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iec 61892-7 - pdf

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IEC 61892-7
Edition 2.0
2007-11
INTERNATIONAL
STANDARD
Mobile and fixed offshore units – Electrical installations –
Part 7: Hazardous areas
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 47.020.60
PRICE CODE
XA
ISBN 2-8318-9393-3
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–2–
61892-7 © IEC:2007(E)
CONTENTS
FOREWORD...........................................................................................................................6
INTRODUCTION.....................................................................................................................8
1
Scope ...............................................................................................................................9
2
Normative references .......................................................................................................9
3
Terms and definitions ..................................................................................................... 10
4
Area classification .......................................................................................................... 15
4.1
4.2
4.3
4.4
4.5
4.6
5
General ................................................................................................................. 15
Safety principles.................................................................................................... 16
Sources of release ................................................................................................ 16
Type of zone ......................................................................................................... 17
Relative density of the gas or vapour when it is released....................................... 17
Mobile drilling units ............................................................................................... 17
4.6.1 Zone 0 ....................................................................................................... 18
4.6.2 Zone 1 ....................................................................................................... 18
4.6.3 Zone 2 ....................................................................................................... 18
4.6.4 Well test facilities ...................................................................................... 18
4.7 Fixed production units ........................................................................................... 18
4.7.1 Zone 0 ....................................................................................................... 19
4.7.2 Zone 1 ....................................................................................................... 19
4.7.3 Zone 2 ....................................................................................................... 19
4.7.4 Drilling facilities ......................................................................................... 19
4.8 Mobile production units ......................................................................................... 19
4.9 Provisions regarding mobile and fixed offshore units ............................................. 20
4.10 Openings, access and ventilation conditions affecting the extent of
hazardous areas.................................................................................................... 20
4.10.1 General ..................................................................................................... 20
4.10.2 Enclosed space with direct access to any zone 1 location ......................... 20
4.10.3 Enclosed space with direct access to any zone 2 location ......................... 20
4.10.4 An enclosed space with direct access to any zone 1 location..................... 20
4.10.5 Notices ...................................................................................................... 21
Electrical systems .......................................................................................................... 21
5.1
5.2
5.3
5.4
5.5
5.6
Sources of electrical power ................................................................................... 21
Distribution systems .............................................................................................. 21
5.2.1 General ..................................................................................................... 21
5.2.2 Earth fault detection .................................................................................. 21
Electrical protection............................................................................................... 21
Emergency conditions due to drilling operations – Mobile drilling units .................. 22
Emergency switch-off – Ignition source control – Fixed production units ................ 22
Protection from dangerous sparking ...................................................................... 23
5.6.1 Dangers from live parts ............................................................................. 23
5.6.2 Dangers from exposed and extraneous conductive parts ........................... 23
5.6.3 Potential equalization ................................................................................ 24
5.6.4 Static electricity ......................................................................................... 24
5.6.5 Lightning protection ................................................................................... 24
5.6.6 Cathodically protected metallic parts ......................................................... 25
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61892-7 © IEC:2007(E)
6
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5.6.7 Electromagnetic radiation .......................................................................... 25
5.7 Danger from rotating parts..................................................................................... 25
Electrical equipment ....................................................................................................... 25
6.1
6.2
7
General ................................................................................................................. 25
Selection of electrical apparatus ............................................................................ 25
6.2.1 Selection with respect to area classification............................................... 25
6.2.2 Selection with respect to ignition temperature of the gas or vapour............ 25
6.2.3 Selection according to apparatus grouping ................................................ 26
6.2.4 External influences .................................................................................... 26
6.2.5 Ambient temperature ................................................................................. 27
6.3 Electrical apparatus in hazardous areas ................................................................ 27
6.3.1 Equipment for zone 0 ................................................................................ 27