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Alfa Laval Pump Handbook Second Edition 2002

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Alfa Laval Pump Handbook Second Edition 2002 All you need to know ... Alfa Laval Pump Handbook Second edition 2002 The information provided in this handbook is given in good faith, but Alfa Laval is not able to accept any responsibility for the accuracy of its content, or any consequences that may arise from the use of the information supplied or materials described. Inside view This pump handbook has been produced to support pump users at all levels, providing an invaluable reference tool. The handbook includes all the necessary information for the correct selection and successful application of the Alfa Laval ranges of Centrifugal, Liquid Ring and Rotary Lobe Pumps. The handbook is divided into fifteen main sections, which are as follows: 1 Introduction 9 Motors 2 Terminology and Theory 10 Cleaning Guidelines 3 Pump Selection 11 Compliance with International Standards and Guidelines 4 Pump Description 12 Installation Guide 5 Pump Materials of Construction 13 Troubleshooting 6 Pump Sealing 14 Technical Data 7 Pump Sizing 15 Glossary of Terms 8 Pump Specification Options Alfa Laval Pump Handbook 1 Contents Section 1: Introduction Section 5: Pump Materials of Construction Introduction of the Pump Handbook. 5 Description of the materials, both metallic and elastomeric, that are used in the construction of 1.1 What is a Pump? 5 Alfa Laval pump ranges. 61 Section 2: Terminology and Theory 5.1 Main Components 61 Explanation of the terminology and theory of 5.2 Steel Surfaces 63 pumping applications, including rheology, 5.3 Elastomers 65 flow characteristics, pressure and NPSH. 7 Section 6: Pump Sealing 2.1 Product/Fluid Data 8 Explanation of pump sealing principles with illustrations 2.1.1 Rheology 8 of the different sealing arrangements used on 2.1.2 Viscosity 8 Alfa Laval pump ranges. A general seal selection guide is 2.1.3 Density 12 included, together with various operating parameters. 67 2.1.4 Specific Weight 12 2.1.5 Specific Gravity 13 6.1 Mechanical Seals - General 70 2.1.6 Temperature 13 6.2 Mechanical Seal Types 2.1.7 Flow Characteristics 13 in Alfa Laval Pump Ranges 80 2.1.8 Vapour Pressure 17 6.3 Other Sealing Options (Rotary Lobe Pumps only) 82 2.1.9 Fluids Containing Solids 17 2.2 Performance Data 18 Section 7: Pump Sizing 2.2.1 Capacity (Flow Rate) 18 How to size an Alfa Laval pump from product/fluid and 2.2.2 Pressure 18 performance data given, supported by relevant calculations 2.2.3 Cavitation 30 and worked examples with a simple step by step approach. 85 2.2.4 Net Positive Suction Head (NPSH) 31 2.2.5 Pressure ‘Shocks’ (Water Hammer) 35 7.1 General Information Required 85 7.2 Power 86 Section 3: Pump Selection 7.2.1 Hydraulic Power 86 Overview of the pump ranges currently available from 7.2.2 Required Power 87 Alfa Laval and which particular pumps to apply within 7.2.3 Torque 88 various application areas. 39 7.2.4 Efficiency 88 7.3 Centrifugal and Liquid Ring Pumps 92 3.1 General Applications Guide 40 7.3.1 Flow Curve 92 3.2 Pumps for Sanitary Applications 41 7.3.2 Flow Control 96 3.3 PumpCAS Selection and Configuration Tool 43 7.3.3 Alternative Pump Installations 100 7.4 Worked Examples Section 4: Pump Description of Centrifugal Pump Sizing (Metric Units) 102 Description of Alfa Laval pump ranges including design, 7.4.1 Example 1 102 principle of operation and pump model types. 45 7.4.2 Example 2 106 7.5 Worked Examples 4.1 Centrifugal Pumps 45 of Centrifugal Pump Sizing (US Units) 109 4.1.1 General 45 7.5.1 Example 1 109 4.1.2 Principle of Operation 46 7.5.2 Example 2 113 4.1.3 Design 46 7.6 Rotary Lobe Pumps 116 4.1.4 Pump Range 48 7.6.1 Slip 116 4.2 Liquid Ring Pumps 52 7.6.2 Initial Suction Line Sizing 118 4.2.1 General 52 7.6.3 Performance Curve 119 4.2.2 Principle of Operation 52 7.6.4 Pumps fitted with Bi-lobe Rotors 4.2.3 Design 53 (Stainless Steel) 124 4.2.4 Pump Range 55 7.6.5 Pumps fitted with Bi-lobe Rotors 4.3 Rotary Lobe Pumps 56 (Non Galling Alloy) 125 4.3.1 General 56 7.6.6 Pumps fitted with Tri-lobe Rubber Covered Rotors 125 4.3.2 Principle of Operation 56 7.6.7 Pumps with Electropolished Surface Finish 126 4.3.3 Pump Range 57 7.6.8 Guidelines for Solids Handling 127 7.6.9 Guidelines for Pumping Shear Sensitive Media 128 7.7 Worked Examples of Rotary Lobe Pump Sizing (Metric Units) 129 7.8 Worked Examples of Rotary Lobe Pump Sizing (US Units) 143 Alfa Laval Pump Handbook 2 Section 8: Pump Specifications Options 12.2 Flow Direction 201 Description of the various specification options available 12.2.1 Centrifugal Pumps 201 for the Alfa Laval pump ranges, such as port connections, 12.2.2 Rotary Lobe Pumps 202 heating/cooling jackets, pressure relief valves and other 12.3 Baseplates Foundation (Rotary Lobe Pumps only) 203 ancillaries. 