1、BRITISH STANDARDBS EN 13463-2:2004Non-electricalequipment for use in potentially explosive atmospheres Part 2: Protection by flow restricting enclosure frThe European Standard EN 13463-2:2004 has the status of a British StandardICS 13.230g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g4
2、4g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58Licensed Copy: Wang Bin, na, Sun Oct 09 02:10:53 BST 2005, Uncontrolled Copy, (c) BSIBS EN 13463-2:2004This British Standard was published under the authority of
3、the Standards Policy and Strategy Committee on 22 July 2005 BSI 22 July 2005ISBN 0 580 46126 2National forewordThis 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/23, Fire precautions in in
4、dustrial 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 international and European
5、 developments and promulgate them in the UK.A list of organizations represented on this committee can be obtained on request to its secretary.Cross-referencesThe British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue un
6、der 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 responsible for its correct app
7、lication.Compliance with a British Standard does not of itself confer immunity from legal obligations.Summary of pagesThis 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 in this document indicates when the
8、 document was last issued.Amendments issued since publicationAmd. No. Date CommentsLicensed Copy: Wang Bin, na, Sun Oct 09 02:10:53 BST 2005, Uncontrolled Copy, (c) BSIEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 13463-2November 2004ICS 13.230English versionNon-electrical equipment for use in p
9、otentially explosiveatmospheres - Part 2: Protection by flow restricting enclosure frAppareils non lectriques destins tre utiliss enatmosphres explosibles - Partie 2: Protection parenveloppe circulation limite frNicht-elektrische Gerte fr den Einsatz inexplosionsgefhrdeten Bereichen - Teil 2: Schutz
10、 durchschwadenhemmende Kapselung frThis 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 EuropeanStandard the status of a national standard without any alteration. Up-to-d
11、ate lists and bibliographical references concerning such nationalstandards 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 translationunder the r
12、esponsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Irel
13、and, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Br
14、ussels 2004 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 13463-2:2004: ELicensed Copy: Wang Bin, na, Sun Oct 09 02:10:53 BST 2005, Uncontrolled Copy, (c) BSIEN 13463-2:2004 (E) 2Contentspage Foreword3Introduction .41 Scope 52 Norm
15、ative references 53 Terms and definitions .54 General54.1 General requirements54.2 Determination of suitability 55 Specific requirements and limitations.65.1 Nature of ignition source 65.2 Test requirements65.3 Enclosures without the provision for carrying out checks after installation65.4 Enclosure
16、s with provisions for carrying out checks after installation65.5 Resilient gaskets75.6 Poured seals and encapsulating compounds 75.7 Internal fans or similar devices75.8 Limits of operation.76 Verifications and tests 76.1 Preconditioning for seals and gaskets used to maintain the flow restricting ef
17、fect76.2 Tests76.2.1 Equipment with provisions for checking of flow restricting properties 76.2.2 Equipment without provisions for checking of flow restricting properties.76.2.3 Equipment where the nominal volume of the enclosure changes due to pressure .86.2.4 Routine production test 87 Instruction
18、s for use .88 Marking .8Annex ZA (informative) Clauses of this European Standard addressing essential requirements or other provisions of EU Directives9Bibliography 13Licensed Copy: Wang Bin, na, Sun Oct 09 02:10:53 BST 2005, Uncontrolled Copy, (c) BSIEN 13463-2:2004 (E) 3Foreword This document (EN
19、13463-2:2004) has been prepared by Technical Committee CEN/TC 305 “Potentially explosive atmospheres - Explosion prevention and protection”, the secretariat of 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
20、 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 under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Dire
21、ctive 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 Standard consists of the following parts: EN 13463-1, Non-electrical equipment for potentially explosive atmospheres - Part 1: Basic method and r
22、equirements.EN 13463-2, Non-electrical equipment for use in potentially explosive atmospheres - Part 2: Protection by flow restricting enclosure “fr“.prEN 13463-3, Non-electrical equipment for potentially explosive atmospheres - Part 3: Protection by flameproof enclosure d.EN 13463-5, Non-electrical
23、 equipment intended for use in potentially explosive atmospheres - Part 5: Protection by constructional safety “c“.prEN 13463-6, Non-electrical equipment for potentially explosive atmospheres - Part 6: Protection by control of ignition source b.EN 13463-8, Non-electrical equipment for potentially ex
24、plosive atmospheres - Part 8: Protection by liquid immersion k. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, Franc
25、e, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Licensed Copy: Wang Bin, na, Sun Oct 09 02:10:53 BST 2005, Uncontrolled Copy, (c) BSIEN 13463-2:2004 (
26、E) 4Introduction 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. If such an enclosure is effectively sealed, but not necessarily
27、 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 place if there is a pressure difference across them. Such pressur
28、e 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 enclosures can prevent a surrounding explosive atmosphere from reachin
29、g 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 explosive rarely and for short durations only. For this reaso
30、n their use is restricted to the fulfilment of category 3 requirements. This document is a type B standard as described in EN 1070.Licensed Copy: Wang Bin, na, Sun Oct 09 02:10:53 BST 2005, Uncontrolled Copy, (c) BSIEN 13463-2:2004 (E) 51 Scope This document specifies the requirements for the constr
31、uction and testing of 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
32、 which apply in full 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 protect
33、ion to produce equipment 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 documen
34、t (including any amendments) 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. protectio
35、n by flow restricting enclosuretype 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 Gener
36、al 4.1 General requirements 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 igniti
37、on source. The type 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 th
38、e level of protection 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. Licensed
39、Copy: Wang Bin, na, Sun Oct 09 02:10:53 BST 2005, Uncontrolled Copy, (c) BSIEN 13463-2:2004 (E) 65 Specific 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, a
40、nd other ignition sources in normal operation but with a limitation in dissipated power such that the averaged 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
41、up to 20 K if the rate of temperature decay, when the apparatus is de-energized, is limited to not more 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 caus
42、e a larger temperature change than the 10 K allowed. b) Where an enclosure is provided with “anti-frost“ 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 f
43、or the heating is independent of the main source of power for the enclosure. It is essential that simultaneous 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
44、 K/h decay) above the external ambient, the instructions supplied with the equipment shall require that 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 p
45、rotect against ignition from sparks and other permanent ignition sources is not allowed where, because 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 n
46、ot be used in conjunction with any other type of ignition protection listed in EN 13463-1. Flow restricting 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 surro
47、unds the enclosure. 5.2 Test requirements Flow restricting enclosures shall comply with Clause 6. Any gasket 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 specifi
48、ed in 6.2. 5.3 Enclosures without the provision for carrying out checks after installation Flow restricting 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 req
49、uirements of 6.2.2. The installation instruction provided with the enclosure shall contain information 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 meet the requirements of 6.2.1. The installation instruction provided with the enclosure shall contain information on proper checking of the en
