1、BSI Standards PublicationBS ISO 14085-6:2015Aerospace series Hydraulicfilter elements Test methodsPart 6: Initial cleanliness levelBS ISO 14085-6:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 14085-6:2015.The UK participation in its preparation was entru
2、sted to TechnicalCommittee ACE/69, Aerospace hydraulic systems, fluids andcomponents.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
3、correctapplication. The British Standards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 80582 0ICS 49.080Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strateg
4、y Committee on 31 March 2015.Amendments issued since publicationDate T e x t a f f e c t e dBS ISO 14085-6:2015 ISO 2015Aerospace series Hydraulic filter elements Test methods Part 6: Initial cleanliness levelSrie arospatiale Elments filtrants hydrauliques Mthode dessais Partie 6: Niveau de propretI
5、NTERNATIONAL STANDARDISO14085-6First edition2015-03-01Reference numberISO 14085-6:2015(E)BS ISO 14085-6:2015ISO 14085-6:2015(E)ii ISO 2015 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2015All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilize
6、d 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 below or ISOs member body in the country of the requester.ISO copyright o
7、fficeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 14085-6:2015ISO 14085-6:2015(E)Foreword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 14 Summary of test method 15 Mate
8、rials and equipment 16 Procedure. 27 Contaminant analysis 37.1 Method of analysis . 37.2 Reporting of results 38 Criterion for acceptance . 39 Identification statement . 3Annex A (informative) Contaminant analysis methods 4Annex B (informative) Filter element cleanliness test data report form . 6Bib
9、liography 7 ISO 2015 All rights reserved iiiContents PageBS ISO 14085-6:2015ISO 14085-6:2015(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carrie
10、d 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 work. IS
11、O 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 different
12、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 may be t
13、he 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/patents).An
14、y 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 conformity assessment, as well as information about ISOs adherence to the WTO principles in t
15、he Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 20, Aircraft and space vehicles, Subcommittee SC 10, Aerospace fluid systems and components.ISO 14085 consists of the following parts, under the gener
16、al title Aerospace series Hydraulic Filter elements Test methods : Part 1: Test sequence Part 2: Conditioning Part 3: Filtration efficiency and retention capacity Part 4: Verification of collapse/burst pressure rating Part 5: Resistance to flow fatigue Part 6: Initial cleanliness leveliv ISO 2015 Al
17、l rights reservedBS ISO 14085-6:2015ISO 14085-6:2015(E)IntroductionIn aerospace hydraulic fluid power systems, power is transmitted and controlled through a liquid under pressure. The liquid is both a lubricant and power-transmitting medium. The presence of solid contaminant particles in the liquid
18、interferes with the ability of the hydraulic fluid to lubricate and causes wear and malfunction of the components. The extent of contamination in the fluid has a direct bearing in the performance, reliability, and safety of the system, and needs to be controlled to levels that are considered appropr
19、iate for the system concerned.Filters are used to control the contamination level of the fluid by removing solid contaminant particles, typically consisting of a filter element enclosed in a filter housing. The filter element is the porous device that performs the actual process of filtration. The c
20、omplete assembly is designated as a filter.Hydraulic fluid circuits require high levels of cleanliness which are not to be degraded by the filter element itself when installed into the circuit. This procedure defined a test method to determine the initial cleanliness level of a new hydraulic filter
21、element. ISO 2015 All rights reserved vBS ISO 14085-6:2015BS ISO 14085-6:2015Aerospace series Hydraulic filter elements Test methods Part 6: Initial cleanliness level1 ScopeThis part of ISO 14085 defines a reference method for determining the level of cleanliness of new filter elements for use in ai
22、rcraft hydraulic systems, after production prior to shipment, or prior to installation in the circuit.It applies to filter elements used on systems requiring fluid cleanliness conditions defined in the particular specification.The tests data resulting from application of this part of ISO 14085 can b
23、e used to compare the cleanliness of aerospace hydraulic filter elements.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated refere
24、nces, the latest edition of the referenced document (including any amendments) appliesISO 3722, Hydraulic fluid power Fluid sample containers Qualifying and controlling cleaning methodsISO 4405, Hydraulic fluid power Fluid contamination Determination of particulate contamination by the gravimetric m
25、ethodISO 5598, Fluid power systems and components Vocabulary3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 5598 and the following apply.3.1extraction liquidtest liquid extracted from the filter housing in which the filter element is installed during
26、agitation4 Summary of test methodThe test consists of inserting the test filter element into a pre-cleaned filter housing and adding a solvent. The filter assembly shall then be agitated to flush and collect built-in contaminant from a new filter element. Multiple extraction liquid samples shall be
27、used to achieve maximum contaminant removal. The collected contaminant shall then be analysed using particle counting or gravimetric techniques, and the amount of contamination shall be reported.5 Materials and equipment5.1 Test liquid: Use a suitable solvent with a viscosity less than 5 mm2/s at te
28、st temperature. The test liquid shall be compatible with all materials used in the filter, as well as with the functional liquid of the INTERNATIONAL STANDARD ISO 14085-6:2015(E) ISO 2015 All rights reserved 1BS ISO 14085-6:2015ISO 14085-6:2015(E)system in which the filter will be applied. The test
