ISO 23369:2022
(Main)Hydraulic fluid power — Multi-pass method of evaluating filtration performance of a filter element under cyclic flow conditions
Hydraulic fluid power — Multi-pass method of evaluating filtration performance of a filter element under cyclic flow conditions
This document specifies: a) A multi-pass filtration performance test under cyclic flow conditions 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 test currently applicable to hydraulic fluid power filter elements that exhibit an average filtration ratio greater than or equal to 75 for particle sizes ≤25 µm(c), and a final test system reservoir gravimetric level of less than 200 mg/L. It is necessary to determine by validation the range of flow rates and the lower particle size limit that can be used in test facilities. d) A test using ISO 12103‑1 A3 medium test dust contaminant and a test fluid. This document provides a test procedure that yields reproducible test data for appraising the filtration performance of a hydraulic fluid power filter element without influence of electrostatic charge. This document is applicable to three test conditions: — Base upstream gravimetric level of 3 mg/L; — Base upstream gravimetric level of 10 mg/L; — Base upstream gravimetric level of 15 mg/L.
Transmissions hydrauliques — Évaluation des performances d’un élément filtrant par la méthode de filtration multi-passe sous débit cyclique
Le présent document spécifie: a) un essai d’évaluation des performances de filtration d’éléments filtrants de transmissions hydrauliques, multi-passe sous débit cyclique, avec injection continue de polluants; b) un mode opératoire permettant de déterminer leur capacité de rétention des polluants, ainsi que leurs caractéristiques en matière d’élimination des particules et de pression différentielle; c) un essai applicable à l’heure actuelle aux éléments filtrants de transmissions hydrauliques ayant un rapport de filtration moyen égal ou supérieur à 75 pour les tailles de particules inférieures ou égales à 25 µm(c) et une concentration finale dans le réservoir du circuit d’essai inférieure à 200 mg/l. Il est nécessaire de déterminer par validation la plage des débits et la limite inférieure de taille de particules pouvant être utilisées avec les installations d’essai; d) un essai utilisant le contaminant ISO12103-1 A3 «Medium Test Dust» («poussière d’essai moyenne») comme polluant, ainsi qu’un fluide d’essai. Le présent document fournit un mode opératoire d’essai générant des données d’essai reproductibles pour l’évaluation des performances de filtration d’un élément filtrant de transmission hydraulique non soumis à l’influence de charges électrostatiques. Le présent document est applicable à trois conditions d’essai: 1) essai réalisé avec une concentration amont de base de 3 mg/l; 2) essai réalisé avec une concentration amont de base de 15 mg/l; 3) essai réalisé avec une concentration amont de base de 15 mg/l.
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 23369
Second edition
2022-12
Hydraulic fluid power — Multi-
pass method of evaluating filtration
performance of a filter element under
cyclic flow conditions
Transmissions hydrauliques — Évaluation des performances d’un
élément filtrant par la méthode de filtration multi-passe sous débit
cyclique
Reference number
© ISO 2022
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Published in Switzerland
ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Symbols . 4
5 General procedure .5
6 Test equipment .5
7 Measurement accuracy and test condition variation . 7
8 Filter performance test circuit validation procedures . 8
8.1 General . 8
8.2 Filter test system validation . 8
8.3 Contaminant injection system validation . 9
9 Summary of information required prior to testing a filter element .9
10 Preliminary test preparation .10
10.1 Test filter assembly . 10
10.2 Contaminant injection system . . 10
10.3 Filter test system . 11
11 Filter performance test .12
12 Calculations .14
13 Data presentation .17
14 Identification statement (reference to this document) .18
Annex A (normative) Base test fluid properties .19
Annex B (informative) Test system design guide .21
Annex C (informative) Example report, calculations and graphs .26
Bibliography .35
iii
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 carried out
through ISO technical committees. Each member body interested in a subject for which a technical
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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 different 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 the subject of
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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).
