1、BSI Standards PublicationBS EN ISO 16891:2016Test methods for evaluatingdegradation of characteristicsof cleanable filter media (ISO16891:2016)BS EN ISO 16891:2016 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO16891:2016.The UK participation in its preparat
2、ion was entrusted to TechnicalCommittee MCE/21, Filters for gases and liquids.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correct
3、application. The British Standards Institution 2016. Published by BSI StandardsLimited 2016ISBN 978 0 580 82646 7ICS 91.140.30Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Co
4、mmittee on 31 March 2016.Amendments issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 16891 February 2016 ICS 91.140.30 English Version Test methods for evaluating degradation of characteristics of cleanable filter media (ISO 16891:2016) Mthodes dessa
5、is pour lvaluation de la dgradation des proprits des medias filtrants dcolmatables (ISO 16891:2016) Prfmethode zur Ermittlung der Abnahme der Wirksamkeit von abreinigbaren Filtermedien (ISO 16891:2016) This European Standard was approved by CEN on 7 November 2015. CEN members are bound to comply wit
6、h 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-CENELEC Manag
7、ement 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-CENELEC Management Centre has the same sta
8、tus as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malt
9、a, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey andUnited Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2016 CEN
10、All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 16891:2016 EBS EN ISO 16891:2016EN ISO 16891:2016 (E) 3 European foreword This document (EN ISO 16891:2016) has been prepared by Technical Committee ISO/TC 142 “Cleaning equipment for
11、 air and other gases“ in collaboration with 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 lat
12、est by August 2016, and conflicting national standards shall be withdrawn at the latest by August 2016. 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 su
13、ch patent rights. 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, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Mace
14、donia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 16891:2016 has been approved by CE
15、N as EN ISO 16891:2016 without any modification. BS EN ISO 16891:2016ISO 16891:2016(E)Foreword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 14 Symbols and abbreviated terms . 45 Principle 56 Test specimen, equipment and test procedure . 66.1 General . 66.2 Preparation
16、 of sheets for gas exposure 76.2.1 Shape and size of tensile specimen 76.2.2 Sample sheet for exposure 76.2.3 Selection of sample sheet through air permeability measurement . 86.2.4 Filter media for exposure . 86.3 Sample preparation 96.3.1 Exposure system 96.3.2 Heating system .116.3.3 Test gas sup
17、ply system.116.3.4 Gas analyzer 116.3.5 Gas treatment device .126.4 Exposure conditions and procedures . 126.4.1 Exposure conditions 126.4.2 Exposure period and number of exposure .126.4.3 Attachment of filter sample sheets in the sample case 136.4.4 Implementation of the exposure .137 Tensile stren
18、gth measurement of exposed specimen .147.1 Tensile test device . 147.2 Preparation of a tensile test specimen 147.3 Method of tensile test . 147.4 Characterization of the degradation 158 Test report 16Annex A (informative) Causes and results of degradation of fabrics.17Annex B (informative) Possible
19、 evaluation method for characteristic change of fabrics 18Annex C (informative) Theoretical consideration of degradation mechanism .19Annex D (informative) Determination of specimen size .22Annex E (informative) Experimental setup for gas exposure.26Annex F (informative) Service temperature of filte
20、r materials 30Annex G (informative) Examples of measured data of fabric at different circumstances 31Annex H (informative) Example of test report 37Bibliography .41 ISO 2016 All rights reserved iiiContents PageBS EN ISO 16891:2016ISO 16891:2016(E)ForewordISO (the International Organization for Stand
21、ardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right
22、to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures us
23、ed to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules
24、of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identifie
25、d during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on th
26、e meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/T
27、C 142, Cleaning equipment for air and other gases.iv ISO 2016 All rights reservedBS EN ISO 16891:2016ISO 16891:2016(E)IntroductionThe main purpose of using cleanable filter is, of course, to separate dust particles from dirty gases. They are usually designed to be usable for as long as two years to
28、four years. However, it is very hard to design and/or select filter media properly, since their important characteristics of collection performance and residual pressure drop change with operation time. Physical and chemical properties of filter media, such as degradation in tensile strength, tenaci
29、ty and so on, also change with time. Those changes can damage filter media and this can result in the breakage of bag filters and leakage of dust to the atmosphere. Hence the evaluation of these performances is also important for the rational design and the selection of appropriate filter media. ISO
30、 11057:2011 has been published to meet the demand for the evaluation of filtration characteristics.Changes in physical and chemical properties of filter media are caused by many factors, such as heat, corrosive gases, and mechanical reasons like clogging weave openings and increasing size of weave o
