PROBLEM TO BE SOLVED: To surely judge the kinds of oil in a lorry and an oil storage tank without increasing the unloading time, and to cope with oil feed into the oil storage tank located at the distance not less than the length of an oil feed hose. ;SOLUTION: Even when the oil is unloaded using two oil feed hoses 15, 45, the hoses 15, 45 can be connected so that discrimination piece reading means 22, 47 are located on the side of an oil feed pipe 17 through first and second connection pieces 50, 60 capable of being connected to a discharge port, and the oil feed hoses 15,45. Thus, a discrimination piece 21 to indicate the kind of oil in each oil storage tank can be inserted in the discrimination piece reading means 22, 47. The data on the oil kind are received, and the data are compared with the data on the oil kind for a hatch designated by the key board, and a bottom valve can be opened only when these data agree with each other.;COPYRIGHT: (C)1997,JPO
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