ABSTRACT

This paper highlights the importance of implementing a robust corrosion management program for copper-nickel tubes in seawater applications. Although these alloys are known for their natural resistance to seawater corrosion, failures can occur due to various factors such as inadequate corrosion management program and insufficient control of deposits accumulation and bacterial growth.

The investigation discussed in this paper focuses on the premature Microbiologically Influenced Corrosion (MIC) failure of copper-nickel tubes in a Trim-cooler equipment that operated for only seven (7) months. The findings suggest that the causal factors of the failure were related to the accumulation of deposits and the growth of bacteria in the seawater, which compromised the protective surface film on the tubes and accelerated the corrosion process.

To address this issue, the study recommends the implementation of an effective bacteria treatment and deposits filtration system to prevent the build-up of harmful materials in the seawater. This can be achieved through regular monitoring and cleaning of the equipment, as well as the use of adequate filtration and treatment technologies that are tailored to the specific needs of copper-nickel alloys in seawater applications.

Overall, this paper emphasizes the importance of a proactive approach to corrosion management in seawater applications, particularly when using copper-nickel alloys. By implementing the right corrosion control measures, it is possible to extend the service life of equipment, minimize downtime and maintenance costs, and ensure safe and reliable operations in harsh marine environments.

INTRODUCTION

The refining industry has made significant strides in technology and materials science, resulting in increased efficiency and reliability of various refinery units. Despite these advancements, unexpected failures persist, leading to costly downtime and potential safety hazards. A recent instance of premature failure in a newly commissioned Naphtha Hydrotreating unit (NHT) highlights the challenges that still exist in maintaining the integrity of critical infrastructure. In this case, a heat exchanger with copper-nickel tubes experienced rapid degradation due to microbiologically influenced corrosion (MIC). The purpose of the subject Naphtha Hydrotreating unit (NHT) is to protect the Continuous Catalysis Reformer (CCR) and Isomerization catalysts by eliminating or reducing to an acceptable level the impurities of the heavy and light naphtha.

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