SIST EN 60534-8-2:2012

Industrial-process control valves - Part 8-2: Noise considerations - Laboratory measurement of noise generated by hydrodynamic flow through control valves (IEC 60534-8-2:2011)

This part of IEC 60534-8 includes the method for measuring the sound pressure level due to liquid flow through a control valve and the method for determining the characteristic increase of noise due to the onset of cavitation. It also defines the equipment, methods and procedures for the laboratory measurement of the airborne sound needed to determine these characteristics. Two methods are provided for testing the noise generating characteristics of control valves. The first is a uniform method of measuring the radiated noise from the valve and the associated test piping including fixed flow restrictions through which the test fluid (water) is
passing (see Note 1). The noise criteria are expressed by determining the sound pressure level of the valve under consideration. The second is a procedure for measuring the sound pressure levels within pipe systems upstream and downstream of the valve under fixed operating conditions. Since inaccuracies due to the pipe transmission are eliminated, this method shall be preferred for evaluation of the acoustical characteristic of valves. The noise characteristics to be determined are useful:
a) to determine acoustical characteristics of valves and valve assemblies and the characteristic pressure ratio factor xFz of a control valve;
b) to predict valve noise for given process conditions;
c) to compare the performance of different valves and various measuring results;
d) to plan measures for increasing service life and noise abatement;
e) to determine possible adverse effects on ultra-sonic flow meter measurements;
f) to enable proper sizing of sound absorbers.
NOTE 1 Test fluids other than water or valves without downstream piping are not within the scope of this section of IEC 60534-8.
NOTE 2 The factor xFz is used in a noise prediction method which is covered in IEC 60534-8-4.

Stellventile für die Prozeßregelung -- Teil 8-2: Geräuschemission - Laboratoriumsmessungen von Geräuschen bei flüssigkeitsdurchströmten Stellventilen (IEC 60534-8-2:2011)

Vannes de regulation des processus industriels - Partie 8-2: Considérations sur le bruit - Mesure en laboratoire du bruit créé par un écoulement hydrodynamique dans une vanne de régulation (CEI 60534-8-2:2011)

La CEI 60534-8-2:2011 décrit la méthode de mesure du niveau de pression acoustique dû à un débit de liquide au travers d'une vanne de régulation, et la méthode de détermination de l'augmentation caractéristique du bruit due au début de la cavitation. Elle définit également l'équipement, les méthodes et procédures de mesure en laboratoire du bruit aérien, nécessaires à la détermination de ces caractéristiques. Deux méthodes d'essai pour les caractéristiques de génération de bruit des vannes de régulation sont fournies. La première est une méthode uniforme de mesure du bruit rayonné par la vanne et la tuyauterie d'essai associée, y compris les restrictions fixes au travers desquelles passe le fluide d'essai (eau) (voir Note 1). La seconde consiste en une procédure de mesure des niveaux de pression acoustique dans les tuyauteries en amont et en aval de la vanne, dans des conditions de fonctionnement fixes. Cette deuxième édition annule et remplace la première édition parue en 1991, et constitue une révision technique qui inclut la mesure du bruit interne.

Ventili za upravljanje v industrijskih procesih - 8-2. del: Hrup - Laboratorijske meritve hrupa zaradi hidrodinamičnega pretoka skozi ventile za upravljanje (IEC 60534-8-2:2011)

