2008] Explosive atmospheres -- Part 11: Equipment protection by flameproof enclosures “d” -- Method of test for ascertainment of maximum experimental safe gap
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| GB 3836.11-1991 | English | 239 |
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Electrical apparatus for explosive atmospheres--Method of test for ascertainment of maximum experimental safe gap
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GB/T 3836.11-2022: Explosive atmospheres - Part 11: Material characteristics for gas and vapour classification - Test methods and data
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GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 29.260.20
CCS K 35
GB/T 3836.11-2022 / ISO/IEC 80079-20-1.2017
Replacing GB/T 3836.11-2017
Explosive atmospheres - Part 11.Material characteristics for
gas and vapour classification - Test methods and data
(ISO/IEC 80079-20-1.2017, Explosive atmospheres - Part 20-1.Material
characteristics for gas and vapour classification - Test methods and data, IDT)
Issued on. OCTOBER 12, 2022
Implemented on. MAY 01, 2023
Issued by. State Administration for Market Regulation;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword... 3
Introduction... 7
1 Scope... 10
2 Normative references... 10
3 Terms and definitions... 11
4 Classification of gases and vapours... 13
5 Data for flammable gases and vapours, relating to the use of equipment... 16
6 Method of test for the maximum experimental safe gap (MESG)... 18
7 Method of test for auto-ignition temperature (AIT)... 22
Annex A (normative) Ovens of test apparatus for the tests of auto-ignition temperature
... 31
Annex B (informative) Tabulated values... 38
Annex C (informative) Determination of cool flames... 92
Annex D (informative) Volume dependence of auto-ignition temperature... 94
Bibliography... 95
Foreword
This document 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 document is Part 11 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 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 hazardous areas
- 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 management systems for Ex Product manufacture
- Part 22.Protection of equipment and transmission system using optical radiation
- Part 23.Group Ⅰ, category EPL 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
- Part 36.Electrical safety devices for the control of potential ignition sources from
Ex Equipment.
This document replaces GB/T 3836.11-2017 "Explosive atmospheres - Part 11.
Material characteristics for gas and vapour classification - Test methods and data".
Compared with GB/T 3836.11-2017, in addition to the structural adjustments and
editorial changes, the main technical changes in this document are as follows.
- the range that needs to simultaneously determine the maximum test safety gap and
the minimum ignition current ratio is changed (see 4.2, 4.3 of this Edition, 4.4 of
Edition 2017);
- cases where classification should not be based on similarity in chemical structure
are added (see 4.4 of this Edition);
- the requirements for the short-circuit current of the ignition device and the
requirements for the spark discharge time are added (see 6.3.4 of this Edition);
- the requirements for the autoignition temperature test device are changed (see 7.2
of this Edition, 7.2 of Edition 2017);
- the sampling, preparation and storage requirements for auto-ignition temperature
test specimens are added (see 7.3 of this Edition);
- the procedures for auto-ignition temperature test are changed (see 7.4 of this
Edition, 7.3 of Edition 2017);
- the criterion for the validity of auto-ignition temperature test results is changed (see
7.6 of this Edition, 7.5 of Edition 2017);
- the requirements for test record data are changed (see 7.7 of this Edition, 7.6 of
Edition 2017).
This document identically adopts ISO/IEC 80079-20-1.2017 "Explosive atmospheres -
Part 20-1.Material characteristics for gas and vapour classification - Test methods and
data".
The following minimal editorial changes have been made to this document.
- to coordinate with existing standards, the name of the standard is changed to
"Explosive atmospheres - Part 11.Material characteristics for gas and vapour
classification - Test methods and data";
- the molecular formulas for substances with CAS numbers as 98-01-1, 100-40-3,
103-11-7, 106-58-1, 106-92-3, 108-89-4, 106-96-7, 111-43-3, 123- 63-7, 142-29-
0, 151-56-4, 291-64-5, 1738-25-6, 2426-08-6 are corrected;
- the description of X and Y in Figure D.1 is corrected;
- the technical corrigenda of ISO/IEC 80079-20-1.2017/COR1.2018 are
incorporated. The position of the outer margin of the clause involved is marked
with a vertical double line (ǁ);
- Bibliography is modified.
Attention is drawn to the possibility that some of the elements of this document may be
the subject of patent rights. The issuing authority shall not be held responsible for
identifying any or all such patent rights.
This document was proposed by China Electrical Equipment Industry Association.
This document shall be under the jurisdiction of National Technical Committee on
Explosion-proof Electrical Equipment of Standardization Administration of China
(SAC/TC 9).
The drafting organizations of this document. Nanyang Explosion-Proof Electric
Research Institute Co., Ltd., Harbin Institute of Technology, Shanghai Instrument and
Meter Automatic Control System Inspection and Testing Institute Co., Ltd., Henan
Emergency Management Science and Technology Research Institute, Xuzhou
Inspection and Testing Center, New Liming Technology Co., Ltd., Henan Shenma Aidi
An Chemical Co., Ltd.
Main drafters of this document. Zhang Gang, Liu Jian, Wang Qiaoli, Qian Song, Chen
Renshu, Yu Yanjuan, Zhang Peng, Zheng Zhenxiao, Sui Guohui, Sun Zhaojun, Lyu
Xiaodong, Fan Songkai.
Versions of standard substituted by this document are.
- GB/T 3836.11-1991 that was issued in 1991 for the first time. The first revision
was in 2008;
- GB/T 3836.11-2017 that was issued in 2017 for the second time. In the second
revision, the content of GB 3836.12-2008 was incorporated (the previous version
of GB 3836.12-2008 is GB 3836.12-1991);
- This is the third revision.
1 Scope
This document specifies the test methods and classification principles for determining
the maximum experimental safe gaps (MESG) of gas-air mixtures or vapour-air
mixtures under normal temperature and pressure conditions (20°C, 101.3kPa).
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-426
and the following apply.
classification system of equipment related to the explosive atmosphere for which they
are intended to be used
4 Classification of gases and vapours
Mixtures of gases should generally be allocated to an equipment group only after a
special determination of MESG or MICR ratio. One method to estimate the equipment
group is to determine the MESG of the mixture by applying a form of Le Châtelier’s
principle.
5 Data for flammable gases and vapours, relating to the use of equipment
Determinations have been made by a number of different methods, but the preferred
method is with a low energy ignition at the bottom of a vertical tube. The values (in
percentage by volume and mass per volume) are listed in Table B.1.
6 Method of test for the maximum experimental safe gap (MESG)
The apparatus is described in the following subclauses 6.2.1 ~ 6.2.7 and is shown
schematically in Figure 1.It is also possible to use an automatic set-up when it is proven
that the same results are obtained as with a manual apparatus.
7 Method of test for auto-ignition temperature (AIT)
The test vessel shall be a 200 mL narrow-necked Erlenmeyer flask made of borosilicate
glass according to ISO 1773.It shall be ensured that the inner surface of the bottom is
flat. A clean flask shall be used for tests.
Annex A
(normative)
Ovens of test apparatus for the tests of auto-ignition temperature
Ovens constructed in accordance with A.2 and A.3 are suitable for the tests described
in Clause 7.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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