SIST EN ISO 29461-4:2025

Air intake filter systems for rotary machinery - Part 4: Test methods for static filter systems in coastal and offshore environments (ISO 29461-4:2025)

This document defines test methods for performance testing of individual filter elements and of the complete filtration system.1)
This procedure is intended for filter elements and filter systems which operate at flow rated up to 8 000 m3/h per filter element.
1)  The filters will be loaded with ultra-fine salt particles of a size mostly sub micron during variable humidity to simulate real offshore and coastal conditions hence filters with an initial conditioned efficiency lower than 50 % for the ePM1 particles (filter class T7) are likely to underperform and would not be suited as a single stage filter.

Ansaugfiltersysteme von Rotationsmaschinen - Prüfverfahren - Teil 4: Prüfverfahren für statische Filtersysteme in Meeres- und Offshore-Umgebungen (ISO 29461-4:2025)

Dieses Dokument legt Prüfverfahren für die Leistungsprüfung einzelner Filterelemente und kompletter Filtersysteme fest.
Dieses Verfahren ist für Filterelemente und Filtersysteme vorgesehen, die bei einem bis zu 8 000 m3/h je Filterelement bemessenem Strom arbeiten.

Systèmes de filtration d'air d'admission pour machines tournantes - Partie 4: Méthodes d'essai des systèmes de filtration statique en milieu côtier et offshore (ISO 29461-4:2025)

Le présent document définit les méthodes d'essai pour les essais de performance des éléments filtrants individuels et du système de filtration complet.1)
Ce mode opératoire est destiné aux éléments filtrants et aux systèmes de filtration qui fonctionnent à un débit allant jusqu'à 8 000 m3/h par élément filtrant.
1)  Les filtres seront chargés avec des particules de sel ultrafines d'une taille principalement du sous-micron avec une humidité variable pour simuler des conditions offshore et côtières réelles, par conséquent les filtres avec une efficacité conditionnée initiale inférieure à 50 % pour les particules ePM1 (classe de filtre T7) sont susceptibles de sous‑performer et ne conviendraient pas comme filtre à étage unique.

Zračni filtrski sistemi rotacijskih strojev - 4. del: Preskusne metode za statične filtrirne sisteme v obalnih in priobalnih okoljih (ISO 29461-4:2025)

General Information

• Status: Published
• Public Enquiry End Date: 25-Apr-2024
• Publication Date: 14-May-2025
• ICS: 29.160.99 - Other standards related to rotating machinery
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 08-May-2025
• Due Date: 13-Jul-2025
• Completion Date: 15-May-2025
• Ref Project: EN ISO 29461-4:2025 - Air intake filter systems for rotary machinery - Part 4: Test methods for static filter systems in coastal and offshore environments (ISO 29461-4:2025)

Standards Content (Sample)

SLOVENSKI STANDARD
01-julij-2025
Zračni filtrski sistemi rotacijskih strojev - 4. del: Preskusne metode za statične
filtrirne sisteme v obalnih in priobalnih okoljih (ISO 29461-4:2025)
Air intake filter systems for rotary machinery - Part 4: Test methods for static filter
systems in coastal and offshore environments (ISO 29461-4:2025)
Ansaugfiltersysteme von Rotationsmaschinen - Prüfverfahren - Teil 4: Prüfverfahren für
statische Filtersysteme in Meeres- und Offshore-Umgebungen (ISO 29461-4:2025)
Systèmes de filtration d'air d'admission pour machines tournantes - Partie 4: Méthodes
d'essai des systèmes de filtration statique en milieu côtier et offshore (ISO 29461-
4:2025)
Ta slovenski standard je istoveten z: EN ISO 29461-4:2025
ICS:
29.160.99 Drugi standardi v zvezi z Other standards related to
rotacijskimi stroji rotating machinery
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 29461-4
EUROPEAN STANDARD
NORME EUROPÉENNE
April 2025
EUROPÄISCHE NORM
ICS 29.160.99
English Version
Air intake filter systems for rotary machinery - Part 4: Test
methods for static filter systems in coastal and offshore
environments (ISO 29461-4:2025)
Systèmes de filtration d'air d'admission pour machines Ansaugfiltersysteme von Rotationsmaschinen -
tournantes - Partie 4: Méthodes d'essai des systèmes Prüfverfahren - Teil 4: Prüfverfahren für statische
de filtration statique en milieu côtier et offshore (ISO Filtersysteme in Meeres- und Offshore-Umgebungen
29461-4:2025) (ISO 29461-4:2025)
This European Standard was approved by CEN on 28 March 2025.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 29461-4:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 29461-4:2025) has been prepared by Technical Committee ISO/TC 142
"Cleaning equipment for air and other gases" in collaboration with Technical Committee CEN/TC 195
“Cleaning equipment for air and other gases” the secretariat of which is held by UNI.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by October 2025, and conflicting national standards shall
be withdrawn at the latest by October 2025.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 29461-4:2025 has been approved by CEN as EN ISO 29461-4:2025 without any
modification.
International
Standard
ISO 29461-4
First edition
Air intake filter systems for rotary
2025-04
machinery —
Part 4:
Test methods for static filter
systems in coastal and offshore
environments
Systèmes de filtration d'air d'admission pour machines
tournantes —
Partie 4: Méthodes d'essai des systèmes de filtration statique en
milieu côtier et offshore
Reference number
ISO 29461-4:2025(en) © ISO 2025

ISO 29461-4:2025(en)
© ISO 2025
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized 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 ISO’s member body in the country of the requester.
ISO copyright office
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Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
ISO 29461-4:2025(en)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
3.1 Air flows .2
3.2 Efficiencies .2
4 Symbols and abbreviated terms. 2
5 Principle . 3
6 Test rig and equipment . 3
6.1 Test rig .3
6.2 Test duct .4
6.2.1 Test rig layout .4
6.2.2 Test air conditioning .5
6.2.3 Measurement of the air flow rate .5
6.2.4 Measurement of pressure drop .5
6.2.5 Solid salt aerosol mixing section .5
6.2.6 Measurement of temperature and relative humidity .5
6.3 Measurement equipment.5
6.3.1 Test rig instrumentation .5
6.3.2 Sodium flame photometer .6
6.4 Solid salt aerosol sampling .7
6.4.1 Sample probes.7
6.4.2 Sampling air flow .7
6.5 Solid salt aerosol generation .7
6.5.1 Salt generation.7
6.5.2 Aerosol injection .7
6.6 Water spray device .7
6.7 Water collection device .7
7 Qualification of test rig and apparatus . 8
7.1 Pressure system testing .8
7.2 Solid salt aerosol uniformity .8
7.2.1 Aerosol uniformity parameters .8
7.2.2 Aerosol uniformity protocol .8
7.2.3 Aerosol uniformity results .8
7.2.4 Water droplet size distributions .9
7.2.5 Water fog sedimentation check .9
7.2.6 Schedule of qualification .9
8 Test conditions . 9
8.1 Test air .9
8.2 Test water .
...