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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cartridges, based on HTM 2030
9.201 to 9.212 and BS EN ISO
35 °C/3 days based on HTM 2030
section 9.201 to 9.212, BS EN
ISO 15883-1:2009 6.4.2.3 and
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4-RAIL Services
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(HSG 248) – 2021
E203 based on HSG 248
(PCM) based on HSG 248
E200 based on HSG 248
E201 based ISO 14966:2019 using
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ABLE Calibration Services
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TEMPERATURE
PRESSURE
AC VOLTAGE (continued)
DC VOLTAGE
Generation only
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staining based on HSG 248
QP23 based on HSG 248
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(HSG 264, 2012)
HSG 227 (2004)
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(PCM) based on HSG 248
ALS Laboratories (UK)
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on BS 4401:Part 3:1970(1986)
ISO 12966-2
AM/C/108 based on BS EN ISO
BS 684 2.14:2001
BS EN 288-Part 9 :1999
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APEC Environmental
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QOP03 based on HSG 248
QOP01 based on HSG 248
(HSG 248) – 2021
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AS International Corporation
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ISO 5983-1:2005/Cor.1:2008, ISO20483:201
07L.1.07 based on ISO 6865:2001
ISO 712
07L.1.02 based on ISO 6496:1999,
ISO 12966-2
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AWE
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LQP007 based on HSG 248
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(PCM) based on HSG 248
the guidance of GPG 14
PERSONAL DOSE EQUIVALENT:
RESPONSE:
Absolute Calibration
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DC Resistance
CFH-Gen, Macula-Degeneration
DC RESISTANCE (continued)
DC VOLTAGE
DC VOLTAGE (continued)
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(PCM) based on HSG 248
staining based on HSG 248
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Appendix 5 of HSG 227
ISO 11654
BS EN ISO 10140-2:2021
ISO 7171
ISO 354
BS EN ISO 10140-3:2021
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DIN EN 13727
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Air Surveys
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APP 7 based on HSG 248
(PCM) based on HSG 248
(PCM) based on HSG 248)
APP 15 based on HSG 248
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