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

🇩🇪 DIN EN ISO 11821 🇬🇧 BS EN ISO 11821 🇫🇷 NF EN ISO 11821 🇮🇹 UNI EN ISO 11821 🇪🇸 UNE EN ISO 11821 🇳🇱 NEN EN ISO 11821 🇩🇪 DIN EN ISO 3095 🇬🇧 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 51–53 of 53 labs

SNCF - AGENCE D'ESSAIS FERROVIAIRE

COFRAC 1-6879 Vitry Sur Seine, FR

ISO 13737 NF ISO 22286 ASTM D 2137 NF F19-503 NF T60-190 + 3 more

View Profile

SOCIETE FRANÇAISE DE CERAMIQUE

COFRAC 1-0062 Les Ulis, FR

DIN EN ISO 10545-3 DIN EN 997 DIN EN ISO 10545-4 DIN EN ISO 10545-14 DIN EN ISO 10545-6 + 3 more

View Profile

TERANA PUY-DE-DOME

COFRAC 1-6120 Lempdes, FR

NF T 90-412 NF U47-101 DIN EN ISO 7899-1 DIN ISO 16649-2 DIN EN ISO 6888-2 + 3 more

View Profile

No matching labs found.

ISO 11821 Acoustics — In-situ measurement of sound insulation of windows and façades
EN ISO 3095 Acoustics — Measurement of noise emitted by railbound vehicles
ISO 7235 Acoustics — Laboratory measurement of sound absorption coefficient of materials in impedance tubes