Solution & Implementation
The operator First Hydro approached Furmanite to find an in-situ solution. Based on its previous experience with similar types of repair, Furmanite developed its circular self levelling milling technology to re-machine the top cover journal faces, and fit stainless steel liners as a counter face for the self lubricating bearing.
To guide the milling machine, which rotates around the main drive shaft, a special split bearing sleeve on the shaft was designed. This was set concentric to the top cover outside diameter using a clocking arm. The flatness of the top cover horizontal bearing was maintained by the machine’s novel self-levelling technology, which controls the milling cutter height via an electro-hydraulic interface from the pre-set datum ring. A special split datum ring was manufactured for the purpose, to go around the drive shaft and mount on the top cover. The datum ring flatness was set using Furmanite’s precision scanning laser system, for maximum accuracy