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Measurement techniques always included
C:11
C
Definition of machine classes according to ISO 2372
The following text is a quotation from ISO 2372 (1974, E, page 6, Annex A). This ISO Recommenda-
tion has also been published as British Standard (BS 4675, part I). A similar vibration classification of
industrial machinery can be found in VDI 2056.
In order to show how the recommended method of classification may be applied, examples of
specific classes of machines are given below. It should be emphasized, however, that they are
simply examples and it is recognized that other classifications are possible and may be substituted
in accordance with the circumstances concerned. As and when circumstances permit, recommenda-
tions for acceptable levels of vibration severity for particular types of machines will be prepared. At
present, experience suggests that the following classes are appropriate for most applications.
Class I
Individual parts of engines and machines, integrally connected with the complete machine in its
normal operating condition. (Production electrical motors of up to 15 kW are typical examples of
machines in this category.)
Class II
Medium-sized machines, (typically electrical motors with 15 to 75 kW output) without special foun-
dations, rigidly mounted engines or machines (up to 300 kW) on special foundations.
Class III
Large prime movers and other large machines with rotating masses on rigid and heavy foundations
which are relatively stiff in the direction of vibration measurement.
Class IV
Large prime movers and other large machines with rotating masses on foundations which are rela-
tively soft in the direction of vibration measurement (for example turbogenerator sets, especially
those with lightweight substructures).
Class V
Machines and mechanical drive systems with unbalanceable inertia effects (due to reciprocating
parts), mounted on foundations which are relatively stiff in the direction of vibration measurement.
Class VI
Machines and mechanical drive systems with unbalanceable inertia effects (due to reciprocating
parts), mounted on foundations which are relatively soft in the direction of vibration measurements;
machines with rotating slackcoupled masses such as beater shafts in grinding mills; machines, like
centrifugal machines, with varying unbalances capable of operating as self-contained units without
connecting components; vibrating screens, dynamic fatigue-testing machines and vibration exciters
used in processing plants.