Electrical Design - Cathodic Protection Part I
Basic Concepts and Fundamentals
Bijan Ghayour, P.E.
This 12-hour course provides detailed information on the basic concepts and fundamentals of the cathodic protection systems, including an understanding of the cathodic protection concepts, cathodic protection system design principals, differences between impressed current and sacrificial anode systems, corrosivity of soils on steel based materials, and provides guidelines and examples for designing cathodic protection systems for underground and above ground structures.
Cathodic protection is an electromechanical method used to prevent or control corrosion of buried or submerged metallic structures. Cathodic protection systems are active systems that rely on the application of electric current to control corrosion. If current is interrupted, corrosion will progress at a normal rate for the material/environment combination; if supplied current is inadequate for complete protection, corrosion will progress at a reduced rate. After a cathodic protection system is installed and adjusted to provide adequate protection, current and potentials should remain relatively stable; changes in currents or potentials indicate the presence of a problem.
This course offers recommendations and practical guidelines for understanding the fundamentals, and basic concepts; and for the proper and economical design of cathodic protection systems for variety of applications.
Part II of this course, covered in PDH course number E-223, provides detailed information on the installation and construction practices, system checkout and initial adjustments, maintenance of cathodic protection systems, and economic analysis.
The course materials
are based entirely on the military handbook MIL-HDBK-1004/10 of Department of
the Army: Electrical Engineering - Cathodic Protection.
This course includes
a multiple-choice quiz at the end, which is designed to enhance the understanding
of course materials.
The purpose of this course is to provide the basic understanding and fundamentals of the cathodic protection systems.
At the conclusion
of the course the student will be familiar with the:
This course is
intended for electrical engineers and maintenance personnel involved in the
design, service, maintenance, and upgrade of cathodic protection systems.
Benefit to Attendees
This course is intended for use in the design of cathodic protection systems for the mitigation of corrosion of buried or submerged metallic structures.
Design of cathodic
protection systems is somewhat different than design of other electrical or
mechanical systems because it must be based upon local environmental conditions
such as soil resistivity and moisture content.
This course presents criteria for cathodic protection, methodologies for the determination of required environmental conditions, methodologies for design of cathodic protection systems, examples of typical systems and design calculations, recommended initial system checkout procedures, and system maintenance requirements.
After the completion
of the course the attendees will be able to evaluate the existing conditions
at a specific site and determine the need for a cathodic protection system.
The attendees will also be able to recommend an appropriate system based on
the various field conditions and proceed with the design of a functional and
economic cathodic protection system for different corrosion protection purposes.
In most industrial, naval, and utility projects the corrosion of buried or submerged metallic structures will result in various kinds of failures resulting in loss of services and production.
This course provides detailed information on the basic concepts and fundamentals of the cathodic protection systems, including an understanding of the cathodic protection concepts, cathodic protection system design principals, differences between impressed current and sacrificial anode systems, corrosivity of soils on steel based materials, and provides guidelines and examples for designing cathodic protection systems for underground and above ground structures.
By proper selection and the design of an appropriate cathodic protection system, the life of buried or submerged metallic structures can be extended many folds, resulting in more reliable systems and substantial saving in equipment replacement costs.
Part II of this
course, covered in PDH course number E-223, provides detailed information on
the installation and construction practices, system checkout and initial adjustments,
maintenance of cathodic protection systems, and economic analysis.
This course contains the basic principals and fundamentals of
different cathodic protection systems. This course also offer specific example
for the design and evaluation of the new or existing corrosion protection systems.
You are required to study sections 1 through 10 and Appendix A of the military
handbook MIL-HDBK-1004/10 of Department of the Army USA, ELECTRICAL ENGINEERING
ELECTRICAL ENGINEERING CATHODIC PROTECTION (PDF 2.7MB)
(For an electronic
copy of MIL-HDBK-1004/10 go to http://www.wbdg.org/ccb/DOD/UFC/ufc_3_570_02n.pdf)
Please click on the above underlined hypertext to view, download or print the document for your study. Because of the large file size, we recommend that you first save the file to your computer by right clicking the mouse and choosing "Save Target As ...", and then open the file in Adobe Acrobat Reader. If you still experience any difficulty in downloading or opening this file, you may need to close some applications or reboot your computer to free up some memory.
The following contains the outline of the FIST 4-1B of Department of Interior, Bureau of reclamation:
Table of Contents
Section 1- Introduction
Section 2- cathodic Protection Concepts
Section 3- Criteria for Cathodic Protection
Section 4- Cathodic Protection System Design Principals
Section 5- Precautions for Cathodic Protection System Design
Section 6- Impressed Current System
Section 7- Sacrificial Anode System Design
Section 8- Typical Cathodic Protection
Section 9- Cathodic Protection System Design Examples
Section 10- Installation and Construction Practices
Section 11- System Checkout and Initial Adjustments
Section 12- Maintaining Cathodic Protection
Section 13- Economic Analysis
Section 14- Corrosion Coordination Committee Participation
Appendix A- Underground
Corrosion Survey Checklist
Appendix B- Economic Life Guidelines
Appendix C- Project Year Discount Factors
Appendix D- Present Value Formulae
Appendix E- DOT Regulations