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Högeffektiva luftfilter (EPA, HEPA och ULPA) Del 4: Bestämning av läckning hos filterelement (skanning-metoden) - PDF
Högeffektiva luftfilter (EPA, HEPA och ULPA) Del 4: Bestämning av läckning hos filterelement (skanning-metoden)
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1 SVENSK STANDARD SS-EN :2009 Fastställd/Approved: Publicerad/Published: Utgåva/Edition: 2 Språk/Language: engelska/english ICS: ; ; Högeffektiva luftfilter (EPA, HEPA och ULPA) Del 4: Bestämning av läckning hos filterelement (skanning-metoden) High efficiency air filters (EPA, HEPA and ULPA) Part 4: Determining leakage of filter elements (scan method) SWEDISH STANDARDS INSTITUTE
3 Europastandarden EN :2009 gäller som svensk standard. Detta dokument innehåller den officiella engelska versionen av EN :2009. Denna standard ersätter SS-EN , utgåva 1. The European Standard EN :2009 has the status of a Swedish Standard. This document contains the official English version of EN :2009. This standard supersedes the Swedish Standard SS-EN , edition 1. Copyright/Upphovsrätten till denna produkt tillhör SIS, Swedish Standards Institute, Stockholm, Sverige. Användningen av denna produkt regleras av slutanvändarlicensen som åter nns i denna produkt, se standardens sista sidor. Copyright SIS, Swedish Standards Institute, Stockholm, Sweden. All rights reserved. The use of this product is governed by!the end-user licence for this product. You will nd the licence in the end of this document. Upplysningar om sakinnehållet i standarden lämnas av SIS, Swedish Standards Institute, telefon Standarder kan beställas hos SIS Förlag AB som även lämnar allmänna upplysningar om svensk och utländsk standard. Information about the content of the standard is available from the Swedish Standards Institute (SIS), tel Standards may be ordered from SIS Förlag AB, who can also provide general information about Swedish and foreign standards. SIS Förlag AB, SE Stockholm, Sweden. Tel: Fax: Internet:
5 EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM EN November 2009 ICS Supersedes EN :2000 English Version High efficiency air filters (EPA, HEPA and ULPA) - Part 4: Determining leakage of filter elements (scan method) Filtres à air à haute efficacité (EPA, HEPA et ULPA) - Partie 4: Essais d'étanchéité de l'élément filtrant (méthode d'exploration) Schwebstofffilter (EPA, HEPA und ULPA) - Teil 4: Leckprüfung des Filterelementes (Scan-Verfahren) This European Standard was approved by CEN on 17 October 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 references concerning such national standards may be obtained on application to the CEN Management Centre 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 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. EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2009 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN :2009: E
6 SS-EN EN :2009 (E) (E) Contents Page Foreword...4 Introduction Scope Normative references Terms and definitions Description of the procedure Test filter Test apparatus Set-up of the test apparatus Test duct Test air conditioning Adjustment of the volume flow rate Measurement of the volume flow rate Aerosol mixing duct Test filter mounting assembly Measuring points for the pressure difference Sampling, upstream Screening Scanning assembly General Sampling, downstream Probe arm Aerosol transport lines Provisions to move the probe Aerosol generation and measurement techniques General Set-up for testing with a monodisperse test aerosol Set-up for testing with a polydisperse test aerosol Test air Test procedure General Preparatory checks Starting up the aerosol generator Preparing the test filter Installing the test filter Flushing the test filter Testing Measuring the pressure drop Testing with monodisperse test aerosol Testing with polydisperse test aerosol Leak testing (local penetration) Determining the mean efficiency of the filter element Evaluation Calculating the penetration and the efficiency Local penetration Mean efficiency
7 EN SS-EN : :2009 (E) (E) Classification Test report Maintenance and inspection of the test apparatus Annex A (normative) Oil Thread Leak Test Annex B (normative) Determining the test parameters B.1 General B.2 Boundary conditions B.3 Test filter data B.4 Data for the apparatus B.4.1 Particle counters B.4.2 Downstream sampling probes B.4.3 Loss factor B.5 Sequence of calculation steps B.6 Checking the isokinetic sampling B.7 Choosing the probe speed B.8 Minimum aerosol concentration B.9 Maximum aerosol concentration B.10 Leak signal B.10.1 Effective value B.10.2 Signal difference Annex C (informative) Example of an application with evaluation Annex D (informative) Leak Test with solid PSL Aerosol D.1 Background D.2 General Remarks D.3 Test Procedure D.4 Test Protocol Annex E (informative) 0,3 μm 0,5 μm Particle Efficiency Leak Test Bibliography
8 SS-EN EN :2009 (E) (E) Foreword This document (EN :2009) has been prepared by Technical Committee CEN/TC 195 Air filters for general air cleaning, the secretariat of which is held by UNI. 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 2010, and conflicting national standards shall be withdrawn at the latest by May Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes EN :2000. It contains requirements, fundamental principles of testing and the marking for efficient particulate air filters (EPA), high efficiency particulate air filters (HEPA) and ultra low penetration air filters (ULPA). The complete European Standard EN 1822, High efficiency air filters (EPA, HEPA and ULPA) will consist of the following parts: Part 1: Classification, performance testing, marking Part 2: Aerosol production, measuring equipment, particle counting statistics Part 3: Testing flat sheet filter media Part 4: Determining leakage of filter elements (scan method) Part 5 : Determining the efficiency of filter elements According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: 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 the United Kingdom. 4
9 EN SS-EN : :2009 (E) (E) Introduction As decided by CEN/TC 195, this European Standard is based on particle counting methods which actually cover most needs of different applications. The difference between this European Standard and previous national standards lies in the technique used for the determination of the integral efficiency. Instead of mass relationships, this technique is based on particle counting at the most penetrating particle size (MPPS), which is for micro-glass filter mediums usually in the range of 0,12 μm to 0,25 μm. This method also allows to test ultra low penetration air filters, which was not possible with the previous test methods because of their inadequate sensitivity. For Membrane and synthetic filter media, separate rules apply; see Annexes A and B of EN :
