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

1,516 Accredited labs

17 Countries

Showing 1–3 of 3 labs

IMPELAB

COFRAC 1-6403 Marrakech, MA

DIN EN ISO 7932 DIN EN ISO 6579-1 DIN EN ISO 7937 DIN EN ISO 11290-1 0.95) based on BS ISO 21527-2:2008 + 2 more

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Laboratoire Marocain de Métrologie Industrielle - L2MI

COFRAC 1-6426 12 Et 14 Lot. Mauritania Q.I Sidi Bernoussi | - Casablanca | Maroc, MA

DIN EN 12469 NF S 90-351 BS EN ISO 14644-1:2015 ISO 14644-3

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PROCESS INSTRUMENTS (PI)

COFRAC 1-5987 263, 3Eme Etage Zone Industrielle De Mohammedia | - Mohammedia | Maroc, MA

DIN EN 12469 NF S 90-351 BS EN ISO 14644-1:2015 ISO 14644-3

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No matching labs found.

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EN ISO 3095 Acoustics — Measurement of noise emitted by railbound vehicles
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