1、BRITISH STANDARD BS EN 13463-2:2004 Non-electrical equipment for use in potentially explosive atmospheres Part 2: Protection by flow restricting enclosure fr The European Standard EN 13463-2:2004 has the status of a British Standard ICS 13.230 BS EN 13463-2:2004 This British Standard was published u
2、nder the authority of the Standards Policy and Strategy Committee on 22 July 2005 BSI 22 July 2005 ISBN 0 580 46126 2 National foreword This British Standard is the official English language version of EN 13463-2:2004. The UK participation in its preparation was entrusted to Technical Committee FSH/
3、23, Fire precautions in industrial and chemical plant, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related
4、international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be
5、found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are r
6、esponsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 13 and a back cover. The BSI copyright notice displayed i
7、n this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 13463-2 November 2004 ICS 13.230 English version Non-electrical equipment for use in potentially explosive atmospheres - Part 2:
8、 Protection by flow restricting enclosure fr Appareils non lectriques destins tre utiliss en atmosphres explosibles - Partie 2: Protection par enveloppe circulation limite fr Nicht-elektrische Gerte fr den Einsatz in explosionsgefhrdeten Bereichen - Teil 2: Schutz durch schwadenhemmende Kapselung fr
9、 This European Standard was approved by CEN on 14 October 2004. CEN 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 re
10、ferences concerning such national standards may be obtained on application to the Central Secretariat or to any CEN 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 CEN member
11、 into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithua
12、nia, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2004 CEN All r
13、ights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 13463-2:2004: EEN 13463-2:2004 (E) 2 Contents page Foreword3 Introduction .4 1 Scope 5 2 Normative references 5 3 Terms and definitions .5 4 General5 4.1 General requirements5 4.2 Determinatio
14、n of suitability 5 5 Specific requirements and limitations.6 5.1 Nature of ignition source 6 5.2 Test requirements6 5.3 Enclosures without the provision for carrying out checks after installation6 5.4 Enclosures with provisions for carrying out checks after installation6 5.5 Resilient gaskets7 5.6 P
15、oured seals and encapsulating compounds 7 5.7 Internal fans or similar devices7 5.8 Limits of operation.7 6 Verifications and tests 7 6.1 Preconditioning for seals and gaskets used to maintain the flow restricting effect7 6.2 Tests7 6.2.1 Equipment with provisions for checking of flow restricting pr
16、operties 7 6.2.2 Equipment without provisions for checking of flow restricting properties.7 6.2.3 Equipment where the nominal volume of the enclosure changes due to pressure .8 6.2.4 Routine production test 8 7 Instructions for use .8 8 Marking .8 Annex ZA (informative) Clauses of this European Stan
17、dard addressing essential requirements or other provisions of EU Directives9 Bibliography 13EN 13463-2:2004 (E) 3 Foreword This document (EN 13463-2:2004) has been prepared by Technical Committee CEN/TC 305 “Potentially explosive atmospheres - Explosion prevention and protection”, the secretariat of
18、 which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by May 2005, and conflicting national standards shall be withdrawn at the latest by May 2005. This document has been prepared un
19、der a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive 94/9/EC of 23 March 1994. For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document. This European Stan
20、dard consists of the following parts: EN 13463-1, Non-electrical equipment for potentially explosive atmospheres - Part 1: Basic method and requirements. EN 13463-2, Non-electrical equipment for use in potentially explosive atmospheres - Part 2: Protection by flow restricting enclosure “fr“. prEN 13
21、463-3, Non-electrical equipment for potentially explosive atmospheres - Part 3: Protection by flameproof enclosure d. EN 13463-5, Non-electrical equipment intended for use in potentially explosive atmospheres - Part 5: Protection by constructional safety “c“. prEN 13463-6, Non-electrical equipment f
22、or potentially explosive atmospheres - Part 6: Protection by control of ignition source b. EN 13463-8, Non-electrical equipment for potentially explosive atmospheres - Part 8: Protection by liquid immersion k. According to the CEN/CENELEC Internal Regulations, the national standards organizations of
23、 the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spa
24、in, Sweden, Switzerland and United Kingdom. EN 13463-2:2004 (E) 4 Introduction An explosive atmosphere surrounding an enclosure can penetrate it mainly due to the influence of three mechanisms: ventilation; equalisation of pressure differences between the inside and outside (breathing); diffusion. I
25、f such an enclosure is effectively sealed, but not necessarily gas-tight, it can be assumed that ventilation and diffusion will not cause a significant short-time exchange of atmosphere. Under these conditions, an exchange of the external and internal atmospheres through the seals will only take pla
26、ce if there is a pressure difference across them. Such pressure differences may be caused by changes in temperature and will result in the enclosure “breathing“ but will not cause a significant flow of explosive atmosphere into or through the enclosure. Experience has shown that even simple enclosur
27、es can prevent a surrounding explosive atmosphere from reaching ignition sources inside them. Flow restricting enclosures are such simple enclosures, which will prevent, with adequate probability, the atmosphere inside the enclosures becoming explosive if the atmosphere outside the enclosure becomes
28、 explosive rarely and for short durations only. For this reason their use is restricted to the fulfilment of category 3 requirements. This document is a type B standard as described in EN 1070.EN 13463-2:2004 (E) 5 1 Scope This document specifies the requirements for the construction and testing of
