THREADED JOINT FOR STEEL PIPES Russian patent published in 2022 - IPC F16L15/04 

FIELD: pipes joint.

SUBSTANCE: invention relates to a threaded joint for steel pipes in which surface damage does not easily occur on any of the internal or external threads. Threaded connection for steel pipes 1 includes a nipple 10 and a coupling 20. The nipple 10 includes: a bow 12; tapering internal external thread 14; tapering external thread 17; inner sealing surface 13 of the nipple; the surface 18 of the intermediate shoulder of the nipple and the intermediate sealing surface 16 of the nipple. The coupling 20 includes: a tapering female internal thread 24; tapering external internal thread 27; the inner sealing surface 23 of the clutch; the surface 28 of the intermediate shoulder of the coupling; intermediate sealing surface 26 of the coupling. Each of the internal external thread 14, external thread 17, internal thread 24 and external internal thread 27 includes a section 141, 171, 241, 271 full profile threads. Each full length thread includes an inner end located relatively close to the tip of the pin 10 and an outer end located relatively close to the opposite end of the pin 10. Threaded connection for steel pipes 1 satisfies mathematical expressions.

EFFECT: improvement of threaded joint for steel pipes.

4 cl, 6 dwg, 2 tbl