BS EN ISO 14163:1998

1 Scope
2 Normative references
3 Terms and definitions
4 Specifications, selection and design considerations
    4.1 Requirements to be specified
    4.2 Selection and layout of silencers
    4.3 Design of special silencers
5 Types of silencers, general principles and
    operational considerations
    5.1 Overview
    5.2 Acoustic and aerodynamic performance of silencers
    5.3 Sound propagation paths
    5.4 Acoustic installation effect
    5.5 Abrasion resistance and protection of absorbent
          surfaces
    5.6 Fire hazards and protection against explosion
    5.7 Starting-up and closing-down of plants
    5.8 Corrosion
    5.9 Hygienic requirements and risk of contamination
    5.10 Inspection and cleaning, decontamination
6 Performance characteristics of types of silencers
    6.1 Dissipative silencers
    6.2 Reactive silencers
    6.3 Blow-off silencers
7 Measurement techniques
    7.1 Laboratory measurements
    7.2 Measurements in situ
    7.3 Measurements on vehicles
8 Information on silencers
    8.1 Information to be provided by the user
    8.2 Information to be provided by the manufacturer
Annex A (informative) Applications
Annex B (informative) Effect of spectral distribution of
sound on the declaration of attenuation in one-third-octave
or octave bands
Annex C (informative) Operating temperatures of sound sources
and temperature limits of sound-absorbent materials
Bibliography

Establishes a practical selection of silencers for noise control in gaseous media. Defines the acoustical and operational requirements for agreement between the supplier, manufacturer or user of a silencer. Describes the basic operation principles, but is not intended to be a silencer design guide.

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.