07-30163579-DC.pdf

a Date: 1 June 2007 Origin: European Latest date for receipt of comments: 30 September 2007 Project no.: 2007/00625 Responsible committee: PH/4 Respiratory protection Interested committees: PH/4 Title: Draft BS EN 13274-7 Respiratory protective devices - Methods of test Part 7: Determination of particle filter penetration Supersession information: If this document is published as a standard, the UK implementation of it will supersede NONE and partially supersede. NONE If you are aware of a current national standard which may be affected, please notify the secretary (contact details below). WARNING: THIS IS A DRAFT AND MUST NOT BE REGARDED OR USED AS A BRITISH STANDARD. THIS DRAFT IS NOT CURRENT BEYOND 30 September 2007. This draft is issued to allow comments from interested parties; all comments will be given consideration prior to publication. No acknowledgement will normally be sent. See overleaf for information on commenting. 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Cross-references The British Standards which implement International or European publications referred to in this draft may be found via the British Standards Online Service on the BSI web site http:/www.bsi-global.com. Direct tel: 020 8996 7164 Responsible Committee Secretary: Mr John Fisher (BSI) E-mail: john.fisherbsi-global.com Draft for Public Comment Head Office 389 Chiswick High Road London W4 4AL Telephone: +44(0)20 8996 9000 Fax: +44(0)20 8996 7001 Form 36 Version 7.0 DPC: 07/30163579 DC Licensed Copy: London South Bank University, London South Bank University, Sun Jun 17 07:00:39 GMT+00:00 2007, Uncontrolled Copy, (c) BSI b Introduction This draft standard is based on European discussions in which the UK has taken an active part. Your comments on this draft are welcome and will assist in the preparation of the consequent British Standard. If no comments are received to the contrary, then the UK will approve this draft and implement it as a British Standard. 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Amend to read . so that the mains connector to which no connection . 6.4 Paragraph 2 te The use of the UV photometer as an alternative cannot be supported as serious problems have been encountered in its use in the UK. Delete reference to UV photometer. Microsoft and MS-DOS are registered trademarks, and Windows is a trademark of Microsoft Corporation. Licensed Copy: London South Bank University, London South Bank University, Sun Jun 17 07:00:39 GMT+00:00 2007, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM FINAL DRAFT prEN 13274-7 May 2007 ICS 13.340.30 English Version Respiratory protective devices - Methods of test - Part 7: Determination of particle filter penetration Appareils de protection respiratoire - Methode d'essai - Partie 7 : Détermination de la pénétration de filtres à particules Atemschutzgeräte - Prüfverfahren - Teil 7: Bestimmung des Durchlasses von Partikelfiltern This draft European Standard is submitted to CEN members for unique acceptance procedure. It has been drawn up by the Technical Committee CEN/TC 79. If this draft becomes a European Standard, 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. This draft European Standard was established by CEN 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 CEN Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and shall not be referred to as a European Standard. EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels © 2007 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. prEN 13274-7:2007: E Licensed Copy: London South Bank University, London South Bank University, Sun Jun 17 07:00:39 GMT+00:00 2007, Uncontrolled Copy, (c) BSI prEN 13274-7:2007 (E) 2 Contents Page Foreword3 Introduction.4 1 Scope 5 2 Normative references5 3 Terms and definitions .5 4 Pre-requisites.5 5 Test requirements6 5.1 General6 5.2 Penetration test6 5.3 Exposure test.6 5.4 Storage test7 6 Sodium chloride test method.7 6.1 Principle7 6.2 Test equipment 7 6.3 Test conditions 8 6.4 Procedure .8 6.5 Calculation of the penetration9 7 Paraffin oil test method.9 7.1 Principle9 7.2 Test equipment 9 7.3 Test conditions at filter .10 7.4 Procedure .10 7.5 Calculation of the penetration11 Annex A (normative) Test results - Uncertainty of measurements17 Annex ZA (informative) Relationship between this European Standard and the Essential Requirements of EU Directives18 Licensed Copy: London South Bank University, London South Bank University, Sun Jun 17 07:00:39 GMT+00:00 2007, Uncontrolled Copy, (c) BSI prEN 13274-7:2007 (E) 3 Foreword This document (prEN 13274-7:2007) has been prepared by Technical Committee CEN/TC 79 “Respiratory protective devices”, the secretariat of which is held by DIN. This document is currently submitted to the Unique Acceptance Procedure. 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 89/106/EEC. For relationship with EU Directive, see informative Annex ZA, which is an integral part of this document. Licensed Copy: London South Bank University, London South Bank University, Sun Jun 17 07:00:39 GMT+00:00 2007, Uncontrolled Copy, (c) BSI prEN 13274-7:2007 (E) 4 Introduction This European Standard is intended as a supplement to the specific device standards for respiratory protective devices. Test methods are specified for complete or parts of devices. If deviations from the test method given in this standard are necessary, these deviations will be specified in the relevant device standard. Licensed Copy: London South Bank University, London South Bank University, Sun Jun 17 07:00:39 GMT+00:00 2007, Uncontrolled Copy, (c) BSI prEN 13274-7:2007 (E) 5 1 Scope This European Standard specifies the procedure for testing particle filter penetration for respiratory protective devices. 