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FEDERAL UNIVERSITY OF PETROLEUM RESOURCES P.M.B 1221, EFFURUN DELTA STATE

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Description

TABLE OF CONTENT

LIST OF TABLES

LIST OF FIGURES

CHAPTER ONE                              INTRODUCTION

  • Background of study………………………………………………………..….3
  • Problem statement………………………………………..……………………..4
  • Aim and objectives……………………………………………….…………….4
  • Significant of study…………………….……………..………………………..4
  • Scope of study………………………….……………………………………….4

CHAPTER TWO                 LITERATURE REVIEW

  • Introduction ……………………………………………………………………5
  • What is corrosion……………………….…………………..…………………..5
    • Corrosion reaction….…………………..………………………….5
    • Factors affecting corrosion (corrosion cell).………………………6
    • Corrosion of Steel…………………………………..………….…..6
  • Forms of corrosion ………………………………………..………………..…..7
    • Soil and Water Corrosivity Factors ……………….………………8
    • Soil Corrosivity……………………………………………………8
    • Water corrosivity ………………………………………………….9
    • Factor Affecting Underground Corrosion…………………………9
  • Principle of cathodic protection………………………………………………..10
  • Method of applying cathodic protection system………………………….…….10
    • Impressed current cathodic protection……………………….……10
    • Sacrificial anode cathodic protection……………………………..12
    • Comparison table of the types of CP systems..………………..… 13
    • Protection criteria……………………………….…………………15
    • Limitations of cathodic protection system……………………..….15
    • Environmental parameters affecting cathodic protection………… 15
  • Cathodic protection system component…………………………………………16
    • Coatings in Conjunction with cathodic Protection……….……. …16
    • Reference Electrode……………………………………………… 16
    • Current Requirement Testing………………………………………17
    • Soil Resistivity Measurement………………………………………17
    • Monitoring And Maintenance Of Cathodic Protection……………19
  • Anode Resistance………………………………………………………………..19
    • Total Anode Resistance……………………………………………19

CHAPTER THREE             METHODOLOGY

  • Introduction…………………………………………………………………….21
  • General steps and evaluations………………………………………………….21
    • Cathodic protection criteria………………………………………..24
    • Design Parameters………………………………………………..24
  • Designing Test Rig…………………………………………………………….
  • Weighing Before and After Testing…………………………………………
  • Soil pH Testing………………………………………………………………

REFERENCES…………………………………………………………………………………..25

 

LIST OF TABLES

Table 2-1.Corrosivity of soils on steel based on soil resistivity………………………………..………9

Table 2.2 Resistivity of some environment……………………………………………………….………9

Table 2.3 Anode materials for ICCP system…………………………………………………………….11

Table 2.4 Sacrificial Anode Materials …………………………………………………………………..13

Table 3.1 Some structure and their potential……………………………………………………………21

Table 3.2 Current density of some electrolyte…………………………………………………….…….23

LIST OF FIGURES

Fig. 1. Corrosion cell…………………………………………………………………………………..……5

Fig 2. Corrosion reaction………………………………………………………………………………..…6

Fig 3. Corrosion Cell Element…………………………………………………………………………..…6

Fig 4. Typical ICCP System………………………………………………………………………..………11

Fig 5. Sacrificial Cell……………………………………………………………………………………….12

Fig 6. Galvanic Anode Cathodic Protection System……………………………………………………12

Fig 7. Cost Comparison of Cathodic Protection………………………………………………………..14

Fig 8. Wenner four-pin method for measuring soil resistivity ………………………………………….…18

Fig 9. Soil box method for measuring soil resistivity……………………………………………………..18

Fig 10. Anode resistance…………………………………………………………………………20

FEDERAL UNIVERSITY OF PETROLEUM RESOURCES

P.M.B 1221, EFFURUN DELTA STATE

 

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