00:09 This session will cover the concept of npsh - a crucial and challenging aspect of pumping. 02:46 Understanding of NPSH and its impact on us 08:32 Understanding NPSH is fundamental to pump operation. 11:28 NPSH and Nss explained simply 17:39 NPSH is often misunderstood, cavitation occurs at higher suction pressures. 20:35 Maintain sensible margin to avoid raising suction pressures too high 26:21 The correction factor for pumping different fluids affects NPSHr. 29:01 Understanding the difference between NPSH and recirculation in pumps. 34:28 Impeller designs from 1950s-1980s had limitations that led to increased vibration and unstable NPSHr characteristics. 37:15 Pumps should operate at their design point for best efficiency 42:26 Incorrect assumptions can lead to equipment oversizing and poor performance. 44:52 NPSh ratio and NPSh margin are important factors in pump performance. 49:48 High density causes damaging cavitation with an SG of 1.2. 52:29 NPSH is crucial for pump operation. 57:31 Calculate NPSH available and compare with pumps in the marketplace. 1:00:06 Consider inducers for improving NPSH margin 1:05:15 Designing systems to avoid cavitation and achieve best efficiency. 1:07:43 NPSH affects impeller trimming and pump speed. 1:12:49 NPSH is based on actual liquid level or pressure above in a closed system. 1:15:20 NPSH and cavitation considerations for pump operation 1:20:28 NPSH testing and operational considerations 1:23:12 Lowering the impeller in VS6 pumps can increase NPSH available Crafted by Merlin AI.
