| Group | Description | Examples | | :--- | :--- | :--- | | | Large machines on rigid foundations | Large pumps (>300 kW), compressors on massive concrete bases. | | Group 2 | Medium machines on rigid foundations | Typical industrial motors (15 kW – 300 kW) on rigid bases. | | Group 3 | Large machines on flexible foundations | Large pumps/compressors mounted on steel structures or lightweight foundations. | | Group 4 | Medium machines on flexible foundations | Medium motors/pumps on structural steel decks. |
Implementing this standard moves a facility from "reactive" to "predictive" maintenance. By following these benchmarks, companies can:
Create a universal language for contractors and in-house teams to discuss machine health.
| Zone | Designation | Description | Recommended Action | | :--- | :--- | :--- | :--- | | | Good | Vibration of newly commissioned machines. | Normal operation. No action required. | | Zone B | Acceptable | Machines are considered safe for unrestricted long-term operation. | Routine monitoring. | | Zone C | Unsatisfactory | Vibration is severe enough to cause damage. | Suitable for short-term operation; investigate root cause and schedule maintenance. | | Zone D | Dangerous | Vibration levels are high enough to cause catastrophic failure. | Immediate shutdown to prevent danger. |
To ensure fair evaluation, the standard divides machines into four groups based on size and foundation type: Rated power above 300 kW.