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ISO 10816 Part 3
Part 3 treats most of the common industrial machines and is divided into four groups. Further criteria for
Part 3 are the rigidity of the foundation and the rotational speed. Concrete foundations are rigid, every
thing else falls under flexible. The RPM affects the lower measuring range as well as the limit values.
Support class Condition DISP VEL
Zone boundary RMS displacement RMS velocity
µm mils mm/s in/s
Rigid Green / Yellow 57 2.24 4.5 0.18
Yellow / Red 90 3.54 7.1 0.28
Flexible Green / Yellow 90 3.54 7.1 0.28
Yellow / Red 140 5.51 11.0 0.43
Group 1
Evaluation zone boundaries for machines of Group 1: Large machines with rated power above 300 kW
and not more than 50 MW; electrical machines with shaft height H ≥315 mm.
Support class Condition DISP VEL
Zone boundary RMS displacement RMS velocity
µm mils mm/s in/s
Rigid Green / Yellow 45 1.77 2.8 0.08
Yellow / Red 71 2.80 4.5 0.18
Flexible Green / Yellow 71 2.80 4.5 0.18
Yellow / Red 113 4.45 7.1 0.28
Group 2
Evaluation zone boundaries for machines of Group 2: Medium-size machines with rated power above
15 kW up to and including 300 kW; electrical machines with shaft height 160 mm ≤ H <315 mm.
Support class Condition DISP VEL
Zone boundary RMS displacement RMS velocity
µm mils mm/s in/s
Rigid Green / Yellow 36 1.42 4.5 0.18
Yellow / Red 56 2.20 7.1 0.28
Flexible Green / Yellow 56 2.20 7.1 0.28
Yellow / Red 90 3.54 11.0 0.43
Group 4
Evaluation zone boundaries for machines of Group 4: Pumps with multivane impeller and with integrated
driver (centrifugal, mixed flow or axial flow) with rated power above 15 kW.
Support class Condition DISP VEL
Zone boundary RMS displacement RMS velocity
µm mils mm/s in/s
Rigid Green / Yellow 22 0.87 2.8 0.08
Yellow / Red 36 1.42 4.5 0.18
Flexible Green / Yellow 36 1.42 4.5 0.18
Yellow / Red 56 2.20 7.1 0.28
Group 3
Evaluation zone boundaries for machines of Group 3: Pumps with multivane impeller and with separate
driver (centrifugal, mixed flow or axial flow) with rated power above 15 kW.
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