Describe and Adjust Cathodic Protection Systems
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Total Pages: 78
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Training Objectives
Upon completion of this training kit, you will be able to:
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Describe the purpose and importance of cathodic protection systems
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Describe the use of cathodic protection at industrial facilities
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Explain the principles of corrosion
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Explain the difference between electron flow and current flow
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Describe electrical potential difference and its relationship to corrosion
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Identify the key components and functions of the following types of cathodic protection systems:
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sacrificial anode system
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impressed current system
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Describe the operator's monthly inspection of cathodic protection systems including:
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visual inspection of the cathodic protection equipment
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adjustment of the cathodic protection system power supply
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documentation of the monthly inspection
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identification of cathodic protection system problems
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Identify specific operating requirements for cathodically protected aluminum fuel gas lines
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Describe basic procedures used by electricians to troubleshoot and repair cathodic protection systems
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Identify site safety requirements and work hazards associated with:
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cathodic protection system components
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cathodically protected equipment
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isolated equipment
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Explain the purpose and importance of electrical isolation connections
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Identify possible equipment installation conditions where electrical isolation may be compromised
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Test and repair rectifiers and cables (electricians only)
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Table of Contents
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1
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Introduction
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2
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2
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Principles of Corrosion
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3
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2.1 Electric Current in Corroding Metals
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6
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2.2 Corrosion Circuit Potential Differences
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7
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3
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Cathodic Protection Systems
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9
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3.1 Theory of Operation
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10
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3.2 Types of Cathodic Protection Systems
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10
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4
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Sacrificial Anode Cathodic Protection Systems
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12
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4.1 Sacrificial Anode System Components and Functions
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12
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4.2 Sacrificial Anode System Metering and Instrumentation
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14
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4.3 Monitoring Sacrificial Anode Systems for Steel Process Equipment
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17
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4.4 Maintaining Sacrificial Anode Systems for Steel Process Equipment
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19
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4.5 Cathodic Protection of Aluminum Fuel Gas Lines
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20
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5
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Impressed Current Cathodic Protection Systems
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21
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5.1 Impressed Current System Components and Functions
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21
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5.2 Impressed Current System Power Supplies
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25
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5.3 Impressed Current System Metering and Instrumentation
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26
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5.4 Monitoring and Adjusting Impressed Current Systems
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30
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5.5 Maintaining Impressed Current Systems
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32
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6
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Electrical Isolation Connections
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35
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7
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Working Around Cathodic Protection Systems
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37
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8
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Self-Check
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39
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9
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Self-Check Answers
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45
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