EN 60721-2-3:2014

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.

Klassifizierung von Umgebungsbedingungen - Teil 2-3: Natürliche Umgebungsbedingungen - Luftdruck

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.

Klasifikacija okoljskih pogojev - 2-3. del: Okoljski pogoji v naravi - Zračni tlak (IEC 60721-2-3:2013)

Ta del standarda IEC 60721 vključuje izbor različnih vrednosti zračnega tlaka, prisotnih v naravi. Namenjen je za uporabo kot del osnovnega gradiva pri izbiri ustreznih ravni zračnega tlaka za uporabo proizvodov, ki so jim ti lahko izpostavljeni pri skladiščenju, prevozu in uporabi.

General Information

• Status: Published
• Publication Date: 19-Jun-2014
• Withdrawal Date: 23-Jul-2016
• ICS: 19.040 - Environmental testing
• Technical Committee: CLC/SR 104 - Environmental conditions, classification and methods of test
• Drafting Committee: IEC/TC 104 - IEC_TC_104
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 20-Jun-2014
• Completion Date: 20-Jun-2014
• Ref Project: SIST EN 60721-2-3:2016 - Classification of environmental conditions - Part 2-3: Environmental conditions appearing in nature - Air pressure (IEC 60721-2-3:2013)

Relations

• Replaces: HD 478.2.3 S1:1990 - Classification of environmental conditions - Part 2: Environmental conditions appearing in nature - Air pressure
• Effective Date: 29-Jan-2023

Overview

EN 60721-2-3:2014 (identical to IEC 60721-2-3:2013) is a European/IEC standard for the classification of environmental conditions - air pressure. It provides a selection of naturally occurring air pressure values and background material to help manufacturers, test laboratories and designers select appropriate air-pressure severities for products during storage, transportation and use. This second edition replaces the 1987 edition and includes a simplified table of standard pressures and an additional formula to calculate pressure from altitude.

Key topics

• Scope and purpose
  • Presents representative air-pressure values occurring above and below sea level for environmental classification and test planning.
• Air-pressure effects on products
  • Low pressure (high altitude) can cause: leakage of gasketed containers, rupture of pressurized vessels, changes in material behaviour, arcing/corona effects (Paschen’s law), reduced convective heat dissipation and accelerated volatilization of lubricants/plasticizers.
  • High pressure (natural depressions, mines) can produce mechanical stress on sealed containers.
• Standard values
  • Normal sea-level pressure: 101.325 kPa.
  • Example values from Table 1 (rounded): 15 000 m = 12.0 kPa, 10 000 m = 26.6 kPa, 8 000 m = 35.6 kPa, 6 000 m = 47.2 kPa, 4 000 m = 61.6 kPa, 0 m (sea level) = 101.3 kPa, –400 m = 106.2 kPa.
• Altitude–pressure relations
  • Includes formulas to compute air pressure from altitude (two regimes: below 11 000 m and 11 000–20 000 m) and defines parameters used (p0, p1, L, T0, T1, g, R).
• Notable editorial changes
  • Removal of altitude-related cooling-efficiency figures, simplification of Table 1, and addition of the altitude-pressure formula.

Applications

• Product design & qualification
  • Set environmental severity levels for electronics, pressure vessels, seals, HVAC and aerospace components.
• Environmental testing & certification
  • Define test conditions for storage, transit and operational use in laboratories and certification programs.
• Risk assessment & logistics
  • Inform packaging and transport specifications for goods moving through high-altitude locations or deep depressions.
• Thermal and electrical analysis
  • Account for reduced convective cooling and altered dielectric breakdown behaviour at reduced pressures.

Who should use this standard

• Manufacturers of electrotechnical and mechanical products
• Environmental test laboratories and conformity assessment bodies
• Design engineers, test engineers and product qualification teams
• Logistics and packaging specialists dealing with altitude-exposed transport

Related standards

• IEC/EN 60721‑1 - Classification of environmental conditions: Part 1 (environmental parameters and their severities)
• ISO 2533 (Standard Atmosphere) - referenced for altitude–pressure relations

Keywords: EN 60721-2-3, IEC 60721-2-3, air pressure classification, environmental testing, altitude pressure formula, product qualification, sea-level pressure.

Standards Content (Sample)

SLOVENSKI STANDARD
01-november-2016
1DGRPHãþD
SIST HD 478.2.3 S1:2003
.ODVLILNDFLMDRNROMVNLKSRJRMHYGHO2NROMVNLSRJRMLYQDUDYL=UDþQLWODN,(&

Classification of environmental conditions - Part 2-3: Environmental conditions appearing
in nature - Air pressure (IEC 60721-2-3:2013)
Klassifizierung von Umweltbedingungen - Teil 2-3: Natürliche Einflüsse - Luftdruck (IEC
60721-2-3:2013)
Classification des conditions d'environnement - Partie 2-3: Conditions d'environnement
présentes dans la nature - Pression atmosphérique (IEC 60721-2-3:2013)
Ta slovenski standard je istoveten z: EN 60721-2-3:2014
ICS:
19.040 Preskušanje v zvezi z Environmental testing
okoljem
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 60721-2-3

NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2014
ICS 19.040 Supersedes HD 478.2.3 S1:1990
English Version
Classification of environmental conditions - Part 2-3:
Environmental conditions appearing in nature - Air pressure
(IEC 60721-2-3:2013)
Classification des conditions d'environnement -  Klassifizierung von Umgebungsbedingungen -
Partie 2-3: Conditions d'environnement présentes dans la Teil 2-3: Natürliche Umgebungsbedingungen - Luftdruck
nature - Pression atmosphérique (IEC 60721-2-3:2013)
(CEI 60721-2-3:2013)
This European Standard was approved by CENELEC on 2013-07-24. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2014 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 60721-2-3:2014 E
Foreword
The text of document 104/611/FDIS, future edition 2 of IEC 60721-2-3, prepared by IEC/TC 104
"Environmental conditions, classification and methods of test" was submitted to the IEC-CENELEC
parallel vote and approved by CENELEC as EN 60721-2-3:2014.

The following dates are fixed:
(dop) 2014-12-20
• latest date by which the document has to be
implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2016-07-24
standards conflicting with the
document have to be withdrawn
This document supersedes HD 478.2.3 S1:1990.

HD 478.2.3 S1:1990:
– removal of figures for decreasing cooling efficiency for altitude;
– simplification of Table 1;
– additional formula for calculating air pressure from altitude.

Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.
Endorsement notice
The text of the International Standard IEC 60721-2-3:2013 was approved by CENELEC as a
European Standard without any modification.

- 3 - EN 60721-2-3:2014
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

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.

NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu
Publication Year Title EN/HD Year
IEC 60721-1 - Classification of environmental conditions - EN 60721-1 -
Part 1: Environmental parameters and their
severities
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

– 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

60721-2-3 © IEC:2013 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
CLASSIFICATION OF ENVIRONMENTAL CONDITIONS –

Part 2-3: Environmental conditions appearing in nature –
Air pressure
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes Internationa
...