1、 ISO 2016 Hydraulic spin-on filters with finite lives Method for verifying the rated fatigue life and the rated static burst pressure of the pressure-containing envelope Filtres hydrauliques visser ayant une dure de vie spcifie Mthode de vrification de la dure de vie nominale en fatigue et de la pre
2、ssion statique dclatement nominale de lenveloppe sous pression INTERNATIONAL STANDARD ISO 12829 First edition 2016-08-01 Reference number ISO 12829:2016(E) ISO 12829:2016(E)ii ISO 2016 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2016, Published in Switzerland All rights reserved. Unless oth
3、erwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
4、 below or ISOs member body in the country of the requester. ISO copyright office Ch. de Blandonnet 8 CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyrightiso.org www.iso.org ISO 12829:2016(E)Foreword iv Introduction v 1 Scope . 1 2 Normative references 1 3
5、Terms and definitions . 1 4 Samples 2 5 Cyclic endurance test to verify the rated fatigue life at a rated fatigue pressure 2 5.1 Test equipment . 2 5.2 Test conditions 3 5.3 Test procedure . 4 5.4 Failure criteria . 5 5.5 Calculation of rated fatigue life at rated fatigue pressure 5 5.6 Verification
6、 . 6 6 Burst test to verify the rated static burst pressure 6 6.1 Test equipment . 6 6.2 Test conditions 6 6.3 Test procedure . 6 6.4 Failure criteria . 7 6.5 Calculation of rated static burst pressure 7 6.6 Verification . 7 7 Presentation of data 7 8 Verification of rated fatigue life, rated fatigu
7、e pressure and rated static burst pressure by similarity . 8 9 Similarity between filters under test and production components 8 10 Identification statement (reference to this document) . 8 Annex A (informative) Results of the round robin test program conducted to verify the procedure specified in t
8、his document . 9 Bibliography .11 ISO 2016 All rights reserved iii Contents Page ISO 12829:2016(E) Foreword 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 c
9、arried 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 liaison with ISO, also take part in the wor
10、k. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the diff
11、erent approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules 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 m
12、ay 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 identified 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/pate
13、nts). 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 the meaning of ISO specific terms and expressions related to conformit y assessment, as well as information about ISOs adherence to the World Tra
14、de Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.html. The committee responsible for this document is ISO/TC 131, Fluid power systems, Subcommittee SC 6, Contamination control.iv ISO 2016 All rights reserved ISO 12829:2016(E) I
15、ntroduction In hydraulic fluid power systems, power is transmitted and controlled through a liquid under pressure within an enclosed circuit. A basic requirement of hydraulic fluid power components is that they should be capable of adequately containing the pressurized fluid. The pressure to which a
16、n individual component can normally be subjected has a relationship with the rated fatigue pressure and minimum burst pressure. This relationship can be estimated and used as a basis of total life expectancy for the component in an individual application. Such an estimate is applied by the user. Fac
17、tors such as shock, heat, misuse, etc., are to be judged by the user in each application. Selection of a specific pressure and life expectancy for a component in a particular application can be based upon the rated fatigue pressure and burst pressure as described in Figure 1. This finite life pressu
18、re rating test procedure differs from the (NFPA)T2.6.1 R2 infinite life pressure rating document (which is referred to in ISO/TR 10771-2) and can be visualized from the S-N diagram in Figure 1. (NFPA) T2.6.1 R2 is a rating system along the vertical axis, with its fatigue strength distribution and as
19、surance level in the vertical direction at a defined life. The finite life method described in this document is a rating system along the horizontal axis, with its fatigue life distribution and assurance level in the horizontal direction at a defined stress (pressure). Figure 1 Possible S-N curve me
