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1、GOST R 51330.11-99 (IEC 60079-12-78) S T A T E S T A N D A R D O F T H E R U S S I A N F E D E R A T I O N EXPLOSIONPROOF ELECTRICAL APPARATUS Part 12 Classification of gas and vapor mixtures with air according to maximum experimental safe gaps and minimum igniting currents Official Edition GOSSTAND
2、ART OF RUSSIA Moscow ii GOST R 51330.11-99 Foreword 1 DEVELOPED by working group of specialists on explosionproof electrical apparatus of Certification Center “ and Testing Center of Manufactured Products - SUBMITTED by Technical Committee on Standardization C 403 “Explosionproof and mine electrical
3、 apparatus“ 2 APPROVED AND INTRODUCED by Decree No. 526-, dated 16.12.99, of Gosstandart of Russia 3 This Standard represents the authentic text of the international standard IEC 60079-12-78 “Explosionproof electrical apparatus. Part 12. Classification of gas and vapor mixtures with air according to
4、 maximum experimental safe gaps and minimum igniting currents“ with additional requirements specifying the needs of the national economy 4 INTRODUCED FOR THE FIRST TIME Introduction This Standard is included into a complex of the state standards for explosionproof electrical apparatus, developed by
5、Technical Committee on standardization TC 403 “Explosionproof and mine electrical apparatus“ on the basis of application of the international standards for explosionproof electrical apparatus. Along with the requirements of IEC 60079-12-78 this Standard contains the addenda, clarifying and (or) spec
6、ifying separate provisions of IEC 60079-12-78 taking into account the actual Russian practice. Specifically, Appendix A supplements tables 1 to 3 of IEC 60079-12-78 with explosive mixtures, classified according to the system, used in the Russian Federation industry. The additional requirements, refl
7、ecting the needs of the national economy, are italicized. Appendix B contains the distinguishing features of this Standard and international standard IEC 60079-12-78. The numbering of sections in this Standard is similar to IEC 60079-12-78. Standards Publishing House, 2000 This Standard may not be r
8、eproduced, in full or in part, reprinted or distributed as an official publication without the permission of Gosstandart of Russia II 1 GOST R 51330.11-99 (IEC 60079-12-78) S T A T E S T A N D A R D O F T H E R U S S I A N F E D E R A T I O N EXPLOSIONPROOF ELECTRICAL APPARATUS Part 12 Classificatio
9、n of gas and vapor mixtures with air according to maximum experimental safe gaps and minimum igniting currents Date of Introduction 2001-01-01 1 Scope This Standard establishes the classification of most frequently used explosive gas and vapor mixtures with air according to maximum experimental safe
10、 gaps (MESG) and minimum igniting currents (MIC). This Standard contains the instructions for the tests, which shall be carried out for classification of gases or vapors, not specified in this Standard, and for choosing of appropriate group or subgroup of electrical apparatus with explosion protecti
11、on of type explosionproof enclosure or intrinsically-safe circuit depending on gas or vapor, in whose medium it is used. 1.1 Normative references The references to the following standards are used in this Standard: GOST R 51330.2-99 (IEC 60079-1A-75) Explosionproof electrical apparatus. Part 1. Expl
12、osion protection of type explosionproof enclosure. Addendum 1. Appendix D. Method of determination the maximum experimental safe gap GOST R 51330.4-99 (IEC 60079-3-90) Explosionproof electrical apparatus. Part 3. Sparking mechanisms for testing of electrical circuits for intrinsic safety 2 Classific
