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Title:
THREADED COUPLING FOR STEEL PIPING
Document Type and Number:
WIPO Patent Application WO/2018/211873
Kind Code:
A1
Abstract:
A threaded coupling comprises a pin (10) and a box (20). The pin (10), in order from the distal-end side of the pin (10) toward the pipe-body side, is provided with an inner seal surface (11), an inner male threaded part (12), a shoulder part (13), an outer male threaded part (14), and an outer seal surface (15). The box (20), in order from the pipe-body side of the box (20) toward the distal-end side, is provided with an inner seal surface (21), an inner female threaded part (22), a shoulder part (23), an outer female threaded part (24), and an outer seal surface (25). An inner groove part (16) extending along the circumferential direction is provided between the inner seal surface (21) and the inner female threaded part (22) of the box (20), and some teeth of the inner male threaded part (12) of the pin (10) are accommodated in the inner groove part (16). It is thereby possible to ensure stable sealing performance with respect to internal pressure, external pressure, tensile loads, and compression loads.

Inventors:
MARUTA, Satoshi (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
OKU, Yousuke (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
NAKAMURA,Tadashi (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
Application Number:
JP2018/015263
Publication Date:
November 22, 2018
Filing Date:
April 11, 2018
Export Citation:
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Assignee:
NIPPON STEEL & SUMITOMO METAL CORPORATION (6-1 Marunouchi 2-chome, Chiyoda-ku Tokyo, 71, 〒1008071, JP)
VALLOUREC OIL AND GAS FRANCE (54 rue Anatole France, AULNOYE-AYMERIES, 59620, FR)
International Classes:
F16L15/04
Domestic Patent References:
WO2009044851A12009-04-09
Foreign References:
JP2000240862A2000-09-08
JP2006526747A2006-11-24
JP2011501075A2011-01-06
JP2010531418A2010-09-24
JPH09126366A1997-05-13
Attorney, Agent or Firm:
ASCEND IP LAW FIRM (5-17, Dojima 1-chome Kita-ku, Osaka-sh, Osaka 03, 〒5300003, JP)
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