FIELD: measurement technology. SUBSTANCE: invention refers to device comprising sealing bags joined by connecting link. When inflated bags form sealed chamber. Bags may not form perfect seal, leakage through them may take place if pressure differential exists. The rest of pipe forms tested volumetric chamber. One pickup measures pressure differential between chambers, another pickup measures pressure in tested chamber. Information on measured pressure differential is used by control device to monitor pressure variations and to adjust sealing pressure so that same pressures are maintained even if pressure in tested chamber drops because of rupture of pipe. An alternative system provides for two separate devices with circuits to facilitate formation of two temporarily sealed chambers placed under pressure with tested chamber located between them. EFFECT: provision for less intermittent and less expansive mechanism for precise leakage test of pipes under pressure. 2o cl, 5 dwg
