Curing Micropitting in hoist gear of 30T shipping crane
CHALLENGE
A large steel plant in the Southeast USA found excessive micropitting in the hoist gears of the shipping crane, a 30 T crane with 3 stage reduction set. The plant had already purchased the replacement gear set, but decided to keep the one in use as long as possible to avoid downtime.
OUTCOME
Rewitec was installed end of January 2007. The surface treatment cured micropitting in a few weeks. The surface appeared much smoother and bright.
One year later, there has been no sign of deterioration the old gears are still working and the new gear set awaits its turn. Maintenance Manager commented: "The fact that the gearbox could operate for one full year longer is 10 times more significant to me that any amperage reduction."
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RESULTS
The Shipping Department purchased one full year of continued operation of that gear set for $1,500 ($4.11 / day.) They saved the new set, worth over $30,000.
The plant decided to install Rewitec coating in 2 other gearboxes with a historicaly short life:
- Caster Withdrawal Drive Gearbox, Straightener Segment #6 Top Entry
- Caster Withdrawal Drive Gearbox, Straightener Segment #6 Bottom Entry