DREDGING CONTROL DEVICE OF CARGO OIL TANK

摘要

PROBLEM TO BE SOLVED: To provide a dredging control device of a cargo oil tank in which the dredging work is automatic and efficient, and a sensor is of simple constitution. ;SOLUTION: A dredging control device is provided with a main bell mouth 2 connected to a suction tube 3 having a main valve 4, a sub bell mouth 5 connected to a suction pipe 6 which is installed in a recess 9 of a cargo oil tank 1 and has a dredging valve 7, an upper dredging starting point sensor B to detect the cargo oil level which is the dredging preparation starting point, a lower dredging starting sensor A which is installed lower than the sensor B and detects the cargo oil level which is the dredging starting point, and a control part which receives the signal from the sensor A, B and transmits the signal to control the operation of a pump 8 connected to opening/closing and suction pipes 3, 6 of the main valve 4 and the dredging valve 7. The control part gradually closes the main valve 4, and opens the valve 7 through the detection of the cargo oil level by the upper dredging starting point sensor B, and starts the pump through the detection of the cargo oil level by the lower dredging starting point sensor A, sucks the dredged oil by the sub bell mouth 5, and the dredging and suction operation is intermittently repeated several times.;COPYRIGHT: (C)1997,JPO