SWIVEL PIPE COUPLING Russian patent published in 1999 - IPC

FIELD: oil and gas industry. SUBSTANCE: proposed coupling is used for power contact and functional connection of two cylindrical bodies of tubular form; coupling includes parts in form of elbow, one of which is used as holder for other elbow. Interconnection of elbows by means of thread makes it possible for pipes connected to elbows to turn in longitudinal plane around axis of symmetry. Strength of connection of parts between each other and with pipes is ensured by thread on contact surfaces. Tightness of pipe joints is ensured with the aid of clamping bushes with flexible gaskets pressed to end faces of coupling and to end slit of threaded joint. Use may be made of respective grease for threaded surfaces to reduce force in turning the members and to avoid leakage of liquid or gas from pipe line at joint area. EFFECT: enhanced efficiency and reliability. 3 cl, 7 dwg