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External corrosion of subsurface metallic objects such as pipelines, storage tank bottoms, sea going vessels, jetties and piers, is not a strange phenomena to those who are particularly involved in the oil and gas industries, marine installations, power plants and fertilizer plants etc., the list can go on and on.
External corrosion of subsurface metallic objects such as pipelines, storage tank bottoms, sea going vessels, jetties and piers, is not a strange phenomena to those who are particularly involved in the oil and gas industries, marine installations, power plants and fertilizer plants etc., the list can go on and on.
Corrosion involves an electrochemical reaction between metal and its environment and occurs as electricity flows off of a pipe and into the ground. This flow will take some metal with it, and a leak can eventually develop. Increasing the wall thickness of pipe to allow for corrosion will not increase a pipe’s service life because corrosion is not uniform but is concentrated at local areas. However, installation and maintenance techniques have been developed to protect metal pipe from corrosion for many years.
Much can be done to reduce the rate of corrosion of old pipe, but it may not be economical to protect it completely. The goal of corrosion prevention work is to control the flow of electricity. This is achieved by cathodic protection systems such as galvanic and impressed current, pipe coatings, and electrical isolation from other underground metallic structures or casings.
The effectiveness of cathodic protection in controlling corrosion is well recognized through out the world. Corrosion handbooks, textbooks and manuals have been written on this subject by well-known authors and researchers. Continuing research is ongoing and as a result new materials and techniques are being made available by institutions such as N.A.C.E. in their technical publications.
Any Corrosion Protection provided through Cathodic Protection Technology shall be regularly inspected and monitored to assure it provides intended corrosion protection to the structures.
This course gives basic ideas for various aspects of Cathodic Protection Systems inspection and monitoring requirements. This covers basics of corrosion, cathodic protection systems and its types, various instruments and how it shall be used, methods, safety and troubleshooting fundamentals.
Table of content for the entire course syllabus.
Attendees’ Guide for Training "Cathodic Corrosion Protection: Inspection and Monitoring".
At the end of this lecture, students will be able to:
1) Basic fundamentals of chemistry and electrochemistry related to corrosion process.
2) Understand corrosion cell and its components
3) Applicability of Faraday's law and its relation with corrosion rate
4) By which factors, the corrosion rate gets affected
5) Very basic factors causing corrosion
At the end of this lecture, students will:
1) Various ways of controlling corrosion process and how cathodic protection (CP) can be one of them
2) Which are the structures can be protected by CP system and two basic types of CP systems
3) Various components and type of anodes generally used in each kind of CP system
4) Factors influencing operation of CP system
5) Various local and international criterion to assess the performance of CP system
At the end of this lecture, students will be able to demonstrate:
1) Basic measurements involved in monitoring the performance of CP System
2) Type and use of various reference electrodes
3) Ways and use of current measurement
4) Importance and methods of measuring resistance and resistivity
5) How to confirm electrical shorting and isolation
6) Pipeline and cable locating
7) pH measurement
8) Use of coupons
At the end of this lecture, students will learn:
1) How to execute CP Monitoring job in safe way
2) To recognize and eliminating hazards involved in CP Monitoring activities
3) Type of hazards associated with different monitoring activities
4) Troubleshooting CP Faults and malfunctioning
5) To solve Isolation and shorting issues
6) Identify and prepare solution plan for CP Rectifier output related problems.
At the end of this lecture, students will be able to understand:
1) Various aspects of managing CP system of a plant
2) Importance of regular monitoring of CP system and data record keeping
3) What shall be scope and frequency for monitoring
4) CP Inspector requirement and responsibilities
Self Study Review Questions
Let’s see what you learned about Cathodic Protection Inspection and Monitoring. Use the information in the workbook to answer these questions.
Instructions
1. Answer the questions below.
2. Review your answers with your mentor/trainer. When your mentor/trainer is satisfied with your answers, continue to the last Lecture No. 15 (Section 6) : Multiple Choice Questions.
In this lecture section, we will provide you with 212 multiple choice questions to judge your understanding and ability to demonstrate the various concepts of Cathodic Protection Inspection and Monitoring.
At the end of the quiz, you will the answer keys to be able to rate yourself honestly.
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