| 摘要 |
PROBLEM TO BE SOLVED: To efficiently inspect corrosion caused by hydrogen sulfide generated in an air reservoir in a pipeline without stopping water supply and mud supply. SOLUTION: In this sewage pipeline having forced feed equipment, a drawing of a pipeline longitudinal section of the sewage pipeline is compared with a hydraulic-grade line of the sewage pipeline. The sewage pipeline forms a downward gradient. A place higher than the hydraulic-grade line in the drawing of the pipeline longitudinal section is anticipated as an air reservoir place in the sewage pipeline. In-line pressure is inspected to the anticipated place. When the air reservoir in the sewage pipeline is confirmed by the inspection, in-line corrosion is inspected on the place.
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