BS EN 60079-2-2007 Explosive atmospheres - Part 2 Equipment protection by npressurized enclosure p 《爆炸性环境 第2部分 p 型压力封装的防护设备》.pdf

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1、Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 29/04/2008 02:13, Uncontrolled Copy, (c) BSIg49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58p

2、ressurized enclosure “p”The European Standard EN 60079-2:2007 has the status of a British StandardICS 29.260.20Explosive atmospheres Part 2: Equipment protection by BRITISH STANDARDBS EN 60079-2:2007BS EN 60079-2:2007Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 29/04/2008 02:13, Uncontroll

3、ed Copy, (c) BSIThis British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 January 2008 BSI 2008ISBN 978 0 580 54512 2Amendments issued since publicationAmd. No. Date CommentsThis publication does not purport to include all the necessary provisions o

4、f a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.National forewordThis British Standard is the UK implementation of EN 60079-2:2007. It is identical to IEC 60079-2:2007. It supersedes BS EN 60079-2:2004 w

5、hich is withdrawn.The UK participation in its preparation was entrusted to Technical Committee GEL/31, Equipment for explosive atmospheres.A list of organizations represented on this committee can be obtained on request to its secretary.EUROPEAN STANDARD EN 60079-2 NORME EUROPENNE EUROPISCHE NORM No

6、vember 2007 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2007 CENELEC - All rights of exploitation in any form and by any mea

7、ns reserved worldwide for CENELEC members. Ref. No. EN 60079-2:2007 E ICS 29.260.20 Supersedes EN 60079-2:2004English version Explosive atmospheres - Part 2: Equipment protection by pressurized enclosure “p“ (IEC 60079-2:2007) Atmosphres explosives - Partie 2: Protection du matriel par enveloppe sur

8、pression interne “p“ (CEI 60079-2:2007) Explosionsfhige Atmosphre - Teil 2: Gerteschutz durch berdruckkapselung “p“ (IEC 60079-2:2007) This European Standard was approved by CENELEC on 2007-11-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the condi

9、tions 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 Central Secretariat or to any CENELEC member. This European Standard exists in th

10、ree 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 Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechni

11、cal committees of Austria, Belgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and

12、 the United Kingdom. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 29/04/2008 02:13, Uncontrolled Copy, (c) BSIForeword The text of document 31/668/FDIS, future edition 5 of IEC 60079-2, prepared by IEC TC 31, Equipment for explosive atmospheres, was submitted to the IEC-CENELEC parallel vo

13、te and was approved by CENELEC as EN 60079-2 on 2007-11-01. This European Standard supersedes EN 60079-2:2004 + corrigendum April 2006. The significant changes with respect to EN 60079-2:2004 are listed below: introduction of the “Equipment protection level concept” See Annex H; 3.13 eliminate refer

14、ence to “room” in the definition of pressurization; 5.3.3 restrict to type px; 5.3.3 add warning for type pz and type py for any cover removable without the use of a tool; 7.6 move wording “For type px” to beginning of subclause to clarify 7.6 only applies to type px; 7.7 c) clarify that the instruc

15、tion label should specify purge time and pressure/flow; 18.7 collect marking requirements throughout the document in the “Marking” clause. This European Standard is to be read in conjunction with EN 60079-0:2006. The following dates were fixed: latest date by which the EN has to be implemented at na

16、tional level by publication of an identical national standard or by endorsement (dop) 2008-08-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2010-11-01 This European Standard was prepared under a mandate given to CENELEC by the European Commission a

17、nd the European Free Trade Association and supports the essential requirements of Directive 94/9/EC. See Annex ZZ. Annexes ZA and ZZ have been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 60079-2:2007 was approved by CENELEC as a European Standard without any mod

18、ification. 2 EN 60079-2:2007Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 29/04/2008 02:13, Uncontrolled Copy, (c) BSICONTENTS 1 2 3 4 5 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9 6 6.1 6.2 6.3 7 7.1 7.2 7.3 7.4 7.5 7.6 7.7 7.8 7.9 8 8.1 8.2 8.3 8.4 8.5 8.6 8.7 3 EN 60079-2:2007INTRODUCTION.6 Scop

