SIST EN ISO 29461-1:2021

SLOVENSKI STANDARD
SIST EN ISO 29461-1:2021
01-december-2021
Nadomešča:
SIST EN ISO 29461-1:2013
Zračni filtrski sistemi rotacijskih strojev - Preskusne metode - 1. del: Statični
filtrski elementi (ISO 29461-1:2021)
Air intake filter systems for rotary machinery - Test methods - Part 1: Static filter elements
(ISO 29461-1:2021)
Ansaugfiltersysteme von Rotationsmaschinen - Prüfverfahren - Teil 1: Statische
Filterelemente (ISO 29461-1:2021)
Systèmes de filtration d'air d'admission pour machines tournantes - Méthodes d'essai -
Partie 1: Éléments filtrants pour filtres statiques (ISO 29461-1:2021)
Ta slovenski standard je istoveten z: EN ISO 29461-1:2021
ICS:
29.160.99 Drugi standardi v zvezi z Other standards related to
rotacijskimi stroji rotating machinery
SIST EN ISO 29461-1:2021 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 29461-1:2021

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SIST EN ISO 29461-1:2021


EN ISO 29461-1
EUROPEAN STANDARD

NORME EUROPÉENNE

October 2021
EUROPÄISCHE NORM
ICS 29.160.99 Supersedes EN ISO 29461-1:2013
English Version

Air intake filter systems for rotary machinery - Test
methods - Part 1: Static filter elements (ISO 29461-
1:2021)
Systèmes de filtration d'air d'admission pour machines Ansaugfiltersysteme von Rotationsmaschinen -
tournantes - Méthodes d'essai - Partie 1: Éléments Prüfverfahren - Teil 1: Statische Filterelemente (ISO
filtrants pour filtres statiques (ISO 29461-1:2021) 29461-1:2021)
This European Standard was approved by CEN on 13 July 2021.

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, Turkey 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
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 29461-1:2021 E
worldwide for CEN national Members.

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SIST EN ISO 29461-1:2021
EN ISO 29461-1:2021 (E)
Contents Page
European foreword . 3

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SIST EN ISO 29461-1:2021
EN ISO 29461-1:2021 (E)
European foreword
This document (EN ISO 29461-1:2021) 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 April 2022, and conflicting national standards shall be
withdrawn at the latest by April 2022.
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.
This document supersedes EN ISO 29461-1:2013.
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, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 29461-1:2021 has been approved by CEN as EN ISO 29461-1:2021 without any
modification.

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SIST EN ISO 29461-1:2021

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SIST EN ISO 29461-1:2021
INTERNATIONAL ISO
STANDARD 29461-1
Second edition
2021-09
Air intake filter systems for rotary
machinery — Test methods —
Part 1:
Static filter elements
Systèmes de filtration d'air d'admission pour machines tournantes —
Méthodes d'essai —
Partie 1: Éléments filtrants pour filtres statiques
Reference number
ISO 29461-1:2021(E)
©
ISO 2021

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SIST EN ISO 29461-1:2021
ISO 29461-1:2021(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2021
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
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Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved

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SIST EN ISO 29461-1:2021
ISO 29461-1:2021(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviated terms . 2
5 Testing and classification of filter efficiencies . 2
6 Determination of the air flow resistance versus the mass of test dust captured .4
7 Conditioning method to determine the minimum fractional test efficiency .5
8 Reporting . 5
Annex A (normative) Net area calculation . 7
Bibliography .15
© ISO 2021 – All rights reserved iii

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SIST EN ISO 29461-1:2021
ISO 29461-1:2021(E)

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
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
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
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
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
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
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 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).
This second edition cancels and replaces the first edition (ISO 29461-1:2013), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— a new test method, referring to ISO 16890 (all parts) and ISO 29463 (all parts), has been added;
— a classification table has been added;
— previous Annexes A, B, C and D have been deleted; previous Annex E has become Annex A.
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.
iv © ISO 2021 – All rights reserved

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SIST EN ISO 29461-1:2021
ISO 29461-1:2021(E)

