FIELD: tight connection of metal pipes used in production of oil and forming of oil well casings. SUBSTANCE: system includes coupling 10 provided with two threaded holes for screwing the embraced ends of two pipes. Front walls of these pipes rest against each other inside coupling 10. Convex circular taper zone located near front wall of each pipe tightly rests against concave circular taper zone of coupling 10; locking beads ensure centering of each member embracing the pipes in longitudinal plane. EFFECT: enhanced reliability. 19 cl, 6 dwg
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