Ta del standarda IEC 60534-8 vključuje metodo za merjenje ravni zvočnega tlaka zaradi pretoka tekočin skozi ventil za upravljanje in metodo za določanje značilnega povečanja hrupa zaradi nastanka kavitacije. Določa tudi opremo, metode in postopke za laboratorijske meritve zvoka v zraku, potrebne za določitev teh
lastnosti. Navedeni sta dve metodi za preskušanje lastnosti ventilov za upravljanje, ki povzročajo hrup. Prva je enotna metoda za merjenje hrupa, ki prihaja iz ventila in
z njim povezanega preskusnega cevovoda vključno z ovirami stalnega toka, po katerih teče preskusna tekočina (voda) (glejte opombo 1). Merila za hrup so izražena z določitvijo ravni zvočnega tlaka obravnavanega ventila. Druga metoda je postopek za merjenje ravni zvočnega tlaka v cevnih sistemih višje in nižje od ventila v stalnih obratovalnih pogojih. Ker so nepravilnosti zaradi prenosa po cevi izločene, ima ta metoda prednost pri presoji akustičnih lastnosti ventilov.
Lastnosti hrupa, ki se določajo, so uporabne za:
a) opredelitev akustičnih lastnosti ventilov in sestavov ventilov ter značilnega faktorja razmerja tlaka xFz ventila za upravljanje;
b) napoved hrupa ventila v določenih procesnih pogojih;
c) primerjavo delovanja različnih ventilov in merilnih rezultatov;
d) načrtovanje ukrepov za podaljšanje življenjske dobe in zmanjšanje hrupa;
e) ugotavljanje možnih škodljivih vplivov na meritve z ultrazvočnim merilnikom pretoka;
f) opredelitev pravilne velikosti absorberjev zvoka.
OPOMBA 1: Preskusne tekočine razen vode ali ventili, ki nimajo cevovoda nižje v toku, ne spadajo v področje uporabe tega oddelka standarda IEC 60534-8.
OPOMBA 2: Faktor xFz se uporablja pri metodi za napoved hrupa iz standarda IEC 60534-8-4.

General Information

• Status: Published
• Publication Date: 22-Dec-2011
• ICS: 17.140.20 - Noise emitted by machines and equipment
• ICS: 23.060.40 - Pressure regulators
• ICS: 25.040.40 - Industrial process measurement and control
• Technical Committee: MOV - Measuring equipment for electromagnetic quantities
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 20-Dec-2011
• Due Date: 24-Feb-2012
• Completion Date: 23-Dec-2011
• Ref Project: EN 60534-8-2:2011 - Industrial-process control valves - Part 8-2: Noise considerations - Laboratory measurement of noise generated by hydrodynamic flow through control valves

Relations

• Replaces: SIST EN 60534-8-2:1998 - Industrial-process control valves -- Part 8: Noise considerations -- Section 2: Laboratory measurement of noise generated by hydrodynamic flow through control valves
• Effective Date: 01-Feb-2012
• Revised: SIST EN 60534-8-2:1998 - Industrial-process control valves -- Part 8: Noise considerations -- Section 2: Laboratory measurement of noise generated by hydrodynamic flow through control valves
• Effective Date: 06-May-2014
• Replaces: SIST EN 60534-8-2:1998 - Industrial-process control valves -- Part 8: Noise considerations -- Section 2: Laboratory measurement of noise generated by hydrodynamic flow through control valves
• Effective Date: 29-Jan-2023

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 60534-8-2:2012
01-februar-2012
1DGRPHãþD
SIST EN 60534-8-2:1998
9HQWLOL]DXSUDYOMDQMHYLQGXVWULMVNLKSURFHVLKGHO+UXS/DERUDWRULMVNH
PHULWYHKUXSD]DUDGLKLGURGLQDPLþQHJDSUHWRNDVNR]LYHQWLOH]DXSUDYOMDQMH,(&

Industrial-process control valves - Part 8-2: Noise considerations - Laboratory
measurement of noise generated by hydrodynamic flow through control valves (IEC
60534-8-2:2011)
Stellventile für die Prozeßregelung -- Teil 8-2: Geräuschemission -
Laboratoriumsmessungen von Geräuschen bei flüssigkeitsdurchströmten Stellventilen
(IEC 60534-8-2:2011)
Vannes de regulation des processus industriels - Partie 8-2: Considérations sur le bruit -
Mesure en laboratoire du bruit créé par un écoulement hydrodynamique dans une vanne
de régulation (CEI 60534-8-2:2011)
Ta slovenski standard je istoveten z: EN 60534-8-2:2011
ICS:
17.140.20 Emisija hrupa naprav in Noise emitted by machines
opreme and equipment
23.060.40 7ODþQLUHJXODWRUML Pressure regulators
25.040.40 Merjenje in krmiljenje Industrial process
industrijskih postopkov measurement and control
SIST EN 60534-8-2:2012 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

SIST EN 60534-8-2:2012

---------------------- Page: 2 ----------------------

SIST EN 60534-8-2:2012

EUROPEAN STANDARD
EN 60534-8-2

NORME EUROPÉENNE
December 2011
EUROPÄISCHE NORM

ICS 17.140.20; 23.060.40; 25.040.40 Supersedes EN 60534-8-2:1993


English version


Industrial-process control valves -
Part 8-2: Noise considerations -
Laboratory measurement of noise generated by hydrodynamic flow
through control valves
(IEC 60534-8-2:2011)


