BS EN IEC 60079-10-1:2021 – TC

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Tracked Changes. Explosive atmospheres – Classification of areas. Explosive gas atmospheres

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BSI	2021	256

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Categories: 29.260.20 - Electrical apparatus for explosive atmospheres, BSI

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Description

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 °C (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.

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PDF Pages	PDF Title
1	compares BS EN IEC 60079-10-1:2021
2	TRACKED CHANGES Text example 1 — indicates added text (in green)
6	Endorsement notice
7	Annex ZA Normative references to international publications with their corresponding European publications
12	EXPLOSIVE ATMOSPHERES – FOREWORD
15	Explanations: B) Information about the background of changes
17	INTRODUCTION
18	EXPLOSIVE ATMOSPHERES – 1 Scope
19	2 Normative references 3 Terms and definitions 3.1 3.2 3.3 3.3.1
20	3.3.2 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
21	3.4.3 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
22	3.6.3 3.6.4 3.6.5 3.6.6 3.6.7 3.6.8 3.6.9 3.6.10 3.6.11
23	3.6.12 3.6.13 3.7 3.7.1 3.7.2 3.7.3 3.7.4
24	4 General 4.1 Safety principles 4.2 AreaHazardous area classification objectives
25	4.3 Interior of equipment containing flammable materials 4.34.4 Explosion risk assessment 4.4.1 General 4.4.2 Zone of negligible extent
26	4.5 Catastrophic failures 4.44.6 Competence of Personnelpersonnel
27	5 AreaHazardous area classification methodology 5.1 General
28	5.2 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
29	5.5 Combination of methods 6 Release of flammable substance 6.1 General 6.2 Sources of release
30	6.3 Forms of release 6.3.1 General
31	6.3.2 Gaseous release 6.3.3 Liquefied under pressure release
32	6.3.4 Liquefied by refrigeration release 6.3.5 AerosolsFlammable mists release 6.3.6 Vapours release 6.3.7 Liquid releasesrelease
33	6.47 Ventilation (or air movement) and dilution 7.1 General
34	6.57.2 Main types of ventilation 6.5.17.2.1 General 6.5.27.2.2 Natural ventilation 6.5.37.2.3 Artificial ventilation
35	6.5.3.37.2.3.3 Examples of artificial ventilation 6.5.47.2.4 Degree of dilution
36	Figure 1 – Dilution Volume
37	78 Type of zone 7.18.1 General 7.28.2 Influence of grade of the source of release 7.38.3 Influence of dilution
38	7.48.4 Influence of availability of ventilation 89 Extent of zone
39	910 Documentation 9.110.1 General 9.210.2 Drawings, data sheets and tables
41	Annex A Suggested presentation of hazardous areas A.1 Hazardous area zones – Preferred symbols for zones Figure A.1 – Preferred symbols for hazardous area zones
43	Table A.2 – Hazardous area classification data sheet – Part II: List of sources of release
44	A.2 Hazardous area suggested shapes Figure A.2 – Gas or vapour at low pressure (or at high pressure in case of unpredictable release direction)
45	Figure A.3 – Gas or vapour at high pressure
46	Figure A.4 – Liquefied gas
47	Figure A.5 – Flammable liquid (non boiling evaporative pool)
48	Annex B Estimation of sources of release B.1 Symbols B.2 Examples of grade of release B.2.1 General
49	B.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
50	B.4 Summation of releases B.5 Hole size and source radius
52	Table B.1 – Suggested hole cross sections for secondary grade of releases
53	B.6 Forms of release Figure B.1 – Forms of release
54	Figure B.1 – Forms of release
55	B.7 Release rate B.7.1 General B.7.2 Estimation of Release Raterelease rate
56	B.7.2.2 Release rate of liquids B.7.2.3 Release rate of gas or vapour
57	B.7.2.3.2 Release rate of gas with non choked gas velocity (subsonic releases)
58	B.7.2.3.3 Release rate of gas with choked gas velocity (sonic releases) B.7.3 Release rate of evaporative pools
61	Figure B.2 –Specific volumetric evaporation rate of liquids B.8 Release from openings in buildings B.8.1 General
