ISO Standard 2372
The ISO standard number 2372 provides vibration amplitude acceptance guidelines for rotating machinery operating from 600 to 12000 RPM. It specifies overall vibration velocity levels rather than spectral levels, and can therefore be quite misleading.
ISO 2372 specifies the RMS vibration velocity limits on a basis of machine horsepower, and covers a frequency range from 10 Hz to 1000 Hz. Because of the limited high frequency range, rolling element-bearing problems can be easily missed. This standard is considered obsolete, and is about to be rewritten.
|
Level, VdB |
Level, IPS |
Less Than 20 HP |
20 to 100 HP |
More Than100 HP |
|
125
|
1.00
|
Not Permissible
|
Not Permissible
|
Not Permissible
|
|
121
|
0.63
|
Not Permissible
|
Not Permissible
|
Just Tolerable
|
|
117
|
0.40
|
Not Permissible
|
Just Tolerable
|
Just Tolerable
|
|
113
|
0.25
|
Just Tolerable
|
Just Tolerable
|
Allowable
|
|
109
|
0.16
|
Just Tolerable
|
Allowable
|
Allowable
|
|
105
|
0.10
|
Allowable
|
Allowable
|
Good
|
|
101
|
0.06
|
Allowable
|
Good
|
Good
|
|
97
|
0.04
|
Good
|
Good
|
Good
|
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