ISO 14085-3:2015
(Main)Aerospace series — Hydraulic filter elements — Test methods — Part 3: Filtration efficiency and retention capacity
Aerospace series — Hydraulic filter elements — Test methods — Part 3: Filtration efficiency and retention capacity
ISO 14085-3:2015 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 ISO 14085‑1, 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. ISO 14085-3:2015 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. ISO 14085-3:2015 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 ISO 14085 can be used to compare the performance of aerospace hydraulic filter elements.
Série aérospatiale — Eléments filtrants hydrauliques — Méthode d'essais — Partie 3: Efficacité de filtration et capacité de rétention
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 14085-3
First edition
2015-03-01
Aerospace series — Hydraulic filter
elements — Test methods —
Part 3:
Filtration efficiency and retention
capacity
Série aérospatiale — Eléments filtrants hydrauliques — Méthode
d’essais —
Partie 3: Efficacité de filtration et capacité de rétention
Reference number
ISO 14085-3:2015(E)
©
ISO 2015
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ISO 14085-3:2015(E)
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ii © ISO 2015 – All rights reserved
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ISO 14085-3:2015(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Symbols and abbreviated terms . 4
5 Test procedure overview . 6
6 Test equipment and supplies. 6
7 Instrument accuracy and allowable test condition variation .10
8 Test equipment validation .10
9 Summary of information required prior to testing .14
10 Preliminary test preparation .14
10.1 Test filter assembly .14
10.2 Contaminant injection system .14
10.3 Steady flow filter test system .15
10.4 Cyclic flow filter test system .17
11 Filter element efficiency test .17
11.1 Steady flow test.17
11.2 Cyclic flow test .18
12 Calculation and data reporting .
...
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