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
🇧🇪 NBN EN ISO 11821 🇩🇪 DIN EN ISO 11821 🇬🇧 BS EN ISO 11821 🇫🇷 NF EN ISO 11821 🇮🇹 UNI EN ISO 11821 🇪🇸 UNE EN ISO 11821 🇳🇱 NEN EN ISO 11821 🇧🇪 NBN EN ISO 3095 🇩🇪 DIN EN ISO 3095 🇬🇧 BS EN ISO 3095 🇫🇷 NF EN ISO 3095 🇮🇹 UNI EN ISO 3095
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Chemisch-Technisches Laboratorium Luers

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ConCert Servicezentrum Bayerischer Untermain

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Railway braking — adhesion under braking - Gleichstromwiderstand Widerstände / Messgeräte >1 MΩ + 3 more
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Conatex Ludwig Colbus

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DBI - Gastechnologisches Institut gGmbH Freiberg DVGW-Prüflaboratorium Energie

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DEUTZ Aktiengesellschaft Kalibrierstelle für physikalische Größen

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DEW Waagen & Systeme

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Charpy impact test (ISO 148-1) Salt spray / neutral salt fog test (ISO elektronische Waagen − Waagen nichtselbsttätige
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DIAL

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DIFK Deutsches Institut für Feuerfest und Keramik

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DIK Prüfgesellschaft

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DNV Energy Systems Germany

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Industries

Railway rolling stock manufacturing Train maintenance and depot operations Acoustic engineering and noise control HVAC and ventilation system design Brake system suppliers and integrators

Related Standards

  • 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

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