{"id":373444,"date":"2024-10-20T02:34:06","date_gmt":"2024-10-20T02:34:06","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/bs-en-iec-60079-10-12021-tc\/"},"modified":"2024-10-26T04:31:11","modified_gmt":"2024-10-26T04:31:11","slug":"bs-en-iec-60079-10-12021-tc","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/bsi\/bs-en-iec-60079-10-12021-tc\/","title":{"rendered":"BS EN IEC 60079-10-1:2021 – TC"},"content":{"rendered":"

IEC 60079-10-1:2020 is concerned with the classification of areas where flammable gas or vapour hazards may arise and may then be used as a basis to support the proper design, construction, operation and maintenance of equipment for use in hazardous areas. It is intended to be applied where there may be an ignition hazard due to the presence of flammable gas or vapour, mixed with air, but it does not apply to: a) mines susceptible to firedamp; b) the processing and manufacture of explosives; c) catastrophic failures or rare malfunctions which are beyond the concept of normality dealt with in this standard; d) rooms used for medical purposes; e) domestic premises; f) where a hazard may arise due to the presence of combustible dusts or combustible flyings but the principles may be used in assessment of a hybrid mixture. Flammable mists may form or be present at the same time as flammable vapour. In such case the strict application of the details in this document may not be appropriate. Flammable mists may also form when liquids not considered to be a hazard due to the high flash point are released under pressure. In these cases the classifications and details given in this document do not apply. For the purpose of this document, an area is a three-dimensional region or space. Atmospheric conditions include variations above and below reference levels of 101,3 kPa (1 013 mbar) and 20 \u00b0C (293 K), provided that the variations have a negligible effect on the explosion properties of the flammable substances. In any site, irrespective of size, there may be numerous sources of ignition apart from those associated with equipment. Appropriate precautions will be necessary to ensure safety in this context. This standard is applicable with judgement for other ignition sources but in some applications other safeguards may also need to be considered. E.g. larger distances may apply for naked flames when considering hot work permits. This document does not take into account the consequences of ignition of an explosive atmosphere except where a zone is so small that if ignition did occur it would have negligible consequences. This third edition of IEC 60079-10-1 cancels and replaces the second edition, published in 2015, and constitutes a technical revision, see foreword for further details.<\/p>\n

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PDF Pages<\/th>\nPDF Title<\/th>\n<\/tr>\n
1<\/td>\ncompares BS EN IEC 60079-10-1:2021 <\/td>\n<\/tr>\n
2<\/td>\nTRACKED CHANGES
Text example 1 \u2014 indicates added text (in green) <\/td>\n<\/tr>\n
6<\/td>\nEndorsement notice <\/td>\n<\/tr>\n
