Vibration Severity: ISO_20816_2_LANDSTEAM
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 | power kw min (kW) | 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_20816_2_LANDSTEAM | ZONE_LIMITS_FLEXIBLE | ISO 20816-2 land-based steam turbines >50 MW - flexible foundation | ISO_20816_2_SteamTurbine | flexible | Flexible (spring-supported) foundation allows higher limits; typical for combined-cycle plants with spring-isolated foundations | 50,000 | mm/s RMS | 4.5 | 7.1 | 11.2 | Zone A/B/C/D limits for steam turbines on flexible/spring foundations |
| ISO_20816_2_LANDSTEAM | ZONE_LIMITS_RIGID | ISO 20816-2 land-based steam turbines >50 MW - rigid foundation | ISO_20816_2_SteamTurbine | rigid | ISO 20816-2:2001; covers 2-pole and 4-pole steam turbines >50 MW for power generation; bearing housing velocity | 50,000 | mm/s RMS | 2.3 | 4.5 | 7.1 | Zone A/B/C/D limits for large land-based steam turbines on rigid foundations |
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