The business of consulting has involved me with much of the activity that surrounds a turbine deck during maintence periods. The pickle (rotor) will usually only be removed when recorded vibration has neared certain limits. Bearings, seals and such can be serviced without removing the pickle.
When a full disassembly is required, plus the servicing, and then reassembly, it is absolutely captivating for those who love mechanisms. Huge cranes, tremendous rigging, frightfully heavy components, and large burly men (petite women sometimes too) who manage to work as if repairing a Swiss watch.
Many pairs of eyes watch all aspects of the reassembly. Truly precise measurements are taken. Vast documentation occurs. The “what ifs” and “how abouts” require charts and tables and calculations to resolve. Items are x rayed. New, and verified hardware replaces some of the old. Asses, customers, and the NRC are covered and satisfied seven ways from Sunday. After final button-up, tests are performed.
But “stuff” happens.
Electronic “sniffers” can catch gas leaks in time, almost every time.
Sometimes, fault cannot be placed on human shoulders. The sequence of events that lead to mechanical failure are not always found in their entirety.
Looking forward to Anthracite’s findings.