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Extra resources for Certification of Geometric Dimensioning and Tolerancing Professionals: Asme Y14.5.2 - 2000 (Asme Standard)
Neither radial nor axial. The blades have double curvature design. Flow through the impeller is neither radial nor axial, but is in mixed or diagonal direction. These pumps are called mixed flow pumps or diagonal flow pumps. Low head-high discharge pumps have high specific speed. Inlet and outlet edges of impeller blade are almost perpendicular to the flow direction. The blades are of double curvature design. These pumps are called axial flow pumps. Very low head and very high discharge condition gives very high specific speed.
Very low head and very high discharge condition gives very high specific speed. The fluid flow direction in impeller is axial. Ship propellers belong to this category. In general, pumps are classified as radial, mixed, diagonal or axial, depending upon the fluid flow through the impeller passage. All positive displacement pumps have very low discharge and very high head and hence very low specific speed. , from zero discharge to zero head as well as change in speed. Practically very low speed and very high speeds could not be attained, so also very low head and very high discharge are limited and hence the specific speed.
Radial seal ring 20. Gland 21. Stuffing box ring 22. Bottom ring 23. Block ring 24. Stuffing box 25. Splash ring 4 26. Wearing ring 27. Shaft sleeve 28. Disk 29. Pin 30. Oil level regular 31. Hexagon screw 32. Hexagon screw 33. Stud bolt 34. Stud bolt 35. Stud bolt 36. Stud bolt 37. Locking screw 38. Threaded pin 39. Inner hexagon screw 40. Nut 41. Nut 42. Impeller nut 43. Fitting key 44. Fitting key Fig. 6. Back pullout-double bearing type pump with combine volute casing 14 ROTODYNAMIC PUMPS (CENTRIFUGAL AND AXIAL) 6 1 7 2 8 3 5 10 4 9 Fig.
Certification of Geometric Dimensioning and Tolerancing Professionals: Asme Y14.5.2 - 2000 (Asme Standard) by Asme Press