BS ISO 14085-3:2015
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
View Superseded by
Aerospace series. Hydraulic filter elements. Test methods Filtration efficiency and retention capacity
Hardcopy , PDF
07-05-2024
English
31-03-2015
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviated terms
5 Test procedure overview
6 Test equipment and supplies
7 Instrument accuracy and allowable test condition
variation
8 Test equipment validation
9 Summary of information required prior to testing
10 Preliminary test preparation
11 Filter element efficiency test
12 Calculation and data reporting
13 Identification statement (reference to this part of
ISO 14085)
Annex A (normative) - Properties of test fluid to evaluate
performance of hydraulic fluid systems filter elements
Annex B (informative) - Test system design guide
Bibliography
Explains two methods to measure in repeatable conditions the filtration efficiency of filter elements used in aviation and aerospace hydraulic fluid systems.
| Committee |
ACE/69
|
| DevelopmentNote |
Supersedes 13/30271035 DC. (03/2015)
|
| DocumentType |
Standard
|
| Pages |
48
|
| PublisherName |
British Standards Institution
|
| Status |
Superseded
|
| SupersededBy | |
| Supersedes |
This part of ISO14085 describes two methods to measure in repeatable conditions the filtration efficiency of filter elements used in aviation and aerospace hydraulic fluid systems. It can be applied when evaluating the overall characteristics of a filter element per ISO14085-1, or separately.
Since the filtration efficiency of a filter element can change during its service life as it is clogging, this test method specifies its continuous measurement by using on-line particle counters with continuous injection of test contaminant and recirculation of particles not retained by the test filter element until the differential pressure across the element reaches a given final or “terminal” value.
This part of ISO14085 allows the efficiency to be measured under both steady or cyclic flow conditions. It also is applied to measure the stabilized contamination levels that are produced by the filter element while testing with cyclic flow.
This part of ISO14085 is not intended to qualify a filter element under replicate conditions of service; this can only be done by a specific test protocol developed for the purpose, including actual conditions of use, for example the operating fluid or contamination.
The tests data resulting from application of this part of ISO14085 can be used to compare the performance of aerospace hydraulic filter elements.
| Standards | Relationship |
| ISO 14085-3:2015 | Identical |
| ISO 3968:2017 | Hydraulic fluid power — Filters — Evaluation of differential pressure versus flow |
| NFL 41 137 : 1987 XP | CONTAMINATION OF AIRCRAFT FUEL SYSTEMS - FILTERS AND FILTER ELEMENTS - FILTRATION EFFICIENCY |
| ISO 5598:2008 | Fluid power systems and components Vocabulary |
| ISO/TR 16144:2002 | Hydraulic fluid power Calibration of liquid automatic particle counters Procedures used to certify the standard reference material SRM 2806 |
| ISO 11943:1999 | Hydraulic fluid power On-line automatic particle-counting systems for liquids Methods of calibration and validation |
| ISO 11218:2017 | Aerospace Cleanliness classification for hydraulic fluids |
| ISO 3722:1976 | Hydraulic fluid power — Fluid sample containers — Qualifying and controlling cleaning methods |
| MIL-PRF-81836 Revision B:1998 | FILTER AND DISPOSABLE ELEMENT, FLUID PRESSURE, HYDRAULIC, 3 MICRON ABSOLUTE |
| NFL 41 127 : 1987 XP | CONTAMINATION OF AIRCRAFT HYDRAULIC SYSTEMS - FILTERS AND FILTER ELEMENTS - FILTRATION EFFICIENCY AND RATING OF RETENTION CAPACITY |
| ISO 11171:2016 | Hydraulic fluid power Calibration of automatic particle counters for liquids |
| ISO 2942:2004 | Hydraulic fluid power Filter elements Verification of fabrication integrity and determination of the first bubble point |
| ISO 1219-1:2012 | Fluid power systems and components — Graphical symbols and circuit diagrams — Part 1: Graphical symbols for conventional use and data-processing applications |
| SAE ARP4205 | Aerospace Fluid Power - Hydraulic Filter Elements - Method for Evaluating Dynamic Efficiency with Cyclic Flow |
| MIL F 8815 : D | FILTER AND FILTER ELEMENTS, FLUID PRESSURE, HYDRAULIC LINE, 15 MICRON ABSOLUTE AND 5 MICRON ABSOLUTE, TYPE 11 SYSTEMS; GENERAL SPECIFICATION FOR |
| ISO 16889:2008 | Hydraulic fluid power Filters Multi-pass method for evaluating filtration performance of a filter element |
| ISO 12103-1:2016 | Road vehicles — Test contaminants for filter evaluation — Part 1: Arizona test dust |
| ISO 4021:1992 | Hydraulic fluid power — Particulate contamination analysis — Extraction of fluid samples from lines of an operating system |
| ISO 4405:1991 | Hydraulic fluid power — Fluid contamination — Determination of particulate contamination by the gravimetric method |
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