62	B.8.2 Openings as possible sources of release B.8.3 Openings classification Type A Type B Type C Type D
63	Table B.2 – Effect of hazardous zones on openings as possible sources of release
64	Annex C Ventilation guidance C.1 Symbols C.2 General
65	C.3 Assessment of ventilation and dilution and its influence on hazardous area C.3.1 General
66	C.3.2 Effectiveness of ventilation C.3.3 Criteria for dilution C.3.4 Assessment of ventilation velocity
67	Table C.1 – Indicative outdoor ventilation velocities (uw)
68	Table C.1 – Indicative outdoor ventilation velocities (uw) C.3.5 Assessment of the degree of dilution
69	Figure C.1 – Chart for assessing the degree of dilution
70	C.3.6 Dilution in a room
71	C.3.6.2 Background concentration and releases in a ventilated room
72	C.3.7 Criteria for availability of ventilation C.3.7.2 Criteria for natural ventilation
73	C.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
74	Figure C.2 – Self diffusion of an unimpeded high velocity jet release C.4.3 Jet release in a small naturally ventilated building
75	C.4.4 Jet release in a small artificially ventilated building Figure C.3 – Supply only ventilation Figure C.4 – Supply and extraction ventilation
76	Figure C.4 – Supply and extraction ventilation C.4.5 Release with low velocity C.4.6 Fugitive emissions
77	C.4.7 Local ventilation-extraction C.5 Natural Ventilation in buildings C.5.1 General C.5.2 Wind induced ventilation
78	C.5.3 Buoyancy induced ventilation
80	Figure C.6 – Volumetric flow rate of fresh air per m2 of equivalent effective opening area
81	Figure C.6 –Specific volumetric flow rate of fresh air of equivalent effective opening area C.5.4 Combination of the natural ventilation induced by wind and buoyancy
82	Figure C.7 – Example of opposing ventilation driving forces
83	Annex D Estimation of hazardous zonesareas D.1 General D.2 Estimating types of the zones Table D.1 – Zones for grade of release and effectiveness of ventilation
84	D.3 Estimating the extent of the hazardous zonearea
85	Figure D.1 – Chart for estimating hazardous area distances
87	Annex E Examples of hazardous area classification E.1 General E.2 Examples Example No. 1
89	Figure E.1 – Degree of dilution (Example No. 1)
90	Figure E.2 – Hazardous distance (Example No. 1)
91	Figure E.3 – Zone classification (Example No. 1)
92	Example No. 2
93	Figure E.4 – Degree of dilution (Example No. 2)
94	Figure E.5 – Hazardous distance (Example No. 2) Example No. 3
96	Figure E.6Figure E.5 – Degree of dilution (Example No. 3)
97	Figure E.7Figure E.6 – Hazardous distance (Example No. 3)
98	Figure E.8Figure E.7– Zones classification (Example No. 3)
99	Example No. 4
100	Figure E.9Figure E.8 – Degree of dilution (Example No. 4)
101	Figure E.10Figure E.9– Hazardous distance (Example No. 4)
102	Figure E.11Figure E.10 – Zones classification (Example No. 4)
105	Figure E.12Figure E.11 – Degree of dilution (Example No. 5)
106	Figure E.13Figure E.12– Hazardous distance (Example No. 5)
107	E.3 Example case study for hazardous area classification
109	Figure E.14Figure E.13 – Enclosed compressor handling natural gas
114	Table E.2 – Hazardous area classification data sheet – Part I: Flammable substance list and characteristics
115	Table E.3 – Hazardous area classification data sheet – Part II: List of sources of release (1 of 2)
117	Figure E.15Figure E.14 – Example of hazardous area classification for a compressor facility handling natural gas (elevation)
119	Annex F Schematic approach to classification of hazardous areas F.1 Schematic approach to classification of hazardous areas Figure F.1 – Schematic approach to classification
120	F.2 Schematic approach to classification of hazardous areas
121	Figure F.2 – Schematic approach to classification for continuous grade releases
122	F.3 Schematic approach to classification of hazardous areas Figure F.3 – Schematic approach to classification for primary grade releases
