PROBLEM TO BE SOLVED: To provide an oil-water separation tank being used in an oil-water separation facility unidirectionally arranged to the oil-water separation tank, capable of preventing water leakage between oil-water separation tanks and being easily unidirectionally arranged with the separation tank.;SOLUTION: An oil-water separation tank 1 is used in an oil-water separation facility unidirectionally arranged with two oil-water separation tanks and provided with an upstream side separation chamber 20a, a downstream side separation chamber 20b, a side wall opening 26b in the downstream side separation chamber and a separation tank connecting pipe 3 attached to the opening 26b. The separation tank connecting pipe comprises: a tubular projection 32 approachable from the side wall opening 26a of a connected second oil-water separation tank 1b; a first abutting part 34 contactable with the inside wall of the oil-water separation tank 1 in a liquid-tight state; a second abutting part 35 contactable with the inside wall of the second oil-water separation tank and the outside surface of the tubular projection in a liquid-tight state; and a fixing member 7 fixing the second abutting part to the inside wall of the second oil-water separation tank in a pressing state. Th fixing member and the second abutting part are detachable to the tubular projection.;SELECTED DRAWING: Figure 17;COPYRIGHT: (C)2019,JPO&INPIT
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