7<\/td>\nAnnex ZA
Normative references to international publications
with their corresponding European publications <\/td>\n<\/tr>\n
12<\/td>\nEXPLOSIVE ATMOSPHERES \u2013
FOREWORD <\/td>\n<\/tr>\n
15<\/td>\nExplanations:
B) Information about the background of changes <\/td>\n<\/tr>\n
17<\/td>\nINTRODUCTION <\/td>\n<\/tr>\n
18<\/td>\nEXPLOSIVE ATMOSPHERES \u2013
1 Scope <\/td>\n<\/tr>\n
19<\/td>\n2 Normative references
3 Terms and definitions
3.1
3.2
3.3
3.3.1 <\/td>\n<\/tr>\n
20<\/td>\n3.3.2
3.3.3
3.3.4
3.3.5
3.3.6
3.3.7
3.3.8
3.4
3.4.1
3.4.2 <\/td>\n<\/tr>\n
21<\/td>\n3.4.3
3.4.4
3.4.5
3.5
3.5.1
3.5.2
3.5.3
3.5.4
3.5.5
3.6
3.6.1
3.6.2 <\/td>\n<\/tr>\n
22<\/td>\n3.6.3
3.6.4
3.6.5
3.6.6
3.6.7
3.6.8
3.6.9
3.6.10
3.6.11 <\/td>\n<\/tr>\n
23<\/td>\n3.6.12
3.6.13
3.7
3.7.1
3.7.2
3.7.3
3.7.4 <\/td>\n<\/tr>\n
24<\/td>\n4 General
4.1 Safety principles
4.2 AreaHazardous area classification objectives <\/td>\n<\/tr>\n
25<\/td>\n4.3 Interior of equipment containing flammable materials
4.34.4 Explosion risk assessment
4.4.1 General
4.4.2 Zone of negligible extent <\/td>\n<\/tr>\n
26<\/td>\n4.5 Catastrophic failures
4.44.6 Competence of Personnelpersonnel <\/td>\n<\/tr>\n
27<\/td>\n5 AreaHazardous area classification methodology
5.1 General <\/td>\n<\/tr>\n
28<\/td>\n5.2 Classification by sources of release method
5.3 Use of industry codes and national standards
5.3.1 General
5.3.2 Fuel gas installations
5.4 Simplified methods <\/td>\n<\/tr>\n
29<\/td>\n5.5 Combination of methods
6 Release of flammable substance
6.1 General
6.2 Sources of release <\/td>\n<\/tr>\n
30<\/td>\n6.3 Forms of release
6.3.1 General <\/td>\n<\/tr>\n
31<\/td>\n6.3.2 Gaseous release
6.3.3 Liquefied under pressure release <\/td>\n<\/tr>\n
32<\/td>\n6.3.4 Liquefied by refrigeration release
6.3.5 AerosolsFlammable mists release
6.3.6 Vapours release
6.3.7 Liquid releasesrelease <\/td>\n<\/tr>\n
33<\/td>\n6.47 Ventilation (or air movement) and dilution
7.1 General <\/td>\n<\/tr>\n
34<\/td>\n6.57.2 Main types of ventilation
6.5.17.2.1 General
6.5.27.2.2 Natural ventilation
6.5.37.2.3 Artificial ventilation <\/td>\n<\/tr>\n
35<\/td>\n6.5.3.37.2.3.3 Examples of artificial ventilation
6.5.47.2.4 Degree of dilution <\/td>\n<\/tr>\n
36<\/td>\nFigure 1 \u2013 Dilution Volume <\/td>\n<\/tr>\n
37<\/td>\n78 Type of zone
7.18.1 General
7.28.2 Influence of grade of the source of release
7.38.3 Influence of dilution <\/td>\n<\/tr>\n
38<\/td>\n7.48.4 Influence of availability of ventilation
89 Extent of zone <\/td>\n<\/tr>\n
39<\/td>\n910 Documentation
9.110.1 General
9.210.2 Drawings, data sheets and tables <\/td>\n<\/tr>\n
41<\/td>\nAnnex A
Suggested presentation of hazardous areas
A.1 Hazardous area zones \u2013 Preferred symbols for zones
Figure A.1 \u2013 Preferred symbols for hazardous area zones <\/td>\n<\/tr>\n
43<\/td>\nTable A.2 \u2013 Hazardous area classification data sheet \u2013 Part II: List of sources of release <\/td>\n<\/tr>\n
44<\/td>\nA.2 Hazardous area suggested shapes
Figure A.2 \u2013 Gas or vapour at low pressure (or at high pressure in case of unpredictable release direction) <\/td>\n<\/tr>\n
