Pipeline Corrosion and Cathodic Protection

This update of Marshall Parker’s classic text contains the latest “hands-on” information for taking measurements and making the calculations necessary for cathodic protection of buried pipe lines. Essentially a practical field manual for corrosion technicians and engineers, it is a simple and direct introduction to the fundamentals of a complex subject.

The contents cover soil resistivity surveys, potential surveys, line currents, current requirement surveys, rectifier systems for coated lines, ground bed design and installation, galvanic anodes on coated lines, hot spot protection, bond protection, stray current electrolysis, interference, operation and maintenance, and coating inspection and testing. There are also helpful appendixes that explain the fundamentals of underground corrosion, basic principles of cathodic protection, tables of properties of metals, and attenuation equations.

While other books on corrosion are sometimes too theoretical for practical work, Pipe Line Corrosion and Cathodic Protection, Third Edition, shows you how to take actual field measurements and apply them to design a well-protected system.

Chapter 1: Soil Resistivity Surveys Soil Resistivity Units Two-Terminal Resistivity Determination Four-Terminal Resistivity Determination Other Methods Locating Hot Spots on Bare Lines Surveys for Ground Beds Area Surveys Logarithmic Resistivity Ranges Summary

Chapter 2: Potential Surveys Pipe-to-Soil Potentials: Electrodes Electrode Placement Pipe Line connection Surface Potential Survey for Corrosion Pipe-to-Soil Potential as a Criterion of Cathodic Protection Other Applications of Pipe-to-Soil Potentials Other Criteria Summary

Chapter 3: Line Currents Measurement of Line Current in Test Section Stray-Current Studies Long-Line Currents Cathodic Protection Tests Coating Conductance Measurement Summary

Chapter 4: Current Requirement Surveys The Problem: Coated Lines Principles of Current Requirement Test Current Sources for Tests Temporary Ground Beds Special Conditions Summary

Chapter 5: Rectifier Systems for Coated Lines General Design Principles Attenuation Curves Line Termination Anode Proximity Effects Attenuation with Multiple Drain Points Design Procedure An Alternate Method The Economic Balance Summary

Chapter 6: Ground Bed Design and Installation Design Principles Disturbing Factors Field Modification Installation Methods High-Silicon Iron Anodes Steel Anodes Horizontal Graphite Anodes Deep Anodes A Typical Ground Bed Installation Summary

Chapter 7: Galvanic Anodes on Coated Lines When and Where to Use Magnesium When and Where to Use Zinc General System Design Installation Procedure Polarization and Final Adjustment Modification of Process with Experience Sample Problems Summary

Chapter 8: Hot Spot Protection What Hot Spots Are Hot Spot Protection Locating Hot Spots Anode Selection and Spacing Field Installation Field Design Zinc Anodes in Hot Spot Protection Installation Details Supervision and Control Summary

Chapter 9: Stray-Current Electrolysis Stray Current Corrosion Sources of Stray Currents Detection of Stray Current Remedial Measures Negative Bus Bonding Exposure Areas Potential Surveys Secondary Exposure Summary

Chapter 10: Interference In Cathodic Protection The Problem Basic Solutions Design Crossing Bonds Calculation of Bond Resistance Multiple Bonds Auxiliary Drainage Parallel Lines Radial-Flow Interference Foreign Lines with Insulating Joints Summary

Chapter 11: Operation and Maintenance Importance of Adequate Supervision Failures in Rectifier-Ground Bed Systems Failures in Magnesium Anode Systems Minimum Inspection Schedule for Rectifier-System Minimum Inspection Schedule for Anodes Monitor System Troubleshooting Summary

Chapter 12: Coating Inspection and Testing Construction Inspection Evaluation of Coating in Place Coating or Leakage Conductance Pearson Surveys Accelerated Coating Tests Summary

Appendices Appendix A: Fundamentals of Corrosion. Appendix B: Cathodic Protection of Steel in Soil. Appendix C: Corrosion of Steel in Soil. Appendix D: Attenuation Equations

Index