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We have become a dominant player in the market of offering Negative Pressure Wave Based Pipeline LDS. It is a statistical tightness monitoring system used to test for leaks in hydrants. The system uses sequential probability ratio test to detect changes in the overall pressure. It analyzes the pressure variation over a high pressure and then a lower pressure to confirm the tightness of a test section. The system does not require temperature sensors for leak confirmation. Negative Pressure Wave Based Pipeline LDS is widely used in liquid pipelines, monitoring approximately 200 pipelines many of which transport jet fuel over distances from as small as 100 meters to a few kilometres.