Laser method for detecting leakage from petroleum pipelines

Now-existing systems for leakage monitoring at petroleum pipelines provide the registration of large leakages and have a sensitivity limit of around 1% of the pipeline performance. A problem is discussed concerning the remote detection of low intensity (less than 1 %) leakages from pipelines. One of variants of the system for remote pipeline-leakage detection is the system of oil pollution monitoring over the earth's surface along the petroleum pipeline track. The fluorescence spectra of pure petroleum products (crude oil, light and heavy oil products), different ground surfaces (soil, vegetation, water, and asphalt), and oil products spilled over different earth's surfaces are given, which were obtained experimentally for the excitation wavelength of 266 nm. It is shown that the use of the laser method based on registration of fluorescence emission in three narrow spectral regions enables the oil pollutions to be revealed on the earth's surface with a probability of correct detection close to unity at a small probability of false alarms.

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