Vannes de régulation des processus Stellventile für die Prozeßregelung -
industriels - Teil 8-2: Geräuschemission -
Partie 8-2: Considérations sur le bruit - Laboratoriumsmessungen von
Mesure en laboratoire du bruit créé par un Geräuschen bei flüssigkeitsdurchströmten
écoulement hydrodynamique dans une Stellventilen
vanne de régulation (IEC 60534-8-2:2011)
(CEI 60534-8-2:2011)





This European Standard was approved by CENELEC on 2011-11-16. CENELEC 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 CENELEC 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 CENELEC member into its own language and notified
to the CEN-CENELEC Management Centre has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus,
the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia,
Spain, Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Management Centre: Avenue Marnix 17, B - 1000 Brussels


© 2011 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60534-8-2:2011 E

---------------------- Page: 3 ----------------------

SIST EN 60534-8-2:2012
EN 60534-8-2:2011 - 2 -
Foreword
The text of document 65B/801/FDIS, future edition 2 of IEC 60534-8-2, prepared by SC 65B, "Devices &
process analysis", of IEC/TC 65, "Industrial-process measurement, control and automation" was
submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 60534-8-2:2011.

The following dates are fixed:
(dop) 2012-08-16
• latest date by which the document has
to be implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2014-11-16
• latest date by which the national
standards conflicting with the
document have to be withdrawn

This document supersedes EN 60534-8-2:1993.
EN 60534-8-2:2011 constitutes a technical revision that includes internal noise measurement.

Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent
rights.

Endorsement notice
The text of the International Standard IEC 60534-8-2:2011 was approved by CENELEC as a European
Standard without any modification.

---------------------- Page: 4 ----------------------

SIST EN 60534-8-2:2012
- 3 - EN 60534-8-2:2011
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application 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.

NOTE  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.

Publication Year Title EN/HD Year

IEC 60534-1 2005 Industrial-process control valves - EN 60534-1 2005
Part 1: Control valve terminology and general
considerations


IEC 60534-2-3 1997 Industrial-process control valves - EN 60534-2-3 1998
Part 2-3: Flow capacity - Test procedures


IEC 60534-8-4 - Industrial-process control valves - EN 60534-8-4 -
Part 8-4: Noise considerations - Prediction of
noise generated by hydrodynamic flow


IEC 61672-1 2002 Electroacoustics - Sound level meters - EN 61672-1 2003
Part 1: Specifications


1)
ISO 3744 1994 Acoustics - Determination of sound power EN ISO 3744 1995
levels of noise sources using sound pressure -
Engineering method in an essentially free field
over a reflecting plane


ISO 3745 2003 Acoustics - Determination of sound power EN ISO 3745 2003
levels of noise sources using sound pressure -
Precision methods for anechoic and hemi-
anechoic rooms




1)
EN ISO 3744:1995 is superseded by EN ISO 3744:2010.

---------------------- Page: 5 ----------------------

SIST EN 60534-8-2:2012

---------------------- Page: 6 ----------------------

SIST EN 60534-8-2:2012
IEC 60534-8-2
®

Edition 2.0 2011-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE


Industrial-process control valves –
Part 8-2: Noise considerations – Laboratory measurement of noise generated by
hydrodynamic flow through control valves

Vannes de régulation des processus industriels –
Partie 8-2: Considérations sur le bruit – Mesure en laboratoire du bruit créé par
un écoulement hydrodynamique dans une vanne de régulation

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX S
ICS 17.140.20; 23.060.40; 25.040.40 ISBN 978-2-88912-709-2