157 12.4 Coupling Alignment (Rotary Lobe Pumps only) 204 12.5 Special Considerations for Liquid Ring Pumps 204 8.1 Centrifugal and Liquid Ring Pumps 157 12.5.1 Pipework 204 8.1.1 Port Connections 157 8.1.2 Heating/Cooling Jackets 158 Section 13: Troubleshooting 8.1.3 Pump Casing with Drain 159 Advises possible causes and solutions to most common 8.1.4 Increased Impeller Gap 159 problems found in pump installation and operation. 205 8.1.5 Pump Inlet Inducer 159 8.2 Rotary Lobe Pumps 160 13.1 General 205 8.2.1 Rotor Form 160 13.2 Common Problems 206 8.2.2 Clearances 162 13.2.1 Loss of Flow 206 8.2.3 Port Connections 164 13.2.2 Loss of Suction 206 8.2.4 Rectangular Inlets 165 13.2.3 Low Discharge Pressure 207 8.2.5 Heating/Cooling Jackets and Saddles 166 13.2.4 Excessive Noise or Vibration 207 8.2.6 Pump Overload Protection 167 13.2.5 Excessive Power 208 8.2.7 Ancillaries 169 13.2.6 Rapid Pump Wear 208 13.2.7 Seal Leakage 208 Section 9: Motors 13.3 Problem Solving Table 209 Description of electric motors, including information on motor protection, methods of starting, motors for hazardous Section 14: Technical Data environments and speed control. 173 Summary of the nomenclature and formulas used in this handbook. Various conversion tables and charts are also 9.1 Output Power 175 shown. 213 9.2 Rated Speed 175 9.3 Voltage 176 14.1 Nomenclature 213 9.4 Cooling 176 14.2 Formulas 214 9.5 Insulation and Thermal Rating 176 14.3 Conversion Tables 219 9.6 Protection 177 14.3.1 Length 219 9.7 Methods of Starting 179 14.3.2 Volume 219 9.8 Motors for Hazardous Environments 180 14.3.3 Volumetric Capacity 219 9.9 Energy Efficient Motors 182 14.3.4 Mass Capacity 220 9.10 Speed Control 184 14.3.5 Pressure/Head 220 9.11 Changing Motor Nameplates 14.3.6 Force 220 - Centrifugal and Liquid Ring Pumps only 186 14.3.7 Torque 220 14.3.8 Power 221 Section 10: Cleaning Guidelines 14.3.9 Density 221 Advises cleaning guidelines for use in processes utilising 14.3.10 Viscosity Conversion Table 222 CIP (Clean In Place) systems. Interpretations of 14.3.11 Temperature Conversion Table 224 cleanliness are given and explanations of the cleaning 14.4 Water Vapour Pressure Table 225 cycle. 189 14.5 Pressure Drop Curve for 100 m ISO/DIN Tube 226 14.6 Velocity (m/s) in ISO and DIN Tubes Section 11: Compliance with International at various Capacities 227 Standards and Guidelines 14.7 Equivalent Tube Length Table 228 Description of the international standards and guidelines 14.7.1 ISO Tube Metric 228 applicable to Alfa Laval pump ranges. 193 14.7.2 ISO Tube Feet 230 14.7.3 DIN Tube Metric 232 Section 12: Installation Guide 14.7.4 DIN Tube Feet 234 Advises guidelines relating to pump installation, 14.8 Moody Diagram 236 system design and pipework layout. 199 14.9 Initial Suction Line Sizing 237 14.10 Elastomer Compatibility Guide 238 12.1 General 199 14.11 Changing Motor Name Plates 243 12.1.1 System Design 199 12.1.2 Pipework 200 Section 15: Glossary of Terms 12.1.3 Weight 200 Explains the various terms found in this handbook. 249 12.1.4 Electrical Supply 200 Alfa Laval Pump Handbook 3 ...if pumps are the question Alfa Laval is an acknowledged market leader in pumping technology, supplying Centrifugal and Positive Displacement Pumps world-wide to various key application areas such as food, brewery and pharmaceutical. Introduction 1. Introduction This section gives a short introduction of the Pump Handbook. 1.1 What is a Pump? There are many different definitions of this but at Alfa Laval we believe this is best described as: ‘A machine used for the purpose of transferring quantities of fluids and/or gases, from one place to another’. This is illustrated below transferring fluid from tank A to spray nozzles B. Fig. 1.1a Typical pump installation Pump types generally fall into two main categories - Rotodynamic and Positive Displacement, of which there are many forms as shown in Fig. 1.1b. The Rotodynamic pump transfers rotating mechanical energy into kinetic energy in the form of fluid velocity and pressure.
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