DESIGN OF CENTRIFUGAL PUMPS - Major Technical Report - Chapter 1 Introduction - Procedure for the Design of Centrifugal Pump

Oct 24, 2026

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A practical approach to the design of centrifugal pumps is presented through a structured review of general pump features and a brief outline of the design procedure. Key equations for determining impeller and casing dimensions are provided, alongside empirical relationships drawn from experimental data where available. The sources of unbalanced forces in the pump casing are identified, with methods to compute their magnitudes. Mechanical components are summarized and a design example illustrates the approach.

LanguageEnglish

CategoryResearch & Report

FormatPDF

Pages99

Reading Time4 h 9 min

AccessFree to download

ABSTRACT

ACKNOWLEDGEMENTS

TABLE OF CONTENTS

CHAPTER 1. INTRODUCTION

1.1 PRINCIPAL FEATURES OF CENTRIFUGAL PUMPS

1.2 PERFORMANCE VARIABLES

1.3 OPERATIONAL AND DESIGN CONSIDERATIONS

1.4 PROCEDURE FOR THE DESIGN OF CENTRIFUGAL PUMP

CHAPTER 2. IMPELLER DESIGN

2.1 INTRODUCTION

2.2 IMPELLER DIMENSIONS

CHAPTER 3. CASING DESIGN

3.1 CASING - VOLUTE TYPE

CHAPTER 4. UNBALANCED FORCES

4.1 UNBALANCED FORCES DEVELOPED IN PUMP CASING

CHAPTER 5. MECHANICAL DETAILS

5.1 CASING

5.2 IMPELLER

5.3 SHAFT

5.4 CRITICAL SPEED

5.5 BEARINGS

CHAPTER 6. CONCLUSION

REFERENCES

APPENDIX. DESIGN EXAMPLE

DESIGN OF CENTRIFUGAL PUMPS Feroz Ahmad ( A Major.Technical Report in The Faculty of, Engineering" Presented in Partial Fulfillment of the Requirementsfor the·Degree of Master of Engineering atConcordia UniversityMontrea1,Quebec,'Canada Apri1,1979 Feroz Ahmad,1979 # ABSTRACT DESIGN OF CENTRIFUGAL PUMPS. Ferdz Ahmad A .practical approach to the design of centrifugal pumps is illustrated.The general features of centrifugal pumps are reviewed and a briefdiscussion of the design procedure is out1ined.Equations necessaryto determine the dimensions of the impeller and casing are presented.Empirical relationships based on experimental.data are mentioned wher-ever ava lable.The origin of the unbalanced forces developed in thepump casing is identified and methods to calculate the magnitude ofsuch forces are given.Basic mechanical components of centrifugal pumpsare summarised and a design example illustrating the approach andprocedure out1ined in this report is presented.e ( # AKNOMLEDGEMENTS The author wishes to express his appreciation to Dr.G、D.Xistrisfor the invaluable suggestions,encouragement and time spent by himthroughout the course of this.report. The author also wishes to thank Miss Clotilde Leone for typingthis report. Q iii'- # TABLE OF CONEENTS ABSTRACTAKNOMLEDGEMENTSLIST OF 'FIGURESLIST OF TABLESNOMENCLATURECHAPTER 1.INTRODUCTION 1.1 PRINCIPAL FEATURES OF CENTRIFUGAL PUMPS。 1.2 /PERFORMANCE VARIABLES 1.3°OPERATIONAL AND BESIGN CONSIDERATIONS 1.4 PROCEDURE FOR THE DESIGN'OF CENTRIFUGAL PUMP 1.4.1.Design Criteria 1.4.2 Design Data ## CHAPTER 2.IMPELLER'DESIGN 2.1 INTRODUCTION ?, Velocity Components 2.1.1 2.1.2 Angles. 2.1.3 Prerotation of Fluid ·2.1.4Slip 2.2 IMPELLER DIMENSIONS °2.2.1Inlet section 2.2.2Outlet Section 2.2.3Vanes ## CHAPTER 3.·CASING DESIGN 3.1 CASING-XOLUTE TYPE PAGE 1. ii V vi viii 1. 5 59 6 9 10 10 12 13 16 23 28 30 30· ## CHAPTER 4. UNBALANCED FORCES 4.1'UNBALANCED FORCES DEVELOPED IN PUMP CASING 4.1.1 Radial ThrustI ,Id T USL 4.1.2 Axial Thrust ## CHAPTER 5.MECHANICAL DETAILS 5.1:CASING 5.2 IMPELLER 5.3 SHAFT Q 5.4:CRITICAL SPEED 5.5 BEARINGS ## CHAPTER 6. CONCLUSIONREFERENCES APPENDIX. DESIGN EXAMPLE 37- 37 37. 38 '46 46 46 47 47 49 51 52 55 FIGURE 1.1 FIGURE 1.2 FIGURE 1.3 FIGURE 1.4 FIGURE 2.1, FIGURE 2.2 FIGURE 2.3 —FIGURE 2.4 FIGURE 2.5 FIGURE 2.6 FIGURE 2.7 FIGURE 2.8 FIGURE 3.1 FIGURE 3.2 FIGURE 3.3 FIGURE 3.4 FIGURE 3.5 FIGURE 4.1 # LIST OF FIGURES ,PAGE Typical Yolute-Type PumpTypical Dfffuser-Type PumpCharacteristic ACurve 2 # Efficfency as a Function of Specific Speedand Capacity Velocity'Diagrams for Radial-Flow ImpellersInlet Velocity Triangle Without PrerotationOutlet Velocity Triangle Taking Into.Account the S1ip ·11 12 14 Typical Inlet Section With Corres pondingIn1et Velocity Triangle, 15 Volumetric Efficiency as a Function ofSpecific Speed and Capacity, 19 Typical Outlet Section Wi'th CorrespondingOutlet Velocity Triangle .21 Versus Specific Speed 25 26 Impeller Discharge Angle Versus SpecificSpeed Versus Specific Speed 31 32 Volute Casing 33 Volute Shape Section Volute Diffuser 34 Ctn-Throat vělocity versus Angle of Diffuser 36“ .39 K、as a Function of Specific Speed andCapacity for Single Volute Pump· FIGURE 4.2 FIGURE 4.3 FIGURE 4.4 FIGURE 4.5, FIGURE 4.6. FIGURE 5.1 FIGURE 5.2 FIGURE A-1(A) 童FIGURE A-1(B) FIGURE A-2. FIGURE A-3 FIGURE A-4 Origin of Pressure Acting on ImpellerShrouds to_Produce Axial Thrust Actual Pressure Ds ptrib绝tion on Frontand Back Shrouds of Single suction ImpeiJerWith Shaft Through Impeller Eye Axial Thrust in Single-Suction OverhungIImpeller· Balancing Axial Thrust of Single-SuctionImpeller by Means of Wearing Ring on BackSide and Balancing Holes Effect of

FAQs

What does the report cover about centrifugal pump design?

It reviews general features of centrifugal pumps and outlines a practical design procedure. It provides equations for impeller and casing dimensions and mentions empirical relationships from experimental data where available.

How are unbalanced forces in the pump casing handled in the report?

The report identifies the origin of unbalanced forces developed in the pump casing. It also gives methods to calculate the magnitude of these forces.

What example is included to illustrate the design approach?

An appendix provides a design example that illustrates the approach and the design procedure outlined in the report.

Oct 24, 2026

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