When it comes to pumping systems that have varying demands, many engineers are hesitant to size the pump to less than the highest possible load. While this is certainly conservative from a flow standpoint, the downside is that additional costs are incurred to mitigate what might be a small risk.
Proper lubrication is a key to long, trouble-free life of centrifugal pump bearings. In recent years, the issue of lubrication has received renewed attention from pump users in chemical plants, pulp and paper mills, refineries and other industries.
Mistakes with respect to NPSH calculations and available (NPSHa) calculations are all too frequent and expensive to correct. This 5 part series from Jim Elsey will teach you what you need to know for npsh calculation.