Vibration Severity: API_612_TURBINE
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 |
|---|---|---|---|---|---|---|---|---|
| API_612_TURBINE | SHAFT_VIBRATION_LIMIT | API 612 special-purpose steam turbine shaft vibration limit | API_612_Turbine | any | API 612 (special-purpose): shaft vibration during mechanical test must not exceed 25.4 um (1 mil) pk-pk at rated speed; alert at 125% baseline; trip at 200% baseline or 51 um | micrometers pk-pk | 25.4 | Maximum shaft relative vibration at rated speed during mechanical running test |
This is a sample. Search the full vibration severity dataset and 300+ more by creating a free account and accessing the database.
Get started for FREERelated data
ALARM_TRIP_GENERAL2 rowsAPI_610_PUMP3 rowsAPI_611_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