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1、BRITISH STANDARD BS ISO 2941:1974 Implementation of ISO 2941:1974 Hydraulic fluid power Filter elements Verification of collapse/burst resistance ICS 23.100.30 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 06:46:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 2941:1974 This British Sta
2、ndard, having been prepared under the direction of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15 November 1996 BSI 11-1998 The following BSI references relate to the work on this standard: Committee reference MCE/18 Draft for comme
3、nt 73/305404 DC ISBN 0 580 26754 7 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee MCE/18, Fluid power systems and components, upon which the following bodies were represented: Association of British Mining Equipment Comp
4、anies British Compressed Air Society British Fluid Power Association British Hydrodynamics Research Association Department of Trade and Industry (National Engineering Laboratory) Ministry of Defence University of Bath The following body was also represented in the drafting of the standard through Su
5、bcommittee MCE/18/11: Society of Motor Manufacturers and Traders Limited Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 06:46:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 2941:1974 BSI 11-1998i Contents Page Committee responsib
6、leInside front cover National forewordii Forewordii 0 Introduction1 1Scope and field of application1 2References1 3Definitions1 4Graphical symbols1 5Equipment1 6Procedure1 7Criteria for acceptance1 8Designated information1 9Identification statement1 Figure Sketch of typical collapse/burst test stand
7、2 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 06:46:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 2941:1974 ii BSI 11-1998 National foreword This British Standard reproduces verbatim ISO 2941:1974 and implements it as the UK national standard. This British Standard is published und
8、er the direction of the Engineering Sector Board whose Technical Committee MCE/18 has the responsibility to: aid enquirers to understand the text; present to the responsible international committee any enquiries on interpretation, or proposals for change, and keep UK interests informed; monitor rela
9、ted international and European developments and promulgate them in the UK. NOTEInternational and European Standards, as well as overseas standards, are available from Customer Services, BSI, 389 Chiswick High Road, London W4 4AL. A British Standard does not purport to include all the necessary provi
10、sions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the ISO title pa
11、ge, page ii, pages 1 and 2 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 06:46:51 GMT+00:00 2006, Uncontro
12、lled Copy, (c) BSI Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 06:46:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 2941:1974 ii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards institutes (ISO Member Bodies). The work
13、 of developing International Standards is carried out through ISO Technical Committees. Every Member Body interested in a subject for which a Technical Committee has been set up has the right to be represented on that Committee. International organizations, governmental and non-governmental, in liai
14、son with ISO, also take part in the work. Draft International Standards adopted by the Technical Committees are circulated to the Member Bodies for approval before their acceptance as International Standards by the ISO Council. International Standard ISO 2941 was drawn up by Technical Committee ISO/
15、TC 131, Fluid power systems and components, and circulated to the Member Bodies in November 1972. It has been approved by the Member Bodies of the following countries: No Member Body expressed disapproval of the document. AustraliaHungaryRomania AustriaIndiaSouth Africa, Rep. of BelgiumItalySweden B
16、razilJapanSwitzerland BulgariaMexicoThailand CzechoslovakiaNetherlandsTurkey FinlandNew ZealandUnited Kingdom FrancePolandU.S.A. GermanyPortugalU.S.S.R. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 06:46:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 2941:1974 BSI 11-19981 0 Introduc
17、tion 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 filter element is the porous device which performs the actual process of filtration. 1 Sco
18、pe and field of application This International Standard specifies a method for verifying the collapse/burst rating of a hydraulic fluid power filter element, i.e. the capability of the filter element to withstand a designated differential pressure at the normal (intended direction of) flow. 2 Refere
19、nces ISO/R 1219, Graphical symbols for hydraulic and pneumatic equipment and accessories for fluid power transmission. ISO 2942, Hydraulic fluid power Filter elements Determination of fabrication integrity. ISO 2943, Hydraulic fluid power Filter elements Verification of material compatibility. ISO 5
20、598, Fluid power systems and components Vocabulary. 3 Definitions For definitions of terms used, see ISO 5598. 4 Graphical symbols Graphical symbols used are in accordance with ISO/R 1219. 5 Equipment 5.1 Collapse/burst test stand as shown in the Figure. 5.2 Test filter housing (recommended by the f
21、ilter manufacturer) modified as needed to ensure that fluid cannot by-pass the filter element. 5.3 Fluid compatible with the filter element material, in accordance with ISO 2943. 5.4 For data accuracy, select and maintain measuring instruments so that data are accurate to within 5 %. 6 Procedure 6.1
22、 Subject the filter element to a fabrication integrity test in accordance with ISO 2942. 6.2 Disqualify from further testing any element failing to exhibit a minimum bubble pressure as specified by the manufacturer. 6.3 Install the filter housing in the collapse/burst test stand shown in the Figure.
23、 6.4 Determine the pressure drop across the empty filter housing at the manufacturers rated nominal flow at a test temperature in the range of 15 to 40 C. 6.5 Install the filter element in a test filter housing. 6.6 Subject the filter element to the manufacturers rated nominal flow at the test tempe
24、rature selected in 6.4. 6.7 Inject into the system a controlled (continuous or intermittent) amount of any inert particulate contaminant that does not add to the strength of the test element, while maintaining the rated nominal flow and test temperature. 6.8 Record the pressure drop across the filte
25、r as a function of contaminant (grams) added until the pressure drop across the element (filter assembly pressure drop minus housing pressure drop) reaches collapse/burst pressure rating. 6.9 Subject the filter element, after removing it from the test filter housing, to a further fabrication integri
26、ty test in accordance with ISO 2942. 6.10 Report operating conditions, type of contaminant and type of pump. 6.11 Void the test if the contaminant fills the filter housing. 7 Criteria for acceptance 7.1 No evidence of structural, seal, or filter medium failure, when tested by ISO 2942. 7.2 No decrea
27、se in slope of the “pressure drop versus contaminant added” curve. 8 Designated information Include the following designated information in documents referring to this International Standard: a) manufacturers nominal rated flow; b) collapse/burst pressure rating; c) direction of flow through the fil
28、ter element. 9 Identification statement (Reference to this International Standard) The use of the following statement in catalogues and sales literature prepared by those electing to comply with this International Standard is strongly recommended: “Filter element collapse/burst resistance determined
29、 in accordance with ISO 2941, Hydraulic fluid power Filter elements Verification of collapse/burst resistance.” Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 06:46:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 2941:1974 2 BSI 11-1998 Figure Sketch of typical collapse/burst test stand
30、 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 06:46:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI blank Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 06:46:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | |
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