Vibration Severity: ISO_14694_FANS
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_14694_FANS | ZONE_LIMITS_BAL_QUALITY | ISO 14694 industrial fans - residual unbalance limits | ISO_14694_Fan | any | ISO 14694:2003 specifies balance quality grades for industrial fans; G2.5 for precision fans (HVAC centrifugal); G6.3 for general industrial fans; velocity values are at operating speed | mm/s RMS | 2.5 | 4.5 | 7.1 | Balance quality G2.5: <=2.5 mm/s; G6.3: <=6.3 mm/s; residual unbalance limits |
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