45<\/td>\nFigure A.3 \u2013 Gas or vapour at high pressure <\/td>\n<\/tr>\n
46<\/td>\nFigure A.4 \u2013 Liquefied gas <\/td>\n<\/tr>\n
47<\/td>\nFigure A.5 \u2013 Flammable liquid (non boiling evaporative pool) <\/td>\n<\/tr>\n
48<\/td>\nAnnex B
Estimation of sources of release
B.1 Symbols
B.2 Examples of grade of release
B.2.1 General <\/td>\n<\/tr>\n
49<\/td>\nB.2.2 Sources giving a continuous grade of release
B.2.3 Sources giving a primary grade of release
B.2.4 Sources giving a secondary grade of release
B.3 Assessment of grades of release <\/td>\n<\/tr>\n
50<\/td>\nB.4 Summation of releases
B.5 Hole size and source radius <\/td>\n<\/tr>\n
52<\/td>\nTable B.1 \u2013 Suggested hole cross sections for secondary grade of releases <\/td>\n<\/tr>\n
53<\/td>\nB.6 Forms of release
Figure B.1 \u2013 Forms of release <\/td>\n<\/tr>\n
54<\/td>\nFigure B.1 \u2013 Forms of release <\/td>\n<\/tr>\n
55<\/td>\nB.7 Release rate
B.7.1 General
B.7.2 Estimation of Release Raterelease rate <\/td>\n<\/tr>\n
56<\/td>\nB.7.2.2 Release rate of liquids
B.7.2.3 Release rate of gas or vapour <\/td>\n<\/tr>\n
57<\/td>\nB.7.2.3.2 Release rate of gas with non choked gas velocity (subsonic releases) <\/td>\n<\/tr>\n
58<\/td>\nB.7.2.3.3 Release rate of gas with choked gas velocity (sonic releases)
B.7.3 Release rate of evaporative pools <\/td>\n<\/tr>\n
61<\/td>\nFigure B.2 \u2013Specific volumetric evaporation rate of liquids
B.8 Release from openings in buildings
B.8.1 General <\/td>\n<\/tr>\n
62<\/td>\nB.8.2 Openings as possible sources of release
B.8.3 Openings classification
Type A
Type B
Type C
Type D <\/td>\n<\/tr>\n
63<\/td>\nTable B.2 \u2013 Effect of hazardous zones on openings as possible sources of release <\/td>\n<\/tr>\n
64<\/td>\nAnnex C
Ventilation guidance
C.1 Symbols
C.2 General <\/td>\n<\/tr>\n
65<\/td>\nC.3 Assessment of ventilation and dilution and its influence on hazardous area
C.3.1 General <\/td>\n<\/tr>\n
66<\/td>\nC.3.2 Effectiveness of ventilation
C.3.3 Criteria for dilution
C.3.4 Assessment of ventilation velocity <\/td>\n<\/tr>\n
67<\/td>\nTable C.1 \u2013 Indicative outdoor ventilation velocities (uw) <\/td>\n<\/tr>\n
68<\/td>\nTable C.1 \u2013 Indicative outdoor ventilation velocities (uw)
C.3.5 Assessment of the degree of dilution <\/td>\n<\/tr>\n
69<\/td>\nFigure C.1 \u2013 Chart for assessing the degree of dilution <\/td>\n<\/tr>\n
70<\/td>\nC.3.6 Dilution in a room <\/td>\n<\/tr>\n
71<\/td>\nC.3.6.2 Background concentration and releases in a ventilated room <\/td>\n<\/tr>\n
72<\/td>\nC.3.7 Criteria for availability of ventilation
C.3.7.2 Criteria for natural ventilation <\/td>\n<\/tr>\n
73<\/td>\nC.3.7.3 Criteria for artificial ventilation
C.4 Examples of ventilation arrangements and assessments
C.4.1 Introduction
C.4.2 Jet release in a large building <\/td>\n<\/tr>\n
74<\/td>\nFigure C.2 \u2013 Self diffusion of an unimpeded high velocity jet release
C.4.3 Jet release in a small naturally ventilated building <\/td>\n<\/tr>\n
