Scope
ISO 11820:2019
In-Situ Sound Attenuation Measurement of Silencers
ISO 11820 specifies the in-situ measurement method for determining the acoustic attenuation performance of silencers installed in railway ventilation ducts, brake systems, and exhaust lines. This test is critical for validating noise control equipment on operating trains and stationary installations where laboratory testing is impractical. Railway manufacturers, maintenance operators, and acoustic engineers use these measurements to verify compliance with noise regulations and to optimize silencer design. Accreditation ensures that attenuation claims are reliable and that performance targets for noise reduction are consistently achieved in real-world applications.
What it measures
- Sound pressure level reduction across silencer (dB)
- Attenuation performance by frequency band
- Insertion loss of silencer in situ
- Acoustic performance under operating conditions
- Noise transmission loss through silencer element
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DIN EN ISO 11821
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BS EN ISO 11821
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NF EN ISO 11821
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UNI EN ISO 11821
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UNE EN ISO 11821
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NEN EN ISO 11821
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DIN EN ISO 3095
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BS EN ISO 3095
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NF EN ISO 3095
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UNI EN ISO 3095
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UNE EN ISO 3095
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NEN EN ISO 3095
1,516
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17
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Kordt Messtechnik
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(ein- und mehrgängige
zylindrische Außen- und
geradlinigen Flanken und
symmetrischem Profil sowie
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Kordus Consulting
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and Appendix 3 of HSG 227 (2004))
Appendix 5 of HSG 227 (2004))
Kova Asbestos Consultants
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(HSG 248) – 2021
(PCM) based on HSG 248
SAS 02 based on HSG 248
Kovia
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Appendix 5 of HSG 227 (2004))
HSG 227 (2004)
HSG 264 (2012) and Appendix 3 of
Thrombozytenfunktion
Amiodaron/Desethylamiodaron
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Everolimus
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Durchfluss von Gasen 17 mL/s
transferstandards
Strömungswiderstand 5 mL/min
15,0 mL/min
Laminar Flow Elemente 17 mL/min
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Messschieber für Außen-, 0 mm
Innen- und Tiefenmaße
> 300 mm
Tiefenmessschieber 0 mm
Höhenmessschieber 0 mm
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(HSG 248) – 2021
(PCM) based on HSG 248
MAAM 05 based on HSG 248
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LAB-EXPERT
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NF X43-050 (parties utiles de la
NF X 43-050
NF ISO 22262-1 (parties utiles
LABAQUA, S.A. (Unipersonal)
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UNE-EN ISO 27888
SM 2540
UNE-EN ISO 8467
UNE-EN ISO 7027-1
UNE-EN ISO 10523
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DIN EN 13346
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DIN EN 17387
DIN EN ISO 22717
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0.95) based on BS ISO 21527-2:2008
DIN EN ISO 6888-2
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DIN EN 10002-1
BS ISO 9227:2022
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EN ISO 12624
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ISO 23318
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ISO 10390
UNE 77308
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DIN EN 15634-1
DIN EN ISO 15587-1
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ISO 14189
EPA 5030
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