29、flow restricting enclosures for non- electrical equipment intended for use in potentially explosive atmospheres if the atmosphere outside the enclosure becomes explosive rarely and for short durations only. This document supplements the requirements in EN 13463-1 the contents of which apply in full
30、to equipment constructed in accordance with this document. Equipment complying with this standard meets the requirements of Group II Category 3 equipment. The type of ignition protection described in this standard is unsuitable for use in combination with another type of protection to produce equipm
31、ent of any other category than category 3. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amen
32、dments) applies. EN 13463-1:2001, Non-electrical equipment for potentially explosive atmospheres Part 1: Basic method and requirements. 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 13463-1:2001 and the following apply. protection by flow restrictin
33、g enclosure type of ignition protection which, by means of an enclosure, reduces the probability of ingress of a surrounding explosive atmosphere into the enclosure to an acceptably low level so that the concentration inside the enclosure is below the lower explosive limit 4 General 4.1 General requ
34、irements The requirements of this document apply in addition to the requirements of EN 13463-1. Flow restricting enclosures used to protect Group II Category 3 equipment may contain ignition sources which occur during normal operation provided the enclosure itself is not an ignition source. The type
35、 of protection shall not be used if the ignition source is an open flame. 4.2 Determination of suitability The equipment manufacturers ignition hazard assessment required by EN 13463-1 shall have determined that protection by flow restricting enclosure is appropriate to achieve the level of protecti
36、on required by Group II Category 3 equipment. NOTE Equipment manufacturer means the manufacturer who applies flow restricting enclosures to protect the equipment that may contain ignitions sources under normal operation. It is not the manufacturer of the empty enclosure. EN 13463-2:2004 (E) 6 5 Spec
37、ific requirements and limitations 5.1 Nature of ignition source Protection by flow restricting enclosures may be applied in the following circumstance: a) Enclosures containing mechanical sparks, and other ignition sources in normal operation but with a limitation in dissipated power such that the a
38、veraged air temperature within the enclosure does not exceed the external ambient temperature by more than 10 K. However the internal air temperature may exceed the external ambient temperature by up to 20 K if the rate of temperature decay, when the apparatus is de-energized, is limited to not more
39、 than 10 K/h; The effects of changes in weather conditions e.g. the suns direct heating on the exterior of the enclosure or rapid cooling by rain showers shall be taken into account. These can cause a larger temperature change than the 10 K allowed. b) Where an enclosure is provided with “anti-frost
40、“ or “anti-condensation“ heating, the 10 K and 20 K temperature rise in a) may apply above the internal non-operating temperature with the heating in operation, provided that the source of energy for the heating is independent of the main source of power for the enclosure. It is essential that simul
41、taneous loss of heating and removal of functional power is unlikely. If the “anti-frost“ or “anti-condensation“ heating raises the internal temperature more than 10 K (or 20 K with not more than 10 K/h decay) above the external ambient, the instructions supplied with the equipment shall require that
42、 the operator of the equipment is satisfied that the equipment is free of hazardous atmosphere before the heating is reapplied following a shut-down. NOTE The use of flow restricting enclosure to protect against ignition from sparks and other permanent ignition sources is not allowed where, because
43、of high internal temperatures, there is an increased risk of drawing the hazardous atmosphere into the enclosure when the apparatus is de-energised. Protection by flow restricting enclosure shall not be used in conjunction with any other type of ignition protection listed in EN 13463-1. Flow restric
44、ting enclosures are not suitable for equipment operated on a short time duty cycle because of the increased probability that the equipment might be de-energised when a flammable gas or vapour surrounds the enclosure. 5.2 Test requirements Flow restricting enclosures shall comply with Clause 6. Any g
45、asket or special part necessary to comply with the criteria shall be supplied with the enclosure and shall be subjected to the pre-conditioning described in 6.1 before subjected to the test specified in 6.2. 5.3 Enclosures without the provision for carrying out checks after installation Flow restric
46、ting enclosures without the provision for carrying out checks after installation or maintenance shall be type tested including the entries for pipes, shafts etc. These enclosures shall meet the requirements of 6.2.2. The installation instruction provided with the enclosure shall contain information
47、on proper sealing of the entries. 5.4 Enclosures with provisions for carrying out checks after installation Provisions shall be made for carrying out checks to ensure that the requirements for flow restricting enclosures are complied with after installation or after maintenance. The enclosures shall
48、 meet the requirements of 6.2.1. The installation instruction provided with the enclosure shall contain information on proper checking of the enclosure after installation and maintenance. EN 13463-2:2004 (E) 7 5.5 Resilient gaskets Resilient gasket seals shall be positioned so that they are not subj
49、ect to mechanical and/or chemical damage under normal operating conditions and they shall retain their sealing properties over the expected life of the equipment. Alternatively the manufacturer shall recommend a nominated replacement frequency. Environmental conditions shall be taken into account. 5.6 Poured seals and encapsulating compounds Poured seals and encapsulating compounds shall have a continuous operating temperature at least 10 K higher that occurring when op
