EN ISO 20361:2015

SLOVENSKI STANDARD
01-september-2015
1DGRPHãþD
SIST EN ISO 20361:2009
SIST EN ISO 20361:2009/AC:2010
ýUSDONH]DWHNRþLQHLQþUSDOQLDJUHJDWL0HUMHQMHKUXSD5D]UHGDWRþQRVWLLQ
,62
Liquid pumps and pump units - Noise test code - Grades 2 and 3 of accuracy (ISO
20361:2015)
Flüssigkeitspumpen und -pumpenaggregate - Geräuschmessung - Genauigkeitsklassen
2 und 3
Pompes et groupes motopompes pour liquides - Code d'essai acoustique - Classes de
précision 2 et 3 (ISO/FDIS 20361:2015)
Ta slovenski standard je istoveten z: EN ISO 20361:2015
ICS:
17.140.20 Emisija hrupa naprav in Noise emitted by machines
opreme and equipment
23.080 ýUSDONH Pumps
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 20361
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2015
ICS 17.140.20; 23.080 Supersedes EN ISO 20361:2009
English Version
Liquid pumps and pump units - Noise test code - Grades 2 and 3
of accuracy (ISO 20361:2015)
Pompes et groupes motopompes pour liquides - Code
d'essai acoustique - Classes de précision 2 et 3 (ISO
20361:2015)
This European Standard was approved by CEN on 17 April 2015.

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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, 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: Avenue Marnix 17, B-1000 Brussels
© 2015 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 20361:2015 E
worldwide for CEN national Members.

Contents
Foreword .3
Annex ZA (informative) Relationship between this International Standard and the Essential
Requirements of EU Directive 2006/42/EC .4
Foreword
This document (EN ISO 20361:2015) has been prepared by Technical Committee ISO/TC 115 “Pumps” in
collaboration with Technical Committee CEN/TC 197 “Pumps” the secretariat of which is held by AFNOR.
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 December 2015, and conflicting national standards shall be withdrawn
at the latest by December 2015.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 20361:2009.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EU Directive.
For relationship with EU Directive, see informative Annex ZA, which is an integral part of this document.
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, Former Yugoslav Republic of Macedonia, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
Endorsement notice
The text of ISO 20361:2015 has been approved by CEN as EN ISO 20361:2015 without any modification.

Annex ZA
(informative)
Relationship between this European Standard and the Essential
Requirements of EU Directive 2006/42/EC
This European Standard has been prepared under a mandate given to CEN by the European Commission
and the European Free Trade Association to provide a means of conforming to Essential Requirements of the
New Approach Directive 2006/42/EC on machinery.
Once this standard is cited in the Official Journal of the European Union under that Directive and has been
implemented as a national standard in at least one Member State, compliance with the clauses of this
standard confers, within the limits of the scope of this standard, a presumption of conformity with the
corresponding Essential Requirements of that Directive (EHSR 1.7.4.2 u)) and associated EFTA regulations.
WARNING — Other requirements and other EU Directives may be applicable to the product(s) falling within
the scope of this standard.
INTERNATIONAL ISO
STANDARD 20361
Second edition
2015-06-01
Liquid pumps and pump units — Noise
test code — Grades 2 and 3 of accuracy
Pompes et groupes motopompes pour liquides — Code d’essai
acoustique — Classes de précision 2 et 3
Reference number
ISO 20361:2015(E)
©
ISO 2015
ISO 20361:2015(E)
© ISO 2015, Published in Switzerland
All rights reserved. Unless otherwise specified, 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
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2015 – All rights reserved

ISO 20361:2015(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Pump family and pump configuration . 2
5 Sound power level determination . 2
5.1 General . 2
5.2 Specific considerations for reference box, measurement surface, position of
microphones, and intensity probe . 4
5.2.1 General. 4
5.2.2 Reference box . 4
5.2.3 Measurement surface and microphone positions . 6
5.2.4 Position of microphones and intensity probes .10
6 Emission sound pressure level determination .10
6.1 Basic standard to be used .10
6.2 Relevant work station .10
6.3 Measurement uncertainty .10
7 Installation and mounting conditions .11
7.1 General .11
7.2 Noise test situation .11
7.2.1 General.11
7.2.2 Test on site .11
7.2.3 Test on shop test stand .11
7.2.4 Test on a specific facility intended for acoustic measurement .11
8 Operating conditions during noise measurement .12
8.1 General .12
8.2 Pumped liquid .12
8.3 NPSHA value .12
9 Information to be recorded .12
9.1 General .12
9.2 Test report .12
10 Declaration and verification of noise emission values .13
Annex A (normative) Pump alone — Measurement surface .14
Annex B (normative) Pump units — Microphone positions for sound pressure level
measurement on the measurement surface for different pump types and sizes .15
Bibliography .22
ISO 20361:2015(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 on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical Barriers
to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 115, Pumps.
This second edition cancels and replaces the first edition (ISO 20361:2007), which has been
technically revised.
iv © ISO 2015 – All rights reserved

