TWO ACTS OF THE BOILER-TURBINE SHOP · TREATMENT SEPTEMBER 2005 – JANUARY 2006
Exhauster D5B and fan VGD 5B: bearing vibration and current down without dismantling
with signatures and seal
What repeated on both machines
| UNIT | DRIVE | OPERATING TIME AFTER TREATMENT | WHAT WAS MEASURED |
|---|---|---|---|
| Smoke exhauster D5B, boiler-turbine shop | 320 kW, 710 rpm | 585 h | Vibration at 16 points, motor current, power consumption |
| Hot-blast fan VGD 5B, boiler-turbine shop | 200 kW, 985 rpm | 548 h | Vibration at 16 points, motor current across three phases |
Power consumption of the drives
| UNIT | PARAMETER | BEFORE | AFTER | CHANGE |
|---|---|---|---|---|
| Exhauster D5B | Motor current, A | 20.0 | 17.5 | −12.5 % |
| Exhauster D5B | Power consumption, kW | 234.5 | 206.7 | −11.8 % |
| Fan VGD 5B | Motor current, phase A, A | 155.0 | 141.6 | −8.6 % |
| Fan VGD 5B | Motor current, phase B, A | 160.0 | 143.2 | −10.5 % |
| Fan VGD 5B | Motor current, phase C, A | 160.0 | 144.0 | −10.0 % |
The exhauster power was read from the electricity metering device; the fan current with clamp meters across three phases. For the fan the act states a reduction of power consumption by 9.3 %.
Vibration velocity of the bearing supports, both machines
| MEASUREMENT POINT | EXHAUSTER D5B, mm/s | FAN VGD 5B, mm/s |
|---|---|---|
| Motor rear support, vertical | 2.41 → 0.992 | 1.97 → 1.04 |
| Motor rear support, horizontal | 2.44 → 1.79 | 2.72 → 1.67 |
| Motor rear support, axial | 3.39 → 1.97 | 2.85 → 2.26 |
| Motor front support, vertical | 5.78 → 1.11 | 2.09 → 2.26 |
| Motor front support, horizontal | 7.66 → 2.65 | 2.24 → 1.68 |
| Motor front support, axial | 3.56 → 1.88 | 2.69 → 2.51 |
| Main shaft bearing, vertical | 2.7 → 2.06 | 1.01 → 0.78 |
| Main shaft bearing, horizontal | 3.98 → 2.73 | 1.50 → 1.32 |
| Main shaft bearing, axial | 3.45 → 2.31 | 2.23 → 1.56 |
| Tail shaft bearing, vertical | 1.58 → 0.85 | 1.99 → 1.43 |
| Tail shaft bearing, horizontal | 1.44 → 1.35 | 1.91 → 1.03 |
| Tail shaft bearing, axial | 2.15 → 1.68 | 3.80 → 1.89 |
Vibrometer “SENDIG 911”, 16 control points on each machine; the table shows the bearing supports. The range in the case header is taken from here.
Supports with the highest vibration before treatment
| UNIT | POINT AND VALUE | BEFORE | AFTER |
|---|---|---|---|
| Exhauster D5B | Motor front support, vibration displacement (horizontal) | 209.0 µm | 68.3 µm |
| Exhauster D5B | Motor front support, vibration displacement (vertical) | 163.0 µm | 36.6 µm |
| Exhauster D5B | Main shaft bearing, vibration acceleration (horizontal) | 28.5 m/s² | 18.4 m/s² |
| Fan VGD 5B | Motor front support, vibration acceleration (axial) | 29.8 m/s² | 11.9 m/s² |
| Fan VGD 5B | Motor rear support, vibration acceleration (vertical) | 14.1 m/s² | 4.94 m/s² |
| Fan VGD 5B | Tail shaft bearing, vibration displacement (axial) | 35.6 µm | 16.3 µm |
The same instruments and the same points as in the vibration velocity table: shown are the supports that were loaded the most before treatment.
Conclusions of the acts
The results relate to the bearing assemblies of the draught machines of the boiler-turbine shop — the D5B smoke exhauster with a 320 kW drive and the VGD 5B hot-blast fan with a 200 kW drive; on other units and in other modes the figures may differ. The originals of both acts with the signatures and seal of TETs-3 CJSC are published in full and available for download.
Current equivalent
Revitalizant gel for compressors and bearings →
Piston, screw and centrifugal compressors; rolling and sliding bearings running in an oil bath; machine-tool spindle units and slideways.
How such units are treated: