Vibration Severity: ALARM_TRIP_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 C max mm s (mm/s) | zone interpretation |
|---|---|---|---|---|---|---|---|---|
| ALARM_TRIP_GENERAL | ALERT_LEVEL | General machinery alert (alarm) threshold multiplier | General_Alarm | any | Common practice per ISO 20816-1 Annex C and API 670; alert (alarm) set at 1.25x accepted baseline; trip at 2.0x baseline or applicable zone C/D boundary whichever is lower | x baseline | 1.25 | Alert set at 125% of initial baseline vibration level |
| ALARM_TRIP_GENERAL | TRIP_LEVEL | General machinery danger (trip) threshold multiplier | General_Trip | any | Trip (shutdown) at 2.0x accepted baseline or zone D boundary; applies to non-API critical machines; API machines use API 670 | x baseline | 2 | Trip set at 200% of initial baseline vibration level |
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API_610_PUMP3 rowsAPI_611_TURBINE1 rowAPI_612_TURBINE1 rowAPI_617_COMPRESSOR2 rowsISO_10816_1_CLASS_I1 rowISO_10816_1_CLASS_II1 rowISO_10816_1_CLASS_III1 rowISO_10816_1_CLASS_IV1 rowISO_10816_3_GRP1_FLEXIBLE3 rowsISO_10816_3_GRP1_RIGID3 rowsISO_10816_3_GRP2_FLEXIBLE3 rowsISO_10816_3_GRP2_RIGID3 rows