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1、BRITISH STANDARD BS ISO 2942:2004 Hydraulic fluid power Filter elements Verification of fabrication integrity and determination of the first bubble point ICS 23.100.60 ? Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 06:53:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 2942:2004 This B
2、ritish Standard was published under the authority of the Standards Policy and Strategy Committee on 7 December 2004 BSI 7 December 2004 ISBN 0 580 45000 7 National foreword This British Standard reproduces verbatim ISO 2942:2004 and implements it as the UK national standard. It supersedes BS ISO 294
3、2:1994 which is withdrawn. The UK participation in its preparation was entrusted by Technical Committee MCE/18, Fluid power systems and components, to Subcommittee MCE/18/-/6, Contamination control, which has the responsibility to: A list of organizations represented on this subcommittee can be obta
4、ined on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI E
5、lectronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers
6、to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document
7、comprises a front cover, an inside front cover, the ISO title page, pages ii and v, a blank page, pages 1 to 7 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy: s
8、heffieldun sheffieldun, na, Sun Nov 26 06:53:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Reference number ISO 2942:2004(E) OSI 4002 INTERNATIONAL STANDARD ISO 2942 Fourth edition 2004-08-15 Hydraulic fluid power Filter elements Verification of fabrication integrity and determination of the first b
9、ubble point Transmissions hydrauliques lments filtrants Vrification de la conformit de fabrication et dtermination du point de premire bulle BS ISO 2942:2004 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 06:53:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI IS:2492 O4002(E) DPlcsid Fremia ihT
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15、06, Uncontrolled Copy, (c) BSI IS:2492 O4002(E) I SO 4002 All irthgs ersedevr iii Contents Page Forewordiv Introduction v 1 Scope1 2 Normative references .1 3 Terms and definitions.1 4 Apparatus and materials2 5 Test methods.3 5.1 General procedure 3 5.2 Verification of fabrication integrity (absenc
16、e of air bubbles).4 5.3 Determination of the first bubble point.4 6 Data presentation5 7 Identification statement5 Annex A (normative) Test report for verification of filter element fabrication integrity and determination of first bubble point .6 Bibliography .7 BS ISO 2942:2004 Licensed Copy: sheff
17、ieldun sheffieldun, na, Sun Nov 26 06:53:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 2942:2004(E) iv I SO 4002 All irthgs ersedevr Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing
18、 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 to be represented on that committee. International organizations, governmental and non-governmental, in liais
19、on with ISO, also take part in the work. ISO collaborates closely with the International 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 te
20、chnical committees is to prepare International Standards. Draft International Standards 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 dr
21、awn 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. ISO 2942 was prepared by Technical Committee ISO/TC 131, Fluid power systems, Subcommittee SC 6, Contamination contr
22、ol. This fourth edition cancels and replaces the third edition (ISO 2942:1994) which has been technically revised. BS ISO 2942:2004 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 06:53:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI IS:2492 O4002(E) I SO 4002 All irthgs ersedevr v Introduction
23、 In hydraulic fluid power systems, power is transmitted and controlled through a liquid under pressure within an enclosed circuit. Filters maintain fluid cleanliness by removing insoluble contaminants. The ability of a filter to achieve and maintain the required level of performance depends, among o
24、ther parameters, upon its filtration rating and structural integrity. Any imperfections in the structure, either through poor manufacturing techniques or lack of strength, will allow bypassing of unfiltered fluid. The integrity of the element after manufacture can be evaluated using a non-destructiv
25、e filter integrity test. This test determines whether flaws are present which would allow the fluid to bypass the filtering process and provides for quality control. The test is also used to evaluate whether damage has been sustained by the element during both service and laboratory tests. The first
26、 bubble point test is used for investigative product development and/or production process evaluation. The acceptability of filtration performance cannot be determined by the first bubble point test. BS ISO 2942:2004 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 06:53:38 GMT+00:00 2006, Unc
27、ontrolled Copy, (c) BSI blank Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 06:53:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI INTENRATIONAL TSANDADR IS:2492 O4002(E) I SO 4002 All irthgs ersedevr 1 Hydraulic fluid power Filter elements Verification of fabrication integrity and determinati
28、on of the first bubble point 1 Scope This International Standard specifies a bubble-point test method applicable to filter elements used in hydraulic fluid power systems. It can be used either to verify the fabrication integrity of a filter element (by checking the absence of bubbles) or to permit t
29、he localization of the largest pore of the filter element by determining the first bubble point. Verification of fabrication integrity defines the acceptability of the filter elements for further use or testing. The first bubble point is established through continuation of the fabrication integrity
