12. CLASSIFICATION RANGES
For the valuation of machines and equipment in the ISO
2372 and VDI 2056, four different kinds of machine groups
with four classification ranges and their limits for vibration
severity ( mm/s ) are determined.
The classifications for each machine group are specified as
follows :
Small machines, especially production electrical
motors of up to 15 KW ( Group K )
Good 0 to 0.71 mm/s
Acceptable 0.72 to 1.80 mm/s
Still permissible 1.81 to 4.5 mm/s
Dangerous > 4.5 mm/s
Medium sized machines, especially electrical
motors with 15 up to 75 KW output, without
special foundations ( Group M )
Good 0 to 1.12 mm/s
Acceptable 1.13 to 2.80 mm/s
Still permissible 2.81 to 7.1 mm/s
Dangerous > 7.1 mm/s
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