Pipeline Corrosion and Cathodic Protection

Marshall Parker, Edward G. Peattie9780872011496, 0-87201-149-6

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.

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Table of contents :
Contents……Page 6
Preface to Third Edition……Page 8
Preface to First Edition……Page 10
Soil Resistivity Units……Page 12
Two-Terminal Resistivity Determination……Page 13
Four-Terminal Resistivity Determination……Page 14
Other Methods……Page 16
Locating Hot Spots on Bare Lines……Page 17
Surveys for Ground Beds……Page 19
Area Surveys……Page 21
Logarithmic Resistivity Ranges……Page 22
Pipe-to-Soil Potentials: Electrodes……Page 27
Electrode Placement……Page 33
Pipe Line Connection……Page 35
Surface Potential Survey for Corrosion……Page 36
Pipe-to-Soil Potential as a Criterion of Cathodic Protection……Page 38
Other Criteria……Page 40
Measurement of Line Current in Test Section……Page 42
Long-Line Currents……Page 45
Coating Conductance Measurement……Page 46
The Problem: Coated Lines……Page 47
Principles of Current Requirement Test……Page 48
Current Sources for Tests……Page 53
Special Conditions……Page 54
Attenuation Curves……Page 56
Line Termination……Page 61
Attenuation with Multiple Drain Points……Page 62
An Alternate Method……Page 63
The Economic Balance……Page 68
Design Principles……Page 70
Disturbing Factors……Page 78
Field Modification……Page 79
Installation Methods……Page 80
High-Silicon Iron Anodes……Page 81
Steel Anodes……Page 83
Horizontal Graphite Anodes……Page 84
A Typical Ground Bed Installation……Page 85
When and Where to Use Magnesium……Page 89
When and Where to Use Zinc……Page 90
General System Design……Page 91
Installation Procedure……Page 92
Polarization and Final Adjustment……Page 94
Sample Problems……Page 98
Hot Spot Protection……Page 99
What “Hot Spots” Are……Page 0
Locating Hot Spots……Page 100
Anode Selection and Spacing……Page 103
Field Installation……Page 107
Zinc Anodes in Hot Spot Protection……Page 108
Installation Details……Page 109
Supervision and Control……Page 110
Sources of Stray Currents……Page 111
Remedial Measures……Page 114
Negative Bus Bonding……Page 115
Exposure Areas……Page 116
Potential Surveys……Page 117
Secondary Exposure……Page 118
The Problem……Page 120
Design……Page 121
Crossing Bonds……Page 122
Calculation of Bond Resistance……Page 125
Auxiliary Drainage……Page 130
Parallel Lines……Page 132
Foreign Lines with Insulating Joints……Page 133
Importance of Adequate Supervision……Page 136
Failures in Rectifier-Ground Bed Systems……Page 137
Minimum Inspection Schedule for Rectifier System……Page 140
Monitor System……Page 143
Troubleshooting……Page 144
Construction Inspection……Page 147
Coating or Leakage Conductance……Page 150
Pearson Surveys……Page 153
Accelerated Coating Tests……Page 155
Appendix A: Fundamentals of Corrosion……Page 157
Appendix B: Cathodic Protection of Steel in Soil……Page 161
Appendix C: Corrosion of Steel in Soil……Page 164
Appendix D: Attenuation Equations……Page 171
C……Page 174
F……Page 175
P……Page 176
Z……Page 177