EN 60534-8-3:2000
(Main)Industrial-process control valves - Part 8-3: Noise considerations - Control valve aerodynamic noise prediction method
Industrial-process control valves - Part 8-3: Noise considerations - Control valve aerodynamic noise prediction method
Establishes a theoretical method to predict the external sound-pressure level generated in a control valve by the flow of compressible fluids. Applies to the following single-stage valves: globe (single and double seated), butterfly, angle, rotary plug (eccentric, spherical), ball, and valves with cage trims.
Stellventile für die Prozessregelung - Teil 8-3: Geräuschbetrachtungen - Berechnungsverfahren zur Vorhersage der aerodynamischen Geräusche von Stellventilen
Vannes de régulation des processus industriels - Partie 8-3: Considérations sur le bruit - Méthode de prédiction du bruit aérodynamique des vannes de régulation
Etablit une méthode théorique pour prévoir le niveau de pression sonore extérieur engendré dans une vanne de régulation par le débit d'un fluide compressible. S'applique aux vannes monoétagées suivantes: à soupape (à simple et double siège), papillon, d'angle, à obturateur rotatif (excentré, sphérique), à tournant sphérique, et vannes à cage.
Industrial-prodess control valves - Part 8-3: Noise considerations - Control valve aerodynamic noise prediction method (IEC 60534-8-3:2000)
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
01-april-2001
Industrial-prodess control valves - Part 8-3: Noise considerations - Control valve
aerodynamic noise prediction method (IEC 60534-8-3:2000)
Industrial-process control valves -- Part 8-3: Noise considerations - Control valve
aerodynamic noise prediction method
Stellventile für die Prozessregelung -- Teil 8-3: Geräuschbetrachtungen -
Berechnungsverfahren zur Vorhersage der aerodynamischen Geräusche von
Stellventilen
Vannes de régulation des processus industriels -- Partie 8-3: Considérations sur le bruit -
Méthode de prédiction du bruit aérodynamique des vannes de régulation
Ta slovenski standard je istoveten z: EN 60534-8-3:2000
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
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
NORME CEI
INTERNATIONALE IEC
60534-8-3
INTERNATIONAL
Deuxième édition
STANDARD
Second edition
2000-07
Vannes de régulation des processus industriels –
Partie 8-3:
Considérations sur le bruit –
Méthode de prédiction du bruit aérodynamique
des vannes de régulation
Industrial-process control valves –
Part 8-3:
Noise considerations –
Control valve aerodynamic noise prediction method
IEC 2000 Droits de reproduction réservés Copyright - all rights reserved
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XA
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60534-8-3 IEC:2000 – 3 –
CONTENTS
Page
FOREWORD . 5
INTRODUCTION .9
Clause
1 Scope and limitations . 11
2 Normative references . 13
3 Definitions. 13
4 Symbols . 15
5 Valves with standard trim . 21
5.1 Pressures and pressure ratios. 21
5.2 Regime definition . 23
5.3 Preliminary calculations. 25
5.4 Regime I (subsonic flow) . 29
5.5 Regimes II to V (common calculations). 31
5.6 Noise calculations . 35
5.7 Calculation flow chart . 39
6 Valves with noise-reducing trim . 41
6.1 Introduction. 41
6.2 Single stage, multiple flow passage trim . 41
6.3 Single flow path, multistage pressure reduction trim (two or more throttling steps) . 43
6.4 Multipath, multistage trim (two or more passages and two or more stages) . 47
6.5 Valves not included in this standard. 49
7 Valves with higher outlet Mach numbers . 49
7.1 Introduction. 49
7.2 Calculation procedure . 49
Annex A (informative) Calculation examples . 55
Bibliography . 113
Figure 1 – Single stage, multiple flow passage trim . 41
Figure 2 – Single flow path, multistage pressure reduction trim . 43
Figure 3 – Multipath, multistage trim (two or more passages and two or more stages) . 47
Table 1 − Numerical constants N . 27
Table 2 – Typical values of valve style modifier F (full size trim). 27
d
Table 3 – Acoustic power ratio r . 29
w
Table 4 – Frequency factors G and G . 39
x y
60534-8-3 IEC:2000 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL-PROCESS CONTROL VALVES –
Part 8-3: Noise considerations –
Control valve aerodynamic noise prediction method
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the 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, the IEC publishes International Standards. 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. The 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 the 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 National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60534-8-3 has been prepared by subcommittee 65B: Devices, of
IEC technical committee 65: Industrial-process measurement and control.
