1、BS ISO16889:2008ICS 23.100.60NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDHydraulic fluid power Filters Multi-passmethod for evaluatingfiltration performanceof a filter elementThis British Standardwas published under theauthority of the StandardsPolicy and St
2、rategyCommittee on 30 BSI 2008ISBN 978 0 580 55034 8Amendments/corrigenda issued since publicationDate CommentsBS ISO 16889:2008National forewordThis British Standard is the UK implementation of ISO 16889:2008. Itsupersedes BS ISO 16889:1999 which is withdrawn.The UK participation in its preparation
3、 was entrusted to TechnicalCommittee MCE/18/-/6, Contamination control.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible for its correct applic
4、ation.Compliance with a British Standard cannot confer immunityfrom legal obligations.September2008BS ISO 16889:2008Reference numberISO 16889:2008(E)ISO 2008INTERNATIONAL STANDARD ISO16889Second edition2008-06-15Hydraulic fluid power Filters Multi-pass method for evaluating filtration performance of
5、 a filter element Transmissions hydrauliques Filtres valuation des performances par la mthode de filtration en circuit ferm BS ISO 16889:2008ISO 16889:2008(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed b
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8、se by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. COPYRIGHT PROTECTED DOCUMENT ISO 2008 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in
9、 any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22
10、 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2008 All rights reservedBS ISO 16889:2008ISO 16889:2008(E) ISO 2008 All rights reserved iiiContents Page Foreword iv Introduction v 1 Scope 1 2 Normative references 1 3 Terms and definitions .2 4 Symbols 3 5 General p
11、rocedures.5 6 Test equipment 5 7 Measuring instrument accuracy and test condition variations 6 8 Filter performance test circuit validation procedures .7 8.1 Filter test system validation .7 8.2 Validation of contaminant injection system .8 9 Summary of information required prior to testing .9 10 Pr
12、eliminary preparation 9 10.1 Test filter assembly .9 10.2 Contaminant injection system10 10.3 Filter test system .11 11 Filter performance test12 12 Calculations13 13 Data presentation.15 14 Identification statement (reference to this International Standard) 16 Annex A (normative) Base test-fluid pr
13、operties 19 Annex B (informative) Test system design guide 21 Annex C (informative) Examples of report calculations and graphs .26 Annex D (informative) Summary of data from the round robin test programme conducted to verify the procedure in this International Standard.34 Bibliography 41 BS ISO 1688
14、9:2008ISO 16889:2008(E) iv ISO 2008 All rights reservedForeword ISO (the International Organization for Standardization) 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.
15、 Each member body interested in a subject for which a technical committee has been established has the right 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 Interna
16、tional Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Stan
17、dards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subje
18、ct of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 16889 was prepared by Technical Committee ISO/TC 131, Fluid power systems, Subcommittee SC 6, Contamination control. This second edition cancels and replaces the first edition (ISO 16889:1999),
19、6.3 and Annex A of which have been technically revised, Annex A by the deletion of detailed round-robin data. BS ISO 16889:2008ISO 16889:2008(E) ISO 2008 All rights reserved vIntroduction In hydraulic fluid power systems, one of the functions of the hydraulic fluid is to separate and lubricate the m
20、oving parts of the components. The presence of solid particulate contamination produces wear, resulting in loss of efficiency, reduced component life and subsequent unreliability. A hydraulic filter is provided to control the number of particles circulating within the system to a level that is comme
21、nsurate with the degree of sensitivity of the components to the contaminant and the level of reliability required by the users. To enable the comparison of the relative performance of filters so that the most appropriate filter can be selected, it is necessary that test procedures be available. The
22、performance characteristics of a filter are a function of the element (its medium and geometry) and the housing (its general configuration and seal design). In practice, a filter is subjected to a continuous flow of contaminant entrained in the hydraulic fluid until some specified terminal different
23、ial pressure (relief-valve cracking pressure or differential-pressure indicator setting) is reached. Both the length of operating time (prior to reaching terminal pressure) and the contaminant level at any point in the system are functions of the rate of contaminant addition (ingression plus generat
24、ion rates) and the performance characteristics of the filter. Therefore, it is necessary that a realistic laboratory test to establish the relative performance of a filter provide the test filter with a continuous supply of ingressed contaminant and allow the periodic monitoring of the filtration pe
25、rformance characteristics of the filter. It is also necessary that the test provide an acceptable level of repeatability and reproducibility, and a standard test contaminant, the ISO medium test dust (ISO MTD) in accordance with ISO 12103-1, be featured. This product has been shown to have a consist
26、ent particle-size distribution and is available worldwide. The filtration performance of the filter is determined by measurement of the upstream and downstream particle-size distributions using automatic particle counters validated to ISO standards. This test is intended to differentiate filter elem
27、ents according to their functional performance but is not intended to represent performance under actual field operating conditions. Test conditions are steady-state, and the dynamic characteristics of industrial hydraulic systems are not represented. Other test protocols exist or are in development
28、 to evaluate performance with cyclic flow, high viscosity, flow fatigue, etc. BS ISO 16889:2008BS ISO 16889:2008INTERNATIONAL STANDARD ISO 16889:2008(E) ISO 2008 All rights reserved 1Hydraulic fluid power Filters Multi-pass method for evaluating filtration performance of a filter element 1 Scope Thi