31、penings, the combination of those factors and so on (see Annex A). These changes are mostly adverse effects to filter media. Degradation proceeds very slowly, and thus, it takes a long time before recognizable and/or measurable change appears. Furthermore, the appearance of change depends on the com
32、bination of causes and fibre material. These facts are the main reason why mechanism of property changes has not been well understood despite its practical importance.1-13Hence, the characterization or evaluation methods for filter media have not been established yet1415(see Annex B).Nevertheless, t
33、here are demands for the establishment of a guideline for systematic characterization and evaluation of property change of filter media with respect to their relevant long-time operation not only from manufacturers of filter media, but also from producers and users of filter installations, especiall
34、y the users treating combustion exhaust gases.To evaluate degradation of filter media in a laboratory, it is important that experiment can be done in a relatively short time period by using controllable single or a small number of variables, i.e. causes of change.Furthermore, it is important that th
35、e resulting effects are measureable. From this point of view, heat intensity is controllable by changing heating temperature and the intensity of corrosive gas is also controllable by changing gas concentration. Thus, their effect is expected to be accelerated. Of course, the effects can be evaluate
36、d by the degradation of tensile stress.Evaluation of property change of filter media by corrosive gases can be done by contacting filter media with those corrosive materials in any phases, i.e. gas, liquid and solid state. Testing by dipping filter media into a solution of corrosive materials is eas
37、y and the resulting effects are expected to be obtained in a short period of time. Chinese Standard, GB/T 6719:2009 adopts this method.16 Solid state testing can be carried out by hard contact of filter media but it will take a long time and it is very hard to control the intensity of corrosiveness.
38、Testing under the gaseous state takes much longer than a liquid type test but the intensity of corrosiveness is controllable and it is much easier than the test under the solid state. Furthermore, test temperature and gas conditions except corrosive gas concentrations, are similar to the actual oper
39、ation condition of filtration, which is suitable (see Annex B). Hence, in this International Standard, test methods for evaluating degradation characteristics of cleanable unwoven filter media with synthetic fibre by heat and corrosive gases are standardized because they are most widely used for bag
40、 filtration.The major objective of this International Standard is to specify the testing method to assess the relative change of physical performances of new and used cleanable filter media for industrial application, by exposing it in hot and/or corrosive gas conditions 1718. ISO 2016 All rights re
41、served vBS EN ISO 16891:2016BS EN ISO 16891:2016Test methods for evaluating degradation of characteristics of cleanable filter media1 ScopeThis International Standard specifies a standard reference test method useful to assess the relative degradation characteristics of cleanable filter media for in
42、dustrial applications under standardized simulated test conditions. The main purpose of testing is to obtain the information about relative change of properties of filter media due to exposure to the simulated gas conditions for a long time. The main target of this International Standard is the prop
43、erty change of nonwoven fabric filters because they are frequently used under similar circumstances to the test gas conditions described in this International Standard.The results obtained from this test method are not intended for predicting the absolute properties of full scale filter facilities.
44、However, they are helpful for the design of a bag filter and selection and development of appropriate cleanable filter media, and for the identification of suitable operating parameters.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document an
45、d 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.ISO 4606, Textile glass Woven fabrics Determination of tensile breaking force and e
46、longation at breaking by strip methodISO 13934-1, Textiles Tensile properties of fabrics Part 1: Determination of maximum force and elongation at maximum force using the strip method1)ISO 29464:2011,Cleaning equipment for air and other gases Terminology3 Terms and definitionsFor the purposes of this
47、 document, the terms and definitions given in ISO 29464:2011 and the following apply.3.1aged filter sheetfilter sheet exposed under simulated hot and corrosive gas conditions for a preset period of time to evaluate the change of filter properties3.2air permeabilitygas volume flow rate per unit filtr
48、ation area at pressure drop of 124,5 Pa3.3average gas concentrationmean concentration of test gases during the exposure1) This International Standard replaced ISO 5081, Textiles Woven fabrics Determination of breaking strength and elongation (Strip method).INTERNATIONAL STANDARD ISO 16891:2016(E) IS
49、O 2016 All rights reserved 1BS EN ISO 16891:2016ISO 16891:2016(E)3.4batch type exposure chamberchamber in which filter sheets are exposed to stationary test gas mixture3.5chemical degradationdegradation of chemical properties of filter media by the interaction with test gases3.6cleanable filterfilter designed to enable the removal of collected dust by appropriate techniqueSOURCE: ISO 29464:2011; 3.1.773.7continuous-flow-methodexposing method of filter sheet, which is exposed in a continuous flow of test gas mixture3.8corrosive gas
