1、BSI Standards PublicationClassification of environmental conditionsPart 2-3: Environmental conditions appearing in nature Air pressureBS EN 60721-2-3:2014BS 7527-2-3:2014National forewordThis British Standard is the UK implementation of EN 60721-2-3:2014. It is identical to IEC 60721-2-3:2013. It su
2、persedes BS 7527-2.3:1991, whichwill be withdrawn on 19 November 2016.The UK participation in its preparation was entrusted to TechnicalCommittee GEL/104, Environmental conditions, classification and testing.A list of organizations represented on this committee can be obtained onrequest to its secre
3、tary.This publication does not purport to include all the necessary provisions ofa contract. Users are responsible for its correct application. The British Standards Institution 2014.Published by BSI Standards Limited 2014ISBN 978 0 580 72026 0ICS 19.040Compliance with a British Standard cannot conf
4、er immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 August 2014.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN 60721-2-3:2014EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NOR
5、MEN 60721-2-3 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 denvironnement - Partie 2-3: Conditions denvironnemen
6、t prsentes dans lanature - Pression atmosphrique (CEI 60721-2-3:2013) Klassifizierung von Umgebungsbedingungen - Teil 2-3: Natrliche Umgebungsbedingungen - Luftdruck(IEC 60721-2-3:2013) This European Standard was approved by CENELEC on 2013-07-24. CENELEC members are bound to comply with the CEN/CEN
7、ELEC 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 o
8、r 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
9、 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, Lux
10、embourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. European Committee for Electrotechnical Standardization Comit Europen de Normalisation ElectrotechniqueEuropisches Komitee fr Elektrotechnische Normung C
11、EN-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 BS EN 60721-2-3:2014Foreword The text of document 104/611/FDIS, future edition 2 of IEC 60721-2-3,
12、 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: latest date by which the document has to be implemented at national level by publication
13、of an identical national standard or by endorsement (dop) 2014-12-20 latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2016-07-24 This document supersedes HD 478.2.3 S1:1990. EN 60721-2-3:2014 includes the following significant technical changes wit
14、h respect to 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
15、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. BS EN 60721-2-3:2014 EN 60721-2-3:2014Annex ZA
16、 (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. Fo
17、r 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 Euro
18、pean Standards listed in this annex is available here: www.cenelec.eu Publication Year Title EN/HD Year IEC 60721-1 - Classification of environmental conditions - Part 1: Environmental parameters and their severities EN 60721-1 - BS EN 60721-2-3:2014 EN 60721-2-3:2014 2 60721-2-3 IEC:2013 CONTENTS 1
19、 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 .
20、 6 BS EN 60721-2-3:2014 EN 60721-2-3:201460721-2-3 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
21、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 i
22、n 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 par
23、ameters 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.
24、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 co
25、ntainers; 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 p
26、roduct of the gas pressure and the electrode spacing for a given electrode shape and material (Paschens 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
27、of lubricants, etc. BS EN 60721-2-3:2014 EN 60721-2-3:2014 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 le
28、vel is 101,325 kPa. Depending on meteo-rological conditions, air pressure at sea level may vary. Similar variation occurs at altitudes above and below sea-level. In areas above sea-level, air pressure is lower than at sea level; in areas below sea level (natural depressions and mines) it is higher t
29、han at sea-level. Table 1 gives standard values of air pressure, in round figures, for different altitudes. Table 1 Normal air pressure related to altitudes above and below sea-level Altitude m Air pressure kPa 15 000 12,0 10 000 26,6 8 000 35,6 6 000 47,2 5 000 54,0 4 000 61,6 3 000 70,1 2 000 79,5
30、 1 000 89,9 0 Sea level 101,3 400 106,2 NOTE 1 Values corresponding to the highest altitudes are given to take into account meteorological observation units and transportation by air. NOTE 2 The altitude 400 m corresponds to the deepest natural depression in the world. NOTE 3 For further information
31、, see 1. BS EN 60721-2-3:2014 EN 60721-2-3:201460721-2-3 IEC:2013 7 According to 1, the formula for calculating the relation between altitude and air pressure is: p = p0 (1 (L h) / T0) g / (R L) (for altitude below 11 000 m); and p = p1 e (g (hh1) / (R T1)(for altitude between 11 000 m and 20 000 m)
32、; where p is the air pressure (kPa); p0= 101,325 kPa (standard pressure at sea level); p1= 22,632 kPa (standard pressure at 11 000 m); h is the altitude above sea level (m) (20 000 m); h1= 11 000 m (altitude at 11 000 m); L = 0,006 5 K/m (temperature lapse rate); T0= 288,15 K (standard temperature a
33、t sea level); T1= 216,65 K (standard temperature at 11 000 m); g = 9,806 65 m/s2(earth-surface gravitational acceleration); R = 287,053 J/(kg.K) (universal gas constant). BS EN 60721-2-3:2014 EN 60721-2-3:2014 8 60721-2-3 IEC:2013 Bibliography 1 ISO 2533, Standard Atmosphere _ BS EN 60721-2-3:2014 E
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