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International
Standard
ISO 29461-3
First edition
Air intake filter systems for rotary
2024-07
machinery — Test methods —
Part 3:
Mechanical integrity of filter
elements
Systèmes de filtration d'air d'admission pour machines
tournantes — Méthodes d'essai —
Partie 3: Intégrité mécanique des éléments filtrants
Reference number
© ISO 2024
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ii
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
3.1 Test parameter .2
3.2 Filter to be tested .2
3.3 Test duration .3
3.4 Test materials .3
4 Test rig, conditions and equipment . 3
4.1 Test conditions .3
4.2 Test rig – General requirements .3
4.3 Camera .4
4.4 Differential pressure measurement .4
4.5 Flow measurement .4
4.6 Dust feeder .5
4.7 Water spraying nozzles (fogging nozzles) . .5
4.8 Final filter/coarse filter mat or grid .6
4.9 Temperature, relative humidity .6
5 Qualification of test rig and apparatus . 6
5.1 Pressure system test .6
5.2 Test rig — Pressure drop of test duct with no test device installed .6
5.3 Test rig — Pressure drop reference test .6
5.4 Summary of qualification requirements and schedule .6
6 Test materials . 7
6.1 Test dust .7
6.2 Water .7
6.3 Coarse filter .7
7 Test procedure . 7
7.1 General .7
7.2 Test result evaluation .8
7.2.1 General .8
7.2.2 Measurement of pressure drop .8
7.2.3 Visual inspection of filter .8
7.2.4 Visual inspection downstream of the test device .8
7.2.5 Final test in accordance with ISO 29461-1 .8
7.3 Test preparation .9
7.4 Determination of the initial loading concentration of test dust and water.9
7.5 Loading procedure .10
7.6 Fail/pass criteria .11
7.6.1 General .11
7.6.2 Release of parts .11
7.6.3 Pressure drop decrease .11
7.6.4 Visual inspection during test .11
7.6.5 Final test in accordance with ISO 29461-1 .11
8 Reporting results .12
8.1 General and descriptive information . 12
8.2 Test data and results . 13
8.3 Concluding statement .14
Annex A (normative) Wet burst testing.15
Annex B (informative) Test report example .16
iii
Bibliography .20
iv
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
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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 document should be noted. This document was drafted in accordance with the editorial rules of the
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This document was prepared by Technical Committee ISO/TC 142, Cleaning equipment for air and other gases,
in collaboration with the European Committee for Standardization (CEN) Technical Committee CEN/TC 195,
Cleaning equipment for air and other gases, in accordance with the Agreement on technical cooperation
between ISO and CEN (Vienna Agreement).
A list of all parts in the ISO 29461 series can be found on the ISO website.
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.
v
Introduction
In rotating machinery applications, the filtering system, typically a set of
...