19、e.7 Normative references .7 Terms and definitions .8 Protection types .10 Constructional requirements for pressurized enclosures .13 Enclosure13 Materials .13 Doors and covers 13 Mechanical strength 14 Apertures, partitions, compartments and internal components .14 Insulating materials .15 Sealing15

20、 Spark and particle barriers 15 Internal batteries .15 Temperature limits16 General .16 For type px or type py16 For type pz16 Safety provisions and safety devices (except for static pressurization) .16 Suitability of safety devices for hazardous area.16 Integrity of safety devices16 Provider of saf

21、ety devices .17 Sequence diagram for type px .17 Ratings for safety devices .17 Purging automated for type px.17 Purging criteria18 Requirements when a minimum flow rate required.18 Safety devices to detect overpressure .18 7.10 Value of overpressure .19 7.11 Pressurizing multiple enclosures .20 7.1

22、2 Safety devices on doors and covers 20 7.13 Protection types that may remain energized 20 7.14 Protection types permitted within type py.20 Safety provisions and safety devices for static pressurization.20 Suitability of safety devices for hazardous area.20 Protective gas .21 Internal sources of re

23、lease 21 Filling procedure .21 Safety devices.21 Protection types that may remain energized 21 Overpressure 21 Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 29/04/2008 02:13, Uncontrolled Copy, (c) BSI9 9.1 9.2 16.3 Purging test for pressurized enclosures with no internal source of release

24、(pressurization technique may be leakage compensation or continuous flow) 16.4 Purging and dilution tests for a pressurized enclosure with an internal source 4 EN 60079-2:2007Supply of protective gas .21 Type of gas .21 Temperature22 10 Pressurized equipment with an internal source of release.22 11

25、Release conditions .22 11.1 No release.22 11.2 Limited release of a gas or vapour.22 11.3 Limited release of a liquid22 12 Design requirements for the containment system23 12.1 General design requirements.23 12.2 Infallible containment system 23 12.3 Containment system with a limited release 23 13 P

26、rotective gas and pressurizing techniques 24 13.1 General .24 13.2 Pressurization with leakage compensation 25 13.3 Pressurization with dilution25 14 Ignition-capable apparatus .26 15 Internal hot surfaces.26 16 Type verification and tests27 16.1 Maximum overpressure test.27 16.2 Leakage test .27 an

27、d filling procedure test for static pressurization27 of release 28 16.5 Verification of minimum overpressure30 16.6 Tests for an infallible containment system .30 16.7 Overpressure test for a containment system with a limited release 31 16.8 Verifying ability of the pressurized enclosure to limit in

28、ternal pressure 31 17 Routine tests 32 17.1 Functional test.32 17.2 Leakage test .32 17.3 Tests for an infallible containment system .32 17.4 Test for a containment system with a limited release.32 18 Marking 32 18.1 Identifying as pressurized32 18.2 Warnings.32 18.3 Supplementary marking.32 18.4 In

29、ternal source of release33 18.5 Static pressurization33 18.6 Pressurization systems33 18.7 Warnings required in other clauses .33 18.8 Overpressure limited by user.33 18.9 Inert gas34 19 Instructions.34 Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 29/04/2008 02:13, Uncontrolled Copy, (c) B

30、SIAnnex H (informative) Introduction of an alternative risk assessment method Figure C.2 Pressurized enclosures with leakage compensation, enclosures without Figure C.3 Pressurized enclosures with leakage compensation, rotating electrical Figure C.4 Pressurized enclosure with a leakage compensation,

31、 rotating electrical Figure F.1 Diagram showing the use of the dilution area concept to simplify the purge Figure F.2 Diagram showing the use of the infallible containment system concept to Figure F.3 Diagram showing the use of internal partitions around the potential source of release to simplify t

32、he purging and dilution requirements around ICA located outside Table 4 Protective gas requirements for a pressurized enclosure with a containment 5 EN 60079-2:2007Annex A (normative) Purging and dilution tests35 Annex B (informative) Examples of functional sequence diagram.37 Annex C (informative)

33、Examples of the changes in pressure in ducts and enclosures 39 Annex D (informative) Information to be provided to the user .44 Annex E (normative) Classification of the type of release within enclosures.46 Annex F (informative) Examples for the use of the dilution area concept47 Annex G (normative)

