Oil-lubricated plain bearings
The procedure describes the treatment of bearing assemblies with plain bearings lubricated with oil using XADO revitalizant gel for compressors and bearings (industrial). The purpose is to restore and protect friction surfaces without stopping or disassembling the assembly.
Units covered by the method
10Method
What is treated
- Bearings with a wear degree of less than 80%, free of defects and mechanical damage.
- Plain bearings lubricated with oil.
- New bearing assemblies or assemblies with wear up to 10% — treated by the same procedure, but in 4 stages.
When treatment is not performed
- Bearings with a wear degree of 80% or more are not subject to treatment.
- Bearings having defects and mechanical damage are not subject to treatment.
Preparation
- Eliminate oil leaks before treatment.
- Before starting the treatment, take measurements of the main operating parameters (see the measurements section).
What is measured before and after
| Parameter | Instrument | How and when |
|---|---|---|
| Bearing radial clearance (radial play) value | Set of feeler gauges | Measured before the start of treatment and after completion of the full treatment cycle. |
| Radial runout value of the bearing assembly shaft | Indicator stand with a measuring dial indicator with a graduation value no coarser than 0.01 mm | By rotating the unloaded shaft with the indicator tip placed on its radial surface and reading the indicator; before the start and after completion of the treatment. |
| Vibration level of the bearing or bearing assembly: vibration acceleration, vibration velocity, vibration displacement | Vibrometers of various types | At fixed points of the bearing assembly housing in the vertical, horizontal and axial directions of each bearing support. |
| Operating oil temperature | Liquid thermometer or non-contact pyrometer | Measured after a fixed operating time of the bearing assembly under a specified load at the same ambient temperature. |
| Current consumption or power consumption of the electric motor (for bearing assemblies of electrically driven units) | Electric meters, clamp meters, wattmeter or a multimeter for determining electrical parameters | In idle mode or at a fixed load. |
What the reports on these components showed
- Increased electric power consumption32 cases · median 8 %, 53 values
- Loss of compression4 cases · median 18 %, 4 values
- Elevated vibration32 cases · median 45 %, 24 values
- Increased fuel consumption2 cases · median 12 %, 3 values
- Increased clearances and backlash27 cases · median 24 %, 21 values
- Elevated operating temperature9 cases
- Oil pressure drop6 cases
Consolidated register of the evidence base →
Dosage rates
| Compound | Rate | How and when |
|---|---|---|
| XADO revitalizant gel for compressors and bearings (industrial) | 1.5 ml per 1 litre of the standard oil | Per 1 treatment stage. |
| Standard oil for pre-dissolving the gel | 1 part of the gel being dissolved to 5–10 parts of oil heated to a temperature of 50–60 °C | Prepared in a separate vessel before being introduced into the oil bath. |
Treatment stages
- In a separate vessel, take a small amount of the standard oil (at a ratio of 1 part of the gel being dissolved to 5–10 parts of oil) heated to 50–60 °C, add the calculated amount of XADO revitalizant gel for compressors and bearings (industrial) at a rate of 1.5 ml per 1 litre of the standard oil, and mix the components thoroughly. Introduce the resulting mixture into the oil bath of the bearing assembly, start the mechanism and operate it in the standard mode.The interval until the next stage is not less than 8–12 hours of total bearing operating time.
- Carried out in the same way as the first stage.The interval is not less than 8–12 hours of total bearing operating time.
- Carried out in the same way as the first stage.The interval is not less than 8–12 hours of total bearing operating time.
- Carried out in the same way as the first stage.The interval is not less than 8–12 hours of total bearing operating time.
- Carried out in the same way as the first stage.The interval is not less than 8–12 hours of total bearing operating time.
- Carried out in the same way as the first stage.The interval is not less than 8–12 hours of total bearing operating time.
After treatment
- The treatment is considered complete after 550 hours of total bearing operating time from the beginning of the first stage.
- After completion of the full treatment cycle, the main operating parameters are measured again: radial clearance (play), shaft radial runout, vibration level, operating oil temperature, current or power consumption of the electric motor.
Points to watch
- Only bearings with a wear degree of less than 80%, free of defects and mechanical damage, are subject to treatment.
- Oil leaks must be eliminated before treatment.
- For plain bearings lubricated with oil, it is specifically “XADO revitalizant gel for compressors and bearings (industrial)” that is used.
Compounds for these units
- Revitalizant gel for compressors and bearingsPiston, screw and centrifugal compressors; rolling and sliding bearings running in an oil bath; machine-tool spindle units and slideways.
Reports on this unit
- Zaporozhstal OJSC · 2013↑ 0.05-0.15mm — gearbox tooth thickness, 5.8 → 5.9 and 6.0 → 6.15 mm
- Perm Motor Plant · 2012↓ 4× — spindle bearing runout at the end of the work shift, 0.06 → 0.015 mm
- ArcelorMittal Kryvyi Rih · 2011↓ 2.8–3.1% — power drawn by the drive under load, 2578–2692 → 2506–2609 kW
- Kharkiv Yeast Plant JSC · 2009↓ 12–18% — vibration level at the rotor bearing assemblies and the base supports
- UKROLIIA LLC · 2007↑ 0.2-0.5mm — tooth thickness of stage I and II gear drives, 4.0–6.9 → 4.3–7.2 mm
- TETs-3 CJSC, Kharkiv · 2006↓ 8.6–12.5% — motor current, 20 → 17.5 A and 155–160 → 141.6–144 A
Source: Instructions for the use of XADO revitalizant gels IE-24.6-25612000-005-2008, pages 18–19.