75<\/td>\nC.4.4 Jet release in a small artificially ventilated building
Figure C.3 \u2013 Supply only ventilation
Figure C.4 \u2013 Supply and extraction ventilation <\/td>\n<\/tr>\n
76<\/td>\nFigure C.4 \u2013 Supply and extraction ventilation
C.4.5 Release with low velocity
C.4.6 Fugitive emissions <\/td>\n<\/tr>\n
77<\/td>\nC.4.7 Local ventilation-extraction
C.5 Natural Ventilation in buildings
C.5.1 General
C.5.2 Wind induced ventilation <\/td>\n<\/tr>\n
78<\/td>\nC.5.3 Buoyancy induced ventilation <\/td>\n<\/tr>\n
80<\/td>\nFigure C.6 \u2013 Volumetric flow rate of fresh air per m2 of equivalent effective opening area <\/td>\n<\/tr>\n
81<\/td>\nFigure C.6 \u2013Specific volumetric flow rate of fresh air of equivalent effective opening area
C.5.4 Combination of the natural ventilation induced by wind and buoyancy <\/td>\n<\/tr>\n
82<\/td>\nFigure C.7 \u2013 Example of opposing ventilation driving forces <\/td>\n<\/tr>\n
83<\/td>\nAnnex D
Estimation of hazardous zonesareas
D.1 General
D.2 Estimating types of the zones
Table D.1 \u2013 Zones for grade of release and effectiveness of ventilation <\/td>\n<\/tr>\n
84<\/td>\nD.3 Estimating the extent of the hazardous zonearea <\/td>\n<\/tr>\n
85<\/td>\nFigure D.1 \u2013 Chart for estimating hazardous area distances <\/td>\n<\/tr>\n
87<\/td>\nAnnex E
Examples of hazardous area classification
E.1 General
E.2 Examples
Example No. 1 <\/td>\n<\/tr>\n
89<\/td>\nFigure E.1 \u2013 Degree of dilution (Example No. 1) <\/td>\n<\/tr>\n
90<\/td>\nFigure E.2 \u2013 Hazardous distance (Example No. 1) <\/td>\n<\/tr>\n
91<\/td>\nFigure E.3 \u2013 Zone classification (Example No. 1) <\/td>\n<\/tr>\n
92<\/td>\nExample No. 2 <\/td>\n<\/tr>\n
93<\/td>\nFigure E.4 \u2013 Degree of dilution (Example No. 2) <\/td>\n<\/tr>\n
94<\/td>\nFigure E.5 \u2013 Hazardous distance (Example No. 2)
Example No. 3 <\/td>\n<\/tr>\n
96<\/td>\nFigure E.6Figure E.5 \u2013 Degree of dilution (Example No. 3) <\/td>\n<\/tr>\n
97<\/td>\nFigure E.7Figure E.6 \u2013 Hazardous distance (Example No. 3) <\/td>\n<\/tr>\n
98<\/td>\nFigure E.8Figure E.7\u2013 Zones classification (Example No. 3) <\/td>\n<\/tr>\n
99<\/td>\nExample No. 4 <\/td>\n<\/tr>\n
100<\/td>\nFigure E.9Figure E.8 \u2013 Degree of dilution (Example No. 4) <\/td>\n<\/tr>\n
101<\/td>\nFigure E.10Figure E.9\u2013 Hazardous distance (Example No. 4) <\/td>\n<\/tr>\n
102<\/td>\nFigure E.11Figure E.10 \u2013 Zones classification (Example No. 4) <\/td>\n<\/tr>\n
105<\/td>\nFigure E.12Figure E.11 \u2013 Degree of dilution (Example No. 5) <\/td>\n<\/tr>\n
106<\/td>\nFigure E.13Figure E.12\u2013 Hazardous distance (Example No. 5) <\/td>\n<\/tr>\n
107<\/td>\nE.3 Example case study for hazardous area classification <\/td>\n<\/tr>\n
109<\/td>\nFigure E.14Figure E.13 \u2013 Enclosed compressor handling natural gas <\/td>\n<\/tr>\n
114<\/td>\nTable E.2 \u2013 Hazardous area classification data sheet \u2013 Part I: Flammable substance list and characteristics <\/td>\n<\/tr>\n
115<\/td>\nTable E.3 \u2013 Hazardous area classification data sheet \u2013 Part II: List of sources of release (1 of 2) <\/td>\n<\/tr>\n
