VIBTOOL 02.2009
26
ISO vibration monitoring standard
In order to monitor vibration severity according to the ISO
10816-3 standard, the threshold values must be set accord-
ing to the appropriate machine classification. This classifi-
cation is determined according to machine power and
foundation characteristics as follows:
ISO 10816-3
Group 1: Large machines, 300 kW to 50 MW
Group 2: Medium-sized machines, 15 kW to 300 kW
Evaluation scale
A: Newly commissioned
B: Indefinite continuous service allowed
C: Short-term operation allowed
D: Vibration is causing damage
To evaluate the condition of your machine, simply read off
the vibration velocity on the right-hand scale and go across
the table until the correct machine class is reached.
Vibration velocity (r.m.s.)
(10 - 1000 Hz r > 600 min
-1
)
(2 - 1000 Hz r > 120 min
-1
)
Foundation
Machine type
Group
rigid elastic
rigid elastic
rigid elastic rigid elastic
Pumps radial, axial, diagonal
P > 15 kW
Med.-sized mach.
15 kW<P
<300 kW
Large machines
300 kW<P<50 MW
Direct drive Intermediate gear/
belt drive
Motors
160
<H<315 mm
Motors
315 mm
< H
Group 4 Group 3 Group 2 Group 1
D
C
B
A
mm/s
0.71
1.4
2.3
2.8
3.5
4.5
7.1
11
Action:
A: continue to make regular
measurements.
B,C: Take initial steps to locate
the source of the vibration.
Keep a close watch on the
machine and consider a
shutdown.
D: Take immediate steps to
locate the problem, shutdown
and correct.
Vibration measurements
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