Page 11 - Know and Understand Centrifugal Pumps

Contents

10 Pump and Motor Alignment 142
Introduction 142
Types of misalignment 144
Alignment techniques 145
Equipment alignment sequence 153
Coupling alignment 153

11 Bearings 155
Introduction 155
Bearing lubrication 157
Bearing failure 159
Bearing maintenance 163
Bearing seals 167

12 Pump Shaft Packing 171
History 171
Vegetable fibers 171
Reciprocating action 172
Packing 173
Rotary action 173
Synthetic fibers 174
Compression packing 175
The lantern ring 177
The packing lubricant 178
Stages in the life of packing 178

13 Mechanical Seals 180
Pump packing 180
History 182
The mechanical seal 184
The single, unbalanced, inside mounted mechanical seal 185
The single, outside-mounted, unbalanced seal 186
The single, balanced, internal mechanical seal 186
The single, balanced, external mechanical seal 187
Advantages of O-rings 187
The balance effect 188
Advantages of balance 189
Balance explained by math 190
Cartridge mechanical seals 192
Double seals 194
The tandem dual seal 195
The back-to-back double seal 196

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