117<\/td>\nFigure E.15Figure E.14 \u2013 Example of hazardous area classification for a compressor facility handling natural gas (elevation) <\/td>\n<\/tr>\n
119<\/td>\nAnnex F
Schematic approach to classification of hazardous areas
F.1 Schematic approach to classification of hazardous areas
Figure F.1 \u2013 Schematic approach to classification <\/td>\n<\/tr>\n
120<\/td>\nF.2 Schematic approach to classification of hazardous areas <\/td>\n<\/tr>\n
121<\/td>\nFigure F.2 \u2013 Schematic approach to classification for continuous grade releases <\/td>\n<\/tr>\n
122<\/td>\nF.3 Schematic approach to classification of hazardous areas
Figure F.3 \u2013 Schematic approach to classification for primary grade releases <\/td>\n<\/tr>\n
123<\/td>\nFigure F.3 \u2013 Schematic approach to classification for primary grade releases <\/td>\n<\/tr>\n
124<\/td>\nF.4 Schematic approach to classification of hazardous areas
Figure F.4 \u2013 Schematic approach to classification for secondary grade releases <\/td>\n<\/tr>\n
125<\/td>\nFigure F.4 \u2013 Schematic approach to classification for secondary grade releases <\/td>\n<\/tr>\n
126<\/td>\nAnnex G
Flammable mists <\/td>\n<\/tr>\n
128<\/td>\nAnnex H
Hydrogen <\/td>\n<\/tr>\n
130<\/td>\nAnnex I
Hybrid mixtures
I.1 General
I.2 Use of ventilation
I.3 Concentration limits
I.4 Chemical reactions
I.5 Energy\/Temperaturetemperature limits
I.6 Zoning requirements <\/td>\n<\/tr>\n
131<\/td>\nAnnex J
Useful equations in support to hazardous area classification
J.1 General
J.2 Dilution with air of a flammable substance release <\/td>\n<\/tr>\n
132<\/td>\nJ.3 Estimate of the time required to dilute a flammable substance release <\/td>\n<\/tr>\n
133<\/td>\nAnnex K
Industry codes and national standards
K.1 General <\/td>\n<\/tr>\n
134<\/td>\nTable K.1 \u2013 Examples of codes and standards <\/td>\n<\/tr>\n
135<\/td>\nTable K.1 \u2013 Examples of codes and standards <\/td>\n<\/tr>\n
137<\/td>\nBibliography <\/td>\n<\/tr>\n
140<\/td>\nundefined <\/td>\n<\/tr>\n
142<\/td>\nEuropean foreword
Endorsement notice <\/td>\n<\/tr>\n
143<\/td>\nEnglish
CONTENTS <\/td>\n<\/tr>\n
147<\/td>\nFOREWORD <\/td>\n<\/tr>\n
151<\/td>\nINTRODUCTION <\/td>\n<\/tr>\n
152<\/td>\n1 Scope
2 Normative references <\/td>\n<\/tr>\n
153<\/td>\n3 Terms and definitions <\/td>\n<\/tr>\n
157<\/td>\n4 General
4.1 Safety principles <\/td>\n<\/tr>\n
158<\/td>\n4.2 Hazardous area classification objectives <\/td>\n<\/tr>\n
159<\/td>\n4.3 Interior of equipment containing flammable materials
4.4 Explosion risk assessment
4.4.1 General
4.4.2 Zone of negligible extent <\/td>\n<\/tr>\n
160<\/td>\n4.5 Catastrophic failures
4.6 Competence of personnel
5 Hazardous area classification methodology
5.1 General <\/td>\n<\/tr>\n
161<\/td>\n5.2 Classification by sources of release method <\/td>\n<\/tr>\n
162<\/td>\n5.3 Use of industry codes and national standards
5.3.1 General
5.3.2 Fuel gas installations
5.4 Simplified methods
5.5 Combination of methods <\/td>\n<\/tr>\n
163<\/td>\n6 Release of flammable substance
6.1 General
