IEC 60079-13:2017

Explosive atmospheres - Part 13: Equipment protection by pressurized room "p" and artificially ventilated room "v"

IEC 60079-13:2017 gives requirements for the design, construction, assessment, verification and marking of rooms used to protect internal equipment:
– located in a Zone 1 or Zone 2 or Zone 21 or Zone 22 explosive atmosphere without an internal source of gas/vapour release and protected by pressurization;
– located in a Zone 2 explosive atmosphere with or without an internal source of gas/vapour release and protected by artificial ventilation;
– located in a non-hazardous area, containing an internal source of gas/vapour release and protected by artificial ventilation;
– located in a Zone 1 or Zone 2 or Zone 21 or Zone 22 explosive atmosphere containing an internal source of gas/vapour release and protected by both pressurization and artificial ventilation.
The term "room" used in this document includes single rooms, multiple rooms, a complete building or a room contained within a building. A room is intended to facilitate the entry of personnel and includes inlet and outlet ducts. An acoustic hood and other like enclosures designed to permit the entry of personnel can be considered as a room.
This document also includes requirements related safety devices and controls necessary to ensure that artificial ventilation, purging and pressurization is established and maintained.
A room assembled or constructed on site, can be either on land or off-shore. The room is primarily intended for installation by an end-user but could be constructed and assessed at a manufacturer’s facility, where the final construction such as ducting can be completed on site.
This document does not specify the methods that may be required to ensure adequate air quality for personnel with regard to toxicity and temperature within the room. National or other regulations and requirements may exist to ensure the safety of personnel in this regard.
This second edition cancels and replaces the first edition published in 2010. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) modification of the title of this document to include artificially ventilated room "v" in addition to pressurized room "p";
b) addition of types of protection "pb", "pc", and "vc" and removal of types of protection "px", "py", "pz" and "pv";
c) definition of the differences between pressurization and artificial ventilation types of protection;
d) removal of protection of rooms with an inert gas or a flammable gas from the scope of this document;
e) addition of an informative annex to include examples of applications where types of protection pressurization or artificial ventilation or pressurization and artificial ventilation can be used and associated guidelines.

Atmosphères explosives - Partie 13: Protection du matériel par salle à surpression interne "p" et salle à ventilation artificielle "v"

IEC 60079-13:2017 définit les exigences relatives à la conception, la construction, l'évaluation, la vérification et le marquage de salles utilisées pour protéger le matériel interne:
– situées dans une atmosphère explosive de Zone 1 ou de Zone 2 ou de Zone 21 ou de Zone 22 n'incluant pas de source interne de dégagement de gaz/vapeur et protégées par surpression interne;
– situées dans une atmosphère explosive de Zone 2 incluant ou n’incluant pas de source interne de dégagement de gaz/vapeur et protégées par ventilation artificielle;
– situées dans un emplacement non dangereux incluant une source interne de dégagement de gaz/vapeur et protégées par ventilation artificielle;
– situées dans une atmosphère explosive de Zone 1 ou de Zone 2 ou de Zone 21 ou de Zone 22 incluant une source interne de dégagement de gaz/vapeur et protégées à la fois par surpression interne et par ventilation artificielle.
Le terme «salle» utilisé dans le présent document désigne des salles uniques, plusieurs salles, un bâtiment complet ou une salle contenue dans un bâtiment. Destinée à faciliter l’entrée du personnel, une salle inclut les canalisations d'entrée et de sortie. Une hotte acoustique et d’autres enveloppes similaires destinées à permettre l’entrée du personnel peuvent être considérées comme une salle.
Le présent document couvre également les exigences applicables aux dispositifs et contrôles de sécurité nécessaires à l'établissement et au maintien de la ventilation artificielle, du balayage et de la surpression interne.
Une salle montée ou construite sur site peut se trouver à terre ou en mer. La salle est principalement destinée à être installée par un utilisateur final, mais elle peut être construite et évaluée à l'usine du fabricant lorsque les opérations de construction finale telles que la réalisation des canalisations peuvent être effectuées sur site.
Le présent document ne précise pas les méthodes qui peuvent être exigées pour garantir au personnel une qualité d'air appropriée en matière de toxicité et de température dans la salle. À cet égard, des exigences et règlements nationaux ou autres destinés à garantir la sécurité du personnel peuvent exister.
Cette deuxième édition annule et remplace la première édition parue en 2010. Cette édition constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l’édition précédente:
a) modification du titre du présent document pour inclure l’expression salle en ventilation artificielle «v» en plus de salle en surpression interne «p»;
b) ajout des modes de protection «pb», «pc», et «vc» et suppression des modes de protection «px», «py», «pz» et «pv»;
c) définition des différences entre les modes de protection par surpression interne et par ventilation artificielle;
d) suppression de la protection des salles par un gaz inerte ou un gaz inflammable relevant du domaine d’application du présent document;
e) ajout d’une annexe informative pour inclure des exemples d’applications dans lesquelles les modes de protection par surpression interne et/ou par ventilation artificielle peuvent être utilisés ainsi que des lignes directrices correspondantes.

