1、BRITISH STANDARDBS EN 50381:2004IncorporatingCorrigendum No. 1Transportableventilated rooms with or without an internal source of releaseThe European Standard EN 50381:2004 has the status of a British StandardICS 29.260.20 BS EN 50381:2004This British Standard was published under the authority of th
2、e Standards Policy and Strategy Committee on 7 January 2005 BSI August 2006ISBN 0 580 45307 3 National forewordThis British Standard is the official English language version of EN 50381:2004, including Corrigendum December 2005.The UK participation in its preparation was entrusted by Technical Commi
3、ttee GEL/31, Electrical apparatus for explosive atmospheres, to Subcommittee GEL/31/17, Pressurization and other techniques, which has the responsibility to:A list of organizations represented on this subcommittee can be obtained on request to its secretary.Cross-referencesThe British Standards whic
4、h implement international or European publications referred to in this document may be found in the BSI Catalogueunder the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online.This publicatio
5、n 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. aid enquirers to understand the text; present to the responsible European committe
6、e any enquiries 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.Summary of pagesThis document comprises a front cover, an inside front cover, the EN title page,pages 2 to 42 and
7、a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date Comments16153Corrigendum No. 1August 2006 Revision of EN foreword and contents. Addition of Annex ZZ.EUROPEAN STANDARD EN 50381NORME EUROPENNE
8、 EUROPISCHE NORM August 2004 CENELECEuropean Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2004 CENELEC - All rights of exploitation in any for
9、m and by any means reserved worldwide for CENELEC members. Ref. No. EN 50381:2004 E ICS 29.260.20 Incorporates Corrigendum December 2005English version Transportable ventilated rooms with or without an internal source of release Caissons ventils transportables avec ou sans source de dgagement intern
10、eTransportable ventilierte Rume mit oder ohne innere Freisetzungsstelle This European Standard was approved by CENELEC on 2004-03-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a nationa
11、l 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 three official versions (English, French, German). A version in a
12、ny 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 electrotechnical committees of Austria, Belgium, Cyprus, Czech Republic, Den
13、mark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 50381:2004 - 2 - Foreword This European Standard was prepared by WG 31
14、-73, of SC 31-7, Pressurization and other techniques, of the Technical Committee CENELEC TC 31, Electrical apparatus for explosive atmospheres. The text of the draft was submitted to the Unique Acceptance Procedure and was approved by CENELEC as EN 50381 on 2004-03-01. The following dates were fixed
15、: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2005-03-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2007-03-01 This standard covers the essential requi
16、rements for pressurized rooms without an internal source of release and the additional requirements when an internal source of release is present. This European Standard was prepared under mandate BC/CEN/CLC/08-92 given to CENELEC by the European Commission and the European Free Trade Association an
17、d covers essential requirements of the EC Directive 94/9/EC. See Annex ZZ.This European Standard is to be read in conjunction with EN 50014, Electrical apparatus for potentially explosive atmospheres General requirements, or where appropriate, with EN 50021, Electrical apparatus for potentially expl
18、osive atmospheres Type of protection “n”. This European Standard should not be considered in conjunction with any editions of these standards and their amendments published before 1997.- 3 - EN 50381:2004 ContentsPage 1 Scope.62 Normative references .63 Definitions 74 Construction requirements for T
19、VRs and ducting .104.1 General .104.2 Degree of ingress protection .104.3 Design and construction 114.4 Mechanical strength 114.5 Penetrations114.6 Floor drains.114.7 Floors114.8 Doors 114.9 Inspection window(s).124.10 Apertures 124.11 Enclosures 125 Requirements for TVRs, equipment group I, type of
