Centrifugal Pumps Design and Application 2nd ed - Val S. Lobanoff, Robert R. Ross (Butterworth-Heinemann, 1992)
Specific Speed and Modeling Laws 27 Pumps selected as models must have reliable hydraulic performance based on accurate instrumentation. Unreliable model tests used as a basis for new development will lead to total disaster. It is strongly suggested that the selected model pump be retested to verify its hydraulic performance. In the following chapters of this book "specific speed" will be referred to with many additional charts, curves, and technical plots.
3 Impeller Design In this chapter detailed information for designing a centrifugal pump impeller will be presented. This information will apply to a new design where a model in the same specific speed is not available. The design factors shown are based on a theoretical approach and many years of collecting thousands of performance tests in various specific speeds. The following example, will demonstrate the procedure necessary to design and layout a new impeller. Example The requirements for a new pump are shown on curve Figure 3-1, which at Best Efficiency Point (BEP) is: 2,100 GPM—450 ft-3,600 RPM-Liquid—Water Step 1: Calculate pump specific speed.
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- Page 16 and 17: Part 1 Elements of Pump Design
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- Page 20 and 21: Introduction 5 Figure 1-2. The syst
- Page 22 and 23: Introduction 7 mate responsibility
- Page 24 and 25: Introduction 9 Figure 1-6. Maximum
- Page 26 and 27: 2 Specific Speed and Modeling Laws
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- Page 38 and 39: Figyre 2-7, New pump from model pum
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- Page 44 and 45: Impeller Design 29 Figure 3-1. Requ
- Page 46 and 47: Impeller Design 31 Figure 3-4. Capa
- Page 48 and 49: Impeller Design 33 Step 8: Estimate
- Page 50 and 51: Impeller Design 35 Figure 3-7. Volu
- Page 52 and 53: impeller Design 37 (2) 5 , as final
- Page 54 and 55: Impeller Design 39 The vane develop
- Page 56 and 57: Impeller Design 41 Figure 3-12. Are
- Page 58 and 59: impeller Design 43 Figure 3-16. Inf
- Page 60 and 61: 4 General Pump Design It is not a d
- Page 62 and 63: General Pump Design 4? Figure 4-1.
- Page 64 and 65: General Pump Design 49 designed and
- Page 66 and 67: Volute Design 51 Figure 5-1. Volute
- Page 68 and 69: Volute Design 53 Figure 5-2. Radial
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- Page 74 and 75: Volute Design 59 Figure 5-5. Typica
- Page 76 and 77: Volute Design 61 Figure 5-8. Univer
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- Page 80 and 81: 6 Design of Multi-Stage Casing Mult
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3<br />
Impeller<br />
<strong>Design</strong><br />
In this chapter detail<strong>ed</strong> information for designing a centrifugal pump<br />
impeller will be present<strong>ed</strong>. This information will apply to a new design<br />
where a model in the same specific spe<strong>ed</strong> is not available. The design<br />
factors shown are bas<strong>ed</strong> on a theoretical approach <strong>and</strong> many years of collecting<br />
thous<strong>and</strong>s of performance tests in various specific spe<strong>ed</strong>s.<br />
The following example, will demonstrate the proc<strong>ed</strong>ure necessary to<br />
design <strong>and</strong> layout a new impeller.<br />
Example<br />
The requirements for a new pump are shown on curve Figure 3-1,<br />
which at Best Efficiency Point (BEP) is:<br />
2,100 GPM—450 ft-3,600 RPM-Liquid—Water<br />
Step 1: Calculate pump specific spe<strong>ed</strong>.
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