Abstract
This paper presents a failure analysis of heat exchanger tubes manufactured from aluminum bronze. The equipment operates as an intercooler after the first stage compression. The cooling medium was seawater that passed inside the tubes. The investigation involved visual inspection, chemical analysis, metallography, hardness test, scanning electron microscope analysis, and thermal-hydraulic evaluation.The aluminum content of the analyzed tube was higher than the maximum value defined by the design specification ASTM B111 C61400. The high aluminum content promoted γ2 phase formation that was preferentially attacked from the tube inner surface. The tubes failed due to dealloying (dealuminification) associated with under-deposit corrosion in regions of higher temperatures and lower seawater velocities.
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