Analisis Korosi pada Filter Feed Pump Studi Kasus pada Waste Water Treatment Plant

Abstract

Centrifugal pumps are the most widely used equipment in the industry, so it is essential to study the corrosion of pump components. Material degradation through corrosion is sure to happen quickly and slowly. This study aims to determine the most significant factor causing corrosion and the types of corrosion in the filter feed pump installed in the wastewater treatment plant. Identification of failures is made by conducting visual inspections and literature studies regarding the plant operation, inspection, repair, and replacement data. From these data, an analysis of the aggressiveness of fresh water, an analysis of the operation and maintenance of the causes of corrosion failure on pump components, and the type of corrosion that occurred on pump components are carried out. In addition, analyses are also carried out regarding the possible combination of causes of corrosion failure between redox reactions and loading, which causes stress corrosion cracking and fatigue corrosion. Based on the studies, it was found that the operation, maintenance, and environmental factors cause the corrosion that occurs. Lack of maintenance is the most dominant fault as factor causing corrosion. Not doing predictive maintenance causes tremendous damage to the pump casing cover. The oxygen difference factor also causes failure of the casing, wear ring eye, bearing bracket, and shaft. The results of identifying the types of corrosion that occur in the filter feed pump components include uniform corrosion, pitting corrosion, crevice corrosion, stress corrosion cracking (SCC), fatigue corrosion, erosion-corrosion, and cavitation corrosion.