FIELD: methods of reliable detection of leakage from pipe lines enclosed in hollow envelopes and cases. SUBSTANCE: method consists in check of gas in air blown through passage between pipe line under test and its envelope by means of detector mounted at the end of section under test; as soon as leakage has been revealed by detector, blowing is discontinued for forming gaseous nucleus of increased concentration after which blowing is started again and time from moment of starting the procedure till moment of detection of gaseous nucleus of increased concentration is noted; knowing this time and rate of blowing, distance from detector and leaky point and moment of beginning of leakage are determined. EFFECT: enhanced sensitivity and prompt detection of leakage. 1 dwg
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