20、thod for estimating finite life rating Because the service life of the element container for a finite life spin-on hydraulic filter is relatively short, a fatigue life of 100 000 cycles is judged sufficient for common industrial ratings. Ratings at levels other than 100 000 cycles are permitted; thi
21、s document may be applied for those cases. The method of rating includes both pressure and minimum life. The pressure rating of the filter head or mounting base can be subjected to the full 10 6fatigue cycles established by (NFPA)T2.6.1 R2. The spin-on housing, because of its construction, can be te
22、sted and evaluated as an elastic body with specific pressure cycle test times and pressure rise rate conditions. It needs to be noted that this document deals only with verifying the pressure ratings of spin-on filters. Separate from this verification procedure, manufacturers have the continuing res
23、ponsibility to use managerial controls necessary to test spin-on filters that are representative of production. ISO 2016 All rights reserved v Hydraulic spin-on filters with finite lives Method for verifying the rated fatigue life and the rated static burst pressure of the pressure-containing envelo
24、pe WARNING The use of this document can involve hazardous materials, operations and equipment. This document does not purport to address all of the safety concerns associated with its use. The user of this document is responsible, prior to its use, to establish appropriate safety and health practice
25、s and to determine the applicability of regulatory limitations. 1 Scope This document specifies methods for verifying the rated fatigue life and the rated static burst pressure of the pressure-containing envelope (i.e. the filter housing) of a spin-on hydraulic filter with a disposable filter elemen
26、t and a finite life. Because the service life of housings for these types of filters is relatively short, a rated fatigue life of 100 000 cycles is judged sufficient for typical industrial applications. 2 Normative references The following documents are referred to in the text in such a way that som
27、e or all of their content constitutes requirements 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 19972-1, Hydraulic fluid power Methods to assess the reliability of
28、 hydraulic components Part 1: General procedures and calculation method 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 5598 and the following apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses:
29、 IEC Electropedia: available at http:/ /www.electropedia.org/ ISO Online browsing platform: available at http:/ /www.iso.org/obp 3.1 rated fatigue life N f minimum life, expressed in cycles, with a specified assurance level, that a filter housing can sustain at a rated pressure 3.2 rated fatigue pre
30、ssure p fr pressure that a filter housing can sustain for a specific number of cycles without failure 3.3 rated static burst pressure p Br pressure that the pressure-containing envelope of a component can sustain without failure INTERNATIONAL ST ANDARD ISO 12829:2016(E) ISO 2016 All rights reserved
31、1 ISO 12829:2016(E) 3.4 spin-on filter filter assembly of which the filter element, housing and means of attaching are unitised into one inseparable part 4 Samples Two samples, each consisting of a minimum of six filters under test that are representative of normal production, shall be prepared. One
32、 of these samples shall be subjected to the cyclic endurance test and the other to the burst test. 5 Cyclic endurance test to verify the rated fatigue life at a rated fatigue pressure 5.1 Test equipment 5.1.1 Hydraulic test stand, that is capable of producing repeatable pressure impulses that confor
33、m to the requirements of 5.3.4. Figure 2 shows a circuit diagram of a typical test stand that can be used for this procedure. NOTE The actual cyclic test pressure exceeds the measured test pressure if the frequency response of the measurement system or its components is insufficient to reproduce the
34、 actual waveform, thereby penalizing the component under test.2 ISO 2016 All rights reserved ISO 12829:2016(E) Key 1 reservoir 7 outlet pressure control valve 2 pump 8 pressure gauge 3 filter under test 9 component controls 4 inlet pressure control valve 10 heat exchanger 5 solenoid valve 11 thermos
35、tat 6 solenoid valve Figure 2 Circuit diagram of typical test stand 5.1.2 Test liquid, MIF-PRF-5606H or a suitable non-corrosive hydraulic fluid. 5.1.3 Oscilloscope computerized recording system or light beam recorder with sufficient speed, to properly record the test waveform. 5.1.4 Pressure-measur