123	Figure F.3 – Schematic approach to classification for primary grade releases
124	F.4 Schematic approach to classification of hazardous areas Figure F.4 – Schematic approach to classification for secondary grade releases
125	Figure F.4 – Schematic approach to classification for secondary grade releases
126	Annex G Flammable mists
128	Annex H Hydrogen
130	Annex 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
131	Annex J Useful equations in support to hazardous area classification J.1 General J.2 Dilution with air of a flammable substance release
132	J.3 Estimate of the time required to dilute a flammable substance release
133	Annex K Industry codes and national standards K.1 General
134	Table K.1 – Examples of codes and standards
135	Table K.1 – Examples of codes and standards
137	Bibliography
140	undefined
142	European foreword Endorsement notice
143	English CONTENTS
147	FOREWORD
151	INTRODUCTION
152	1 Scope 2 Normative references
153	3 Terms and definitions
157	4 General 4.1 Safety principles
158	4.2 Hazardous area classification objectives
159	4.3 Interior of equipment containing flammable materials 4.4 Explosion risk assessment 4.4.1 General 4.4.2 Zone of negligible extent
160	4.5 Catastrophic failures 4.6 Competence of personnel 5 Hazardous area classification methodology 5.1 General
161	5.2 Classification by sources of release method
162	5.3 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
163	6 Release of flammable substance 6.1 General 6.2 Sources of release
164	6.3 Forms of release 6.3.1 General
165	6.3.2 Gaseous release 6.3.3 Liquefied under pressure release 6.3.4 Liquefied by refrigeration release
166	6.3.5 Flammable mists release 6.3.6 Vapours release 6.3.7 Liquid release
167	7 Ventilation (or air movement) and dilution 7.1 General
168	7.2 Main types of ventilation 7.2.1 General 7.2.2 Natural ventilation 7.2.3 Artificial ventilation
170	7.2.4 Degree of dilution Figures Figure 1 – Dilution Volume
171	8 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
172	9 Extent of zone 10 Documentation 10.1 General
173	10.2 Drawings, data sheets and tables
174	Annex A (informative)Suggested presentation of hazardous areas A.1 Hazardous area – Preferred symbols for zones Figure A.1 – Preferred symbols for zones
175	Tables Table A.1 – Hazardous area classification data sheet – Part I: Flammable substance list and characteristics
176	Table A.2 – Hazardous area classification data sheet – Part II: List of sources of release
177	A.2 Hazardous area suggested shapes Figure A.2 – Gas or vapour at low pressure(or at high pressure in case of unpredictable release direction) Figure A.3 – Gas or vapour at high pressure
178	Figure A.4 – Liquefied gas Figure A.5 – Flammable liquid (non boiling evaporative pool)
179	Annex B (informative)Estimation of sources of release B.1 Symbols B.2 Examples of grade of release B.2.1 General
180	B.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
181	B.4 Summation of releases
182	B.5 Hole size and source radius
183	Table B.1 – Suggested hole cross sections for secondary grade of releases
184	B.6 Forms of release Figure B.1 – Forms of release
185	B.7 Release rate B.7.1 General
186	B.7.2 Estimation of release rate
188	B.7.3 Release rate of evaporative pools
190	B.8 Release from openings in buildings B.8.1 General Figure B.2 – Specific volumetric evaporation rate of liquids
191	B.8.2 Openings as possible sources of release B.8.3 Openings classification
192	Table B.2 – Effect of zones on openingsas possible sources of release
193	Annex C (informative)Ventilation guidance C.1 Symbols
194	C.2 General C.3 Assessment of ventilation and dilution and its influence on hazardous area C.3.1 General
195	C.3.2 Effectiveness of ventilation C.3.3 Criteria for dilution
196	C.3.4 Assessment of ventilation velocity
197	C.3.5 Assessment of the degree of dilution Table C.1 – Indicative outdoor ventilation velocities (uw)
198	Figure C.1 – Chart for assessing the degree of dilution
