FACTORS INFLUENCING ACCELERATED CORROSION OF CARGO OIL TANKS

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Introduction

Corrosion of cargo tank structure is a fact of life when operating oil tankers in the harsh environment encountered at sea. The internal structure of the cargo tanks, often un-coated, is exposed to potentially corrosive gases, sea water, crude oil and oil products.
The effect of this corrosion over a period of years is to reduce the material thickness and hence the strength of the structure. Classification Society design rules typically incorporate an allowance for corrosion that is based on a certain amount or degree of corrosion. Should corrosion proceed at an accelerated rate greater than that allowed for in the design of the cargo tank structures and be allowed to continue unchecked, then a structural failure with consequent oil spillage, explosion or loss of the ship could be the result Individual tankers usually exhibit a unique, but controllab pattern. However, recent experiences of OCIMF members have indicated problems in new single and double hull tonnage from excessive pitting of up to 2.0 mm per year in the un-coated bottom plating in cargo tanks due, inter alia, to microbial induced corrosion processes. In addition accelerated general corrosion up to 0.24mm per year has been found in vapour spaces. This type of wastage and the increased rate of corrosion, which is much greater than that which would be normally expected, gives cause for serious concern.

Table of Contents
CHAPTER ONE: INTRODUCTION
1.1 Background of the Study
1.2 Statement of the Problem
1.3 Purpose of the Study
1.4 Significance of the Study
1.5 Research Questions
1.6 Delimitations of the Study
1.7 Limitation of the study
CHAPTER TWO: REVIEW OF RELATED LITERATURE
2.1 Review of Related Literature
2.3 Empirical Studies
2.3 Theoretical Framework
CHAPTER THREE: RESEARCH METHOD
3.1 Introduction
3.2 Area of the Study
3.3 Research Design
3.4 Population of the Study
3.5 Sample and Sampling Technique
3.6 Research Instrument
3.7 Validation of the Instrument
3.8 Data Collection Technique
3.9 Data Analysis Technique
CHAPTER FOUR: DATA PRESENTATION, ANALYSIS
AND DISCUSSION
4.1 Introduction
4.2 Data Presentation
4.3 Discussion of Findings
CHAPTER FIVE: SUMMARY, CONCLUSION AND
RECOMMENDATIONS
5.1 Introduction
5.1 Restatement of the Problem
5.2 Summary of Findings
5.3 Conclusion
5.4 Recommendations
5.5 Suggestions for Further Research
References
Appendix


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