| 摘要 |
PROBLEM TO BE SOLVED: To perform an improvement so that more accurate analysis becomes possible, related to existing errors at a pipeline manufacturing time, and that the errors can be discriminated easily.SOLUTION: Such a constitution is adopted that a plurality of prescribed distributions of wall thickness deviation show various actual error types which may be generated respectively at a pipeline manufacturing time, and that at least one of the plurality of prescribed distributions of wall thickness deviation shows an error type appearing only on a peripheral surface region below 180°. |
