Vibration Severity: ISO_20816_1_GENERAL
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 | 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_20816_1_GENERAL | VIBRATION_VELOCITY | ISO 20816-1 general guidelines for machinery vibration - velocity method | ISO_20816_General | any | ISO 20816-1:2016 supersedes ISO 10816-1; provides framework for parts 2-9; general applicability; specific machines use part-specific limits | mm/s RMS | 1 | 2.5 | 6.3 | General guidance zones A/B/C (Zone D >6.3 mm/s) |
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