This second edition of IEC 60534-8-3 cancels and replaces the first edition published in 1995.
This second edition constitutes a technical revision.
The text of this standard is based on the following documents:
FDIS Report on voting
65B/400/FDIS 65B/407/RVD
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 3.
60534-8-3 IEC:2000 – 7 –
Annex A is for information only.
The committee has decided that the contents of this publication will remain unchanged until 2007.
At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
60534-8-3 IEC:2000 – 9 –
INTRODUCTION
The mechanical stream power, as well as acoustical efficiency factors, are calculated for
various flow regimes. These acoustical efficiency factors give the proportion of the mechanical
stream power which is converted into internal sound power.
This method also provides for the calculation of the internal sound pressure and the peak
frequency for this sound pressure, which is of special importance in the calculation of the pipe
transmission loss.
At present, a common requirement by valve users is the knowledge of the sound pressure level
outside the pipe, typically 1 m downstream of the valve or expander and 1 m from the pipe wall.
This part of IEC 60534 offers a method to establish this value.
The equations in this part of IEC 60534 make use of the valve sizing factors as used in
IEC 60534-1 and IEC 60534-2-1.
In the usual control valve, little noise travels through the wall of the valve. The noise of interest
is only that which travels downstream of the valve and inside of the pipe and then escapes
through the wall of the pipe to be measured typically at 1 m downstream of the valve body and
1 m away from the outer pipe wall.
Secondary noise sources may be created where the gas exits the valve outlet at higher Mach
numbers. This method allows for the estimation of these additional sound levels which can then
be added logarithmically to the sound levels created within the valve. See clauses 5 and 6 for
Mach numbers up to 0,3 and clause 7 for Mach numbers greater than 0,3.
Although this prediction method cannot guarantee actual results in the field, it yields calculated
predictions within 5 dB(A) for the majority of noise data from tests under laboratory conditions
(reference IEC 60534-8-1).
The bulk of the test data used to validate the method was generated using air at moderate
pressures and temperatures; however, it is believed that the method is generally applicable to
other gases and vapours and at higher pressures. Uncertainties become greater as the fluid
behaves less perfectly for extreme temperatures and for downstream pressures far different
from atmospheric, or near the critical point. The equations include terms which account for fluid
density and the ratio of specific heat.
NOTE Laboratory air tests conducted with up to 1 830 kPa (18,3 bar) upstream pressure and up to 1 600 kPa
(16,0 bar) downstream pressure and steam tests up to 225 °C showed good agreement with the calculated values.
The transmission loss equations are based on a rigorous analysis of the interaction between
the sound waves existing in the pipe and the many coincidence frequencies in the pipe wall.
The wide tolerances in pipe wall thickness allowed in commercial pipe severely limit the value
of the very complicated mathematical approach required for a rigorous analysis; therefore, a
simplified method is used.
Example calculations are given in annex A.
This method is based on the IEC standards listed in clause 2 and the references given in the
bibliography.
60534-8-3 IEC:2000 – 11 –
INDUSTRIAL-PROCESS CONTROL VALVES –
Part 8-3: Noise considerations –
Control valve aerodynamic noise prediction method
1 Scope and limitations
This part of IEC 60534 establishes a theoretical method to predict the external sound-pressure
level generated in a control valve and within adjacent pipe expanders by the flow of
compressible fluids.
This method considers only single-phase dry gases and vapours and is based on the perfect
gas laws.
This standard addresses only the noise generated by aerodynamic processes in valves and in
the connected piping. It does not consider any noise generated by reflections, mechanical
vibrations, unstable flow patterns and other unpredictable behaviour.
It is assumed that the downstream piping is straight for a length of at least 2 m from the point
where the noise measurement is made.
This method is valid only for steel and steel alloy pipes (see equations (38) and (40) in 5.6).
The method is applicable to the following single-stage valves: globe (straight pattern and angle
pattern), butterfly, rotary plug (eccentric, spherical), ball, and valves with cage trims.
Specifically excluded are the full bore ball valves where the product F C exceeds 50 % of the
p
rated flow coefficient.
For limitations on special low noise trims not covered by this standard, see 6.5. When the
Mach number in the valve outlet exceeds 0,3 for standard trim or 0,2 for low noise trim, the
procedure in clause 7 is used.
The Mach number limits in this standard are as follows:
Mach number limit
Mach number location Clause 7
Clause 5 Clau
...
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