Page 7 - Centrifugal Pumps Design and Application

4 General Pump Design 45

Performance Chart.

5 Volute Design ................................................ SO
Types of Volute Designs. Single-Volute Casing Designs. Double-Volute Casing De-
signs. Double-Volute Dividing Rib (Splitter). Triple-Volute Casings. Quad-Volute Cas-
ings, Circular-Volute Casings. General Design Considerations. The Use of Universal
Volute Sections for Standard Volute Designs. The Design of Rectangular Double Vo-
lutes. The Design of Circular Volutes. General Considerations in Casing Design. Man-
ufacturing Considerations. Casing Surface Finish. Casing Shrinkage. Conclusion, No-
tation. Reference,

6 Design of Multi-Stage Casing — 6S
General Considerations in Crossover Design. Specific Crossover Designs. Crossovers
with Radial Diffusing Sections. Crossovers with Diagonal Diffusing Sections. Mechan-
ical Suggestions. Notation.

7 Double-Suction Pumps and Side-Suction Design . 77

Double-Suction Pump Design. Pump Casing. Double-Suction Impeller. Side Suction
and Suction Nozzle Layout. Suction Layout (End View). Suction Layout (Profile),

8 NPSH ,, 15
Establishing NPSHA. Predicting NPSHR. Moderate Speed Pumps. Influence of Suc-
tion Specific Speed (Nss). High Speed Pumps. Cavitation-Free NPSHR. Influence of
Suction Nozzle. Influence of Liquid. Suction Piping. Effect of Viscosity. Notation. Ref-
erences.

Part2: Applications 111
9 Vertical Pumps 113
by Erik B, Fiske
Configurations. Well Pumps. Wet Pit Pumps. Barrel-Mounted or Can-Mounted
Pumps. Applications. Well Pumps. Water Well Pumps. Incline-Mounted Pumps. Cav-

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