EN ISO 14163:1998
(Main)Acoustics - Guidelines for noise control by silencers (ISO 14163:1998)
Acoustics - Guidelines for noise control by silencers (ISO 14163:1998)
Akustik - Leitlinien für den Schallschutz durch Schalldämpfer (ISO 14163:1998)
Diese Internationale Norm befaßt sich mit der praktischen Auswahl von Schalldämpfern zur Lärmminderung in gasförmigen Medien. Sie legt die akustischen und betriebstechnischen Anforderungen fest, die zwischen dem Lieferanten oder Hersteller und dem Anwender eines Schalldämpfers zu vereinbaren sind. Diese Internationale Norm beschreibt die grundlegenden Wirkprinzipien, ist jedoch keine Anleitung für die Auslegung von Schalldämpfern.
Acoustique - Lignes directrices pour la réduction du bruit au moyen de silencieux (ISO 14163:1998)
Akustika - Smernice za varstvo pred hrupom z dušilniki (ISO 14163:1998)
General Information
Related Packages
Standards Content (Sample)
SLOVENSKI STANDARD
01-november-1999
Akustika - Smernice za varstvo pred hrupom z dušilniki (ISO 14163:1998)
Acoustics - Guidelines for noise control by silencers (ISO 14163:1998)
Akustik - Leitlinien für den Schallschutz durch Schalldämpfer (ISO 14163:1998)
Acoustique - Lignes directrices pour la réduction du bruit au moyen de silencieux (ISO
14163:1998)
Ta slovenski standard je istoveten z: EN ISO 14163:1998
ICS:
17.140.01 $NXVWLþQDPHUMHQMDLQ Acoustic measurements and
EODåHQMHKUXSDQDVSORãQR noise abatement in general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
INTERNATIONAL ISO
STANDARD 14163
First edition
1998-10-15
Acoustics — Guidelines for noise control
by silencers
Acoustique — Lignes directrices pour la réduction du bruit au moyen
de silencieux
A
Reference number
ISO 14163:1998(E)
ISO 14163:1998(E)
Contents
1 Scope .1
2 Normative references .1
3 Terms and definitions .2
4 Specification, selection and design considerations .4
4.1 Requirements to be specified .4
4.2 Selection and layout of silencers.4
4.3 Design of special silencers.5
5 Types of silencers, general principles and operational considerations .5
5.1 Overview.5
5.2 Acoustic and aerodynamic performance of silencers .7
5.3 Sound propagation paths .7
5.4 Acoustic installation effect .8
5.5 Abrasion resistance and protection of absorbent surfaces.9
5.6 Fire hazards and protection against explosion .9
5.7 Starting-up and closing-down of plants.9
5.8 Corrosion.9
5.9 Hygienic requirements and risk of contamination .9
5.10 Inspection and cleaning, decontamination.10
6 Performance characteristics of types of silencers.10
6.1 Dissipative silencers .10
6.2 Reactive silencers .22
6.3 Blow-off silencers .29
© ISO 1998
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic
or mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case postale 56 • CH-1211 Genève 20 • Switzerland
Internet iso@iso.ch
Printed in Switzerland
ii
© ISO
ISO 14163:1998(E)
7 Measurement techniques . 30
7.1 Laboratory measurements . 30
7.2 Measurements in situ. 31
7.3 Measurements on vehicles. 31
8 Information on silencers. 31
8.1 Information to be provided by the user. 31
8.2 Information to be provided by the manufacturer . 32
Annex A (informative) Applications . 33
Annex B (informative) Effect of spectral distribution of sound on the declaration of attenuation
in one-third-octave or octave bands. 40
Annex C (informative) Operating temperatures of sound sources and temperature limits of
sound-absorbent materials. 42
Bibliography. 43
iii
© ISO
ISO 14163:1998(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.
Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.
Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.
International Standard ISO 14163 was prepared by Technical Committee ISO/TC 43, Acoustics, Subcommittee
SC 1, Noise.
Annexes A to C of this International Standard are for information only.
iv
© ISO
ISO 14163:1998(E)
Introduction
Whenever airborne sound cannot be controlled at the source, silencers provide a powerful means of sound
reduction in the propagation path. Silencers have numerous applications and different designs based on various
combinations of absorption and reflection of sound, as well as on reaction on the sound source. This International
Standard offers a systematic description of principles, performance data and applications of silencers.
v
INTERNATIONAL STANDARD © ISO ISO 14163:1998(E)
Acoustics — Guidelines for noise control by silencers
1 Scope
This International Standard deals with the practical selection of silencers for noise control in gaseous media. It
specifies the acoustical and operational requirements which are to be agreed upon between the supplier or
manufacturer and the user of a silencer. The basic principles of operation are described in this International
Standard, but it is not a silencer design guide.
