Vibration Severity: API_610_PUMP
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 |
|---|---|---|---|---|---|---|---|---|---|---|
| API_610_PUMP | BEARING_VEL_BEP | API 610 centrifugal pump bearing housing vibration at BEP | API_610_Pump | any | API 610 Table 11 - bearing housing vibration limit at BEP and preferred operating range; horizontal pump. Overhang limit 3.0 mm/s overall; discrete frequency limit 2.0 mm/s. 1.3x multiplier applies outside POR. Source: API 610 12th Ed (2021) Table 11 | mm/s RMS | 3 | 3 | 5.1 | Acceptable: <=3.0 mm/s; alarm threshold 3.0 mm/s; trip threshold varies by pump type |
| API_610_PUMP | BEARING_VEL_POR | API 610 pump bearing housing vibration in preferred operating range | API_610_Pump | any | Overall velocity limit 3.0 mm/s within POR; 3.0 x 1.3 = 3.9 mm/s at edges of AOR; vertical pumps 5.1 mm/s limit; discrete frequency within POR 2.0 mm/s | mm/s RMS | 3 | 3 | 5.1 | Acceptable: <=3.0 mm/s; restricted operation outside POR up to 3.9 mm/s |
| API_610_PUMP | BEARING_VEL_VERTICAL | API 610 vertical pump bearing housing vibration limit | API_610_Pump | any | Vertical turbine pumps and bowl assemblies per API 610 12th Ed; higher limit accounts for axial flexibility of vertical column | mm/s RMS | 5.1 | 5.1 | 5.1 | Vertical pump overall velocity limit 5.1 mm/s at BEP/POR |
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ALARM_TRIP_GENERAL2 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