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
🇫🇷
NF EN ISO 3095
🇮🇹
UNI EN ISO 3095
🇪🇸
UNE EN ISO 3095
🇳🇱
NEN EN ISO 3095
1,273
Accredited labs
15
Countries
Showing 51–75 of 299 labs
Asbestos Survey & Management
Active
QOP03 based on HSG 248
QOP01 based on HSG 248
(HSG 248) – 2021
(PCM) based on HSG 248
AstraZeneca UK
Active
DC CURRENT
AC VOLTAGE (continued)
AC CURRENT
AC Voltage
DIMENSIONAL
+ 3 more
Analysts’ Guide (HSG 248)
(HSG 248) – 2021 Asbestos: The
(PCM) based on HSG 248
Ayerst Environmental
Active
(HSG 248) – 2021 )
(PCM) based on HSG 248
Surveying) based on HSG 248
BS EN ISO 10140-2:2021
BS EN ISO 10140-3:2021
BS EN ISO 717-2:2020
ISO 7171
BS EN ISO140-3:1995 (withdrawn)
+ 3 more
Babcock Marine [Rosyth]
Active
(HSG 248) – 2021
14B based on HSG 248
DIN EN 12021
14A based on HSG 248
(PCM) based on HSG 248
+ 2 more
Birmingham City Council
Active
(HSG 248) – 2021 )
(PCM) based on HSG 248)
(PCM) based on HSG 248
staining based on HSG 248
(HSG 264, 2012)
staining based on HSG 248
(HSG 248) – 2021
(PCM) based on HSG 248
(HSG 264:2012)
Bridgend Asbestos Services
Active
(HSG 248) – 2021
P10.2 based on HSG 248
(PCM) based on HSG 248
Based on ISO 10312:2019 and ISO
SOP 16 by XRD (ISO BS EN
C G C Laboratory
Active
(HSG 248) – 2021
(PCM) based on HSG 248
SOP 5, based on HSG 248
SOP 4, based on HSG 248
C.W.E. Services
Active
(HSG 264, 2012)
HSG 227 (2004))
Safety Executive guides HSG 264
(2012) and App 3 of HSG 227
(HSG 248) – 2021
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DIN EN 13284-1
BS ISO 9096:2017
requirements of BS EN 15259:2007
Standard and BS EN 15259:2007
DIN EN ISO 16911-1
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DC VOLTAGE
DC Resistance
DC CURRENT
AC Current Generation
Generation (continued)
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Campbell Associates
Active
Sound Calibrators
FREQUENCY
Microphones
based:
½” & ¼” microphones @ 250 Hz
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BS ISO 488:2008, 2446:2008 and
on BS 4401:Part 3:1970(1986)
BS 696-2:1989 (superseded and
BS ISO 6731:2010
ISO BS EN 3727-1:2002
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