| 摘要 |
PROBLEM TO BE SOLVED: To make it unnecessary to obtain the data related to the corrosion depth of a pipe body at each time, each time the corrosion quantity of the pipe body embedded in the ground is estimated. SOLUTION: The corrosion depth of a cast iron pipe embedded in the ground is represented byηkt<SP>α</SP>[whereηis the corrosion depth, t is embedding period and k andαare constants], and the constant k is represented by k=exp (β<SB>0</SB>+C1+C2+C3+C4+C5+C6) [whereβ<SB>0</SB>is a constant and C1-C6 is the quality of soil, the kind of the ground, the specific resistance of soil, the pH of soil, the oxidation-reduction potential of soil and the coefficient, based on the presence of the detection of a sulfide in soil]. A large number of investigation samples are formed from the measured values of the corrosion depths of the respective cast iron pipes embedded in a large number of areas and the analyzed results of soils around the pipes to preliminarily determine the constantβ<SB>0</SB>and the coefficients C1-C6, and the corrosion depth of the pipe embedded in a specific area is estimated, based on the data related to the soil in which the pipe is embedded and on the embedding period of the pipe. COPYRIGHT: (C)2006,JPO&NCIPI
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