Classification of environmental conditions - Part 2-3: Environmental conditions appearing in nature - Air pressure

IEC 60721-2-3:2013 presents a selection of different values of air pressure appearing in nature. It is intended to be used as part of the background material when selecting appropriate severities of air pressure for product applications, which products are liable to be exposed during storage, transportation and use. This second edition cancels and replaces the first edition, published in 1987, and constitutes a technical revision. The main changes with regard to the previous edition are as follows:
- removal of figures for decreasing cooling efficiency for altitude;
- simplification of Table 1;
- additional formula for calculating air pressure from altitude.

Classification des conditions d'environnement - Partie 2-3: Conditions d'environnement présentes dans la nature - Pression atmosphérique

La CEI 60721-2-3:2013 présente une sélection des différentes valeurs de la pression atmosphérique présentes dans la nature. Elle est destinée à fournir une partie des informations de base lors du choix des sévérités de pression atmosphérique appropriées pour l'utilisation des produits, auxquelles les produits sont susceptibles d'être exposés pendant leur stockage, leur transport et leur utilisation. Cette deuxième édition annule et remplace la première édition, parue en 1987, dont elle constitue une révision technique. Les modifications principales par rapport à l'édition précédente sont les suivantes:
- suppression de valeurs pour la diminution d'efficacité de refroidissement pour l'altitude;
- simplification du Tableau 1;
- ajout d'une formule pour le calcul de la pression atmosphérique à partir de l'altitude.

General Information

Status
Published
Publication Date
18-Jun-2013
Current Stage
PPUB - Publication issued
Start Date
19-Jun-2013
Completion Date
19-Jun-2013
Ref Project

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IEC 60721-2-3
Edition 2.0 2013-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Classification of environmental conditions –
Part 2-3: Environmental conditions appearing in nature – Air pressure
Classification des conditions d'environnement –
Partie 2-3: Conditions d'environnement présentes dans la nature – Pression
atmosphérique
IEC 60721-2-3:2013
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60721-2-3
Edition 2.0 2013-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Classification of environmental conditions –
Part 2-3: Environmental conditions appearing in nature – Air pressure
Classification des conditions d'environnement –
Partie 2-3: Conditions d'environnement présentes dans la nature – Pression
atmosphérique
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX H
ICS 19.040 ISBN 978-2-83220-875-5

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – 60721-2-3 © IEC:2013
CONTENTS

FOREWORD ........................................................................................................................... 3

1 Scope ............................................................................................................................... 5

2 Normative references ....................................................................................................... 5

3 Terms and definitions ....................................................................................................... 5

4 Air pressure effects .......................................................................................................... 5

4.1 General ................................................................................................................... 5

4.2 Air pressure lower than normal ................................................................................ 5

4.3 Air pressure higher than normal .............................................................................. 6

5 Values of air pressure ...................................................................................................... 6

Bibliography ............................................................................................................................ 8

Table 1 – Normal air pressure related to altitudes above and below sea-level ......................... 6

---------------------- Page: 4 ----------------------
60721-2-3 © IEC:2013 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
CLASSIFICATION OF ENVIRONMENTAL CONDITIONS –
Part 2-3: Environmental conditions appearing in nature –
Air pressure
FOREWORD

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patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 60721-2-3 has been prepared by IEC technical committee 104:

Environmental conditions, classification and methods of test.

This second edition cancels and replaces the first edition, published in 1987, and constitutes

a technical revision.
The main changes with regard to the previous edition are as follows:
– removal of figures for decreasing cooling efficiency for altitude;
– simplification of Table 1;
– additional formula for calculating air pressure from altitude.
---------------------- Page: 5 ----------------------
– 4 – 60721-2-3 © IEC:2013
The text of this standard is based on the following documents:
FDIS Report on voting
104/611/FDIS 104/615/RVD

Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table.

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all parts in the IEC 60068 series, under the general title Classification of

environmental conditions, can be found on the IEC website.

The committee has decided that the contents of this publication will remain unchanged until

the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data

related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
---------------------- Page: 6 ----------------------
60721-2-3 © IEC:2013 – 5 –
CLASSIFICATION OF ENVIRONMENTAL CONDITIONS –
Part 2-3: Environmental conditions appearing in nature –
Air pressure
1 Scope

This part of IEC 60721 presents a selection of different values of air pressure appearing in

nature. It is intended to be used as part of the background material when selecting

appropriate severities of air pressure for product applications, which products are liable to be

exposed during storage, transportation and use.
2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and

are indispensable for its application. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any
amendments) applies.

IEC 60721-1, Classification of environmental conditions – Part 1: Environmental parameters

and their severities
3 Terms and definitions
Terms and definitions are defined, in context, throughout the present standard.
4 Air pressure effects
4.1 General

When selecting severities of the parameter air pressure for product application, the values

given in IEC 60721-1 should be applied.

Air pressure can affect products in various ways, the most important of which are as follows:

4.2 Air pressure lower than normal

Low air pressure occurring at altitudes above sea-level can affect products as follows:

– leakage of gases or fluids from gasket-sealed containers;
– rupture of pressurized containers;
– change of physical and chemical properties of low density materials;

– erratic operation or malfunction of equipment from arcing or corona as the breakdown

voltage between two electrodes in air decreases with pressure (the breakdown voltage of

air in a uniform electric field depends on the product of the gas pressure and the electrode

spacing for a given electrode shape and material (Paschen's law));
– decreased efficiency of heat dissipation by convection and conduction in air;

– acceleration of effects due essentially to temperature, for example volatilization of

plasticizers, evaporation of lubricants, etc.
---------------------- Page: 7 ----------------------
– 6 – 60721-2-3 © IEC:2013
4.3 Air pressure higher than normal

High air pressure occurring in natural depressions and mines can have a mechanical effect on

sealed containers.
5 Values of air pressure

The normal value of air pressure at mean sea level is 101,325 kPa. Depending on meteo-

rological conditions, air press
...

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