0 137 1 . f e 133 r ( B d 129 V 125 y t i 121 c o l e 117 V S 113 M R 109 105
45 28 18
) 11.2 s / 7.1 m m ( 4.5 y t 2.8 i c o 1.8 l e V S1.12 M R0.71
Not Permissible 8 dB (x 2.5)
Just tolerable Allowable Good
0.45 0.28
Small machines, up to 15 kW
0.18
Group K
Not Permissible Just tolerable Allowable Good Medium machines 15-75 kW or up to 300 kW on special foundations
Group M
Not Permissible Just tolerable
Not Permissible
1.10 0.77
Just tolerable
0.44
Allowable
0.18
Allowable
0.28
0.11
Good
Good
1.77
0.07 0.04
) s / h c n i ( y t i c o l e V S M R
Large machines with Large machines ope- 0.03 rating at speeds rigid and heavy foun- dations whose natural above foundation 0.02 frequency exceeds natural frequency machine speed (e.g. Turbo-machinery) 0.01
Group G
Group T
ISO 10816-4 10816-4 For Gas Gas turbine turbine driven sets
Zone boundary
Vibration Velocity Velocity mm/s (r.m.s)
Vibration Velocity inch/s (r.m.s)
A/B
4.5
0.18
B/C
9.3
0.36
C/D
14.7
0.57
Note: These values, which are the upper limits of zones A, B and C respectively, should apply to radial vibration measurements on all bearing housings or pedestals and to axial vibration measurements on housings containing thrust bearing, under steadystate operating conditions at rated speed.
Recommended limits of vibration severity ISO 2373
A Single set of values, e.g. those applicable to the 132 to 225 mm shaft height, may be used if shown by experience to be required
