ANALISIS MUTU AIR DENGAN PENDEKATAN SIX SIGMA UNTUK PENINGKATAN MUTU PLAT BAJA

Abstract

Nowadays, steel needs in the industrial and housing sectors are the most fundamental needs. Steel is used as raw material in manufacturing and construction processes so that good quality steel is required. In the production process to produce good quality steel there are still some problems that arise one cause of the quality of steel due to water quality degradation. Six sigma method is used for water quality control and seven tools method is used to analyze the factors causing water quality decrease. Several factors affect water quality factors such as pH, Cl, Turbidity, SS, Fe, m-Al, Ca-H, PO4. After the data is analyzed it is known that turbidity can cause the carrying of iron particles from the water so that will cause defects on the surface of the plate. Other quality factors such as pH have an impact on the level of engine corrosivity and steel piping. The more acidic or alkaline a solution the higher the corrosive level. Based on testing of water samples obtained turbidity parameter data experienced the largest deviation compared with other parameters so that handling on this parameter should be prioritized. The greater the value of turbidity, the greater the potential carrying iron crust particles that resulted in the buildup and blockage of the pipe. Based on analysis of quality control using six sigma obtained RPN value of dirty water supply equal to 579, RPN turbidity value 512, RPN pH value equal to 448, RPN Fe value 392 and RPN value Filter tool / filter water does not filter optimally equal to 336.