TECHNICAL REPORT|METALLURGY · COKE CHEMISTRY|GEARBOX · SCREW-NUT PAIR
GREASE TEST REPORT · COKE-CHEMICAL PLANT, OJSC SEVERSTAL
Coke pusher No. 2: screw-nut pair outlasts the standard interval, no top-ups
PRODUCTXADO Repair Greasesingle 2 kg charge into the gearbox housing
TEST OBJECTWorm-screw gearbox of the door-removal drivescrew-nut pair · coke pusher No. 2, shop of coke batteries 5-6
DOCUMENT TYPEReport of the coke-chemical plant,
OJSC Severstalsigned and stamped · four plant signatories
OJSC Severstalsigned and stamped · four plant signatories
Key results
↑1.5×
nut service life: 3–4 months on the standard grease → 5 months 26 days with no replacement, no failure occurred
↓6.3×
grease consumption over 177 days: 12.6 kg of weekly top-ups (calculated at 0.5 kg per week) → 2 kg charged once
| EQUIPMENT | MODE BEFORE THE TEST | WHAT WAS OBSERVED |
|---|---|---|
| Coke pusher No. 2, worm-screw gearbox of the door-removal drive | IP-1 grease: 0.5 kg topped up weekly, nut replaced every 3-4 months | Nut service life, condition of the screw-nut pair, grease consumption |
Screw-nut pair of the door-removal gearbox — standard mode and XADO Repair Grease
| PARAMETER | IP-1 GREASE, STANDARD MODE | XADO REPAIR GREASE |
|---|---|---|
| Nut service life | replacement every 3-4 months | 5 months 26 days with no replacement, unit still running |
| Grease replenishment | 0.5 kg topped up weekly | 2 kg charged once, no top-ups |
| Condition of the screw-nut pair | nut life used up within 3-4 months | good — per inspection by plant specialists |
Observation in the live unit of coke pusher No. 2 from 5 Oct 2004; as of the report date the screw-nut pair was still in operation.
Costs per plant records
| COST ITEM | IP-1 GREASE, STANDARD MODE | XADO REPAIR GREASE |
|---|---|---|
| Grease over the observation period | 232.5 RUB including weekly top-ups | 4112 RUB — single 2 kg charge |
| Nut of the screw-nut pair | 10 800 RUB every 3-4 months | no replacements |
2005 prices per the internal cost records of the coke-chemical plant; the report gives no final savings calculation.
Conclusion of the plant commission
The commission of the coke-chemical plant of OJSC Severstal recorded in the report: the screw-nut pair of the worm-screw gearbox of the door-removal drive of coke pusher No. 2 has been running on XADO Repair Grease from 5 October 2004 to the report date — 5 months 26 days — and the condition of the pair is good. On the standard IP-1 grease, a nut costing 10 800 RUB was replaced every 3-4 months, and the grease itself was topped up by 0.5 kg every week; XADO Repair Grease was charged into the gearbox housing once, in the amount of 2 kg, and was never added again. As of the signing date the test was continuing and the unit remained in service. Conclusion of the commission: “Given the above, it is desirable to extend the use of XADO greases to various equipment of the coke-chemical plant.”
The results apply to the screw-nut pair of the worm-screw gearbox of the door-removal drive of a coke battery pusher; with a different unit, load or lubrication mode the figures may differ. The original report of the coke-chemical plant of OJSC Severstal dated 31 Mar 2005, with signatures and stamp, is published in full and available for download.
Current equivalent
- Revitalizant gel for gearboxesGearboxes · transmissions · gear drives
- XADO “Restorative” greaseFriction pairs · joints
How such units are treated: