Invention Grant
- Patent Title: Screw joint for steel pipe
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Application No.: US14424158Application Date: 2013-09-11
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Publication No.: US10077612B2Publication Date: 2018-09-18
- Inventor: Yousuke Oku , Tatsuya Yamamoto , Masaaki Sugino , Russell Elder
- Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION , VALLOUREC OIL AND GAS FRANCE
- Applicant Address: JP Tokyo FR Aulnoye-Aymeries
- Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION,VALLOUREC OIL AND GAS FRANCE
- Current Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION,VALLOUREC OIL AND GAS FRANCE
- Current Assignee Address: JP Tokyo FR Aulnoye-Aymeries
- Agency: Birch, Stewart, Kolasch & Birch, LLP
- Priority: JP2012-208600 20120921
- International Application: PCT/JP2013/074562 WO 20130911
- International Announcement: WO2014/045973 WO 20140327
- Main IPC: F16L25/00
- IPC: F16L25/00 ; E21B17/042 ; F16L15/00 ; F16L15/06

Abstract:
In a screw joint for a steel pipe, a taper angle of a tapered surface of a pin is substantially the same as a taper angle of a tapered surface of a box. In addition, the pin and the box interfere with each other in a radial direction while a seal surface of the pin and a seal surface of the box contact each other in a process of make-up between a male screw portion and a female screw portion, and at least apart of the seal surface of the pin comes into close contact with at least a part of the seal surface of the box over the entire circumference. Moreover, a contact pressure amplification mechanism, which increases a contact pressure between the seal surface of the pin and the seal surface of the box at the completion of the make-up, is further provided.
Public/Granted literature
- US20150240570A1 SCREW JOINT FOR STEEL PIPE Public/Granted day:2015-08-27
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