6.2 Sources of release <\/td>\n<\/tr>\n
164<\/td>\n6.3 Forms of release
6.3.1 General <\/td>\n<\/tr>\n
165<\/td>\n6.3.2 Gaseous release
6.3.3 Liquefied under pressure release
6.3.4 Liquefied by refrigeration release <\/td>\n<\/tr>\n
166<\/td>\n6.3.5 Flammable mists release
6.3.6 Vapours release
6.3.7 Liquid release <\/td>\n<\/tr>\n
167<\/td>\n7 Ventilation (or air movement) and dilution
7.1 General <\/td>\n<\/tr>\n
168<\/td>\n7.2 Main types of ventilation
7.2.1 General
7.2.2 Natural ventilation
7.2.3 Artificial ventilation <\/td>\n<\/tr>\n
170<\/td>\n7.2.4 Degree of dilution
Figures
Figure 1 \u2013 Dilution Volume <\/td>\n<\/tr>\n
171<\/td>\n8 Type of zone
8.1 General
8.2 Influence of grade of the source of release
8.3 Influence of dilution
8.4 Influence of availability of ventilation <\/td>\n<\/tr>\n
172<\/td>\n9 Extent of zone
10 Documentation
10.1 General <\/td>\n<\/tr>\n
173<\/td>\n10.2 Drawings, data sheets and tables <\/td>\n<\/tr>\n
174<\/td>\nAnnex A (informative)Suggested presentation of hazardous areas
A.1 Hazardous area \u2013 Preferred symbols for zones
Figure A.1 \u2013 Preferred symbols for zones <\/td>\n<\/tr>\n
175<\/td>\nTables
Table A.1 \u2013 Hazardous area classification data sheet \u2013 Part I: Flammable substance list and characteristics <\/td>\n<\/tr>\n
176<\/td>\nTable A.2 \u2013 Hazardous area classification data sheet \u2013 Part II: List of sources of release <\/td>\n<\/tr>\n
177<\/td>\nA.2 Hazardous area suggested shapes
Figure A.2 \u2013 Gas or vapour at low pressure(or at high pressure in case of unpredictable release direction)
Figure A.3 \u2013 Gas or vapour at high pressure <\/td>\n<\/tr>\n
178<\/td>\nFigure A.4 \u2013 Liquefied gas
Figure A.5 \u2013 Flammable liquid (non boiling evaporative pool) <\/td>\n<\/tr>\n
179<\/td>\nAnnex B (informative)Estimation of sources of release
B.1 Symbols
B.2 Examples of grade of release
B.2.1 General <\/td>\n<\/tr>\n
180<\/td>\nB.2.2 Sources giving a continuous grade of release
B.2.3 Sources giving a primary grade of release
B.2.4 Sources giving a secondary grade of release
B.3 Assessment of grades of release <\/td>\n<\/tr>\n
181<\/td>\nB.4 Summation of releases <\/td>\n<\/tr>\n
182<\/td>\nB.5 Hole size and source radius <\/td>\n<\/tr>\n
183<\/td>\nTable B.1 \u2013 Suggested hole cross sections for secondary grade of releases <\/td>\n<\/tr>\n
184<\/td>\nB.6 Forms of release
Figure B.1 \u2013 Forms of release <\/td>\n<\/tr>\n
185<\/td>\nB.7 Release rate
B.7.1 General <\/td>\n<\/tr>\n
186<\/td>\nB.7.2 Estimation of release rate <\/td>\n<\/tr>\n
188<\/td>\nB.7.3 Release rate of evaporative pools <\/td>\n<\/tr>\n
190<\/td>\nB.8 Release from openings in buildings
B.8.1 General
Figure B.2 \u2013 Specific volumetric evaporation rate of liquids <\/td>\n<\/tr>\n
191<\/td>\nB.8.2 Openings as possible sources of release
B.8.3 Openings classification <\/td>\n<\/tr>\n
192<\/td>\nTable B.2 \u2013 Effect of zones on openingsas possible sources of release <\/td>\n<\/tr>\n
193<\/td>\nAnnex C (informative)Ventilation guidance
C.1 Symbols <\/td>\n<\/tr>\n