13、ation of gases and vapors 2.1 Classification according to maximum experimental safe gaps (MESG) Gases and vapors for electrical apparatus with an explosion protection of type explosionproof enclosure shall be classified according to MESG. The method of MESG determination shall be in accordance with
14、GOST R 51 330.2. The results of MESG determination, carried out in spherical chamber of 8 dm3 in volume with igniting near the flange gap, may be used for preliminary classification. The groups of electrical apparatus (grades of explosive risk for gas or vapor) I - for using in underground mine open
15、ings (methane of underground openings*); II - for using in other branches of industry (gases and vapors, except for methane of underground openings). * Methane of underground openings is the mine gas, containing, besides methane, the gaseous hydrocarbons-homologues 2- C5 in amount not exceeding 0.1
16、volume fractions, and hydrogen in gas samples from bore holes right after the boring - no more than 0.002 volume fractions from total volume of combustible gases Official Edition 2 GOST R 51330.11-99 The following grades of explosive risk are established, depending on MESG, for gases and vapors (sub
17、groups of electrical apparatus of group II): II - MESG 0.9 mm; IIB - MESG more than 0.5 mm, but less than 0.9 mm; IIC - MESG 0.5 mm. N o t e - MESG shall be applied (or reduced to) at a temperature of 20 . 2.2 Classification according to minimum igniting currents (IC) Gases and vapors for electrical
18、 apparatus with explosion protection of type “intrinsically-safe circuit“ shall be classified according to a ratio of their minimum igniting currents to minimum igniting current of laboratory methane. The standard procedure of determination the MIC ratio shall be based on application of the equipmen
19、t specified in GOST R 51330.4. If the determination of MIC ratio is carried out with application of other equipment, then the results can be accepted only as the conditional ones (preliminary ones). Groups of electrical apparatus (grades of explosive risk for gas, vapor): I - for using in undergroun
20、d mine openings (methane of underground openings*); II - for using in other branches of industry (gases and vapors, except for methane of underground openings). The following grades of explosive risk for gases and vapors (subgroup of electrical apparatus of group II) are established depending on MIC
21、 ratio: IIA for MIC ratio more than 0.8; IIB for MIC ratio from 0.45 to 0.8 inclusive; II for MIC ratio less than 0.45. 2.3 Classification according to MESG and MIC For classification of the majority of gases and vapors it shall be enough to use only MESG or MIC ratio. The using of only one criterio
22、n shall be enough when: - MESG for grade IIA exceeds 0.9 mm or MIC ratio exceeds 0.9; - MESG for grade II is from 0.55 to 0.9 mm or MIC ratio is from 0.5 to 0.8; - MESG for grade IIC is less than 0.5 mm or MIC ratio is less than 0.45. It shall be necessary to determine both MESG and MIC ratios when
23、there are known only: - MIC ratios, and they are within the range of 0.8 to 0.9 (then the determination of MESG shall be necessary for classification of gas or vapor); - MIC ratios, and they are within the range of 0.45 to 0.5 (then the determination of MESG shall be necessary for classification of
24、gas or vapor); - MESG, and its value is within the range of 0.5 to 0.55 mm (then the determination of MIC ratios shall be necessary for classification of gas or vapor); 2.4 Classification according to similarity of chemical structure When gas or vapor is a member of some homologous series of compoun
