PUMP泵系统介绍课件.pptVIP

AN INTRODUCTION TO PUMPING EQUIPMENT ;WHAT IS THE PUMP?;There are two main categories of pump: ;Centrifugal Pumps: ;The main difference between kinetic and positive displacement pumps lies in the method of fluid transfer.?;Parameter;1- Casing:-; Radial flow; Once again, imagine starting a pump and raising the fluid in a vertical tube to the point of maximum elevation. On the curve this would be maximum head at zero flow. Now, rotate the running pump on its centerline 90°, until the vertical tube is now in a horizontal position.;Family curves;Heads of Pump:;Manometric head (Hm) :;There are three main categories of impeller due type of impeller’s vane, which are used in the centrifugal pumps as; Radial vanes, Fig. (a). Backward vanes, Fig. (b). Forward vanes, Fig. (c). ;a) when β2 90o, the Forwards curved vanes of the impeller. ;Pump Efficiencies ;4- Mechanical Efficiency (ζ) It is due to losses in the shaft, coupling, and other operation losses as vibration ;6- Power Required to Drive a Centrifugal Pump;8- The Affinity Law