| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a leakage determination method of a buried pipe line having no probability that it is erroneously determined to be leakage, even in a case where a vibration source where vibration continuously occurs exists in the vicinity of the buried pipe line.SOLUTION: A leakage determination method of a buried pipe line includes a step of comparing the frequency spectrum of vibration measured for a prescribed time from a predetermined first time (daytime) in a day with the frequency spectrum of vibration measured for the prescribed time from another second time (nighttime) on the same day. For the frequency spectra at two times, in a case where one frequency spectrum corresponds to low pressure and the other frequency spectrum corresponds to high pressure, it is determined to be leakage.</p> |
