THREADED PIPE JOINT - OPEN JOINT-STOCK COMPANY PERVOYRALSKIY NOVOTRUBNIY ZAVOD

Title:

THREADED PIPE JOINT

Document Type and Number:

WIPO Patent Application WO/2017/034438

Kind Code:

A3

Abstract:

The invention relates to leak-tight threaded pipe joints comprising a metal-metal seal assembly. The present threaded joint for steel pipes consists of a tubular member (a nipple) and a coupling member, having situated thereon portions with an internal conical thread and with an external conical thread, wherein the nipple terminates in a tip with an axially symmetrical shape, part of the outer surface of which constitutes a sealing surface, which interacts, upon assembly of the joint, with a mating sealing surface of the coupling. Each of the sealing surfaces consists of a conical portion and a toroidal portion, wherein the toroidal portion on the nipple is situated nearer to the threaded part, and the toroidal portion on the coupling is situated further from the threaded part. In addition, the sealing surface of the nipple and also part of the non-contacting regions of the tip that are adjacent thereto are situated higher than the line of the roots of the external thread. Upon assembly of the joint, a metal-metal seal is formed which consists of three portions. The distribution of pressure in the joint provides for the necessary level of leak-tightness while maintaining high extreme-pressure properties in the region of the metal-metal seal of the threaded pipe joint. The invention increases the reliability of a threaded pipe joint under the effect of static and variable operational loads.

Inventors:

GLUKHIH NIKITA EVGENYEVICH (RU)
BARABANOV SERGEY NIKOLAEVICH (RU)
ZABOYARKIN ARTEM VLADIMIROVICH (RU)
NAKONECHNIKOV SERGEY IGOREVICH (RU)
ALEKSANDROV SERGEY VLADIMIROVICH (RU)
GOLOVIN VLADISLAV VLADIMIROVICH (RU)
MORGUNOV VASILIY ALEKSANDROVICH (RU)
FILIPPOV ANDREY GENNADYEVICH (RU)
KIRSHIN VASILIY IVANOVICH (RU)
CHERNUKHIN VLADIMIR IVANOVICH (RU)

Application Number:

PCT/RU2016/000492

Publication Date:

April 27, 2017

Filing Date:

July 27, 2016

Export Citation:

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Assignee:

OPEN JOINT-STOCK COMPANY PERVOYRALSKIY NOVOTRUBNIY ZAVOD (RU)

International Classes:

F16L15/00

Foreign References:

EA007076B1	2006-06-30
RU2310058C2	2007-11-10
RU2504710C1	2014-01-20

Other References: