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
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ÖNORM EN ISO 3452-1
ÖNORM EN ISO 17638
BS EN ISO 10675-1
ISO 10675-2
ISO 23277
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CALTECNICA INGENIEROS
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(3 ± 0,5) 10-2 mol/mol (5 ± 0,5) 10-
(5 ± 0,5) 10-2 mol/mol
- 80 ˚C a 200 ˚C
- 20 ˚C a < 23 ˚C 23 ˚C a 40 ˚C > 40 ˚C
- 20 ˚C a 60 ˚C
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CANAGROSA LAB&SERVICES
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Salt spray / neutral salt fog test (ISO
ISO 2808
ASTM D 2240
ISO 48-4
ASTM D 4809
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(0,15 ± 0,02) · 10-2 mol/mol (0,50 ± 0,0
(6,0 ± 1,0) · 10-2 mol/mol (11,5 ± 2,0)
(10 ± 2) · 10-6 mol/mol (50 ± 8) · 10-6
(0,15 ± 0,02) · 10-2 mol/mol (0,30 ± 0,0
1,000 ± 0,100
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Whole-body vibration — evaluation of hum
Railway ride comfort for passengers (EN
Railway running behaviour and bogies — t
Railway pass-by noise measurement (ISO 3
Railway interior noise measurement (ISO
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Sound intensity — scanning method (ISO 9
IEC 60695-2-10: 2013
IEC 60695-2-11
IEC 60695-11-5: 2016
IEC 60695-2-12: 2010
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ISO 13166
ISO 13164-4
OM H-3 based on ISO 9698:2019
ISO 18589-5:2009 by gas
ISO 10704
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UNE-EN ISO 5667-19
UNE-EN ISO 16665
UNE-EN 19493
ISO 5667-11
ISO 1928
ISO 1171
ISO 19579
ISO 29541
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DIN EN ISO 3745
ISO 3071
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ISO 16321-2
ISO 16321-3
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IEC 60068-2-1
IEC 60068-2-2
IEC 60068-2-78
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UNE-EN 60068-2-1
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Railway brake disc acoustic emissions (E
Pt 500
ID179
UNE-EN 200
CLOVER TECHNOLOGIES
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ISO/IEC 18045
ISO/IEC 15408-1
ISO/IEC 15408-2
ISO/IEC 15408-3
ISO/IEC 15408-4
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CEM EL-025
EURAMET cg-11
EURAMET cg-15
CEM EL-010
CEM EL-020
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ISO 22980
UNE 118019
UNE 118012
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UNE 118021-2
CONSORCI DE MEDI AMBIENT I SALUT PÚBLICA DE LA GARROTXA (SIGMA) LABORATORI POLIVALENT DE LA GARROTXA
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UNE-EN ISO 10304-1
UNE-EN ISO 7027-1
UNE-EN ISO 10523
UNE EN 27888
UNE-EN 872
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Railway wheel-rail interaction — roughne
IEC 61400-12-1
IEC 61400-50-1
IEC 61400-12-3
IEC 61400-12-5
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Radiated emissions (CISPR 32)
Influenza A/H1-2009
DIN 27201-5
ISO 20653
DIN EN IEC 60068-2-11
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DIPE ELECTRÓNICA
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0 mV U < 330 mV 330 mV U < 3,3 V 3,3
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0 A I 330 A 330 A < I 3,3 mA 3,
20 A I 1025 A
20 A I 1025 A F = 50 Hz
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UNE-EN ISO 11885
SM 4500-H+ B
SM 5210 D
SM 2130 B
SM 5220 D
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50 ∙ 10-9 mol/mol ≤ C ≤ 237 · 10-9 mol/m
30∙ 10-9 mol/mol ≤ C ≤ 500 ∙ 10-9 mol/mo
50 ∙ 10-9 mol/mol ≤ C ≤ 1000 · 10-9 mol/
50 ∙ 10-9 mol/mol ≤ C ≤ 237∙ 10-9 mol/mo
0,5 ∙ 10-9 mol/mol ≤ C ≤ 15 ∙ 10-9 mol/m
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200 kg/h ≤ m ≤ 60000 kg/h
200 l/h ≤ Q ≤ 60000 l/h
200 kg/h ≤ m ≤ 30000 kg/h
200 l/h ≤ Q ≤ 30000 l/h
700 Pa ≤ P ≤ 2 MPa
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nach DIN EN ISO 3650:1999
Laktoseintoleranz, 13910
DIN EN ISO 6887-5
ASTM E 23-18
ASTM E 10-18
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