General Information

• Status: Published
• Publication Date: 21-May-2017
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 29.260.20 - Electrical apparatus for explosive atmospheres
• Technical Committee: SC 31J - Classification of hazardous areas and installation requirements
• Current Stage: PPUB - Publication issued
• Start Date: 02-Jun-2017
• Completion Date: 22-May-2017

Standards Content (Sample)

IEC 60079-13 ®
Edition 2.0 2017-05
INTERNATIONAL
STANDARD
Explosive atmospheres –
Part 13: Equipment protection by pressurized room "p" and artificially ventilated
room "v"
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.

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3, rue de Varembé Fax: [phone]
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Switzerland www.iec.ch
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

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IEC 60079-13 ®
Edition 2.0 2017-05
INTERNATIONAL
STANDARD
Explosive atmospheres –
Part 13: Equipment protection by pressurized room "p" and artificially ventilated

room "v"
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.260.20 ISBN 978-2-8322-4326-8

– 2 – IEC 60079-13:2017 © IEC 2017
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 10
3 Terms and definitions . 11
4 Requirements for all rooms . 13
4.1 General . 13
4.2 Type and level of protection . 13
4.2.1 Pressurization "p" . 13
4.2.2 Artificial ventilation "v" . 14
4.3 Construction . 14
4.4 Mechanical strength . 14
4.5 Penetrations and seals . 14
4.6 Personnel access doors . 14
4.7 Inlets and outlets . 15
4.8 Ducts . 15
4.9 Purging and cleaning . 15
4.9.1 General . 15
4.9.2 Gases – Purging . 15
4.9.3 Enclosures within the room . 16
4.10 Ignition prevention under system failure . 16
5 Clean air supply. 16
5.1 General . 16
5.2 Source of clean air . 16
5.3 Environmental and air temperature conditions . 17
5.4 Heating, ventilation and air conditioning services . 17
6 Requirements for pressurized rooms . 17
6.1 General . 17
6.1.1 Design . 17
6.1.2 Source of clean air . 17
6.1.3 Flow . 17
6.1.4 Pressurization system . 17
6.1.5 Preventing the explosive atmosphere from entering through an open
door . 18
6.1.6 Airlock . 18
6.1.7 Outward air velocity through a door . 18
6.1.8 Air consuming device . 19
6.1.9 Action when pressurization system fails . 19
6.1.10 Re-energizing the room . 19
6.2 Purging of rooms . 19
6.2.1 General . 19
6.2.2 Sequence of operations of the purging safety devices . 20
6.2.3 Dusts – Cleaning . 20
6.3 Minimum safety provisions, safety devices and electrical disconnects . 20
6.3.1 Safety devices . 20
6.3.2 Safety devices based upon level of protection . 21

6.3.3 Gas detectors . 21
6.4 Verification for pressurized rooms . 21
6.4.1 General . 21
6.4.2 Tests . 21
6.4.3 Overpressure test . 22
6.4.4 Purging test . 22
6.4.5 Minimum pressure differential test . 22
6.4.6 Confirmation of the ratings of the safety devices . 22
6.4.7 Verification of sequence of operation of the safety devices . 22
7 Requirements for artificially ventilated rooms . 22
7.1 General . 22
7.1.1 Design . 22
7.1.2 Source of clean air . 22
7.1.3 Minimum flow rate . 23
7.1.4 Ventilation system . 23
7.1.5 Air consuming device . 24
7.1.6 Safety actions when ventilation system fails . 24
7.1.7 Energizing the artificially ventilated area . 24
7.2 Purging of artificially ventilated rooms . 25
7.2.1 General . 25
7.2.2 Sequence of operations of the purging safety devices . 25
7.3 Minimum safety provisions, safety devices and electrical disconnects . 25
7.3.1 Safety devices . 25
7.3.2 Safety devices based upon equipment protection level . 25
7.3.3 Artificial ventilation protection . 26
7.3.4 Gas detectors . 26
7.4 Loss of artificial ventilation . 26
7.5 Verification for artificially ventilated rooms . 27
7.5.1 General . 27
7.5.2 Tests . 27
7.5.3 Purging test . 27
7.5.4 Minimum ventilation flow rate test . 27
7.5.5 Confirmation of the ratings of the safety devices . 27
7.5.6 Verification of sequence of operation of the safety devices . 27
7.5.7 Testing of ventilation system . 28
8 Marking . 28
8.1 General . 28
8.2 Marking of pressurized rooms . 28
8.3 Marking for artificially ventilated rooms . 29
9 Instructions . 30
9.1 General . 30
9.2 Technical documentation for pressurized rooms . 30
9.3 Technical documentation for artificially ventilated rooms . 30
9.4 Technical documentation for rooms protected by pressurization and artificial
ventilation combined . 31
9.5 Modifications. 31
Annex A (informative) Maintenance. 32
A.1 Periodic verification . 32
A.2 Modifications.
...