The silencers described are suitable, among others,
for attenuating system noise and preventing crosstalk in heating, ventilation and air-conditioning (HVAC)
equipment;
for preventing or reducing sound transmission through ventilation openings from rooms with high inside sound
levels;
for attenuating blow-off noise generated by high-pressure lines;
for attenuating intake and exhaust noise generated by internal combustion engines; and
for attenuating intake and outlet noise from fans, compressors and turbines.
They are classified according to their types, performance characteristics and applications. Active and adaptive
passive noise-control systems are not covered in detail in this International Standard.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of
this International Standard. For dated references, subsequent amendments to, or revisions of, any of these
publications do not apply. However, parties to agreements based on this International Standard are encouraged to
investigate the possibility of applying the most recent editions of the normative documents indicated below. For
undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC
maintain registers of currently valid International Standards.
ISO 3741, Acoustics — Determination of sound power levels of noise sources using sound pressures — Precision
methods for reverberation rooms.
ISO 3744, Acoustics — Determination of sound power levels of noise sources — Engineering methods for free-field
conditions over a reflecting plane.
ISO 7235, Acoustics — Measurement procedures for ducted silencers — Insertion loss, flow noise and total
pressure loss.
ISO 11691, Acoustics — Measurement of insertion loss of ducted silencers without flow — Laboratory survey
method.
ISO 11820, Acoustics — Testing of silencers in situ.
© ISO
ISO 14163:1998(E)
3 Terms and definitions
For the purposes of this International Standard, the following terms and definitions apply.
3.1
silencer
device reducing sound transmission through a duct, a pipe or an opening without preventing the transport of the
medium
3.2
dissipative silencer
absorptive silencer
silencer providing for broad-band sound attenuation with relatively little pressure loss by partially converting sound
energy to heat through friction in porous or fibrous duct linings
3.3
reactive silencer
general term for reflective and resonator silencers where the majority of the attenuation does not involve sound
energy dissipation
3.4
reflective silencer
silencer providing for single or multiple reflections of sound by changes in the cross-section of the duct, duct linings
with resonators, or branchings to duct sections with different lengths
3.5
resonator silencer
silencer providing for sound attenuation at weakly damped resonances of elements
NOTE The elements may or may not contain absorbent material.
3.6
blow-off silencer
silencer used in steam blow-off and pressure release lines throttling the gas flow by a considerable pressure loss in
porous material and providing sound attenuation by lowering the flow velocity at the exit and reacting on the source
of the sound (such as a valve)
3.7
active silencer
silencer providing for the reduction of sound through interference effects by means of sound generated by
controlled auxiliary sound sources
NOTE Mostly low-order modes of sound in ducts are affected.
3.8
adaptive passive silencer
silencer with passive sound-attenuating elements dynamically tuned to the sound field
3.9
insertion loss,
D
i
difference between the levels of the sound powers propagating through a duct or an opening with and without the
silencer
NOTE 1 The insertion loss is expressed in decibels, dB.
NOTE 2 Adapted from ISO 7235.
© ISO
ISO 14163:1998(E)
3.10
insertion sound pressure level difference
D
ip
difference between the sound pressure levels occurring at an immission point, without a significant level of
extraneous sound, without and with the silencer installed
NOTE 1 The insertion sound pressure level difference is expressed in decibels, dB.
NOTE 2 Adapted from ISO 11820.
3.11
transmission loss
D
t
difference between the levels of the sound powers incident on and transmitted through the silencer
NOTE 1 The transmission loss is expressed in decibels, dB.
NOTE 2 For standard test laboratories D equals D , whereas results for D and D obtained from in situ measurements may
t i t i
often differ due to limited measurement possibilities.
NOTE 3 Adapted from ISO 11820.
3.12
discontinuity attenuation
D
s
that portion of the insertion loss of a silencer or silencer section due to discontinuities
NOTE The discontinuity attenuation is expressed in decibels, dB.
3.13
propagation loss
D
a
decrease in sound pressure level per unit length which occurs in the midsection of a silencer with constant cross-
section and uniform longitudinal design, characterizing the longitudinal attenuation of the fundamenta
...
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