EN 1822-4-2009 en High efficiency air filters (EPA HEPA and ULPA) - Part 4 Determining leakage of filter elements (scan method)《高效空气过滤器(EPA HEPA和ULPA) 第4部分 过滤元件泄漏性测定(扫描法)》.pdf

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1、BS EN1822-4:2009ICS 13.040.40; 23.120NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDHigh efficiency airfilters (EPA, HEPA andULPA)Part 4: Determining leakage of filterelements (scan method)This British Standard was published under the authority of the Standards

2、 Policy and Strategy Committee on 31 January2010 BSI 2010ISBN 978 0 580 61793 5Amendments/corrigenda issued since publicationDate CommentsBS EN 1822-4:2009National forewordThis British Standard is the UK implementation of EN 1822-4:2009. It supersedes BS EN 1822-4:2000 which is withdrawn.The UK part

3、icipation in its preparation was entrusted to Technical Committee MCE/21/3, Air filters other than for air supply for I.C. engines and compressors.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the ne

4、cessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.BS EN 1822-4:2009EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 1822-4 November 2009 ICS 13.040.40 Supersedes EN 1822-4:2000Engli

5、sh Version High efficiency air filters (EPA, HEPA and ULPA) - Part 4: Determining leakage of filter elements (scan method) Filtres air haute efficacit (EPA, HEPA et ULPA) - Partie 4: Essais dtanchit de llment filtrant (mthode dexploration) Schwebstofffilter (EPA, HEPA und ULPA) - Teil 4: Leckprfung

6、des Filterelementes (Scan-Verfahren) This European Standard was approved by CEN on 17 October 2009. 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-

7、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 un

8、der 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

9、, 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 COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management

10、 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 1822-4:2009: EBS EN 1822-4:2009EN 1822-4:2009 (E) 2 Contents Page Foreword 4Introduction 51 Scope .62 Normative references .63 Terms an

11、d definitions 64 Description of the procedure 75 Test filter 86 Test apparatus 86.1 Set-up of the test apparatus 86.2 Test duct . 116.2.1 Test air conditioning . 116.2.2 Adjustment of the volume flow rate . 116.2.3 Measurement of the volume flow rate . 116.2.4 Aerosol mixing duct 116.2.5 Test filter

12、 mounting assembly 116.2.6 Measuring points for the pressure difference 116.2.7 Sampling, upstream 116.2.8 Screening . 126.3 Scanning assembly . 126.3.1 General . 126.3.2 Sampling, downstream . 126.3.3 Probe arm . 136.3.4 Aerosol transport lines . 136.3.5 Provisions to move the probe 136.4 Aerosol g

13、eneration and measurement techniques 136.4.1 General . 136.4.2 Set-up for testing with a monodisperse test aerosol . 146.4.3 Set-up for testing with a polydisperse test aerosol . 147 Test air 148 Test procedure . 158.1 General . 158.2 Preparatory checks . 158.3 Starting up the aerosol generator 168.

14、4 Preparing the test filter . 168.4.1 Installing the test filter 168.4.2 Flushing the test filter . 168.5 Testing 168.5.1 Measuring the pressure drop . 168.5.2 Testing with monodisperse test aerosol . 178.5.3 Testing with polydisperse test aerosol . 178.5.4 Leak testing (local penetration) . 178.5.5

15、 Determining the mean efficiency of the filter element . 179 Evaluation . 189.1 Calculating the penetration and the efficiency . 189.2 Local penetration . 199.3 Mean efficiency 20BS EN 1822-4:2009EN 1822-4:2009 (E) 3 9.4 Classification 2010 Test report . 2011 Maintenance and inspection of the test a

16、pparatus . 21Annex A (normative) Oil Thread Leak Test . 23Annex B (normative) Determining the test parameters . 24B.1 General 24B.2 Boundary conditions 24B.3 Test filter data . 24B.4 Data for the apparatus . 25B.4.1 Particle counters 25B.4.2 Downstream sampling probes 25B.4.3 Loss factor 26B.5 Seque

17、nce of calculation steps 26B.6 Checking the isokinetic sampling 27B.7 Choosing the probe speed 28B.8 Minimum aerosol concentration . 29B.9 Maximum aerosol concentration 30B.10 Leak signal 31B.10.1 Effective value 31B.10.2 Signal difference . 32Annex C (informative) Example of an application with eva

18、luation . 34Annex D (informative) Leak Test with solid PSL Aerosol 37D.1 Background . 37D.2 General Remarks 37D.3 Test Procedure . 37D.4 Test Protocol . 39Annex E (informative) 0,3 m 0,5 m Particle Efficiency Leak Test 40Bibliography . 42BS EN 1822-4:2009EN 1822-4:2009 (E) 4 Foreword This document (

19、EN 1822-4:2009) 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

20、 May 2010, and conflicting national standards shall be withdrawn at the latest by May 2010. 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 ri

21、ghts. This document supersedes EN 1822-4:2000. 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,

22、 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 elem

23、ents (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, Est

24、onia, 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. BS EN 1822-4:2009EN 1822-4:2009 (E) 5 Introduction As decided by CEN/

25、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 r

26、elationships, 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 m to 0,25 m. This method also allows to test ultra low penetration air filters, which was not possible with the previous test

27、methods because of their inadequate sensitivity. For Membrane and synthetic filter media, separate rules apply; see Annexes A and B of EN 1822-5:2009. BS EN 1822-4:2009EN 1822-4:2009 (E) 6 1 Scope This European Standard applies to efficient air filters (EPA), high efficiency air filters (HEPA) and u

28、ltra 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

29、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 conditio

30、ns 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 m - 0,5 m Particle Efficiency Leak Test” according to Annex E may be used al

31、ternatively 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 (

32、including any amendments) applies. EN 1822-1:2009, High efficiency air filters (EPA, HEPA and ULPA) Part 1: Classification, performance testing, marking EN 1822-2, High efficiency air filters (EPA, HEPA and ULPA) Part 2: Aerosol production, measuring equipment, particle counting statistics EN 1822-3

33、, High efficiency air filters (EPA, HEPA and ULPA) Part 3: Testing flat sheet filter media EN 1822-5:2009, 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 Fo

34、r 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

35、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

36、particles which are measured or which flow past a specified cross section in unit time BS EN 1822-4:2009EN 1822-4:2009 (E) 7 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 t

37、o test the filter element for local penetration values which exceed permissible levels (see EN 1822-1). 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 nomi

38、nal 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

39、 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 comp

40、onents 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 i

41、n 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 i

42、s 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

43、 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 (se

44、e 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 p

45、robe, 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 pa

46、rticles (see EN 1822-3), 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 usi

47、ng 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

48、 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. BS EN 1822-4:2009EN 1822-4:2009 (E) 8 If scan testing is carried out as an automatic procedure it also allows determination of the mean efficiency of the test filter from the measurement of the particle concentration. The mean particle concentration on the downstream side is calculated from the total particle numbe