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The purpose of this study was to investigate the peeling percent, EIS, and neutralization degree of the inner lining and outer coating materials used to protect large diameter steel pipe or cast iron pipe from corrosion. And the service life of the inner lining and outer coating materials were predicted. The results are as follows. First, the peeling percent of the coal-tar enamel lining was estimated to be more than 10% after the age of 15 years or 19 years. And the electro impedance spectroscopy(EIS) was predicted that it reduced under 6 log (/Z/ohm) after 22 years, so that the protection of the pipe surface from corrosion would be lost. On the other hands, the EIS of outer coal-tar enamel coatings was predicted after about 28 years. Second, the epoxy resin lining is expected to have a slightly longer service life compared to inner coal-tar enamel lining, although the years of aging are close to 20 years. The EIS was predicted to be reached at 6 log (/Z/ohm) after at least 60 years. However the relationship coefficient of prediction function was low as 0.11. Third, the cement mortar lining used in ductile iron casting pipe was predicted to lose the function of CML after 40 years at under 450 mm diameter and at least after 60 years over 500 mm diameter.
S multi-regional water supply system is a large-scale water supply facility with a capacity of 8.5 million m<sup>3</sup>/day, which is responsible for supplying clean and safe tap water to all consumers of the metropolitan area. Since the direct or indirect impact of a single pipeline accident is serious in the large-scale pipeline with a diameter of more than 2,000 mm, continuous and systematic management is necessary. In this study, some sections of the S2 bulk water supply pipelines with an age of more than 38 years, which were expected to be seriously deteriorated, were selected for diagnosis spot. In-line inspection with MFL(Magnetic Flux Leakage) sensors was applied in the field. Through the application of MFL, it was possible to accurately pinpoint vulnerable sections, which were difficult to distinguish by direct investigation of manpower. In addition, we could derive necessary items for efficient large-diameter MFL diagnosis and verified the reliability of MFL diagnosis method through a comparison of MFL diagnosis results and UT-test results. Currently, MFL has limitation to implement in severe ovality and it is expensive foreign high-tech equipment. If we can localize MFL technology and the reliability of this technique is gradually secured, MFL will play a very important role in decision-making process of pipeline rehabilitation in the future