Title:
THREADED JOINT FOR STEEL PIPES
Document Type and Number:
WIPO Patent Application WO/2017/145192
Kind Code:
A1
Abstract:
A threaded joint is constituted by a pin (10) and a box (20). The pin (10) comprises a first male thread section (11), a first seal surface (12), a shoulder surface (13), a second seal surface (14), and a second male thread section (15), which are arranged sequentially from the front end of the pin (10) toward a pipe body. The box (20) comprises a first female thread section (21), a first seal surface (22), a shoulder surface (23), a second seal surface (24), and a second female thread section (25). The distance (L1) from the boundary (P1) between the first seal surfaces (12, 22) to the position (P3) of the shoulder surfaces (13, 23) and the distance (L2) from the boundary (P2) between the second seal surfaces (14, 24) to the position (P3) are both 15 mm or greater, and the sum (L) of the distance (L1) and the distance (L2) is 50 mm or greater. As a result of this configuration, the threaded joint can exhibit high sealing performance.
Inventors:
OKU YOUSUKE (JP)
SUGINO MASAAKI (JP)
OTA FUMIO (JP)
SUGINO MASAAKI (JP)
OTA FUMIO (JP)
Application Number:
PCT/JP2016/000963
Publication Date:
August 31, 2017
Filing Date:
February 23, 2016
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
VALLOUREC OIL & GAS FRANCE (FR)
VALLOUREC OIL & GAS FRANCE (FR)
International Classes:
F16L15/04
Domestic Patent References:
WO2014045973A1 | 2014-03-27 |
Foreign References:
JP2013536339A | 2013-09-19 | |||
JPS60500457A | 1985-04-04 | |||
US7690696B2 | 2010-04-06 | |||
US20060145480A1 | 2006-07-06 |
Other References:
See also references of EP 3421855A4
Attorney, Agent or Firm:
ASCEND IP LAW FIRM (JP)
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