Pig Gathering System Pipelines
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Total Pages: 101
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Training Objectives
Upon completion of this training kit on pigging gathering system pipelines, you will be able to:
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Describe the purpose and importance of pigging operations for gathering system maintenance
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Describe reasons for pigging gathering systems
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Describe causes of internal corrosion
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Describe different types of pigs and their uses
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Describe pig launching and receiving equipment
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Describe pig launching and receiving practices
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Describe methods used to clean a pig
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Describe methods used to locate and free stuck pigs
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Describe inspection pigs
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Launch and receive pigs
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Table of Contents
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Training Objectives
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1
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1
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Introduction
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1
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2
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Internal Line Corrosion and Reduced Flow Rates
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2
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3
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Pigs
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4
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4
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Pig Launchers and Receivers
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8
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4.1 Pigging Valves
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8
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4.2 Pig Injector Tees
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10
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4.3 Wire Mesh Basket Receivers
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12
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4.4 Barrel-shaped Pig Launchers and Receivers
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13
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4.5 Closures
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14
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5
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Operating Practices
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18
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5.1 Safety and Environment
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18
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5.2 Launcher/Receiver On-Line or Isolated
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19
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5.3 Draining and Venting
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21
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5.4 Venting Trapped Air
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22
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5.5 Purging
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23
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5.6 Removing Pigs
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23
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5.7 Key Interlock Systems
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23
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5.8 Other Practices
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24
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6
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Pigging Practices
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24
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6.1 General Considerations
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24
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6.2 Pig Launching Practices
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26
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6.3 Pig Receiving Practices
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32
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6.4 Pig Cleaning
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36
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7
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Stuck and Lost Pigs
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38
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8
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Batch Treating
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41
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9
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Line Gauging, Testing, Internal Inspection
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43
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10
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Self-Check
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45
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11
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Self-Check Answers
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50
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