Page 10 - Pipeline Pigging Technology

Corrosion inspection of the Trans-Alaska pipeline 179
Alyeska's experience 180
Ethylene pipeline cleaning, integrity and metal-loss
assessment 189
Background 190
Project organization 190
Prework 191
Project plans 191
Project execution 196
Project results 201
Pipeline isolation: available options and experience 205
Oil lines 206
Gas lines 206
Subsea valves 210

Part 3: Pigging Techniques and Equipment

The history and application of foam pigs 215
What is a polly pig? 215
History 216
Specification and design 217
Common types of polly pig 218
Advantages of the polly pig 219
Pigging and chemical treatment of pipelines 223
Paraffin treatment 224
Corrosion control in pipelines 227
Biocide treatment of pipelines 231
Selection of pig design 232
Specialist pigging techniques 237
Pipeline gel technology: applications for commissioning
and production 243
Introduction to gel technology 243
Types of gel 246
Polymer gel pig 249
Pig-lnto-place plugs and slugs 251
Gel isolation 252
Pipe freezing 254
Gels and high-sealant pigs 255
Packer pig 256
Pigging for pipeline integrity analysis 259
Tool description 261

xi