30、test. It is under no circumstances a functional characteristic of a filter element; in particular, it cannot be used for extrapolation to the concepts of filtration rating, efficiency or retention capacity and should be used for information only. 2 Normative references The following referenced docum
31、ents 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 5598, Fluid power systems and components Vocabulary ISO 6295, Petroleum pro
32、ducts Mineral oils Determination of interfacial tension of oil against water Ring method. 3 Terms and definitions For the purposes of this International Standard, the definitions given in ISO 5598 and the following apply. 3.1 filter element porous device that performs the actual process of filtratio
33、n NOTE This definition differs from that given in ISO 5598, which reads: “The component which ensures the retention of contaminant.” 3.2 fabrication integrity physical acceptability of a filter element to meet the specification designated by the filter manufacturer 3.3 first bubble point pressure at
34、 which the first bubble stream appears when a filter element is tested using the method specified in this International Standard NOTE In the absence of manufacturing defects, this value is indicative of the largest pore of the filtering medium. BS ISO 2942:2004 Licensed Copy: sheffieldun sheffieldun
35、, na, Sun Nov 26 06:53:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI IS:2492 O4002(E) 2 I SO 4002 All irthgs ersedevr 4 Apparatus and materials 4.1 Bubble-point testing apparatus, as shown in Figure 1, is comprised of the elements 4.1.1 to 4.1.5: 4.1.1 Compressed-air supply, with filter(s) and press
36、ure regulator(s), adjustable up to 10 kPa (100 mbar). 4.1.2 Pressure-measuring device, with an accuracy of 5 % of the reading. 4.1.3 Temperature-measuring device, with an accuracy of 0,5 C. 4.1.4 Test container, for submerging the filter element under test. 4.1.5 Device, for restraining the filter e
37、lement during immersion to the required depth and allowing rotation about the elements major axis either manually or with an automatic mechanism. 4.2 Test liquid The test liquid shall be clean propan-2-ol (isopropyl alcohol or IPA) or an alternative liquid designated by the filter element manufactur
38、er. Its cleanliness shall be consistent with subsequent test requirements. Its surface tension shall be regularly checked in accordance with the requirements of ISO 6295. It is advisable to renew the liquid when its surface tension varies by 15 % from the original value. If the test element has been
39、 exposed to other hydraulic fluids prior to being subjected to the fabrication integrity test, then it is permissible to use the same type of hydraulic fluid as the fabrication integrity test liquid, provided that the requirements of 4.2 are met. If this is not possible, all residual previous liquid
40、 shall be removed by appropriate means before testing. This is to ensure correct and consistent wetting of the elements media. Test data can be compared only between tests that have used the same type of test liquid at equal testing conditions. BS ISO 2942:2004 Licensed Copy: sheffieldun sheffieldun
41、, na, Sun Nov 26 06:53:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI IS:2492 O4002(E) I SO 4002 All irthgs ersedevr 3 Dimensions in millimetres Key 1 compressed air supply 2 compressed air filter 3 pressure regulator 4 test container 5 test liquid 6 thermometer 7 filter element under test 8 pressure
42、-measuring device Figure 1 Typical bubble-point testing apparatus 5 Test methods WARNING Exercise care when using solvents with low flash points, as there could be a risk of fire or explosion. Appropriate precautions should be taken to avoid inhalation of fumes from these solvents. Always use suitab
43、le protective equipment. Attention is drawn to local health and safety procedures. 5.1 General procedure 5.1.1 Check that the manufacturers identification number or part number of the filter element to be tested complies with the manufacturers specification. 5.1.2 Install the clean filter element in
44、 the bubble-point testing apparatus (see 4.1), with the major axis of the filter element parallel to the surface of the test liquid (see 4.2). BS ISO 2942:2004 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 06:53:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 2942:2004(E) 4 I SO 4002 All
45、irthgs ersedevr 5.1.3 Submerge the filter element in the test liquid, which shall be at a temperature of (22 5) C. 5.1.4 Allow the filter element to remain submerged in the test liquid for 5 min before proceeding, to ensure that the filter element media fibres are wetted. The filter element may be s
46、oaked in the test container (4.1.4) prior to its being secured in the restraining device (4.1.5). If soaking is carried out while the filter element is secured in the restraining device, ensure that no pressure is applied to the filter during the soaking period. 5.1.5 Ensure that the lines connectin
47、g the pressure-measuring device (4.1.2) to the rest of the apparatus are void of liquid. 5.2 Verification of fabrication integrity (absence of air bubbles) 5.2.1 Apply just enough air pressure to the inside of the filter element to clear any lines of test liquid and to pressurize the element. If nec
48、essary, readjust the depth of the test liquid covering the element to (12 3) mm above the top of the filter media. 5.2.2 After the pressure stabilizes, rotate the element around its major axis and gradually increase the pressure in a minimum of four suitable increments for example, 100 Pa (1 mbar).
49、Allow the element at least one rotation of 360 at each increment while checking for evidence of bubbles. Continue increasing the pressure until the value designated by the filter manufacturer is reached. NOTE Air bubbles might be trapped on or within the outer structure of the filter element, resulting in a few spurious bubbles. These bubbles can be ignored. A steady stream of bubbles from the filter element at or below the manufactur