METHOD AND EQUIPMENT FOR DETECTING SEAL DEFECTS IN SEWAGE AND VENTILATION SYSTEMS OF BUILDINGS Russian patent published in 2012 - IPC G01M3/26 E03C1/22 

FIELD: physics.

SUBSTANCE: low-amplitude air pressure pulse is transmitted into the sewage and ventilation system of a building so that the pressure wave passes through the connecting pipe into the riser pipe and sewage network. Passage of said pulse is picked up with an air pressure sensor lying near the connecting pipe or origin of the pulse. Pressure of pulses successively reflected from each drain pipe of the sewage network is measured. Signatures of pressure variation with time are formed and these signals are transmitted to a central data collection system. The pressure pulse moves through the network at the speed of sound and is reflected from each end of the pipe into the network, owing to which the characteristic reflection coefficient for each end of the pipe can be determined. This reflection coefficient is compared with test results obtained beforehand for an ideal network without dry gully traps or leakages, and in case of difference with the recorded pressure signature, based on the point of deviation, which corresponds to the moment in time when the reflected pulse arrives at the pressure sensor from the changed end of the pipe, that time is determined, and since the speed of the wave is known, the distance from the sensor to the faulty gully trap is determined.

EFFECT: easier detection and identification damages in sewage and ventilation systems of buildings.

11 cl, 7 dwg