FIELD: transportation of liquids; oil transporting pipe lines. SUBSTANCE: pipe line consists of two tubes mounted concentrically and divided by means of linear gates; inter-tube space near linear gates is blanked off and is brought in communication with cavity of internal tube by means of two branch pipes. Each branch pipe is provided with gate and throttle valve; external tube is provided with at least two branches between linear gates. EFFECT: reliable protection of pipe lines against leaks. 1 dwg
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