34、 Infallibility test for containment system49 encompassing “equipment protection levels” for Ex equipment .50 Bibliography55 Figure B.1 State diagram of a leakage-compensation purge control system .37 Figure C.1 a) Protective gas outlet without a spark and particle barrier39 Figure C.1 b) Protective

35、gas outlet with a spark and particle barrier.40 moving parts.41 machine with an internal cooling fan .42 machine with an external cooling fan 43 and dilution test requirements.47 simplify the purging and dilution requirements around ICA48 the partitions.48 Figure G.1 Schematic diagram of the infalli

36、bility test described in 16.6.2 a) .49 Table 1 Determination of protection type11 Table 2 Design criteria based upon type of protection12 Table 3 Safety devices based upon protection type17 system24 Table 5 Protection types permitted within the dilution area.26 Table B.1 Truth table of a leakage-com

37、pensation purge control system .37 Table H.1 Traditional relationship of EPLs to zones (no additional risk assessment) .52 Table H.2 Description of risk of ignition protection provided .53 Annex ZA (normative) Normative references to international publications with their Annex ZZ (informative) Cover

38、age of Essential Requirements of EC Directives57corrresponding European publications 56Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 29/04/2008 02:13, Uncontrolled Copy, (c) BSIINTRODUCTION This part of IEC 60079 gives requirements for the design, construction, testing and marking of electr

39、ical apparatus for use in potentially explosive atmospheres in which a) a protective gas maintained at a pressure above that of the external atmosphere is used to guard against the formation of an explosive gas atmosphere within enclosures which do not contain an internal source of release of flamma

40、ble gas or vapour and, where necessary; b) a protective gas is provided in sufficient quantity to ensure that the resultant mixture concentration around the electrical parts is maintained at a value outside the explosive limit appropriate to the particular conditions of use. The protective gas is su

41、pplied to an enclosure containing one or more internal sources of release in order to guard against the formation of an explosive gas atmosphere. This standard includes requirements for the apparatus and its associated equipment including the inlet and exhaust ducts, and also for the auxiliary contr

42、ol apparatus necessary to ensure that pressurization and/or dilution is established and maintained. 6 EN 60079-2:2007Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 29/04/2008 02:13, Uncontrolled Copy, (c) BSIEXPLOSIVE ATMOSPHERES Part 2: Equipment protection by pressurized enclosure “p“ 1 Sc

43、ope This part of IEC 60079 contains the specific requirements for the construction and testing of electrical apparatus with pressurized enclosures, of type of protection “p”, intended for use in explosive gas atmospheres. It specifies requirements for pressurized enclosures containing a limited rele

44、ase of a flammable substance. This standard supplements and modifies the general requirements of IEC 60079-0. Where a requirement of this standard conflicts with a requirement of IEC 60079-0, the requirements of this standard takes precedence. This standard does not contain the requirements for: pre

45、ssurized enclosures where the containment system may release a) air with an oxygen content greater than normal, or b) oxygen in combination with inert gas in a proportion greater than 21 %; pressurized rooms or analyser houses; see IEC 60079-13 and IEC 60079-16. NOTE 1 Due to the safety factors inco

46、rporated in the type of protection, the uncertainty of measurement inherent in good quality, regularly calibrated measurement equipment is considered to have no significant detrimental effect and need not be taken into account when making the measurements necessary to verify compliance of the equipm

47、ent with the requirements of this standard. NOTE 2 When the user acts in the role of the manufacturer, it is typically the users responsibility to ensure that all relevant parts of this standard are applied to the manufacturing and testing of the equipment. NOTE 3 Types of protection “px” and “py”pr

48、ovide Equipment Protection Levels (EPL) Mb or Gb. Type of protection “pz” provides Equipment Protection Level (EPL) Gc. For further information, see Annex H. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only t

49、he edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60034-5, Rotating electrical machines Part 5: Degrees of protection provided by the integral design of rotating electrical machines (IP code) Classification IEC 60050(151), International Electrotechnical Vocabulary Chapter 151: Electrical and magnetic devices IEC 60050(426), International Electrotechnical Vocabulary Chapter 426: Electrical apparatu