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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NBN EN ISO 11821
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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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NBN EN ISO 3095
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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
2,775
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S.E. CARBUROS METÁLICOS
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15 · 10-6 mol/mol C 3500 · 10-6 mol/
0,03 · 10-2 mol/mol C < 0,3 · 10-2 mol
0,3 · 10-2 mol/mol C 1,1 · 10-2 mol/
1,1 · 10-2 mol/mol ≤ C < 26 · 10-2 mol/m
1,1 · 10-2 mol/mol ≤ C < 26 · 10-2 mol/m
+ 3 more
(15 ± 1) ⋅ 10-6 mol/mol (1000 ± 50) ⋅ 10
(8 ± 0,5) ⋅ 10-2 mol/mol (1,4 ± 0,1) ⋅ 1
(3000 ± 150) ⋅ 10-6 mol/mol (9 ± 1) ⋅ 10
(80 ± 8) ⋅ 10-6 mol/mol
(100 ± 8) ⋅ 10-6 mol/mol
SEQUOPRO
Active
0,015 l/min ≤ Q ≤ 40 l/min
0,0 · 10-9 mol/mol
20 ⋅ 10-9 mol/mol ≤ C ≤ 500 ⋅ 10-9 mol/m
0,00 · 10-6 mol/mol
0,5 ⋅10-6 mol/mol ≤ C ≤ 10 ⋅10-6 mol/mol
+ 3 more
OIV-MA-AS312-01
OIV-MA-AS2-01
OIV-MA-AS323-04A1
OIV-MA-AS323-04A2
OIV-MA-AS313-01
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1 mg 2 mg 5 mg 10 mg 20 mg 50 mg 100 mg
10 g 20 g 50 g 100 g 200 g 500 g 1 kg 2
.1 mg 2 mg 5 mg 10 mg 20 mg 50 mg 100 mg
SERVICIO REGIONAL DE INVESTIGACION Y DESARROLLO AGROALIMENTARIO DEL PRINCIPADO DE ASTURIAS (SERIDA)
Active
ISO 750
UNE-EN ISO 13906
UNE-EN ISO 16472
UNE-EN ISO 12099
OIV-MA-AS2-03B
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CEM DI-008
CEM DI-021
CEM DI-005
CEM DI-022
CEM DI-029
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DIN EN ISO 7500-1
ASTM E 18-22
ISO 7500-1
ISO 6508-2
ASTM D2240-15
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Radiated emissions (CISPR 32)
Railway wheel-rail interaction — roughne
IEC 61000-4-2: 2008
IEC 61000-4-3: 2006
IEC 61000-4-4: 2012
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ISO 18787
ISO 4832
ISO 15214
ISO 21527-1
ISO 21527-2
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(5 ± 0,2) · 10-2 mol/mol
(1000 ± 50) · 10-6 mol/mol
(15 ± 2) · 10-6 mol/mol
UNE-EN 12341
20 ⋅ 10-9 mol/mol ≤ C ≤ 500 ⋅ 10-9 mol/m
0,015 l/min ≤ Q ≤ 50 l/min
20 ⋅10-9 mol/mol ≤ C ≤ 100 ⋅ 10-9 mol/mo
100 ⋅ 10-9 mol/mol ≤ C ≤ 1000 ⋅ 10-9 mol
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ISO 9727-5
UNE-EN ISO 9308-1
OIV-MA-AS312-01
OIV-MA-AS2-01
OIV-MA-BS-06
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THOR ESPECIALIDADES
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IEC 60127-6
DIN EN 13697
DIN EN 1650
DIN EN 17658
DIN EN 13727
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Vickers hardness test (ISO 6507)
OMIM# 237500
ASTM D 2240
BS EN ISO 6508:2023
ISO 6507-2
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UNE-EN 50508
UNE-EN IEC 61243-1
UNE-EN 60903
UNE 204001
UNE-EN 61111
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UNIMETRIK
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CEM DI-012
CEM DI-008
CEM DI-021
CEM DI-005
UNE-EN ISO 10360-2
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UNE-EN 60947-5-1
UNE-EN 81-1
UNE-EN 81-2
UNE-EN 81-50
UNE-EN 81-20
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UNIVERSITAT DE GIRONA
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UNE-EN ISO 10523
UNE EN 27888
UNE-EN 872
UNE-EN ISO 6878
UNE-EN 25663
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URIKER
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DIN EN ISO 19458
ISO 15705
ISO 10390
Procedures (based on ISO 5667-
ISO 15923-1
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UNE 73109
IEC 60780 (1998)
UNE 73109 (2001)
ISO 28218
ISO 27048
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