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Environment Protection Authority

Appendix C Vibration criteria presented in different units

C1 Criteria for exposure to continuous and impulsive vibration

The criteria presented in Table C1.1 for continuous vibration relate to vibration that continues uninterrupted for a defined period (usually throughout the daytime or night-time), e.g. continuous construction or maintenance activity.

The criteria presented in Table C1.1 for impulsive vibration relate to vibration that builds up rapidly to a peak followed by a damped decay and that may or may not involve several cycles of vibration (depending on frequency and damping), with up to three occurrences in an assessment period, e.g. occasional loading and unloading, or dropping of heavy equipment.

Table C1.1 Criteria for exposure to continuous and impulsive vibration

 Assessment criteria
 1rms acceleration (m/s2;)
(& vib. accel. value)
(dB re 10-6 m/s2)
2rms velocity (mm/s)
(& vib. velocity value)
(dB re 10-6 mm/s)
2Peak velocity
(mm/s)
PlaceTimePreferredMaximumPreferredMaximumPreferredMaximum
Continuous vibration
Critical working areas (eg hospital operating theatres precision laboratories)Day or night-time0.00500.0100.100.200.140.28
(74 dB)(80 dB)(100 dB)(106 dB)  
ResidencesDaytime30.0100.0200.200.400.280.56
(80 dB)(86 dB)(106 dB)(112 dB)  
Night-time0.00700.0140.140.280.200.40
(77 dB) (83 dB)(103 dB) (109 dB)  
OfficesDay or night-time0.0200.0400.400.800.561.1
(86 dB)(92 dB)(112 dB)(118 dB)  
WorkshopsDay or night-time0.0400.0800.801.61.12.2
(92 dB)(98 dB)(118 dB)(124 dB)  
Impulsive vibration
Critical working aresa (eg hospital operating theatres precision laboratories)Day or night-time0.00500.0100.100.200.140.28
(74dB)(80 dB)(100 dB)(106 dB) 

 

ResidencesDaytime30.300.606.012.08.617.0
(110 dB)(113 dB)(136 dB)(142 dB) 

 

Night-time0.100.202.04.02.85.6
(100 dB)(106 dB)(126 dB)(132 dB)  
OfficesDay or night time0.641.2813.026.018.036.0
(116 dB)(122 dB)(142 dB)(148 dB)  
WorkshopsDay or night time0.641.2813.026.018.036.0
(116 dB)(122 dB)(142 dB)(148 dB)  

1 Values derived from z-axis critical frequency range 4-8 Hz. Where required, a more detailed analysis can be conducted as per BS 6472-1992.

2 Values given for the most critical frequency range >8 Hz assuming sinusoidal motion. Where required, a more detailed analysis can be conducted as per AS 2670.2-1990. Sufficient justification should accompany the use of a peak velocity approach if used in an assessment.

3 Specific values depend on social and cultural factors, psychological attitudes and expected degree of intrusion.

Page last updated: 12 June 2013