The standard applies at rated speed. For VFD-driven pumps, measure at the speed where vibration is highest—typically around resonant frequencies.
| Zone | Description | Action Required | |------|-------------|------------------| | | Good – Vibration of new machines | No action needed | | Zone B | Satisfactory – Unrestricted long-term operation | Routine monitoring | | Zone C | Unsatisfactory – Operation limited in time | Plan maintenance within weeks | | Zone D | Unacceptable – Severe vibration | Immediate shutdown and repair | iso 10816-7 pdf download
The standard defines different velocity limits (mm/s RMS) based on the pump type, power rating, and support structure flexibility (rigid vs. flexible). Importance of Proper Measurement (Shaft vs. Housing) The standard applies at rated speed
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Measurements are generally recorded as root-mean-square (r.m.s.) vibration velocity in millimetres per second (mm/s). While exact thresholds depend on the rigidity of the foundation (rigid vs. flexible support), the general thresholds align as follows:
) thresholds tailored to your exact pump size and mounting style (flexible vs. rigid bases).
