Fracttal One allows vibration readings to be analyzed not only by their overall value (overall severity), but also by frequency band, making it possible to identify the type of fault causing the vibration in a piece of equipment.
Severity values in mm/s RMS according to the type of equipment and the frequency band associated with the fault:
Electric Motor
Band / Fault | Normal (mm/s) | Warning (mm/s) | Alarm (mm/s) | Critical (mm/s) | Interpretation |
|---|---|---|---|---|---|
1X | < 1.8 | 1.8 – 4.5 | 4.5 – 7.1 | > 7.1 | Unbalance |
2X | < 1.0 | 1.0 – 2.5 | 2.5 – 4.0 | > 4.0 | Misalignment |
3X | < 0.7 | 0.7 – 1.5 | 1.5 – 3.0 | > 3.0 | Bending / eccentricity |
Centrifugal Pump
Band / Fault | Normal (mm/s) | Warning (mm/s) | Alarm (mm/s) | Critical (mm/s) | Interpretation |
|---|---|---|---|---|---|
1X | < 1.8 | 1.8 – 4.5 | 4.5 – 7.1 | > 7.1 | Impeller unbalance |
2X | < 1.0 | 1.0 – 2.5 | 2.5 – 4.0 | > 4.0 | Pump–motor misalignment |
Fan (axial or centrifugal)
Band / Fault | Normal (mm/s) | Warning (mm/s) | Alarm (mm/s) | Critical (mm/s) | Interpretation |
|---|---|---|---|---|---|
1X | < 1.8 | 1.8 – 4.5 | 4.5 – 7.1 | > 7.1 | Unbalance (dust, wear) |
2X | < 1.0 | 1.0 – 2.5 | 2.5 – 4.0 | > 4.0 | Train misalignment |
Gearbox / Gear Case
Band / Fault | Normal (mm/s) | Warning (mm/s) | Alarm (mm/s) | Critical (mm/s) | Interpretation |
|---|---|---|---|---|---|
1X gear | < 1.8 | 1.8 – 4.5 | 4.5 – 7.1 | > 7.1 | Shaft misalignment |
Belt Systems
| Band / Fault | Normal (mm/s) | Warning (mm/s) | Alarm (mm/s) | Critical (mm/s) | Interpretation |
|---|---|---|---|---|---|
1X | < 1.8 | 1.8 – 4.5 | 4.5 – 7.1 | > 7.1 | Unbalance |
2X | < 1.0 | 1.0 – 2.5 | 2.5 – 4.0 | > 4.0 | Pulley misalignment |
Reciprocating Compressor
Band / Fault | Normal (mm/s) | Warning (mm/s) | Alarm (mm/s) | Critical (mm/s) | Interpretation |
|---|---|---|---|---|---|
1X | < 2.0 | 2.0 – 4.0 | 4.0 – 6.0 | > 6.0 | Unbalance / mechanical problems |
2X – 5X | < 1.0 | 1.0 – 2.0 | 2.0 – 3.0 | > 3.0 | Piston impacts |
Centrifugal Compressor
Band / Fault | Normal (mm/s) | Warning (mm/s) | Alarm (mm/s) | Critical (mm/s) | Interpretation |
|---|---|---|---|---|---|
1X | < 2.0 | 2.0 – 4.0 | 4.0 – 6.0 | > 6.0 | Unbalanced rotor |
Turbine (steam, gas, hydraulic)
Band / Fault | Normal (mm/s) | Warning (mm/s) | Alarm (mm/s) | Critical (mm/s) | Interpretation |
|---|---|---|---|---|---|
1X | < 2.0 | 2.0 – 3.2 | 3.2 – 4.5 | > 4.5 | Unbalance |
2X | < 1.0 | 1.0 – 2.0 | 2.0 – 3.0 | > 3.0 | Bending / alignment problems |