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 132:1998, Respiratory protective devices Definitions of terms and pictograms EN 13274-5, Respiratory protective devices Methods of test Part 5: Climatic conditions 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 132:1998 apply. 4 Pre-requisites In order to implement this Part of EN 13274, at least the following parameters need to be specified in the appropriate device standard: items to be tested; number of samples; test method(s); flow rate through the filter; sequence of conditioning phases, where more than one is required; specification of any observations to be carried out; sample preparation and orientation; sample holding; in the case of the exposure test, the specified mass of test aerosol; pass/fail criteria; any deviations from this method. Licensed Copy: London South Bank University, London South Bank University, Sun Jun 17 07:00:39 GMT+00:00 2007, Uncontrolled Copy, (c) BSI prEN 13274-7:2007 (E) 6 5 Test requirements 5.1 General Unless otherwise specified, the values stated in this European Standard are expressed as nominal values. Except for temperature limits, values which are not stated as maxima or minima shall be subject to a tolerance of ± 5 %. Unless otherwise specified the ambient temperature for testing shall be in the range between 16 °C and 32 °C and the temperature limits shall be subject to an accuracy of ± 1 °C. Two test aerosols are used for measurement of filter penetration: a) Sodium Chloride, using the equipment described in Clause 6: b) Paraffin Oil, using the equipment described in Clause 7. NOTE Laboratories should give consideration to the following factors: Test chamber should be designed to minimise air velocity variations across the surface of the filter under test. Localised high air velocity (“jets”), may result inartificially high filter penetration. Paraffin oil used for testing should not have been exposed to heating and compressed air for a long period of time, as this may alter the composition of the oil, possibly causing inaccurate results. Replacement of paraffin oil in the test rig should be done every 3 months. The test aerosol is fed into the test chamber, where the particle filtering device under test is mounted under a leaktight manner on a suitable adaptor. Aerosol is passed through the device and the aerosol concentration is measured immediately before and after the particle filtering device by the photometer. 5.2 Penetration test The measurement of penetration, according to 5.1, shall be taken as the average over a time of (30 + 3) s, beginning 3 min after the start of the aerosol test. 5.3 Exposure test Penetration shall be recorded throughout the test at sample intervals not exceeding 5 min. NOTE Continuous recording of penetration is recommended. For particle filtering devices being tested using paraffin oil, continue the test until the particle filtering device has been exposed to the specified mass of the test aerosol as defined in the appropriate device standard. For particle filtering devices being tested using sodium chloride, continue the test until the particle filtering device has been exposed to the specified mass of the test aerosol as defined in the appropriate device standard, unless: a) for single shift use particle filtering devices, the penetration shows continued decline for 5 min or 5 sample intervals, whichever is the greater; b) for re-useable particle filtering devices, the penetration shows continued decline for 5 min or 5 sample intervals, whichever is the greater, and the maximum penetration is lower than when tested using paraffin oil test aerosol. If these conditions are met, the exposure test may be terminated early. Report the maximum penetration during exposure. Licensed Copy: London South Bank University, London South Bank University, Sun Jun 17 07:00:39 GMT+00:00 2007, Uncontrolled Copy, (c) BSI prEN 13274-7:2007 (E) 7 5.4 Storage test For re-useable particle filtering devices the storage test shall be performed immediately after the completion of the exposure test. Remove the particle filtering device from the penetration test chamber and store the particle filtering device in accordance with EN 13274-5, for a duration of (24 ± 1) h under ambient conditions as described in 3.1 of EN 13274-5, ensuring that particle filtering devices are not in contact with each other. The particle filtering device shall not be removed from the suitable adaptor if this may result in damage to the device. After storage, immediately repeat the penetration test according to 5.2. 6 Sodium chloride test method 6.1 Principle An aerosol of sodium chloride particles is generated by atomising an aqueous solution of the salt and evaporating the water. The concentration of this aerosol is measured before and after the filter under test by means of flame photometry. Accurate determinations are possible in the range 0,001 % to 100 % filter penetration. When an alternative design of test equipment to that given in 6.2 is used, it shall be correlated directly with this reference method and shall be shown to be equivalent over the whole of the operational range. 6.2 Test equipment The apparatus is shown schematically in Figure 1. The aerosol is generated by using a Collison atomizer filled with a 1 % solution of s