ISO 20361:2015(E)
Introduction
The noise emitted by a pump unit can be radiated by the casing of the pump, the driving system (e.g.
motor, gear box, coupling), the piping system, and all the connected structures.
On site, the perceived noise can be significantly increased by reverberation effects or by the radiation
of extraneous sources.
Depending on the type of pump it can be useful to know the following:
a) the noise of the pumping system (including piping);
b) the noise of the pump unit, including the driver and the transmission elements but excluding the
noise of the piping system;
c) the noise emitted by the pump alone, excluding the noise from the driver, transmission elements,
and the piping;
d) the noise emitted by each of those elements in respect to a given requirement or in view of an
efficient sound proofing of the installation.
This International Standard describes methods for the determination of the noise emitted by a pump
unit [case b)] or a pump alone [case c)]. Noise emission is expressed in terms of the sound power level of
the machine and the emission sound pressure level at the relevant work station (see 6.2).
This International Standard is intended to enable the manufacturer to
— show the effectiveness of noise reduction, and
— declare the noise emission levels.
This International Standard is a type C standard as stated in ISO 12100-1 and ISO 12100-2.
When provisions of this type C standard are different from those which are stated in A or B standards,
the provisions of this type C standard take precedence.
The machinery concerned and the extent to which noise is covered are indicated in the scope of this
International Standard.
INTERNATIONAL STANDARD ISO 20361:2015(E)
Liquid pumps and pump units — Noise test code — Grades
2 and 3 of accuracy
1 Scope
This International Standard specifies all the information necessary to carry out efficiently and under
standardized conditions the determination, declaration, and verification of the airborne noise emission
of liquid pumps or pump units (see 4.1). It specifies the noise measurement methods and the operating
and mounting conditions that shall be used for the test.
Noise emission characteristics include emission sound pressure levels at specified positions and the
sound power level. The determination of these quantities is necessary for
— declaring the noise emission values, and
— purpose of noise control at source at the design stage.
The determination of these quantities is also necessary for comparing the noise emitted by liquid pumps
on the market.
The use of this International Standard ensures the reproducibility of the determination of the airborne
noise-emission characteristics within specified limits determined by the grade of accuracy of the basic
airborne noise measurement method used. Noise measurement methods according to this International
Standard are engineering methods (grade 2) and survey methods (grade 3).
This International Standard does not deal with the characterization of the structure-borne sound and
liquid-borne noise generated by liquid pumps.
NOTE This International Standard is intended to complement EN 809.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
1)
ISO 3743-1 , Acoustics — Determination of sound power levels and sound energy levels of noise sources
using sound pressure — Engineering methods for small movable sources in reverberant fields — Part 1:
Comparison method for a hard-walled test room
ISO 3743-2, Acoustics — Determination of sound power levels of noise sources using sound pressure —
Engineering methods for small, movable sources in reverberant fields — Part 2: Methods for special
reverberation test rooms
2)
ISO 3744 , Acoustics — Determination of sound power levels and sound energy levels of noise sources using
sound pressure — Engineering methods for an essentially free field over a reflecting plane
3)
ISO 3746 , Acoustics — Determination of sound power levels and sound energy levels of noise sources using
sound pressure — Survey method using an enveloping measurement surface over a reflecting plane
ISO 4871:1996, Acoustics — Declaration and verification of noise emission values of machinery and equipment
1) To be published. (Revision of ISO 3743-1:1994)
2) To be published. (Revision of ISO 3744:1994)
3) To be published. (Revision of ISO 3746:1995)
ISO 20361:2015(E)
ISO 9614-1, Acoustics — Determination of sound power levels of noise sources using sound intensity —
Part 1: Measurement at discrete points
ISO 9614-2, Acoustics — Determination of sound power levels of noise sources using sound intensity —
Part 2: Measurement by scanning
ISO 11203, Acoustics — Noise emitted by machinery and equipment — Determination of emission sound
pressure levels at a work station and at other specified positions from the sound power level
ISO 17769 (all parts), Liquid pumps and installation — General terms — Definitions, quantities, letter
symbols and units
ISO/TR 7849, Acoustics — Estimation of airborne noise emitted by machinery using vibration measurement
3 Terms and definitions
For the purposes of this document, the definitions given in ISO 17769 (all parts) and the following apply.
3.1
pump
equipment that is defined as being terminated by its inlet and outlet branches as well as in general
its shaft ends
3.2
pump unit
equipment that is comprised of the pump (3.1) and its driver (e.g. electric motor, steam turbine) including

transmission elements (e.g. coupling, gear), baseplates, and any auxiliary equipment supplied with the pump
4 Pump family and pump configuration
4.1 Pumps covered by this International Standard comprise of liquid pumps of the rotodynamic and
positive displacement, rotary, and reciprocating types.
4.2 This International Standard provides two possibilities of measurement, either pump alone (see
Table 1) or pump units (see Table 2). In these two cases, the pumps shall be installed
— on site (see 7.2.2), or
— on shop test stand (see 7.2.3), or
— in a specific facility intended for acoustic measurement (see 7.2.4).
4.3 Safety guards, e.g. coupling guards, insulation hoods etc., if any, shall be installed during noise-
emission determination.
5 Sound power level determination
5.1 General
One of the following grade 2 of accuracy methods for determining the sound power level shall be used:
— ISO 3743-1 or ISO 3743-2;
NOTE 1 ISO 3743-1 is based upon a hard-walled room and low background noise. This International Standard gives
spe
...