CORROSION-RELATED EQUIPMENT FAILURES IN NIGERIA OIL/GAS INDUSTRY: A CASE STUDY
Publication Date : 31/01/2017
The focus of this study is to understand the prevalence of corrosion-related failures in Nigeria Oil/Gas Industry and seek ways to arrest the degradation of the facilities. The hash environmental conditions are known to severely affect the equipment integrity i.e., the exposure causes corrosion of the equipment. Events in the industry show that failures of these equipment have occurred due to corrosive action. The failures have led to environmental impacts such as spills and releases to the environment, others have led to production shut-ins with loss of revenue. All these touch the business bottom line which is costs and profits. Different oil/gas facilities in Niger-Delta were studied through site visits, observations, measurements and photographic analysis. The study established that location of the various equipment makes them susceptible to weathering effects. They experience cycles of rains, sunshine and humid ambience. Crevice, galvanic, pitting and “dry corrosion” mechanisms are dominant and, in some, result in uniform corrosion. There were cases of bacteria-related attacks on the internals of some equipment. The average metal thickness loss was established at about 12.5%. Use of more modern corrosion protection measures should be considered including increased deployment of corrosion-resistant alloys. Heavy coatings of the tank roofs under sides with anti-corrosive agents prior erection are required. Welded rather than bolted and riveted connections should be designed to minimize crevices where deep pittings are known to occur. Reinforcements with closed tubular sections are preferred to channel sections to avoid trapping of corrodents.
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