IE A103REPORT UNDER CONTRACT No. 87/2000-PD · DIKANEVSKY TREATMENT COMPLEX
NG-750-23 air blower: metal back on the gear teeth, less energy consumed
Gearbox teeth built up metal, rotor axial play decreased, the unit began consuming less energy. 0.13–0.47 mm — tooth thickness gain on wheel and pinion, meshing zone, 400 h; 8.2 % — electricity use by the unit, 217 560 → 199 680 kWh over 216 h; 0.04 mm — axial displacement of the blower rotor, 0.25 → 0.21 mm (2000).
unit No. 3STD-1250 electric motor · R-1000/1.43 gearbox · blower bearing assemblies
of friction unitsapproved by the plant's chief engineer, stamped
Key results
| UNIT | CONDITION BEFORE TREATMENT | WHAT WAS MEASURED |
|---|---|---|
| R-1000/1.43 gearbox, gear wheel — pinion pair | Tooth wear 15–25 %; 15–20 % of the active profile with pitting and deep scoring near the pitch point | Tooth thickness at four points on the wheel and on the pinion, active profile, noise |
| Blower bearing assemblies | Scraping marks and lapping patches on the shaft — bearing shell contact | Axial displacement of the rotor, main oil pump pressure |
| Unit No. 3 as a whole | Actual running time 6100 h per year | Electricity consumed, read from the plant's standard meter |
R-1000/1.43 gearbox — tooth geometry and condition after 400 hours of operation
| PARAMETER | MEASURED RESULT |
|---|---|
| Wheel — tooth thickness gain | 0.16–0.32 mm in the meshing field zone |
| Pinion — tooth thickness gain | 0.13–0.47 mm in the meshing field zone |
| Active tooth profile | 72 % → 78 % of tooth height |
| Working surface of the teeth | Appearance of a smooth ground surface: pitting and scoring — stress concentrators — have disappeared |
| Gearbox noise in operation | 5 dB below the initial level |
Tooth thickness — ShchZN-18 gear tooth vernier caliper, TU 2-034-773-89: four control points on the wheel and four on the pinion, before treatment and after 400 hours of operation.
Blower bearing assemblies and lubrication system
| PARAMETER | MEASURED RESULT |
|---|---|
| Axial displacement of the rotor | 0.25 mm → 0.21 mm |
| Main oil pump pressure | increased by 5 % |
| Bearing shell surface | Greyish colour — the metal-ceramic layer starting to form |
Measurements and inspection of the bearing shells were performed during the control inspection of the bearing assemblies after 400 hours of operation.
Electricity use by unit No. 3 — 216 hours of operation before and after treatment
| PERIOD | ELECTRICITY CONSUMED |
|---|---|
| 05.07 – 14.07.2000, before treatment, 216 h | 217 560 kWh |
| 14.08 – 23.08.2000, after treatment, 216 h | 199 680 kWh |
| Difference over an identical period | 17 880 kWh — 8.2 % |
| Per year at the actual running time of 6100 h — as calculated in the report | 504 944 kWh |
Readings of the unit's standard electricity meter were taken twice a day; the tables are signed by the plant's chief mechanical engineer and chief power engineer.
Conclusions of the plant commission
Current equivalent
- Revitalizant gel for gearboxesGearboxes · transmissions · gear drives
- Revitalizant gel for compressors and bearingsCompressors · bearings · spindles
How such units are treated:
About this result:
Limits of this report: The results relate to the NG-750-23 air blower with an R-1000/1.43 gearbox and an STD-1250 electric motor on unit No. 3 of the Dikanevsky treatment complex; with other machines and operating modes the figures may differ. The restorative repair was performed by XADO LLC specialists together with the plant's personnel; the measurements were taken and signed by the services of the Dikanevsky treatment complex.