1. Must directly compare to a Diffusion Pump applied to this furnace and gun location to make a conclusion. 2. There may be other turbo pump designs that would decrease the bearing failure rates. 3. Turbo Pumping the Upper EB Gun Chamber Excellent pumping performance; Bearing failures resulted in questionable reliability in some gun locations. (over the melt zone); High Maintenance costs. Not user Serviceable; Eliminated the possibility of oil back-streaming into the upper gun chamber.
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