36、ing instrument, mounted directly into, or as close as possible to, the filter head or base through a pressurized port that is not being used to supply the test liquid. The pressure- measuring instrument shall not be installed in the line that supplies the test liquid to the test filter and shall be
37、set up and maintained so that pressure measurements are accurate within the limits specified in Table 1. If the test setup allows multiple filters to be tested simultaneously, pressure shall be measured at each filter under test, to ensure that each filter is subjected to the pressure impulsing. 5.1
38、.5 Thermometer, set up and maintained so that the temperature measured is accurate within the limits specified in Table 1. 5.2 Test conditions 5.2.1 Unless otherwise specified, the rated fatigue life for filters tested in accordance with this document is a minimum of 100 000 cycles. ISO 2016 All rig
39、hts reserved 3 ISO 12829:2016(E) 5.2.2 The test equipment shall maintain a uniform test fluid temperature of 50 C 10 C, unless otherwise specified. 5.2.3 The instruments used to measure test parameters shall provide the reading accuracy specified in Table 1. Variations in test conditions shall be ma
40、intained within the tolerances specified in Table 1. Table 1 Instrument accuracy and test condition variation Test condition SI unit Instrument accuracy tolerance on reading Allowed test condition variation Pressure kPa 2 % 3 % Test fluid temperature C 3 C 10 C Cycle rate Hz 10 % 5.3 Test procedure
41、5.3.1 Apply torque to all threaded items in accordance with the manufacturers recommendations. Document the torque installation value on the test report. CAUTION Torque, gasket lubrication and other factors have major effects on tests of the filters structure. 5.3.2 Bleed entrapped air from the circ
42、uit and from the filters being tested. 5.3.3 Ensure that the temperature of the test liquid meets the requirements of 5.2.2, and record the temperature. 5.3.4 Apply a pulsating pressure to the filter under test with a pressure cycle that falls within the shaded area of Figure 3, which is taken from
43、ISO 4548-5, at a rate between 0,5 Hz and 0,66 Hz; record the frequency used. A frequency higher than 0,66 Hz may be used if satisfactory experience of testing at higher frequencies exists; any such experience shall be stated in the test report. The cyclic test pressure shall be the rated fatigue pre
44、ssure at the proposed rated fatigue life.4 ISO 2016 All rights reserved ISO 12829:2016(E) Key 1 test pressure 5 % 5 15 % cyclic test pressure 2 cyclic test pressure 6 point “0” the intersection of the secant pressure rise with zero pressure 3 85 % test pressure 7 5 % cyclic test pressure 4 secant pr
45、essure rise 8 0 kPa a One impulse cycle. Figure 3 Test waveform 5.3.5 Test each filter under test to failure (see 5.4), and record the number of cycles at failure. When several filters are tested simultaneously in one setup and one filter fails, the failed filter shall be replaced with a new one, un
46、til all original test filters have failed. 5.4 Failure criteria Any of the following occurrences shall be considered a failure: a) any change from original shape; b) external leakage of any amount caused by fatigue; c) material separation (e.g. cracks). 5.5 Calculation of rated fatigue life at rated
47、 fatigue pressure 5.5.1 Report all test values and the modes of failure. 5.5.2 Use data from a minimum of six filters under test (see 5.3.5) as the sample, but if more than six filters under test failed, all data from all failed filters under test shall be evaluated. 5.5.3 Use Weibull analysis, as s
48、pecified in ISO/TR 19972-1, to calculate the 10life, N f , at the 95 % confidence level. ISO 2016 All rights reserved 5 ISO 12829:2016(E) 5.6 Verification If the calculated rated fatigue life, N f , exceeds the proposed rated fatigue life (100 000 cycles, unless otherwise specified), the rated fatig
49、ue life and rated fatigue pressure of the spin-on filter shall be considered verified. 6 Burst test to verify the rated static burst pressure 6.1 Test equipment 6.1.1 Hydraulic test stand, that provides a stable and controllable hydrostatic fluid pressure. 6.1.2 Test liquid, any suitable non-corrosive liquid. 6.1.3 Pressure-measuring instrument, mounted directly into, or as close as possible to, the filter head or base through a pressurized port that is not being used to supply the test liquid.
