Vibration Severity: NEMA_MG1_VIBRATION
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 C max mm s (mm/s) | zone interpretation |
|---|---|---|---|---|---|---|---|---|
| NEMA_MG1_VIBRATION | DISPLACEMENT_LIMIT | NEMA MG1 motor vibration displacement limit | NEMA_MG1_Motor | any | NEMA MG1 sleeve bearing motors; proximity probe or seismic measurement; check against MG1 Table 7-1 for specific frame sizes | micrometers pk-pk | 50.8 | Double amplitude displacement limit for sleeve bearing motors 50.8 um (2 mils) pk-pk |
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