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Group M Group G Group T

Just Just tolerabletolerable


AllowableAllowable


AllowableAllowable

AllowableAllowable

NotNotPermissiblePermissible



Group K

GoodGoodGoodGood

GoodGoodGoodGood

Medium machines15-75 kW or up to300 kW on special

foundations

Large machines withrigid and heavy foun-dations whose natural frequency exceeds machine speed

Large machines ope-rating at speedsabove foundationnatural frequency

(e.g. Turbo-machinery)

Small machines,up to 15 kW

AllowableAllowable


8 dB (x 2.5)


RM

S V

eloc

ity

(mm

/s)

45

28

18

11.2

7.1

4.5

2.8

1.8

1.12

0.71

0.45

0.280.18

153

149

145

141

137

133

129

125

121

117

113

109

105

RM

S V

eloc

ity

V d

B(r

ef. 1

0-6

mm

/s)

1.77

1.10

0.77

0.44

0.28

0.18

0.11

0.07

0.04

0.03

0.020.01

RM

S V

eloc

ity

(in

ch/s

)

ISO StandardISO Standard

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 steady-state operating conditions at rated speed.

0.5714.7C/D

0.369.3B/C

0.184.5 A/B

Vibration Velocityinch/s (r.m.s)

Vibration Velocitymm/s (r.m.s)

Zone boundary

ISO 10816-4 For Gas turbine driven sets

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

ISO 1940