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
1,273
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15
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Showing 276–299 of 299 labs
Tru-Cal Metrology
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including dial and digital
LENGTH (cont’d)
Plain plug gauges (taper)
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Plain ring gauges (taper)
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Tyneside Standards
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Micrometers
See Notes 3 and 5
See Note 6
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length bars) – See Note 5
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FNED142 BS EN ISO 11816-
FNES67 (P1) based on BS EN ISO
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FNES16 (F13) based on BS EN
ISO 6579-1
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UL International (UK)
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DIN EN 12209
DIN EN 1155
DIN EN 12179
DIN EN 1935
DIN EN 1670
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UL VS
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(HSG 264, 2012)
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guides HSG 264 (2012) and
ACoP L8 and BS 8580-1:2019
Uniper Technologies
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DIN EN 13284-1
BS EN ISO 23210:2009
requirements of BS EN 14181:2014
IEC 60519-11
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University of Salford
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DIN EN 12667
ISO 8301
DIN EN 12939
DIN EN 12664
DIN EN ISO 13163
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University of Salford
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University of Salford
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BS EN ISO 10140-2:2021
DIN EN ISO 11654
ISO 354
ISO 7171
ASTM E90-09(2016)
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ASB/10 based on HSG 248
(PCM) based on HSG 248
ASB/6 based on HSG 248
BS EN ISO 14644-1:2015
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VWR International
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parameters and ranges)
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Vintec Laboratories
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(HSG 248) – 2021
(PCM) based on HSG 248
P052 based on HSG 248
WSP UK
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(HSG 248) – 2021
AFC based on HSG 248
(PCM) based on HSG 248
SSA based on HSG 248
Wessex Power Technology
Active
TEMPERATURE
controllers, and recorders)
RELATIVE HUMIDITY
Analysts’ Guide (HSG 248)
(PCM) based on HSG 248
staining based on HSG 248
(HSG 248) – 2021
SOP 12 based on HSG 248
(PCM) based on HSG 248
SOP 11 based on HSG 248
Westward Laboratories
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ISO 21528-2
BS ISO 4832:2006
BS ISO 16649-2:2001
Method No 2.9 based on BS EN ISO
Method No 2.12 based on BS EN
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Wil-Test Solutions
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BS 1377-2:2022
BS 1377-9:1990
DIN EN 1097-5
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Winkhaus (UK)
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DIN EN 12046-2
DIN EN 12094-8
DIN EN 949
BS 6375-2:2009
DIN EN 950
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i2 FAST
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BS 4401-1:1998 Using
N008-1 based on BS EN
ISO 12966-4 2015
N008-2 based on BS EN
N011 based on BS 4401-9:1975 and BS 770-
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ifp-labs UK West Yorkshire
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on BS 4401:Part 3:1970(1986)
ISO 12966-1:2014 and
ISO 12966-4
CH 4026 based on BS 5766:Part
CH 4001 based on BS EN 12014-
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