10 SS-EN EN :2009 (E) (E) 1 Scope This European Standard applies to efficient air filters (EPA), high efficiency air filters (HEPA) and ultra low penetration air filters (ULPA-filters) used in the field of ventilation and air conditioning and for technical processes, e.g. for applications in clean room technology or pharmaceutical industry. It establishes a procedure for the determination of the efficiency on the basis of a particle counting method using an artificial test aerosol, and allows a standardized classification of these filters in terms of their efficiency. This part of EN 1822 applies to the leak testing of filter elements. The scan method which is described in detail regarding procedure, apparatus and test conditions in the body of this standard is valid for the complete range of group H and U filters and is considered to be the reference test method for leak determination. The Oil Thread Leak Test according to Annex A and the 0,3 μm - 0,5 μm Particle Efficiency Leak Test according to Annex E may be used alternatively but for defined classes of group H filters only. 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 :2009, High efficiency air filters (EPA, HEPA and ULPA) Part 1: Classification, performance testing, marking EN , High efficiency air filters (EPA, HEPA and ULPA) Part 2: Aerosol production, measuring equipment, particle counting statistics EN , High efficiency air filters (EPA, HEPA and ULPA) Part 3: Testing flat sheet filter media EN :2009, High efficiency air filters (EPA, HEPA and ULPA) Part 5: Determining the efficiency of filter elements EN 14799:2007, Air filters for general air cleaning Terminology 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 14799:2007 and the following apply. 3.1 total particle count method particle counting method in which the total number of particles in a certain sample volume is determined without classification according to size (e.g. by using a condensation nucleus counter) 3.2 particle counting and sizing method particle counting method which allows both the determination of the number of particles and also the classification of the particles according to size (e.g. by using an optical particle counter) 3.3 particle flow rate number of particles which are measured or which flow past a specified cross section in unit time 6
11 EN SS-EN : :2009 (E) (E) 3.4 particle flow distribution distribution of the particle flow over a plane at right angles to the direction of flow 4 Description of the procedure The leakage test serves to test the filter element for local penetration values which exceed permissible levels (see EN ). For leakage testing the test filter is installed in the mounting assembly and subjected to a test air flow corresponding to the nominal air flow rate. After measuring the pressure drop at the nominal volume flow rate, the filter is purged and the test aerosol produced by the aerosol generator is mixed with the prepared test air along a mixing duct so that it is spread homogeneously over the cross-section of the duct. The particle flow rate on the downstream side of the test filter is smaller than the particle flow rate reaching the filter on the upstream side by the factor mean penetration. The manufacturing irregularities of the filter material or leaks lead to a variation of the particle flow rate over the filter face area. In addition, leaks at the boundary areas and within the components of the test filter (sealant, filter frame, seal of the filter mounting assembly) can lead locally to an increase in the particle flow rate on the downstream side of the test filter. For the leakage test, the particle flow distribution shall be determined on the downstream side of the filter in order to check where the limit values are exceeded. The coordinates of these positions shall be recorded. The scanning tracks shall also cover the area of the filter frame, the corners, the sealant between filter frame and the gasket so that possible leaks in these areas can also be detected. It is advisable to scan filters for leaks with their original gasket mounted and in the same mounting position and air flow direction as they are installed on site. In order to measure the downstream particle flow distribution, a probe with defined geometry shall be used on the downstream side to take a specified partial flow as sample. From this partial flow, a sample volume flow rate shall be led to a particle counter which counts the particles and displays the results as a function of time. During the testing, the probe moves at a defined speed in touching or overlapping tracks without gaps (see B.4.2 and B.4.3) close to the downstream side of the filter element. The measuring period for the downstream particle flow distribution can be shortened by using several measuring systems (partial flow extractors/particle counters) operating in parallel. The measurement of the coordinates of the probe, a defined probe speed, and measurement of the particle flow rate at sufficiently short intervals allow the localisation of leaks. In a further test step, the local penetration shall be measured at this position using a stationary probe. The leakage tests shall always be conducted using MPPS particles (see EN ), except for filters with Membrane medium as per Annex E of this standard. The size distribution of the aerosol particles can be checked using a particle size analysis system (for example a differential mobility particle sizer, DMPS). The leakage testing can be carried out using either a monodisperse or polydisperse test aerosol. It shall be ensured that the median particle diameter corresponds to the MPPS particle diameter, at which the filter medium has its minimum efficiency. When testing with a monodisperse aerosol, the total particle counting method can be used with a condensation nucleus counter (CNC) or an optical particle counter (OPC; e.g. a laser particle counter). When using a polydisperse aerosol, an optical particle counter shall be used which counts the particles and measures their size distribution. 7
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