To provide an operation control system for a plurality of sewage tanks preventing the overflowing of sewage water from the sewage tanks in case of emergency such as trouble of drainage pumps and enabling drain piping to be installed in a narrow area by forming a single force-feed pipe for drainage water into a requisite minimum fine pipe.

The operation control system has the single force-feed pipe 14 for the drainage water connected with a main pipe 17, an overflow communication pipe 13 communicating with the plurality of the sewage tanks 1-8, automatic switching valves 15 arranged at merging positions which communicate discharge pipes 10 of the drainage pumps 9 set in the respective sewage tanks with the single force-feed pipe 14 for the drainage water, a main control device 20 controlling the order of operations of the respective sewage tanks, and subcontrol devices 21-28 separately controlling the drainage pumps 9 of the respective sewage tanks and the automatic switching valves 15. The drainage pumps 9 to which operation allowing signals are imparted from the main control device 20 carry out control action to occupy the force-feed pipe 14 for the drainage water.

COPYRIGHT: (C)2006,JPO&NCIPI