THREADED JOINT FOR STEEL PIPE - NIPPON STEEL & SUMITOMO METAL CORP

Title:

THREADED JOINT FOR STEEL PIPE

Document Type and Number:

WIPO Patent Application WO/2016/056222

Kind Code:

A1

Abstract:

This threaded joint is configured from a pin (10) and a box (20). The outer diameter of the box (20) is less than 104% of the outer diameter of the pipe body of the pin (10). The box (20) is provided with the following in this order from the tip toward the pipe body: a lip section (24) comprising a shoulder surface (22) and a seal surface (23); and a female thread section (21). The pin (10) is provided with a shoulder surface (12), a seal surface (13), and a male thread section (11). The shoulder surfaces (12, 22) are tilted in the screw-in direction of the pin (10) from a surface that is perpendicular to the pipe axis (CL). The lip section (24) of the box (20) comprises a nose section (25) arranged between the shoulder surface (22) and the seal surface (23) and an annular section (26) arranged between the seal surface (23) and the female thread section (21). Neither the nose section (25) nor the annular section (26) is in contact with the pin (10). The length of the annular section (26) is longer than the thread pitch of the female thread section (21).

Inventors:

SUGINO MASAAKI (JP)
NISHIKAWA YUKIHIRO (JP)

Application Number:

PCT/JP2015/005063

Publication Date:

April 14, 2016

Filing Date:

October 05, 2015

Export Citation:

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Assignee:

NIPPON STEEL & SUMITOMO METAL CORP (JP)
VALLOUREC OIL & GAS FRANCE (FR)

International Classes:

F16L15/04; E21B17/03; E21B17/042

Foreign References:

JP2010520981A	2010-06-17
JP2013511672A	2013-04-04
JP2004504563A	2004-02-12
JP2009505003A	2009-02-05
JP2013536339A	2013-09-19
JP2014105761A	2014-06-09
US20100181763A1	2010-07-22
EP2325435A1	2011-05-25

Other References: