The invention discloses a small leakage detection
system for a liquid pipeline and relates to the technical fields of tests not included in other classes,
acoustic wave measurement and pipeline systems. On the premise of not changing technological processes of current pipelines, a leakage detection ball is sent out by a
pipe cleaner ball sending device and flows along with a medium in the pipeline; meanwhile, acoustic signals inside the pipeline and state information of the leakage detection ball are acquired, stored and tagged with time labels; after the leakage detection ball is collected back from a ball collecting bucket, the small leakage detection
system is connected with an upper computer, so that the acoustic information stored in the pipeline and the state information of the leakage detection ball are obtained; the obtained acoustic information is directly displayed in an oscillograph on the upper computer; except a ball sending bucket and the ball collecting bucket, if an acoustic amplitude is higher than that of
noise in the pipeline, the corresponding time is judged to be the leakage point and recorded; according to the recorded time of the leakage point, the state information of the leakage detection ball is subjected to
quadratic integral so as to obtain displacement of the leakage detection ball relative to the ball sending bucket, namely the leakage position. The small leakage detection
system for the liquid pipeline can detect small and even tiny leakages and is high in sensitivity.