25、ds, the grade of gas or vapor may be determined conditionally (previously) by results of classification of other members of these series with lesser molecular mass. It is necessary to be careful when using the results of such classification. 2.5 Classification of gas mixtures The classification of g
26、as mixtures, not specified in tables 1 to 3, shall be carried out only after special determination of MESG or MIC ratio. 3 Tables of gases The specified below classification of gases (vapors) allows to choose the group of electrical apparatus, which shall be applied in medium of certain gas-and-air
27、mixture in order to prevent its ignition. It is necessary to remember, that some of substances, specified in tables 1 to 3, for example ethyl nitrate, are rather unstable and are inclined to self-decomposition. The list of explosive mixtures in tables 1 to 3 is not exhausting. Appendix A contains an
28、 additional list of explosive mixtures, classified at national level and applied in industry of the Russian Federation. Tables 1 to 3 contain all isomers of compounds. 3 GOST R 51330.11-99 The letters in column “Classification method“ mean: a - is classified according to MESG; b - is classified acco
29、rding to MIC ratio; c - is classified both according to MESG and MIC ratio; d - is classified according to similarity of chemical structure (preliminary classification). Table 1-Explosive mixtures of grade IIA The substance generating an explosive mixture with air Chemical formula Classification met
30、hod 1 Hydrocarbons 1.1 A l k a n e s Methane* CH4 c Ethane C2H6 c Propane 38 c Bhutan C4H10 c Pentane C5H12 c Hexane C6H14 c Heptane C7H16 c Octane C8H18 a Nonane C9H20 d Decane C10H22 a Cyclobutane 2(2)22, d Cyclopentane 2(2)32, a Cyclohexane 2(2)42, c Cycloheptane 2(2)52, d Methyl cyclobutane 3(2)
31、22, d Methyl cyclopentane 3(2)32, d Methyl cyclohexane 3(2)42, d Ethyl cyclobutane 25(2)22, d Ethyl cyclopentane 25(2)32, d Eethyl cyclohexane 25(2)42, d Decahydronaphthalene 2(2)3CH (2)3CH2 d 1.2 A l k e n e s Propylene C2H4=CH4 a 1.3 A r o m a t i c h y d r o c a r b o n Styrene C6H5CH=CH2 b Isopr
32、opyl benzene (methylstyrene) C6H5C(CH3)=CH2 a 1.4 H yd r o c a r b o ns o f b e nz o l e s e r i e s Benzole 6 c Toluene C6H5CH3 d *ethane with minor amount of impurities (laboratory methane). -,-,- 4 GOST R 51330.11-99 Table 1 (cont.) The substance generating an explosive mixture with air Chemical
33、formula Classification method Xylol C6H4(CH3)2a Ethyl benzole C6H5C2H5 d Trimethylbenzole C6H3(CH3)3 d Naphthalene C10H8 d Cumene C6H5CH(CH3)2 d Cymol (3)2CH C6H4CH3 d 1.5 M i xe d hyd r o c a r b o ns - Industrial methane* - a (calculated) Turpentine - d Oil ligroin - d Carbonic ligroin - d Oil (in
34、cluding engine fuels) - d Oil solvent - d Fuel oil (furnace oil) - d Kerosene - d Solar oil - d Benzine - a 2 Oxygen-containing compounds 2.1 O xi d e s ( i nc l ud i ng e t he r s ) Carbon oxide* CO c Dipropyl ether (C3H7)2O a 2.2 Al c o ho l s a nd p he no l s Methanol CH3 c Ethanol C2H5OH c Propy
35、l alcohol C3H7OH c Butanol C4H9OH a Amyl alcohol C5H11OH a Hexyl alcohol C6H13OH a Heptyl alcohol C7H15OH d Octyl alcohol C8H17OH d Nonyl alcohol C9H19OH d Cyclohexanol 2(CH2)4CH OH d Methyl cyclohexanol 3CH(CH2)4CH OH d Phenol C6H5OH d Cresol 3C6H4OH d Diacetone alcohol (3)2(OH)2 3 d 2.3 Al d e hyd
36、 e s Acetic aldehyde 3 a Metaldehyde (3)n d 2.4 C e t o ne s Acetone (3)2 c Ethylmethylcetone C2H5CO 3 c Propylmethylcetone C3H7CO 3 a Butylmethylcetone C4H9CO 3 a Amylmethylcetone C5H11CO 3 d Acetylacetone 3 H2 3 a Cyclohexanone 2(CH2)4CO a 2.5 E t he r s Methyl formiate H 3 a Ethyl formiate H COO