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

---------------------- Page: 7 ----------------------

SIST EN 60534-8-2:2012
– 2 – 60534-8-2  IEC:2011
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Symbols . 7
5 General test criteria . 7
5.1 General . 7
5.2 Pressure regulating devices . 8
5.3 Test specimen insulation . 8
5.4 Test section piping . 8
5.5 Pressure taps . 8
5.6 Acoustic environment . 8
5.7 Instrumentation . 8
6 External sound pressure measurement . 9
6.1 General . 9
6.2 Instrumentation for noise measurement . 9
6.3 Test data accuracy . 9
6.4 Test data . 9
7 Internal sound pressure measurement . 10
7.1 Test system . 10
7.2 Instrumentation for noise measurement . 10
7.3 Test fluid . 10
7.4 Background noise . 11
7.5 Sound level sensor position . 11
7.6 Test data accuracy . 11
7.7 Test data . 11
7.8 Accuracy . 12
7.9 Data evaluation . 12
8 Determination of the characteristic pressure ratio x . 12
Fz
8.1 General . 12
8.2 Test procedures . 12
8.2.1 Test fluid . 12
8.2.2 Test conditions for determination of x . 13
Fz
8.3 Determination of x . 13
Fz
8.3.1 Peak frequency method . 13
8.3.2 A-weighted method . 13
Bibliography . 22

Figure 1 – System components for control valve closed loop and open loop noise test . 15
Figure 2 – Test arrangements with specimen outside and (alternatively) inside acoustic
environment . 17
Figure 3 – Typical curve for characteristic pressure ratio x . 18
Fz
Figure 4 – Reference test orifice plate (see 8.2.1) . 18
Figure 5 – Determination of x by peak frequency method (see 8.3.1) . 19
Fz

---------------------- Page: 8 ----------------------

SIST EN 60534-8-2:2012
60534-8-2  IEC:2011 – 3 –
Figure 6 – Determination of x by measuring the overall L , dB(A), at a constant
Fz pA
valve travel . 20
Figure 7 – Mounting position of the sound level meter in the pipe for ∆h < 0,5 mm . 21

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SIST EN 60534-8-2:2012
– 4 – 60534-8-2  IEC:2011
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

INDUSTRIAL-PROCESS CONTROL VALVES –

Part 8-2: Noise considerations –
Laboratory measurement of noise generated
by hydrodynamic flow through control valves

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60534-8-2 has been prepared by subcommittee 65B:
Measurements and control devices, of IEC technical committee 65: Industrial-process
measurement, control and automation.
This second edition cancels and replaces the first edition published in 1991 and constitutes a
technical revision that includes internal noise measurement.
The text of this standard is based on the following documents:
FDIS Report on voting
65B/801/FDIS 65B/808/RVD

---------------------- Page: 10 ----------------------

SIST EN 60534-8-2:2012
60534-8-2  IEC:2011 – 5 –

Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above Table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts of the IEC 60534 series, published under the general title Industrial-process
control valves, can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

---------------------- Page: 11 ----------------------

SIST EN 60534-8-2:2012
– 6 – 60534-8-2  IEC:2011
INDUSTRIAL-PROCESS CONTROL VALVES –

Part 8-2: Noise considerations –
Laboratory measurement of noise generated
by hydrodynamic flow through control valves



1 Scope
This part of IEC 60534-8 includes the method for measuring the sound pressure level due to
liquid flow through a control valve and the method for determining the characteristic increase
of noise due to the onset of cavitation. It also defines the equipment, methods and procedures
for the laboratory measurement of the airborne sound needed to determine these
characteristics.
Two methods are provided for testing the noise generating characteristics of control valves.
The first is a uniform method of measuring the radiated noise from the valve and the
associated test piping including fixed flow restrictions through which the test fluid (water) is
passing (see Note 1). The noise criteria are expressed by determining the sound pressure
level of the valve under consideration.
The second is a procedure for measuring the sound pressure levels within pipe systems
upstream and downstream of the valve under fixed operating conditions. Since inaccuracies
due to the pipe transmission are eliminated, this method shall be preferred for evaluation of
the acoustical characteristic of valves.
The noise characteristics to be determined are useful:
a) to determine acoustical characteristics of valves and valve assemblies and the
characteristic pressure ratio factor x of a control valve;
Fz
b) to predict valve noise for given process conditions;
c) to compare the performance of different valves and various measuring results;
d) to plan measures for increasing service life and noise abatement;
e) to determine possible adverse effects on ultra-sonic flow meter measurements;
f) to enable proper sizing of sound absorbers.
NOTE 1 Test fluids other than water or valves without downstream piping are not within the scope of this
section of IEC 60534-8.
NOTE 2 The factor x is used in a noise prediction method which is covered in IEC 60534-8-4.
Fz
2 Normative references
The following referenced documents are indispensable for the application 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.
IEC 60534-1:2005, Industrial-process control valves – Part 1: Control valve terminology and
general considerations
IEC 60534-2-3:1997, Industrial-process control valves – Part 2-3: Flow capacity – Test
procedures

