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
🇮🇹
UNI EN ISO 3095
🇪🇸
UNE EN ISO 3095
🇳🇱
NEN EN ISO 3095
1,516
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17
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ÖNORM EN ISO 17637
BS EN ISO 15614-1:2017
ASTM A 370
DIN EN 10080
BS EN ISO 9015-1:2011
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DIN EN ISO 6508-1
ASTM E1019-24
ISO 13320
ISO 6892-2
(BS EN ISO 6892-1: 2019)
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RIO
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Parallelendmaße * 0,5 mm
DIN EN ISO 3650:1999
> 100 mm
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RMA Mess- und Regeltechnik
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Durchfluss von Gasen
Volumendurchfluss 50 m³/h
Railway brakes — brake performance (UIC
(Hochdruck Erdgas
5 bis 51 bar)
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ROTA YOKOGAWA
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Masse m strömender
− Durchfluss von Flüssigkeiten
Durchfluss von
1) In den CMC sind die erweiterten Messu
Massedurchfluss dm / dt
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Radiomotive
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ETSI EN 301 489-6
DIN EN 61326-2-6
IEC 61326-3-1
IEC 61326-3-2
IEC 60669-2-5
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Ramcare
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DC CURRENT
DC VOLTAGE
thermometer Pt100
ROTATIONAL SPEED
Generate
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Rhopoint Metrology
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(Steel and tungsten carbide)
LENGTH (cont’d)
pneumatic tyres (See Note 1)
LENGTH (cont.)
Plain plug gauges (taper)
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Richard L Thomas Associates
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(HSG 264, 2012)
HSG 264 (2012) and Appx. 3 of
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Appendix 5 of HSG 227 (2004))
(HSG 248) – 2021
OP11 based on HSG 248
(PCM) based on HSG 248
OP04 based on HSG 248
Robert Koch-Institut
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Salmonellen
Salmonella enterica, Shigellen, Yersinie
Shigellen
Salmonella sv. Paratyphi
Neisseria meningitidis, Listeria
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Charpy impact test (ISO 148-1)
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elektronische Waagen
1) In den CMC sind die erweiterten Messu
DIN EN ISO 12185
DIN EN ISO 3405
DIN EN 13016-1
DIN EN ISO 20884
DIN EN ISO 20846
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Spinocerebelläre Ataxien
Bindegewebserkrankungen: ACTA2, COL1A1,
HD; Chorea Huntington
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Dentatorubrale-Pallidoluysiane
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Rwanda Standards Board
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ISO 6222
AM09 based on BS ISO 21527-1:
ISO 6579-1
ISO 4832
ISO 2171
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DIN EN ISO 6507-1
DIN EN ISO 6508-1
NF X70-100-1
DIN EN 45545-2
NF X70-100-2
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Durchfluss von 2 m3/h bis 800 rn3/h
− Durchfluss von Flüssigkeiten
Volumendurchfluss
dV/dt von
strörnenden
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