37、C2H5 a Methyl acetate 3 3 c Ethyl acetate 3 C2H5 a * Methane (industrial) includes the mixtures of methane containing up to 15 % of hydrogen. * Carbonic oxide may include such amount of moisture, which is enough for saturation of the mixture “carbonic oxide- air” at standard environmental temperatur
38、e 5 GOST R 51330.11-99 Table 1 (cont.) The substance, generating an explosive mixture with air Chemical formula Classification method Propyl acetate 3 37a Butyl acetate 3 49 c Amyl acetate 3 511 d Methyl metacrylate CH2=C(3) 3 a Ethyl metacrylate CH2=C(3) 25 d Vinyl acetate CH3COOCH=CH2 a Ethyl acet
39、oacetate CH3COCH2COOC2H5 a 2.6 Ac i d s Acetic acid 3 b 3 Halogen-containing compounds 3.1 C o mp o und s wi t ho ut o xyge n Methyl chloride 3l a Ethyl chloride C2H5Cl b Ethyl bromide C2H5Br d Propyl chloride C3H7Cl a Butyl chloride C4H9Cl a Butyl bromide C4H9Br d Dichlorethane C2H4Cl2 a Dichlorpro
40、pane C3H6Cl2 d Chlorbenzole C6H5Cl d Chlorbenzyl C6H5CHCl d Dichlorbenzole C6H4Cl2 d Allyl chloride CH2=CHCH2Cl b Dichloroethylene CHCl=CHCl a Ethylene chloride CH2=CHCl c Benzotrifluoride C6H5CF3 a Dichloromethane CH2Cl2 d 3.2 C o mp o und s wi t h o xyge n Acetyl chloride 3l d Chloroethane alcohol
41、 CH2ClCH2OH d 4 Sulphur-containing compounds Ethyl mercaptan C2H5SH c Propyl mercaptan C3H7SH a (calculated) Thiophene CH=CH CH=CHS d Tetrahydrothiophene CH2(CH2)2CH2S a 5 Nitrogen-containing compounds Ammonia NH3 a Acetonitrile CH3CN a Ethyl nitrite CH3CH2ONO a Nitromethane CH2NO2 d Nitroethane C2H
42、5NO2 d 5.1 Ami ne s Methyl amine CH3NH2 a Diethylamine (CH3)2NH a Trimethylamine (3)3N a Diethylamine (C2H5)2NH d Triethylamine (C2H5)N d Propylamine C3H7NH2 d Butylamine C4H9NH2 c Cyclohexilamine CH2(CH2)4CHNH2 d Monoethanolamine NH2CH2CH2OH d 2-Diethylaminoethanol (C2H5)2NCH2CH20H d Diaminoethane
43、NH2CH2CH2NH2a Aniline C6H5NH2d NN-dimethyl aniline C6H5N(CH3)2 d Phenamine C6H5CH2CH(NH2)CH3 d Toluidine CH3C6H4NH2 d Pyridine C5H5N d -,-,- 6 GOST R 51330.11-99 Table 2 - Explosive mixtures of grade IIB The substance, generating an explosive mixture with air Chemical formula Classification method 1
44、 Hydrocarbons Allylene CH3C=CH b Ethylene C2H4 c Cyclopropane CH2CH2CH2 b 1,3-Butadien CH2=CHCH=CH2 c 2 Nitrogen-containing compounds Acrylonitrile CH2=CHCN c Isopropyl nitrate (CH3)2CHONO2 b Hydrogen cyanide HCN a 3 Oxygen-containing compounds Dimethyl ether (3)2 c Ethyl-methyl ether CH3OC2H5 d Die
45、thyl ether (C2H5)2O c Dibutyl ether (C4H9)2O c Ethylene oxide 22 c Propylene oxide 32 c 1,3-Dioxalane CH2CH2OCH2O d 1,4-Dioxane 2222O a 1,3,5-Trioxane 222 b Butyl glycole HOCH2COOC4H9 a Tetrahydrofurfuryl alcohol Methyl acrylate 2222 d Methyl acrylate CH2=CHCOOCH3 a Ethyl acrylate CH2=CHCOOC2H5 a Fu
46、ran aldehyde CH=CHCH=CHO a Croton aldehyde CH3CH=CHCHO a Acrolein CH2=CHCHO a (calculated) Tetrahydrofuran CH2(CH2)2CH2O a 4 Mixtures Coke-oven gas - d 5 Halogen-containing compounds Tetrafluoroethylene C2F4 a Ethyl chlorhydrin OCH2CHCH2Cl a Table 3-Explosive mixtures of grade IIC The substance, gen
47、erating an explosive mixture with air Chemical formula Classification method Hydrogen H2c Acetylene C2H2 c Carbon bisulphide CS2 c Ethyl nitrate C2H5ONO2 c -,-,- 7 GOST R 51330.11-99 APPENDIX A (reference) Additional list of explosive mixtures applied in industrial production of the Russian Federati
48、on Grade of explosive risk of a mixture The substance, generating an explosive mixture with air IIA Tertiary butyl chloride Vinyl chloride, vinylidene chloride, 2-vinylpyridine, 4-vinylpyridine Gas mixture (10 % of hydrogen + 90 % of argon), -hydrotetrafluorinethoxybenzole 1,1-dimethyl-5-hydroperfluorineamyl alcohol 3,4-dichlorbutene-1; 1,3- dichlorbutene-2; 1,2-dichlorpropane, dicyclopentadiene, t