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Patent Searching and Data


Title:
THREADED COUPLING FOR STEEL PIPE
Document Type and Number:
WIPO Patent Application WO/2015/033997
Kind Code:
A1
Abstract:
This threaded coupling for steel pipes comprises: a box being an opening end of a second pipe material; and a circular truncated cone-shaped pin being one end of a first pipe material and into which the box is inserted. The pin has a male screw section being a tapered screw and a seal section including a tapered surface. The box has a female screw section being a tapered screw and a seal section including a tapered surface. In the state prior to starting coupling of the pin and the box, the minimum diameter of the tapered surface of the pin is smaller than the maximum diameter of the tapered surface of the box.

Inventors:
SUGINO MASAAKI (JP)
YAMAMOTO TATSUYA (JP)
NISHIKAWA YUKIHIRO (JP)
Application Number:
PCT/JP2014/073318
Publication Date:
March 12, 2015
Filing Date:
September 04, 2014
Export Citation:
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Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
VALLOUREC OIL & GAS FRANCE (FR)
International Classes:
F16L15/04
Domestic Patent References:
WO2011060894A22011-05-26
Foreign References:
JPH08135855A1996-05-31
JP2012241863A2012-12-10
JP2007205361A2007-08-16
JP2005351324A2005-12-22
JP2002527696A2002-08-27
JP2012149760A2012-08-09
JP2013511672A2013-04-04
JP2012506000A2012-03-08
JP2012149760A2012-08-09
JP2012506000A2012-03-08
Other References:
See also references of EP 3043098A4
Attorney, Agent or Firm:
SHIGA Masatake et al. (JP)
Masatake Shiga (JP)
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