EN 60534-8-2:1993
(Main)Industrial-process control valves - Part 8: Noise considerations - Section 2: Laboratory measurement of noise generated by hydrodynamic flow through control valves
Industrial-process control valves - Part 8: Noise considerations - Section 2: Laboratory measurement of noise generated by hydrodynamic flow through control valves
Provides a method for measuring the sound-pressure level due to liquid flow through a control valve, and the characteristic increase in noise due to cavitation.
Stellventile für die Prozeßregelung - Teil 8: Geräuschemission - Hauptabschnitt 2: Laboratoriumsmessungen von Geräuschen bei flüssigkeitsdurchströmten Stellventilen
Vannes de régulation des processus industriels - Partie 8: Considérations sur le bruit - Section 2: Mesure en laboratoire du bruit créé par un écoulement hydrodynamique dans une vanne de régulation
Fournit une méthode de mesure du niveau de pression sonore dû à un débit de liquide au travers d'une vanne de régulations, ainsi que l'augmentation caractéristique du bruit due à la cavitation.
Industrial-process control valves - Part 8: Noise consideration - Section 2: Laboratory measurement of noise generated by hydrodynamic flow through control valves (IEC 60534-8-2:1991)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-november-1998
Industrial-process control valves - Part 8: Noise consideration - Section 2:
Laboratory measurement of noise generated by hydrodynamic flow through
control valves (IEC 60534-8-2:1991)
Industrial-process control valves -- Part 8: Noise considerations -- Section 2: Laboratory
measurement of noise generated by hydrodynamic flow through control valves
Stellventile für die Prozeßregelung -- Teil 8: Geräuschemission -- Hauptabschnitt 2:
Laboratoriumsmessungen von Geräuschen bei flüssigkeitsdurchströmten Stellventilen
Vannes de régulation des processus industriels -- Partie 8: Considérations sur le bruit --
Section 2: Mesure en laboratoire du bruit créé par un écoulement hydrodynamique dans
une vanne de régulation
Ta slovenski standard je istoveten z: EN 60534-8-2:1993
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.
CEI
NORME
I EC
INTERNATIONALE
534-8-2
INTERNATIONAL
Première édition
STANDARD First edition
1991-05
processus industriels
régulation des
Vannes de
Partie 8:
Considérations sur le bruit
Section 2: Mesure en laboratoire du bruit
créé par un écoulement hydrodynamique
dans une vanne de régulation
-process control valves
Industrial
Part 8:
Noise considerations
Section 2: Laboratory measurement of
noise generated by hydrodynamic flow
through control valves
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534-8-2 © IEC – 3 –
CONTENTS
Page
FOREWORD
Clause
1 Scope
2 9
Normative references
3 Definitions 9
4 Test system
5 Characteristic pressure ratio xFz
6 Testing procedures
7 Test data
Table 1 – Test section piping
Figures 23
534-8-2 © IEC – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
INDUSTRIAL-PROCESS CONTROL VALVES
Part 8: Noise considerations
Section 2: Laboratory measurement of noise generated by
hydrodynamic flow through control valves
FOREWORD
1) The formal decisions or agreements of the IEC on technical matters, prepared by Technical Committees on
which all the National Committees having a special interest therein are represented, express, as nearly as
possible, an international consensus of opinion on the subjects dealt with.
2) They have the form of recommendations for international use and they are accepted by the National
Committees in that sense.
3)
In order to promote international unification, the IEC expresses the wish that all National Committees
should adopt the text of the IEC recommendation for their national rules in so far as national conditions will
permit. Any divergence between the IEC recommendation and the corresponding national rules should, as
far as possible, be clearly indicated in the latter.
This section of the International Standard IEC 534-8 has been prepared by Sub-
Committee 65B: Elements of systems, of IEC Technical Committee No. 65: Industrial-
process measurement and control.
The text of this section is based on the following documents:
Six Months' Rule Report on Voting
658(00)75 6513(00)80
Full information on the voting for the approval of this section can be found in the Voting
Report
indicated in the above table.
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534-8-2© IEC
INDUSTRIAL-PROCESS CONTROL VALVES
Part 8: Noise considerations
Section 2: Laboratory measurement of noise generated by
hydrodynamic flow through control valves
1 Scope
This section of IEC 534-8 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. The airborne sound includes that radiated from the
control valve and the associated piping configuration, including fixed flow restrictions
through which the test fluid (water) is passing (see note 1).
The primary purpose of this section of IEC 534-8 is to provide a method for determining
the characteristic increase of noise due to cavitation, including a method for measuring
noise generated in control valves by hydrodynamic flow. Methods of measuring the noise
radiated from the valve and associated test piping allows a comparison of various
measured data which is beneficial to the user and the manufacturer. The noise to be
measured takes into account the noise radiated from the control valve itself and the noise
generated by the valve but radiated from the associated piping system. The test data are
expressed as sound pressure levels of the valve under consideration using water as the
test fluid. Determination of sound power levels is beyond the scope of this section of
IEC 534-8. The noise characteristics are useful for the following reasons:
FZ of a control valve;
to determine the characteristic pressure ratio factor x
a)
b) to predict valve noise for given process conditions;
ormance of different valves;
c) to compare the pe rf
d) to plan measures for increasing service life and noise abatement.
NOTES
1 Test fluids other than water or valves without downstream piping are not within the scope of this
section of IEC 534-8.
is used in a noise prediction method which is covered in IEC 534-8-4 (under considera-
2 The factor xFZ
tion).