---------------------- Page: 12 ----------------------

SIST EN 60534-8-2:2012
60534-8-2  IEC:2011 – 7 –
IEC 60534-8-4, Industrial-process control valves – Part 8-4: Noise considerations – Prediction
of noise generated by hydrodynamic flow
IEC 61672-1:2002, Sound level meters – Part 1: Specifications
ISO 3744:1994, Acoustics – Determination of sound power levels of noise sources using
sound pressure – Engineering methods in an essentially free field conditions over a reflecting
plane
ISO 3745:2003, Acoustics – Determination of sound power levels of noise sources using
sound pressure – Precision methods for anechoic and hemi-anechoic rooms
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60534-1, as well
as the following, apply.
3.1
test specimen
valve or combination of valve, reducer, expander, or other fittings for which test data are
required. All parts/accessories necessary to operate the specimen properly shall be included
4 Symbols
Symbol Description Unit
C Flow coefficient (C , K ) Various
v v
(see IEC 60534-1)
F Pressure recovery factor of a control valve without attached fittings at Dimensionless

L
choked flow
F Pressure recovery factor of a control valve with attached fittings at choked Dimensionless
LP
flow
F Piping geometry factor Dimensionless
p
L Internal sound pressure level at pipe wall dB(ref P )
pi o
 Mass flow rate kg/s
m
p Inlet absolute static pressure kPa or bar
1
p Outlet absolute static pressure kPa or bar
2
Differential pressure between upstream and downstream pressure taps  kPa or bar
∆p
(p – p )
1 2
3
Q Volumetric flow rate m /h
T Inlet temperature K
1
T Outlet temperature K
2
u Mean (average fluid velocity) m/s
x Ratio of pressure differential to difference of the inlet pressure p and the Dimensionless

F 1
vapour pressure p (∆p/(p -p ))
v 1 v

x Value of x where cavitation noise becomes dominant over non-cavitating Dimensionless
Fz F
noise.

5 General test criteria
5.1 General
Hydrodynamic noise may be measured externally as it radiates from the pipewall or internally
as it propagates through the fluid. Both of these measurements can be made in either a
closed loop or an open loop system and are shown in Figures 1a and 1b.

---------------------- Page: 13 ----------------------

SIST EN 60534-8-2:2012
– 8 – 60534-8-2  IEC:2011
The following information is common to all test configurations.
5.2 Pressure regulating devices
The upstream and/or downstream regulating devices are used to regulate the test
pressures. Caution should be taken to avoid a pressure differential which will create
significant noise, i.e. cavitation. If such pressure drops are unavoidable, the use of silencers,
see 5.6, is recommended as shown in Figure 1. Flow meters should be installed in
accordance with the manufacturer’s instructions.
5.3 Test specimen insulation
The test specimen shall not be provided with any insulation other than that attached by the
manufacturer as part of the normal production for the test specimen.
5.4 Test section piping
There is no limitation concerning the maximum length of upstream and downstream piping
connected to the test specimen. Uninsulated pipe shall be used. The exposed downstream or
upstream pipe within the acoustic environment shall be of a straight one-piece construction,
i.e. no flanges, circumferential joints or other pipewall reinforcements. The exposed length of
the downstream pipe shall be as specified in Figure 2a or Figure 2b. The corresponding
length of the upstream pipe shall be at least 1 m.
A mismatch between the inlet and outlet diameters of the test specimen with the inside
diameter of the adjacent piping should be minimized as far as is practical. The distance of the
pipe axis from the floor shall be approximately 1 m.
Other pipe wall thicknesses, pipe materials and insulated piping may be used but shall be
reported in the test data as (an) optional test(s).
5.5 Pressure taps
Pressure taps shall be provided for the measurement of pressures and shall conform to
IEC 60534-2-3.
5.6 Acoustic environment
The test environment shall be controlled in such a way that background, reflected, and other
extraneous noise be at least 10 dB lower than that radiated by the test section. Depending on
the test system and the acoustic environment, upstream and downstream silencers may be
necessary. General considerations for the acoustic environment can be found in ISO 3744
and ISO 3745. No sound pressure level correction shall be made for the presence of
extraneous noise.
5.7 Instrumentation
The instrumentation for sound pressure level measurement shall conform to IEC 61672-1
Class 1 or Class 2. Sound level meter characteristics shall conform to IEC 61272-1 Table 2
(A-weighting). Sound level meter calibration and sensitivity test results shall be corrected to
sea level conditions.
Additional instrumentation such as electronic recording devices and computers shall not
cause errors in the measured data of more than ± 1 dB.

