Last month's column addressed items 35 to 68. Here we present items 69 to 102. F. Mechanical improvement options continued 69. In lieu of item 68, strongly consider using Vespel CR6100 carbon fil..
Last month's column addressed items 35 to 68. Here we present items 69 to 102.
F. Mechanical improvement options continued
69. In lieu of item 68, strongly consider using Vespel CR6100 carbon filament high-performance polymer for wear rings, throat bushings, column bushings, etc.
70. Examine need for occasional measures to cure plate-mode or impeller cover vibration. Consider ?scalloping,? if necessary to avoid impeller vibration other than unbalance-related vibratory action.
71. Consider providing generous fillet radii (0.2 in. or 5 mm, minimum) at shaft shoulders in contact with overhung impellers to avert reverse bending fatigue failures.
72. Veri
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