Title:
THREADED FITTING FOR STEEL PIPES
Document Type and Number:
WIPO Patent Application WO/2017/069030
Kind Code:
A1
Abstract:
Provided is a threaded fitting for steel pipes, which is capable of improving sealing performance. This threaded fitting (1) for steel pipes is configured from a pin (10) and a box (20). The outer diameter of the box (20) is smaller than 108% of the outer diameter of a steel pipe body (30). The pin (10) is provided with: a pin lip section (12) including a first sealing surface (11); a male threaded section (13) formed as a single-stage tapered screw; and a second sealing surface (14). The box (20) is provided with: a first sealing surface (21); a female threaded section (23) formed as a single-stage tapered screw; and a box lip section (22) including a second sealing surface (24). In a fastened state, the first sealing surfaces (11, 21) come into contact with each other, and the second sealing surfaces (14, 24) come into contact with each other. The male threaded section (13) has a plurality of thread valley bottom surfaces that are parallel to the pipe axis (CL) and have the same diameter at an end portion on the pin lip section (12) side. The female threaded section (23) has a plurality of thread valley bottom surfaces that are parallel to the pipe axis (CL) and have the same diameter at an end portion on the box lip section (22) side.
More Like This:
| JPH09217871 | CONNECTION STRUCTURE FOR PIPING MEMBER |
| WO/2004/003416 | REINFORCED TUBULAR THREADED JOINT FOR IMPROVED SEALING AFTER PLASTIC EXPANSION |
| WO/2000/068606 | FLEXIBLE TUBE COUPLING FITTING |
Inventors:
SUGINO MASAAKI (JP)
DOUCHI SADAO (JP)
YAMAMOTO YASUHIRO (JP)
DOUCHI SADAO (JP)
YAMAMOTO YASUHIRO (JP)
Application Number:
PCT/JP2016/080321
Publication Date:
April 27, 2017
Filing Date:
October 13, 2016
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
VALLOUREC OIL & GAS FRANCE (FR)
VALLOUREC OIL & GAS FRANCE (FR)
International Classes:
F16L15/04; E21B17/042
Domestic Patent References:
| WO2009044851A1 | 2009-04-09 |
Foreign References:
| JP2009531603A | 2009-09-03 | |||
| JPH0280886A | 1990-03-20 | |||
| JPS6347588A | 1988-02-29 | |||
| JP2012030349A | 2012-02-16 | |||
| JP2002524712A | 2002-08-06 | |||
| JP2013507588A | 2013-03-04 | |||
| JPH1113728A | 1999-01-22 |
Other References:
See also references of EP 3366968A4
Attorney, Agent or Firm:
UEBA, Hidetoshi et al. (JP)
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