199	C.3.6 Dilution in a room
200	C.3.7 Criteria for availability of ventilation
201	C.4 Examples of ventilation arrangements and assessments C.4.1 Introduction
202	C.4.2 Jet release in a large building Figure C.2 – Self diffusion of an unimpeded high velocity jet release
203	C.4.3 Jet release in a small naturally ventilated building C.4.4 Jet release in a small artificially ventilated building Figure C.3 – Supply only ventilation
204	C.4.5 Release with low velocity C.4.6 Fugitive emissions Figure C.4 – Supply and extraction ventilation
205	C.4.7 Local ventilation-extraction C.5 Natural Ventilation in buildings C.5.1 General C.5.2 Wind induced ventilation Figure C.5 – Local extraction ventilation
206	C.5.3 Buoyancy induced ventilation
208	C.5.4 Combination of the natural ventilation induced by wind and buoyancy Figure C.6 – Specific volumetric flow rate of fresh air of equivalent effective opening area
209	Figure C.7 – Example of opposing ventilation driving forces
210	Annex D (informative)Estimation of hazardous areas D.1 General D.2 Estimating types of the zones Table D.1 – Zones for grade of release and effectiveness of ventilation
211	D.3 Estimating the extent of the hazardous area
212	Figure D.1 – Chart for estimating hazardous area distances
213	Annex E (informative)Examples of hazardous area classification E.1 General E.2 Examples
214	Figure E.1 – Degree of dilution (Example No. 1)
215	Figure E.2 – Hazardous distance (Example No. 1) Figure E.3 – Zone classification (Example No. 1)
217	Figure E.4 – Degree of dilution (Example No. 2)
219	Figure E.5 – Degree of dilution (Example No. 3)
220	Figure E.6 – Hazardous distance (Example No. 3) Figure E.7 – Zones classification (Example No. 3)
222	Figure E.8 – Degree of dilution (Example No. 4)
223	Figure E.9 – Hazardous distance (Example No. 4)
224	Figure E.10 – Zones classification (Example No. 4)
226	Figure E.11 – Degree of dilution (Example No. 5)
227	Figure E.12 – Hazardous distance (Example No. 5)
229	Figure E.13 – Enclosed compressor handling natural gas Table E.1 – Compressor facility handling natural gas
232	Table E.2 – Hazardous area classification data sheet – Part I: Flammable substance list and characteristics
233	Table E.3 – Hazardous area classification data sheet – Part II: List of sources of release (1 of 2)
235	Figure E.14 – Example of hazardous area classification for a compressor facility handling natural gas (elevation)
236	Figure E.15 – Example of hazardous area classification for a compressor facility handling natural gas (plan)
237	Annex F (informative)Schematic approach to classification of hazardous areas Figure F.1 – Schematic approach to classification
238	Figure F.2 – Schematic approach to classification for continuous grade releases
239	Figure F.3 – Schematic approach to classification for primary grade releases
240	Figure F.4 – Schematic approach to classification for secondary grade releases
241	Annex G (informative)Flammable mists
244	Annex H (informative)Hydrogen
246	Annex 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
247	Annex 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
249	Annex K (informative)Industry codes and national standards K.1 General
250	Table K.1 – Examples of codes and standards
253	Bibliography

Additional information

Status	Definitive
Pages	256
Publication Date	2021-04-19
ISBN	978 0 539 17593 6
Standard Number	BS EN IEC 60079-10-1:2021 – TC
Title	Tracked Changes. Explosive atmospheres – Classification of areas. Explosive gas atmospheres
Descriptors	Chemical properties, Fire tests, Vapours, Selection, Protected electrical equipment, Flammable atmospheres, Electrical equipment, Electric current, Safety measures, Gases, Flammability, Hazards, Classification systems, Flash point, Explosive atmospheres, Temperature, Ignition, Data
Publisher	BSI
Committee	EXL/31/3
ICS Codes	29.260.20 - Electrical apparatus for explosive atmospheres

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