FIELD: pipe-line transport, applicable in construction of pipe- lines. SUBSTANCE: the method consists in expansion of the inside diameter of pipe ends at the length of the thread at an angle equal to the thread slope to the diameter, whose value equals the sum of the pipe initial diameter plus two depths of the thread. EFFECT: salvaging of used up and drive pipes, simplified production operations and enhanced reliability of pipe-line protection against corrosion. 5 dwg
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