194<\/td>\nC.2 General
C.3 Assessment of ventilation and dilution and its influence on hazardous area
C.3.1 General <\/td>\n<\/tr>\n
195<\/td>\nC.3.2 Effectiveness of ventilation
C.3.3 Criteria for dilution <\/td>\n<\/tr>\n
196<\/td>\nC.3.4 Assessment of ventilation velocity <\/td>\n<\/tr>\n
197<\/td>\nC.3.5 Assessment of the degree of dilution
Table C.1 \u2013 Indicative outdoor ventilation velocities (uw) <\/td>\n<\/tr>\n
198<\/td>\nFigure C.1 \u2013 Chart for assessing the degree of dilution <\/td>\n<\/tr>\n
199<\/td>\nC.3.6 Dilution in a room <\/td>\n<\/tr>\n
200<\/td>\nC.3.7 Criteria for availability of ventilation <\/td>\n<\/tr>\n
201<\/td>\nC.4 Examples of ventilation arrangements and assessments
C.4.1 Introduction <\/td>\n<\/tr>\n
202<\/td>\nC.4.2 Jet release in a large building
Figure C.2 \u2013 Self diffusion of an unimpeded high velocity jet release <\/td>\n<\/tr>\n
203<\/td>\nC.4.3 Jet release in a small naturally ventilated building
C.4.4 Jet release in a small artificially ventilated building
Figure C.3 \u2013 Supply only ventilation <\/td>\n<\/tr>\n
204<\/td>\nC.4.5 Release with low velocity
C.4.6 Fugitive emissions
Figure C.4 \u2013 Supply and extraction ventilation <\/td>\n<\/tr>\n
205<\/td>\nC.4.7 Local ventilation-extraction
C.5 Natural Ventilation in buildings
C.5.1 General
C.5.2 Wind induced ventilation
Figure C.5 \u2013 Local extraction ventilation <\/td>\n<\/tr>\n
206<\/td>\nC.5.3 Buoyancy induced ventilation <\/td>\n<\/tr>\n
208<\/td>\nC.5.4 Combination of the natural ventilation induced by wind and buoyancy
Figure C.6 \u2013 Specific volumetric flow rate of fresh air of equivalent effective opening area <\/td>\n<\/tr>\n
209<\/td>\nFigure C.7 \u2013 Example of opposing ventilation driving forces <\/td>\n<\/tr>\n
210<\/td>\nAnnex D (informative)Estimation of hazardous areas
D.1 General
D.2 Estimating types of the zones
Table D.1 \u2013 Zones for grade of release and effectiveness of ventilation <\/td>\n<\/tr>\n
211<\/td>\nD.3 Estimating the extent of the hazardous area <\/td>\n<\/tr>\n
212<\/td>\nFigure D.1 \u2013 Chart for estimating hazardous area distances <\/td>\n<\/tr>\n
213<\/td>\nAnnex E (informative)Examples of hazardous area classification
E.1 General
E.2 Examples <\/td>\n<\/tr>\n
214<\/td>\nFigure E.1 \u2013 Degree of dilution (Example No. 1) <\/td>\n<\/tr>\n
215<\/td>\nFigure E.2 \u2013 Hazardous distance (Example No. 1)
Figure E.3 \u2013 Zone classification (Example No. 1) <\/td>\n<\/tr>\n
217<\/td>\nFigure E.4 \u2013 Degree of dilution (Example No. 2) <\/td>\n<\/tr>\n
219<\/td>\nFigure E.5 \u2013 Degree of dilution (Example No. 3) <\/td>\n<\/tr>\n
220<\/td>\nFigure E.6 \u2013 Hazardous distance (Example No. 3)
Figure E.7 \u2013 Zones classification (Example No. 3) <\/td>\n<\/tr>\n
222<\/td>\nFigure E.8 \u2013 Degree of dilution (Example No. 4) <\/td>\n<\/tr>\n
223<\/td>\nFigure E.9 \u2013 Hazardous distance (Example No. 4) <\/td>\n<\/tr>\n
224<\/td>\nFigure E.10 \u2013 Zones classification (Example No. 4) <\/td>\n<\/tr>\n
226<\/td>\nFigure E.11 \u2013 Degree of dilution (Example No. 5) <\/td>\n<\/tr>\n