9 -
534-8-2 © IEC -
2 Normative references
The following standards contain provisions which, through reference in this text, constitute
provisions of this section of IEC 534-8. At the time of publication, the editions indicated
were valid. All standards are subject to revision, and parties to agreements based on this
section of IEC 534-8 are encouraged to investigate the possibility of applying the most
recent editions of the standards indicated below. Members of IEC and ISO maintain
registers of currently valid International Standards.
IEC 534-1: 1987, Industrial-process control valves - Part 1: Control valve terminology and
general considerations.
IEC 534-2-3: 1983, Industrial-process control valves - Part 2: Flow capacity - Section
Three: Test procedures.
IEC 534-8-4, Industrial-process control valves - Part 8: Noise considerations - Section
(under
Four: Prediction of noise generated by hydrodynamic flow through control valves
consideration).
IEC 651: 1979, Sound level meters.
ISO 7-1: 1982, Pipe threads where pressure-tight joints are made on the threads - Pa rt 1:
Designation, dimensions and tolerances.
ISO 65: 1981, Carbon steel tubes suitable for screwing in accordance with ISO 7-1.
ISO 3744: 1981, Acoustics - Determination of sound power levels of noise sources -
Engineering methods for free-field conditions over a reflecting plane.
ISO 3745: 1977, Acoustics - Determination of sound power levels of noise sources -
Precision methods for anechoic and semi-anechoic rooms.
ISO 4200: 1985, Plain end steel tubes, welded and seamless - General tables of
dimensions and masses per unit length.
3 Definitions
For the purpose of this section, the following definition applies as well as the definitions
given in other parts of IEC 534.
3.1 test specimen: Valve or combination of valve, reducer, expander, or other fittings
for which test data are required. All parts/accessories necessary the specimen
to operate
properly
shall be included.
- 11 -
534-8-2 © IEC
4 Test system
4.1 The test systems shown in figures 1 a and 1 b include:
a) pressure regulating devices;
b) test specimen;
c) test section piping;
d) pressure taps;
means of controlling the acoustic environment (chamber is optional);
e)
f) instrumentation.
The test system according to figure 1 a includes the control valve as a noise radiating
device.
The test system according to figure 1 b may be used as an alternative if more convenient,
or when the size of the control valve does not allow installation inside the test chamber.
4.1.1 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.
4.1.2 Test specimen insulation
The test specimen shall not be insulated; however, separate tests may be conducted to
determine the effects of pipe and/or valve insulation.
4.1.3 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. The piping on either side
of the test specimen shall conform to table 1 for valves having pressure ratings up to and
including PN 100.
For values outside the scope of table 1, 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).
-13 -
534-8-2 © IEC
4.1.4 Pressure taps
Pressure taps shall be provided for the measurement of pressures and shall conform to
IEC 534-2-3.
4.1.5 Acoustic environment
The test environment shall be controlled such that background, reflected and other
extraneous noise is at least 10 dB lower than that radiated by the test section. General
considerations for the acoustic environment can be found in ISO 3744 and ISO 3745.
4.1.6 Instrumentation
The instrumentation for sound level measurement and the microphone characteristics shall
conform to IEC 651. Microphone calibration and sensitivity test results shall be corrected
for ambient pressure to sea-level conditions.
5 Characteristic pressure ratio xFZ
The pressure ratio xF is given as follows:
Ap
X =
F
Pi - Pv
is increased sufficiently, there is a transition from non-cavitating to cavitating
When xF
flow. The pressure differential where the sound pressure level begins to increase due to
. The corresponding ratio is the characteristic
cavitation during this transition is Apk
pressure ratio xFZ and is defined as follows:
Apk
pv
xFz
pi -
Generally, xFZ varies with travel and shall be measured at relative flow coefficients of
0,25, 0,50, 0,75 and 1,00 or the highest one achievable. When necessary, additional mea-
surements with other relative flow coefficients should be included. With these values of
xFZ values for other relative flow
xFZ, linear interpolation may be used to obtain
See
at a relative flow coefficient $ is denoted as xFZ,4) .
coefficients. The value of xFZ
figure 3 for a typical curve of xFZ.
534-8-2©IEC - 15 -
6 Testing procedures
6.1 Test fluid
Water is the only fluid to be used in the test procedure, because other incompressible
fluids behave differently and do not allow a comparison of test data. The water shall be
sufficiently free from suspended particles, air, or other gases so as to ensure that the test
results are not affected. To accomplish this, the suitability of the water shall be tested first
by using a special orifice plate, which is to be considered the reference test orifice plate
(figure 4). This orifice plate shall be installed in a DN 50 (as defined in table 1) pipe (either
permanently in a bypass or by changing the test section piping). The characteristic
for the orifice plate shall be determined at an absolute upstream
pressure ratio xFZ
pressure between 300 kPa and 400 kPa (3 bar and 4 bar). The value of x FZ shall be not
less than 0,35. Water within a temperature range of 5 °C to 40 °C shall be the basic fluid
used in this test procedure. During the test, the temperature shall remain constant
within ±3 °C.
Other orifice plates may be used as an alternative provided the upstream pressure is as
stated above. The dimensions shown in figure 4 shall remain the same, except that the
diameters shall be changed to maintain the same opening ratio of 0,25.
6.2 Test conditions for determination of x
FZ
The determination of xFZ depends on many parameters. A detailed explanation is beyond
the scope of this section of IEC 534-8. To make the test results comparable, the following
test conditions shall be maintained:
a) Closed test loops shall be in accordance with figure 1 a or figure 1 b;
NOTE - Open loops may be used provided all requirements of this section of IEC 534-8 are met.
b)
Absolute upstream pressure pi shall be in the range of 500 kPa to 700 kPa (5 bar
to 7 bar). The selected test pressure shall be kept constant within ±5 %.
NOTE - Caution should be exercised not to exceed the rated service cond
...
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