FACILITY AGAINST OVERFLOW

PURPOSE:To prevent an effect upon important equipment in the same building, upon occurrence of a large amount of water overflow due to a large-scale fracture event at a source of water leakage by providing water leakage detectors in the direction of a certain height in the building, and arranging the detectors at accessible positions. CONSTITUTION:Leakage detectors 1a and 1b are arranged in the vicinity of a pipe line 2, a pump 3 or the like for transferring a large amount of liquid in a building. When water leakage takes plate, leaking water 5 at a fractured section 4 is immediately detected with the detectors 1a on a floor 6. If a large amount of water leaks instantaneously, however, the detectors 1a may be instantaneously immersed in water and the function thereof may be lost. For this reason, the detectors 1b are laid above the detectors 1a for detecting a large amount of water leakage, and such an amount of water leakage is identified and detected with the detectors 1b, according to a vertical level difference. The detector signals are sent to an auxiliary relay panel 8 actuated with the sensing operation of a plurality of or more detectors 1b laid for preventing an erroneous system operation. An alarm signal, then, is sent from the aforesaid panel 8 to a central control panel 9. At the same time, a signal for stopping the pump 3 is automatically sent to a power supply panel 10 for supplying power to the pump 3.