227<\/td>\nFigure E.12 \u2013 Hazardous distance (Example No. 5) <\/td>\n<\/tr>\n
229<\/td>\nFigure E.13 \u2013 Enclosed compressor handling natural gas
Table E.1 \u2013 Compressor facility handling natural gas <\/td>\n<\/tr>\n
232<\/td>\nTable E.2 \u2013 Hazardous area classification data sheet \u2013 Part I: Flammable substance list and characteristics <\/td>\n<\/tr>\n
233<\/td>\nTable E.3 \u2013 Hazardous area classification data sheet \u2013 Part II: List of sources of release (1 of 2) <\/td>\n<\/tr>\n
235<\/td>\nFigure E.14 \u2013 Example of hazardous area classification for a compressor facility handling natural gas (elevation) <\/td>\n<\/tr>\n
236<\/td>\nFigure E.15 \u2013 Example of hazardous area classification for a compressor facility handling natural gas (plan) <\/td>\n<\/tr>\n
237<\/td>\nAnnex F (informative)Schematic approach to classification of hazardous areas
Figure F.1 \u2013 Schematic approach to classification <\/td>\n<\/tr>\n
238<\/td>\nFigure F.2 \u2013 Schematic approach to classification for continuous grade releases <\/td>\n<\/tr>\n
239<\/td>\nFigure F.3 \u2013 Schematic approach to classification for primary grade releases <\/td>\n<\/tr>\n
240<\/td>\nFigure F.4 \u2013 Schematic approach to classification for secondary grade releases <\/td>\n<\/tr>\n
241<\/td>\nAnnex G (informative)Flammable mists <\/td>\n<\/tr>\n
244<\/td>\nAnnex H (informative)Hydrogen <\/td>\n<\/tr>\n
246<\/td>\nAnnex I (informative)Hybrid mixtures
I.1 General
I.2 Use of ventilation
I.3 Concentration limits
I.4 Chemical reactions
I.5 Energy\/temperature limits
I.6 Zoning requirements <\/td>\n<\/tr>\n
247<\/td>\nAnnex J (informative)Useful equations in support tohazardous area classification
J.1 General
J.2 Dilution with air of a flammable substance release
J.3 Estimate of the time required to dilute a flammable substance release <\/td>\n<\/tr>\n
249<\/td>\nAnnex K (informative)Industry codes and national standards
K.1 General <\/td>\n<\/tr>\n
250<\/td>\nTable K.1 \u2013 Examples of codes and standards <\/td>\n<\/tr>\n
253<\/td>\nBibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

Tracked Changes. Explosive atmospheres – Classification of areas. Explosive gas atmospheres<\/b><\/p>\n\n\n\n\n
Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
BSI<\/b><\/a><\/td>\n2021<\/td>\n256<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":373448,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[551,2641],"product_tag":[],"class_list":{"0":"post-373444","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-29-260-20","7":"product_cat-bsi","9":"first","10":"instock","11":"sold-individually","12":"shipping-taxable","13":"purchasable","14":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/373444","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/373448"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=373444"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=373444"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=373444"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}