---------------------- Page: 14 ----------------------

SIST EN 60534-8-2:2012
60534-8-2  IEC:2011 – 9 –
6 External sound pressure measurement
6.1 General
Alternative test arrangements are shown in Figures 2a and 2b.
The test system according to Figure 2a includes the control valve as a noise radiating device.
The test system according to Figure 2b does not include the valve, however, it does provide a
uniform sound field radiating from the pipe.
6.2 Instrumentation for noise measurement
The sound level sensor shall be located level with the centreline of the pipe 1 m from the
nearest pipe surface. Downstream distance shall be six nominal pipe diameters, but not
less than 1 m, from the test specimen outlet (see Figures 2a and 2b). Orientation of the
microphone with respect to the piping shall be in accordance with the requirements of the
microphone manufacturer.
6.3 Test data accuracy
Accuracy of flow rate, pressure and temperature measurements shall conform to
IEC 60534-2-3.
6.4 Test data
The following data and description of the test specimen and equipment facility shall be
recorded:
   Units
1 Absolute upstream pressure, p kPa or bar
1
2 Differential pressure, ∆p  kPa or bar
3 Differential pressure corresponding to
 characteristic pressure ratio, ∆p  kPa or bar
k
4 Absolute vapour pressure, p  kPa or bar
v
3
5 Density of test fluid, ρ  kg/m
6 Upstream fluid temperature, T  K
1
7 Characteristic pressure ratio, x
Fz
 for orifice plate  Dimensionless
3
8 Flow rate, Q  m /h
9 Rated travel  mm or degrees
10 Relative travel, h  Dimensionless
11 Flow coefficient at test travels (A , K , C )  Various
v v v
   (see IEC 60534-1)
12 Relative flow coefficient at test travel, φ  Dimensionless
13 Characteristic pressure ratio, x (see note)  Dimensionless
Fz,φ
14 Sound pressure level for each measuring  dB or dB(A)
 point L (as required)
p
15 Peak frequency  Hz
16 Instruments used
17 Sound level sensor position

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SIST EN 60534-8-2:2012
– 10 – 60534-8-2  IEC:2011
18 Description of test specimen including nominal
 size of valve, direction of flow, etc.
19 Description of test facility including:
  a) piping and instrumentation (schematic)
  b) nominal pipe size and wall thickness
  c) environmental chamber (if appropriate)
  d) dimensional sketch of test facility
20 Any deviation from this part of IEC 60534-8
NOTE See Clause 8 for values of φ at which test data are to be taken.
7 Internal sound pressure measurement
7.1 Test system
The principal arrangement of a test stand for measuring internal sound pressure is shown in
Figure 1a.
The measuring arrangement and the equipment for measuring the parameters Q, T , p and
1 1
T , p shall meet the requirements of IEC 60534-2-3.
2 2
The upstream silencer 4b and downstream silencer 9b shall be designed to avoid any
increase of the measured noise due to sound power generated by the upstream pressure
regulating valve 3 and downstream pressure regulating valve 9 and to prevent any acoustic
reflections of the noise created by the measured device 6. The latter is fulfilled when the
attenuation of the silencer reaches 15 dB in the considered frequency range.
7.2 Instrumentation for noise measurement
The sound level sensors exposed to the fluid shall be suitable for the given operating
conditions. For the measurement of pressures which deviate considerably from the normal air
pressure, dynamic pressure sensors are recommended. The dynamic range of the pressure
sensor arrangement (range between background noise and over modulation) should amount
to at least 80 dB. The frequency range should comprise 40 (63 Hz octave band or 50 Hz 1/3
octave band centre frequency) and 22 400 Hz (16 000 Hz octave band or 20 0
...