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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 ? Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29
2、 09:21:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 13463-2:2004 This British Standard was published under 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
3、version of EN 13463-2:2004. The UK participation in its preparation was entrusted to Technical Committee FSH/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 e
4、nquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related 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
5、British Standards which implement international or European publications referred to in this document may be 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
6、 Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible 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, a
7、n 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 document was last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 09:21:13 GMT+00:0
8、0 2006, Uncontrolled Copy, (c) BSI EUROPEAN 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: Protection by flow restricting enclosure fr Appareils non lectriques destins tre ut
9、iliss 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 This European Standard was approved by CEN on 14 October 2004. CEN members are boun
10、d 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 Ce
11、ntral 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 into its own language and notified to the Central Secretariat has the same status a
12、s 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, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, S
13、pain, 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 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN nationa
14、l Members. Ref. No. EN 13463-2:2004: E Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 09:21:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 13463-2:2004 (E) 2 Contents page Foreword3 Introduction.4 1Scope 5 2Normative references5 3Terms and definitions .5 4General5 4.1General requirements5
15、4.2Determination of suitability 5 5Specific requirements and limitations.6 5.1Nature of ignition source 6 5.2Test requirements6 5.3Enclosures without the provision for carrying out checks after installation6 5.4Enclosures with provisions for carrying out checks after installation6 5.5Resilient gaske
16、ts7 5.6Poured seals and encapsulating compounds 7 5.7Internal fans or similar devices7 5.8Limits of operation.7 6Verifications and tests 7 6.1Preconditioning for seals and gaskets used to maintain the flow restricting effect7 6.2Tests7 6.2.1Equipment with provisions for checking of flow restricting
17、properties7 6.2.2Equipment without provisions for checking of flow restricting properties.7 6.2.3Equipment where the nominal volume of the enclosure changes due to pressure.8 6.2.4Routine production test 8 7Instructions for use .8 8Marking.8 Annex ZA (informative) Clauses of this European Standard a
18、ddressing essential requirements or other provisions of EU Directives9 Bibliography13 Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 09:21:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 13463-2:2004 (E) 3 Foreword This document (EN 13463-2:2004) has been prepared by Technical Committee CEN
19、/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 by endorsement, at the latest by May 2005, and conflictin
20、g 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 Directive 94/9/EC of 23 March 1994. For relationship with EU D
21、irective(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 requirements. EN 13463-2, Non-electrical equipment for use
22、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 equipment intended for use in potentially explosive at
23、mospheres - 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 explosive atmospheres - Part 8: Protection by liquid im
24、mersion 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
25、 Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 09:21:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 13463-2:2004 (E) 4 Introduction An explosive
26、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 gas-tight, it can be assumed
27、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 pressure differences may be caused by
28、 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 reaching ignition sources inside them
29、. 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 reason their use is restricted to t
30、he fulfilment of category 3 requirements. This document is a type B standard as described in EN 1070. Licensed Copy: sheffieldun sheffieldun, na, Sun Oct 29 09:21:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 13463-2:2004 (E) 5 1 Scope This document specifies the requirements for the construction
31、 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 whic
32、h 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 protection t
33、o 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 document (in
34、cluding 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. protection by
35、 flow restricting 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
36、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 ignition
37、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 the l
38、evel 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 Cop
39、y: sheffieldun sheffieldun, na, Sun Oct 29 09:21:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 13463-2:2004 (E) 6 5 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
40、mechanical sparks, and 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 amb
41、ient temperature by 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 acc
42、ount. These can cause 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 th
43、e source of energy for 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 w
44、ith not more than 10 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 restri
45、cting enclosure to protect 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 restricti
46、ng enclosure shall not 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
47、 gas or vapour surrounds 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
48、 to the test specified 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 enclosure
49、s shall meet the requirements 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