Vibration Severity: ISO_10816_3_GRP1_RIGID
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_10816_3_GRP1_RIGID | A_B_BOUNDARY | Group 1 large rigid foundation - Zone A/B boundary | Group_1_Large | rigid | Group 1: rated power >300 kW or electrical machines shaft height H>=315 mm; rigid foundation (rigidly mounted on stiff foundation); ISO 10816-3:2009 Table 1 | 300 | mm/s RMS | 2.3 | 2.3 | 2.3 | Zone A: newly commissioned; Zone B: acceptable long-term; Zone C: plan corrective maintenance; Zone D: damage risk |
| ISO_10816_3_GRP1_RIGID | B_C_BOUNDARY | Group 1 large rigid foundation - Zone B/C boundary | Group_1_Large | rigid | Group 1 rigid; Alert threshold at 4.5 mm/s | 300 | mm/s RMS | 2.3 | 4.5 | 4.5 | Zone A: newly commissioned; Zone B: acceptable long-term; Zone C: plan corrective maintenance; Zone D: damage risk |
| ISO_10816_3_GRP1_RIGID | C_D_BOUNDARY | Group 1 large rigid foundation - Zone C/D boundary | Group_1_Large | rigid | Group 1 rigid; Shutdown/trip threshold at 7.1 mm/s | 300 | mm/s RMS | 2.3 | 4.5 | 7.1 | Zone A: newly commissioned; Zone B: acceptable long-term; Zone C: plan corrective maintenance; Zone D: damage risk |
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