At a major refinery, vertical molten sulfur pumps were fitted with nickel-chromium (Ni-Cr) bearings to handle the high-temperature environment. To avoid seizing and galling, the line shaft and volute bearings were fit with 0.020 – 0.025” running clearance. However, the pumps were experiencing high vibration, approaching 1.0 inches/second peak. When they disassembled the pump, the bearing clearances had opened up to 0.030 – 0.034”.
The customer contacted one of our engineers and asked:
"How well do the
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