29、liquid should be compatible with all test apparatus, including seals and filters, and filtered to the agreed initial cleanliness level.The supplier and purchaser should agree upon the test liquid to be used in the collection process, and its required initial cleanliness level, prior to the test. The
30、 contamination contained in the entire test liquid volume to be used shall be less than 1 % of the presumed or allowable contamination level of the filter element or class 1 per ISO 11218, so that it does not significantly influence the measured contamination level. If the expected contamination lev
31、el is unknown, a maximum contamination level of three particles larger than or equal to 6 m(c), or equivalent, per millilitre of container volume is considered appropriate.WARNING Exercise care when using test liquids with low flash points.5.2 Test filter housing: Use a test filter housing (recommen
32、ded by the filter manufacturer). Preferably the housing type to be used in service can be utilized for the cleanliness test. The test housing shall be pre-cleaned to achieve the required blank value. The plugs used to seal the housing shall also be pre-cleaned.5.3 Collection tray and/or vessels: Cle
33、an all collection apparatus to achieve the required blank value. Any collection apparatus should be covered after cleaning and prior to use in order to limit contamination from the environment.NOTE It is possible for contaminant remaining on the collection apparatus to be transferred to the sample a
34、nd included as part of the contaminant attributed to the filter element.5.4 Clean sample containers: Sample containers shall be sufficiently clean so as not to affect the results of contaminant analysis. If the expected contamination level is unknown, a maximum contamination level of three particles
35、 larger than or equal to 6 m(c), or equivalent, per millilitre of container volume is considered appropriate. Qualify and control container cleanliness in accordance with ISO 3722.5.5 Calibrated graduated cylinder: Use a calibrated graduate cylinder for fluid volume measurement that is sufficiently
36、clean so as not to affect the results of contaminant analysis.6 Procedure6.1 Clean the test filter housing as required with clean test liquid by either pressure rinsing, flushing, or agitation.6.2 After cleaning the housing, conduct a final agitation by filling the housing approximately 2/3 full wit
37、h clean test liquid. Record the volume of the test fluid added (minimum accuracy 5 %) on the report sheet of Annex B. Put clean plugs into the inlet and outlet ports, conduct the agitation in accordance with a predetermined method, then pour the test fluid into a clean sample container. See ISO 1841
38、3 for guidance.NOTE Insertion of the port plugs can generate contamination that will be included in the blank sample. Use clean plugs and caution not to over tighten the port plugs.6.3 Measure the contamination contained in the entire housing sample (blank) per the procedures of Clause 7, and record
39、 on the report sheet of Annex B. If the total contamination in the housing blank sample is less than 10 % of the presumed or allowable contamination level of the filter element, then record the value on the report sheet in Annex B and proceed with the test. If the blank levels exceed the requirement
40、s, the housing and all of the equipment used shall be cleaned until the level is acceptable.6.4 Insert the filter element to be tested into the cleaned filter housing.6.5 Fill the filter assembly approximately 2/3 full of clean test liquid. Record the volume of fluid added (minimum accuracy 5 %) on
41、the report sheet of Annex B. The volume of fluid added should be measured with a calibrated graduated cylinder that is sufficiently clean so as to not affect the results of contaminant analysis.2 ISO 2015 All rights reservedBS ISO 14085-6:2015ISO 14085-6:2015(E)6.6 Insert clean plugs into the inlet
42、and outlet ports.NOTE Insertion of the port plugs can generate contamination that will be included in the sample. Use clean plugs and take care not to over tighten the port plugs.6.7 Agitate in accordance with a predetermined method, reporting all relevant data (duration, frequency, amplitude, and d
43、irection).6.8 Remove the port plugs and pour the extraction liquid from the outlet port into a clean sample container.6.9 Measure the contamination level of the entire extraction liquid sample per the procedures of Clause 7, and label the result as C1.6.10 Repeat 6.5 to 6.9 twice and record these re
44、petitions as C2 and C3. Determine whether C3 0,1 (C1+C2+C3) and if so, the extraction is complete. If not repeat 6.5 to 6.9 until Cn 0,1 (C1Cn)6.11 If 6 extractions have been performed without C6 0,1 (C1C6), then the extraction parameters are not suitable and shall be modified. Repeat operations 6.4
45、 to 6.9 with new extraction parameters on a new filter element.6.12 Record the results of the individual tests on the report sheet of Annex B.7 Contaminant analysis7.1 Method of analysisAnalyse the liquid samples collected using one of the methods described in Annex A. The method of contaminant anal
46、ysis shall be agreed upon between all parties involved.The whole extraction fluid volume should be analysed to quantify the total amount of contaminant. The amount of contaminant shall be expressed per 100 cm3of wetted volume of the housing with filter element installed.7.2 Reporting of resultsRepor
47、t the results of the contamination analyses on the report sheet in Annex B.8 Criterion for acceptanceAccept the cleanliness of the filter element if the reported cleanliness, as determined by the agreed contamination analysis method, is equal to or better than component cleanliness specified in the
48、inspection document or specification.9 Identification statementUse the following statement in test reports, catalogues, and sales literature when electing to comply with this part of ISO 14085.“Method for determining filtration performance data in accordance with ISO 14085-6, Aerospace series Hydrau
49、lic Filter elements Test methods Part 6: Cleanliness Level.” ISO 2015 All rights reserved 3BS ISO 14085-6:2015ISO 14085-6:2015(E)Annex A (informative) Contaminant analysis methodsA.1 General principlesThe measured cleanliness level of a filter element depends upon the procedures used to analyse the contaminant. Because the sample extracted will often contain small amounts of contaminant diluted significantly in test liquid, good laboratory techniques are necessary to avoid both loss of contamin
