Vibration Severity: ISO_10816_3_SUMMARY
Machinery vibration severity evaluation criteria — zone boundaries (A/B/C/D) for bearing housing velocity (mm/s RMS) and shaft displacement (micrometers pk-pk) per ISO 10816-1/3, ISO 20816-1/2/3, ISO 7919-3, API 610/617/611/612, NEMA MG1, VDI 3839, and ISO 14694. Covers ISO 10816-3 Groups 1 and 2 (rigid and flexible mount), ISO 10816-1 Classes I–IV, API centrifugal pump/compressor/steam turbine limits, rotodynamic pump zones, hydraulic machine zones, reciprocating machine limits, fan vibration limits, general alarm/trip multipliers, and summary lookup records.
| standard class | zone or limit | description | machine group | mounting | notes | power kw min (kW) | unit | zone A max mm s (mm/s) | zone B max mm s (mm/s) | zone C max mm s (mm/s) | zone interpretation |
|---|---|---|---|---|---|---|---|---|---|---|---|
| ISO_10816_3_SUMMARY | CLASS_III_ZONES | Summary: Class III (>75 kW rigid) zone boundaries per ISO 10816-1 | Class_III_Large | rigid | Summary record; ISO 10816-1 Class III large rigid | 75 | mm/s RMS | 1.8 | 4.5 | 11.2 | A: 0-1.8; B: 1.8-4.5; C: 4.5-11.2; D: >11.2 |
| ISO_10816_3_SUMMARY | CLASS_IV_ZONES | Summary: Class IV (>75 kW flexible/turbomachinery) zone boundaries | Class_IV_Turbomachinery | flexible | Summary record; ISO 10816-1 Class IV large flexible mount and turbomachinery | 75 | mm/s RMS | 2.8 | 7.1 | 18 | A: 0-2.8; B: 2.8-7.1; C: 7.1-18.0; D: >18.0 |
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