20、 protection vM2 .126 Ventilation requirements for TVRs, equipment group II 137 Additional ventilation requirements for TVRS with an internal source of release.148 Temperature limits149 Minimum safety provisions and devices 1410 Additional safety provisions and devices for TVRs meeting the requiremen
21、ts of type of protection v2 and vM2 1611 Additional requirements for TVRs with an internal source of release1711.1 Assessment of containment systems 1711.2 Release conditions 1711.2.1 No release.1711.2.2 Release of a flammable liquid1711.3 Design requirements for the containment system 1711.3.1 Infa
22、llible parts of the containment system 1811.3.2 Containment system with limited release .1811.4 Ignition capable apparatus in the case of type of protection v2 1811.5 Location of apparatus in the case of type of protection v3 .1811.6 Internal hot surfaces1911.6.1 Loss of minimum pressure differentia
23、l, type of protection v21911.6.2 Loss of ventilation flow, type of protection v2.1911.6.3 Loss of ventilation flow, type of protection v3.1911.7 Potential source of internal release .1912 Requirements for gas detectors1913 Supply of protective gas .2013.1 Ventilation .2013.2 Leakage Compensation of
24、a Breathable Atmosphere (LCBA) 2113.3 Density limits.21EN 50381:2004 - 4 - 14 Type verification and tests2114.1 Sequence of tests .2114.2 Thermal tests 2214.3 Overpressure test2214.4 Purging test.2214.5 Verification of minimum pressure differential .2314.6 Ventilation flow rate tests for TVRs with a
25、n internal source of release 2314.7 Overpressure test for containment systems with limited release 2314.8 Verification of sequence of operation of the safety devices2314.9 Additional tests2415 Routine tests 2415.1 Test conditions2415.2 Verification of minimum pressure differential .2415.3 Ventilatio
26、n flow rate tests for TVRs with an internal source of release 2415.4 Overpressure test for containment systems with limited release 2415.5 Verification of sequence of operation of the safety devices2415.6 Additional tests2516 Marking 2516.1 TVRs all cases .2516.2 TVRs with a containment system 2516.
27、3 Safety related control systems.2516.4 Additional marking.2517 Instructions.26Annex A (normative) Method of protection of electrical apparatus containing a potential release of a flammable gas or vapour .27A.1 Introduction .27A.2 Definitions .27A.3 Requirements27Annex B (normative) Method of protec
28、tion of electrical apparatus containing a potential release of a flammable liquid 30B.1 Introduction .30B.2 Definitions .30B.3 Requirements30B.4 Flammable non-flashing liquids .31B.5 Spark and particle barriers 32B.6 Flashing liquids .33Annex C (informative) Determination of peak rise in enclosure p
29、ressure, resulting from an internal release of a flashing liquid34C.1 Introduction .34C.2 Definitions .34Annex D (informative) Method of protection of electrical apparatus containing a potential release of a flammable gas or vapour .36Annex E (informative) Mathematical model of dilution of a source
30、of release .38Annex ZZ (informative) Coverage of Essential Requirements of EC Directives.41Bibliography.42- 5 - EN 50381:2004 Introduction This is a new European Standard for transportable pressurized rooms with and without an internal source of release but is confined to those rooms which are trans
31、portable and should not apply to rooms constructed on site and not intended for resale. Pressurized rooms are locations intended for human occupation under normal operational circumstances. In such circumstances it is important to distinguish between pressurization, which may use air or inert gas an
32、d be applied to apparatus not required to support life, from ventilation. Ventilation in the context of this standard, taken together with other safety measures, ensures a safe (and breathable) atmosphere within the pressurized room. This text is based upon the scope of EN 61285, IEC/TR 61831, IEC 6
33、0079-13 and IEC 60079-16 and the essential safety requirements of Directive 94/9/EC. EN 50381:2004 - 6 - 1 Scope 1.1 This European Standard contains the specific requirements for the construction and testing of transportable ventilated rooms (TVRs), such as skid mounted analyser houses with type of
34、protection v intended for use in potentially explosive atmospheres. Transportable in this sense means manufactured in one location (the manufacturers premises) for trade and transportation to another location (the users premises) for installation and use. This European Standard supplements European