Introduction
In rotating machinery applications, the filtering systems, typically a set of filter elements arranged in
a suitable manner, are an important part of the whole turbine/compressor system. The development
of turbine machinery used for energy production or others has led to more sophisticated equipment;
and therefore the importance of good protection of these systems has become more important in the
recent years. It is known that particulate contamination can deteriorate a turbine power system quite
substantially if not taken care of.
This event is often described as “erosion”, “fouling” and “hot corrosion” where salt and other corrosive
particles are known as potential problems. Other particulate matters can also cause significant
reduction of efficiency of the systems. It is important to understand that air filter devices in such systems
are located in various environmental conditions. The range of climate and particulate contamination is
very wide, ranging from deserts to humid rain forests to arctic environments. The requirements on
these filter systems are obviously different depending on where they will be operating.
ISO 29461 (all parts) has based the performance of the air intake filter systems not only upon heavy
dust collection but also particulate efficiency in a size range that is considered to be the problematic
area for these applications. Both ultra-fine and fine particles, as well as larger particles, should be
considered when evaluating turbine fouling. In typical outdoor air, ultra-fine and fine particles in the
size range from 0,01 μm to 1 μm contribute to > 99 % of the number concentration and to > 90 % of the
surface contamination. The majority of the mass normally comes from larger particles (>1,0 μm).
Turbo-machinery filters comprise a wide range of products from filters for very coarse particles to
filters for very fine, sub-micron particles. The range of products varies from depth to surface loading
systems, which can be regenerated e.g. by pulse cleaning. The filters and the systems have to withstand
a wide temperature and humidity range, very low to very high dust concentration and mechanical
stress. The shape of products existing today can be of many different types and have different functions
such as droplet separators, coalescing products, filter pads, metal filters, inertial filters, filter cells,
bag filters, panel-type, cleanable and depth loading filter cartridges and pleated media surface filter
elements.
ISO 29461 (all parts) provides a way to compare these products in a similar way and define what
criteria are important for air filter intake systems for rotary machinery performance protection.
The aim is to compare different filters and filter types with respect to the operating conditions they
finally will be used in. For instance, if a filter or a filter system is meant to operate in an extreme, very
dusty environment, the real particulate efficiency of such a filter cannot be predicted because the dust
loading of the filter plays an important role. A further part of ISO 29461 will address the performance
of cleanable and surface loading filters. Filters in turbo-machinery applications can also face very harsh
operating conditions such as high air flow rates or water and salt ingress. Further parts of ISO 29461
will address the performance of filters under such harsh conditions.
© ISO 2021 – All rights reserved v

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SIST EN ISO 29461-1:2021

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SIST EN ISO 29461-1:2021
INTERNATIONAL STANDARD ISO 29461-1:2021(E)
Air intake filter systems for rotary machinery — Test
methods —
Part 1:
Static filter elements
1 Scope
This document specifies methods and procedures for determining the static performance of particulate
air filters used in air intake filter systems for rotary machinery such as stationary gas turbines,
compressors and other stationary internal combustion engines. It applies to air filters with an efficiency
of 85 % or more for the MPPS (EPA and HEPA filters) which are tested according to ISO 29463 (all parts)
and filters with a lower efficiency which are tested according to ISO 16890 (all parts). The procedures
described in both ISO 16890 (all parts) and ISO 29463 (all parts) are applied and extended by this
3 3
document to air filters which operate at flow rates within the range 0,24 m /s (850 m /h) up to
3 3
2,36 m /s (8 500 m /h).
Static filter systems normally use multiple stages of coarse, fine and optional EPA or HEPA filter elements
to protect the machinery. The scope of this document includes methods for performance testing of
individual filter elements. It does not include methods for the direct measurement of the performance
of entire systems as installed in service except in cases where they can meet the qualification criteria
for the test assembly. Nevertheless, cumulative filter efficiencies of multistage systems of fine filters
can be calculated by using the methods described in ISO 16890-1.
This document refers to static (barrier) filter systems but can also be applied to other filter types and
systems in appropriate circumstances, for example to evaluate the initial efficiency of cleanable and
surface loading filters.
The performance results obtained in accordance with this document cannot be quantitatively applied
(by themselves) to predict performance in service with regard to efficiency and lifetime.
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 15957, Test dusts for evaluating air cleaning equipment
ISO 16890 (all parts), — Air filters for general ventilation
ISO 29463 (all parts), — High efficiency filters and filter media for removing particles from air
ISO 29464, Cleaning of air and other gases — Terminology
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 29464 and the following
apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
© ISO 2021 – All rights reserved 1

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SIST EN ISO 29461-1:2021
ISO 29461-1:2021(E)

— IEC Electropedia: available at http:// www .electropedia .org/
3.1
EPA filter
efficient particulate air filter
filters with performance complying with requirements of filter class ISO T10 to ISO T12 as per this
document
Note 1 to entry: EPA filters cannot be and shall not be leak tested.
3.2
initial gravimetric arrestance
A
100
ratio of the mass of a standard test dust retained by the filter to the mass of dust fed after the first 100 g
of dust load
Note 1 to entry: This measure is expressed as a weight percentage.
4 Symbols and abbreviated terms
For the application of this document, the following symbols and abbreviated terms apply:
ePM Minimum efficiency value with x = 1 µm, 2,5 µm or 10 µm of the conditioned filter element,
x, min
% (see ISO 16890-1)
ePM Efficiency with x = 1 µm, 2,5 µm or 10 µm, % (see ISO 16890-1)
x
MPPS Most penetrating particle size
5 Testing and classification of filter efficiencies
Filters with an efficiency of 85 % or more for the MPPS (EPA and HEPA filters) shall be tested
according to ISO 29463 (all parts), while filters with a lower efficiency shall be tested according to
ISO 16890 (all parts). Filters are classified in groups and classes based on their efficiency as defined in
Table 1.
NOTE For the classification of ISO ePM and
...