IEC 60079-13 ®
Edition 2.0 2017-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Explosive atmospheres –
Part 13: Equipment protection by pressurized room "p" and artificially ventilated
room "v"
Atmosphères explosives –
Partie 13: Protection du matériel par salle à surpression interne «p» et salle à
ventilation artificielle «v»
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.

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About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.

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Technical Specifications, Technical Reports and other English and French, with equivalent terms in 16 additional
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The advanced search enables to find IEC publications by a 67 000 electrotechnical terminology entries in English and
variety of criteria (reference number, text, technical French extracted from the Terms and Definitions clause of
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and withdrawn publications. collected from earlier publications of IEC TC 37, 77, 86 and

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IEC 60079-13 ®
Edition 2.0 2017-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Explosive atmospheres –
Part 13: Equipment protection by pressurized room "p" and artificially ventilated

room "v"
Atmosphères explosives –
Partie 13: Protection du matériel par salle à surpression interne «p» et salle à

ventilation artificielle «v»
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.260.20 ISBN 978-2-8322-6204-7

– 2 – IEC 60079-13:2017 © IEC 2017
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 10
3 Terms and definitions . 11
4 Requirements for all rooms . 13
4.1 General . 13
4.2 Type and level of protection . 13
4.2.1 Pressurization "p" . 13
4.2.2 Artificial ventilation "v" . 14
4.3 Construction . 14
4.4 Mechanical strength . 14
4.5 Penetrations and seals . 14
4.6 Personnel access doors . 14
4.7 Inlets and outlets . 15
4.8 Ducts . 15
4.9 Purging and cleaning . 15
4.9.1 General . 15
4.9.2 Gases – Purging . 15
4.9.3 Enclosures within the room . 16
4.10 Ignition prevention under system failure . 16
5 Clean air supply. 16
5.1 General . 16
5.2 Source of clean air . 16
5.3 Environmental and air temperature conditions . 17
5.4 Heating, ventilation and air conditioning services . 17
6 Requirements for pressurized rooms . 17
6.1 General . 17
6.1.1 Design . 17
6.1.2 Source of clean air . 17
6.1.3 Flow . 17
6.1.4 Pressurization system . 17
6.1.5 Preventing the explosive atmosphere from entering through an open
door . 18
6.1.6 Airlock . 18
6.1.7 Outward air velocity through a door . 18
6.1.8 Air consuming device . 19
6.1.9 Action when pressurization system fails . 19
6.1.10 Re-energizing the room . 19
6.2 Purging of rooms . 19
6.2.1 General . 19
6.2.2 Sequence of operations of the purging safety devices . 20
6.2.3 Dusts – Cleaning . 20
6.3 Minimum safety provisions, safety devices and electrical disconnects . 20
6.3.1 Safety devices . 20
6.3.2 Safety devices based upon level of protection . 21

6.3.3 Gas detectors . 21
6.4 Verification for pressurized rooms . 21
6.4.1 General . 21
6.4.2 Tests . 21
6.4.3 Overpressure test . 22
6.4.4 Purging test . 22
6.4.5 Minimum pressure differential test . 22
6.4.6 Confirmation of the ratings of the safety devices . 22
6.4.7 Verification of sequence of operation of the safety devices . 22
7 Requirements for artificially ventilated rooms . 22
7.1 General . 22
7.1.1 Design . 22
7.1.2 Source of clean air . 22
7.1.3 Minimum flow rate . 23
7.1.4 Ventilation system . 23
7.1.5 Air consuming device . 24
7.1.6 Safety actions when ventilation system fails . 24
7.1.7 Energizing the artificially ventilated area . 24
7.2 Purging of artificially ventilated rooms . 25
7.2.1 General . 25
7.2.2 Sequence of operations of the purging safety devices . 25
7.3 Minimum safety
...