35、Standard EN 50014 or where appropriate EN 50021, the requirements of which apply to electrical apparatus with type of protection v except as modified within this standard. This standard does not contain the requirements for equipment group II, category 1 or equipment group I, category M1. This stand
36、ard does not contain the requirements for equipment group I, category M2 where there exists a potential source of release. This standard does not contain the requirements for group II where there exists a potential hazard from combustible dusts. NOTE It is not the intention of this European Standard
37、 to cover stationary analyzer houses according to EN 61285. 1.2 This European Standard includes the requirements for the construction of the TVR and its associated components including, the inlet and outlet apertures for the ventilation gas supply and for the safety provisions and devices necessary
38、for the type of protection v. 1.3 This European Standard specifies the requirements for TVRs with or without an internal source of release of potentially flammable or toxic, gas, liquid or vapour (for example analyzers placed within the TVR). 1.4 Due to the safety factors incorporated in the type of
39、 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 apparatus with the requiremen
40、ts of this standard. 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 amendments) applies. EN 95
41、4-1 Safety of machinery - Safety related parts of control systems EN 50014 Electrical apparatus for potentially explosive atmospheres General requirements EN 50015 Electrical apparatus for potentially explosive atmospheres Oil immersion o EN 50016 Electrical apparatus for potentially explosive atmos
42、pheres Pressurized apparatus p EN 50017 Electrical apparatus for potentially explosive atmospheres Powder filling q EN 50018 Electrical apparatus for potentially explosive atmospheres Flame proof enclosures d EN 50019 Electrical apparatus for potentially explosive atmospheres Increased safety e EN 5
43、0020 Electrical apparatus for potentially explosive atmospheres Intrinsic safety i - 7 - EN 50381:2004 EN 50021 Electrical apparatus for potentially explosive atmospheres Type of protection n EN 50028 Electrical apparatus for potentially explosive atmospheres Encapsulation m EN 50039 Electrical appa
44、ratus for potentially explosive atmospheres Intrinsically safe electrical systems i EN 60034-5 Rotating electrical machines - Part 5: Degrees of protection provided bythe integral design of rotating electrical machines (IP code) Classification (IEC 60034-5) EN 60079-10 1996 Electrical apparatus for
45、explosive gas atmospheres Part 10: Classification of hazardous areas (IEC 60079-10:1995) EN 60079-15 2003 Electrical apparatus for explosive gas atmospheres Part 15: Type of protection “n” (IEC 60079-15:2001, modified) EN 60529 Degrees of protection provided by enclosures (IP Code) (IEC 60529) EN 61
46、285 Industrial-process control Safety of analyser houses (IEC 61285) EN 61779-1 Electrical apparatus for the detection and measurement of flammable gases Part 1: General requirements and test methods (IEC 61779-1:1998, modified) EN 61779-2 Electrical apparatus for the detection and measurement of co
47、mbustible gases Part 2: Performance requirements for Group I apparatus indicating a volume fraction up to 5 % methane in air (IEC 61779-2:1998, modified) EN 61779-3 Electrical apparatus for the detection and measurement of flammable gases Part 3: Performance requirements for Group I apparatus indica
48、ting a volume fraction up to 100 % methane in air (IEC 61779-3:1998, modified) EN 61779-4 Electrical apparatus for the detection and measurement of combustible gases Part 4: Performance requirements for Group II apparatus indicating a volume fraction up to 100 % lower explosive limit (IEC 61779-4:19
49、98, modified) EN 61779-5 Electrical apparatus for the detection and measurement of combustible gases Part 5: Performance requirements for Group II apparatus indicating a volume fraction up to 100 % gas (IEC 61779-5:1998, modified) 3 Definitions For the purpose of this standard, the following definitions apply: 3.1purging the operation of passing a specified quantity of air through the TVR, or apparatus as defined in Annex A, and its associated ducts, so that any explosive gas or
