By Val S. Lobanoff, Robert R. Ross
Useful reference stressing hydraulic layout, functionality prediction, research, and assessment. New up-to-date variation is a useful reference instrument for engineers, designers, and scholars and a realistic, hands-on advisor for pump clients. DLC: Centrifugal pumps.
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Extra info for Centrifugal Pumps: Design And Application
Many old pump lines have poorly planned range charts, resulting in similar pump overlaps and uncovered gaps between pump sizes. Such a General Pump Design 4? Figure 4-1. Poorly planned performance chart. chart is shown in Figure 4-1. Black dots show pumps that could be eliminated, permitting a substantial reduction in inventory without hurting overall hydraulic performance. This type of chart is not recommended. A suggested properly layed out performance range chart is shown in Figure 4-2. Steps to develop this chart are now described.
Overhung or two-bearings design. • Close-coupled or coupled units. « Stiff shaft or flexible shaft design. • Single volute, double volute, quad volute. • Short elbow-type or turbine-type diffusers. • Mechanical seals or packing. « Stuffing boxes with bleed-offs or with clean flush injection. • Ball, sleeve, or Kingsbury-type bearings. • Oil rings, forced feed, oil mist, submerged or grease packed lubrication,, It can be seen from the variables listed that it is a complex job for a pump designer to design the right pump for the right environment.
Step 7: Estimate impeller eye area. 66 sq in. Impeller Design 33 Step 8: Estimate NPSHR. From Figure 3-6: Step 9: Determine volute parameters, To finalize the impeller design, we must consider any mechanical limitations of the pump casing. Designing the impeller alone is not sufficient as we must see how it physically relates to the volute area, cutwater diameter, volute width, etc, • Volute area. Figure 3-7 shows a number of curves for volute velocity constant K3. These represent the statistical gathering efforts of a number of major pump companies.