Any trade name used in this document is information given for the convenience of users and does not
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expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.
This document 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 23369:2021), which has been technically
revised.
The main changes are as follows:
— calculation of ramp time.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
Introduction
In hydraulic fluid power systems, one of the functions of the hydraulic fluid is to separate and lubricate
the moving parts of 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 commensurate with the degree of sensitivity of the components to contaminants and the level of
reliability required by the users.
Test procedures enable the comparison of the relative performance of filters so that the most
appropriate filter can be selected. The 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 differential pressure (relief-valve cracking pressure of 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 generation
rates) and the performance characteristics of the filter.
Therefore, a realistic laboratory test establishes the relative performance of a filter by providing the
test filter with a continuous supply of ingressed contaminant and allowing the periodic monitoring of
the filtration performance characteristics of the filter. A standard multi-pass method for evaluating
the performance of hydraulic fluid power filter elements under steady-state flow conditions has
been developed as ISO 16889. That test procedure provides a basis for the comparison of the relative
performance characteristics of various filter elements. The results from such a test, however, might not
be directly applicable to most actual operating conditions.
In actual operation, a hydraulic fluid power filter is generally not subjected to steady-state flow but
to varying degrees of cyclic flow. Tests have shown that, in many instances, the filtration capabilities
of an element are severely reduced when subjected to varying cyclic flow conditions. It is therefore
important to evaluate the filtration performance of a filter for applications under cyclic flow conditions.
The cyclic flow multi-pass test procedure for hydraulic filters specified in this document has been
developed to supplement the basic steady-state flow test (ISO 16889) for filter elements that are
expected to be placed in service with cyclic flow. The recommended flow cycle rate of 0,1 Hz is a result
of an industry survey and a broad range of test results. If much higher cycle rates are expected in
actual service, the test should be conducted at that frequency to produce more meaningful results. The
procedure specified in this document may be applied at a cycle rate other than 0,1 Hz, if agreed upon
between the supplier and user. However, only values resulting from testing at the 0,1 Hz cycle rate may
be reported as having been determined in accordance with this document.
Fluid samples are extracted from the test system to evaluate the filter element’s particulate removal
characteristics. To prevent this sampling from adversely affecting the test results, a lower limit is
placed upon the rated flow rate of filter elements that should be tested with this procedure.
The current maximum flow rate specified in this document is based upon the maximum gravimetric
level of injection systems that have been qualified to date.
v
INTERNATIONAL STANDARD ISO 23369:2022(E)
Hydraulic fluid power — Multi-pass method of evaluating
filtration performance of a filter element under cyclic flow
conditions
1 Scope
This document specifies:
a) A multi-pass filtration performance test under cyclic flow conditions 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 test currently applicable to hydraulic fluid power filter elements that exhibit an average filtration
ratio greater than or equal to 75 for particle sizes ≤25 µm(c), and a final test system reservoir
gravimetric level of less than 200 mg/L. It is necessary to determine by validation the range of flow
rates and the lower particle size limit that can be used in test facilities.
d) A test using ISO 12103-1 A3 medium test dust contaminant and a test fluid.
This document provides a test procedure that yields reproducible test data for appraising the filtration
performance of a hydraulic fluid power filter element without influence of electrostatic charge.
This document is applicable to three test conditions:
— Base upstream gravimetric level of 3 mg/L;
— Base upstream gravimetric level of 10 mg/L;
— Base upstream gravimetric level of 15 mg/L.
2 Normative references
The following documents are referred to in the text in such a way that some 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 2160, Petroleum products — Corrosiveness to copper — Copper strip test
ISO 2942, Hydraulic fluid power — Filter elements — Verification of fabrication integrity and determination
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
ISO 4021, Hydraulic fluid power — Particulate contamination analysis — Extraction of fluid samples from
lines of an operating system
ISO 4405, Hydraulic fluid power — Fluid contamination — Determination of part
...
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