29、s International Standard describes the following: a) a multi-pass filtration performance test with continuous contaminant injection for hydraulic fluid power filter elements; b) a procedure for determining the contaminant capacity, particulate removal and differential pressure characteristics; c) a
30、test currently applicable to hydraulic fluid power filter elements that exhibit an average filtration ratio greater than or equal to 75 for particle sizes u 25 m(c), and a final reservoir gravimetric level of less than 200 mg/L; NOTE It is necessary to determine by validation the range of flow rates
31、 and the lower particle size limit that can be used in test facilities. d) a test using ISO medium test dust contaminant and a test fluid in accordance with Annex A. This International Standard is intended to provide a test procedure that yields reproducible test data for appraising the filtration p
32、erformance of a hydraulic fluid power filter element without influence of electrostatic charge. This International Standard applies to three test conditions: test condition 1, with a base upstream gravimetric level of 3 mg/L; test condition 2, with a base upstream gravimetric level of 10 mg/L; test
33、condition 3, with a base upstream gravimetric level of 15 mg/L. 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 documen
34、t (including any amendments) applies. ISO 1219-1, Fluid power systems and components Graphic symbols and circuit diagrams Part 1: Graphic symbols for conventional use and data-processing applications ISO 2942, Hydraulic fluid power Filter elements Verification of fabrication integrity and determinat
35、ion of the first bubble point ISO 3722, Hydraulic fluid power Fluid sample containers Qualifying and controlling cleaning methods ISO 3968, Hydraulic fluid power Filters Evaluation of differential pressure versus flow characteristics ISO 4021, Hydraulic fluid power Particulate contamination analysis
36、 Extraction of fluid samples from lines of an operating system ISO 4405, Hydraulic fluid power Fluid contamination Determination of particulate contamination by the gravimetric method BS ISO 16889:2008ISO 16889:2008(E) 2 ISO 2008 All rights reservedISO 5598, Fluid power systems and components Vocabu
37、lary ISO 5725 (all parts), Accuracy (trueness and precision) of measurement methods and results ISO 11171:1999, Hydraulic fluid power Calibration of automatic particle counters for liquids ISO 11943:1999, Hydraulic fluid power On-line automatic particle-counting systems for liquids Methods of calibr
38、ation and validation ISO 12103-1:1997, Road vehicles Test dust for filter evaluation Part 1: Arizona test dust 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 5598 and the following apply. 3.1 contaminant mass injected mass of specific particulate co
39、ntaminant injected into the test circuit to obtain the terminal differential pressure 3.2 differential pressure p difference between the tested component inlet and outlet pressure as measured under the specified conditions NOTE See Figure 1 for a graphical depiction of differential pressure terms. 3
40、.2.1 clean assembly differential pressure difference between the tested component inlet and outlet pressures as measured with a clean filter housing containing a clean filter element 3.2.2 clean element differential pressure differential pressure of the clean element calculated as the difference bet
41、ween the clean assembly differential pressure and the housing differential pressure 3.2.3 final assembly differential pressure assembly differential pressure at the end of a test, equal to the sum of the housing plus the terminal element differential pressures 3.2.4 housing differential pressure dif
42、ferential pressure of the filter housing without an element 3.2.5 terminal element differential pressure maximum differential pressure across the filter element as designated by the manufacturer to limit useful performance 3.3 rest conductivity electrical conductivity at the initial instant of curre
43、nt measurement after a d.c. voltage is impressed between electrodes NOTE It is the reciprocal of the resistance of uncharged fluid in the absence of ionic depletion or polarization. BS ISO 16889:2008ISO 16889:2008(E) ISO 2008 All rights reserved 33.4 retained capacity mass of the specific particulat
44、e contaminant effectively retained by the filter element when the terminal element differential pressure is reached Key X test time or mass injected 3 clean element differential pressure Y differential pressure 4 housing differential pressure 1 final assembly (end of test) differential pressure 5 cl
45、ean assembly differential pressure 2 terminal element differential pressure Figure 1 Differential pressure conventions for multi-pass test 4 Symbols 4.1 The graphic symbols used are in accordance with ISO 1219-1. 4.2 The letter symbols used in this International Standard are shown in Table 1. BS ISO
46、 16889:2008ISO 16889:2008(E) 4 ISO 2008 All rights reservedTable 1 Letter symbols Symbol Unit Description or explanation u,xAparticles per millilitre Overall average upstream count of particles larger than size x d,xAparticles per millilitre Overall average downstream count of particles larger than
47、size x bc milligrams per litre Average base upstream gravimetric level cb milligrams per litre Desired base upstream gravimetric level ic milligrams per litre Average injection gravimetric level ci milligrams per litre Desired injection gravimetric level c80milligrams per litre Test reservoir gravim
48、etric level at 80 % assembly differential pressure m grams Mass of contaminant needed for injection megrams Estimated filter element contaminant capacity (mass injected) migrams Contaminant mass injected mpgrams Contaminant mass injected at element differential pressure mRgrams Retained capacity n N
49、umber of counts in specific time period Nu,x,jparticles per millilitre Number of upstream particles larger than size x at count j Nd,x,jparticles per millilitre Number of downstream particles larger than size x at count j u, ,x tNparticles per millilitre Average upstream count of particles larger than size x at time interval t d, ,x tNparticles per millilitre Average downstream count of particles larger than size x at time interval t p pascals or kilopascals (bar) Pressure p pasc
