Title:
ねじ管継手用耐疲労ねじ要素
Document Type and Number:
Japanese Patent JP2004531675
Kind Code:
A
Abstract:
A fatigue-resistant threaded element for a threaded tubular connection. A portion of threads of the threaded element have a helical groove opening into the threaded crest. A groove is formed in all or a portion of the threads of one or both end zones, namely the first engaged thread zone and the last engaged thread zone, and it is optionally formed in the threads of the medial thread zone. The groove reduces stiffness of threads carrying a groove in the end zone or zones compared with the stiffness of the threads in the medial thread zone. The threaded tubular connection obtained after making up the threaded element with a mating threaded element is much more resistant to cyclic tensile stress and/or axial compressive stresses and/or flexion stresses.
Inventors:
Noel, cherry
Lucy, Gabriele
Lucy, Gabriele
Application Number:
JP2002572301A
Publication Date:
October 14, 2004
Filing Date:
March 04, 2002
Export Citation:
Assignee:
Ballorec Manesmann Oil and Gas France
SUMITOMO METAL INDUSTRIES,LTD.
SUMITOMO METAL INDUSTRIES,LTD.
International Classes:
F16B33/02; F16L15/06; F16L15/00; (IPC1-7): F16L15/00; F16B33/02
Attorney, Agent or Firm:
Yuzo Yamazaki
Naoto Sugiyama
Toshio Iwahashi
Shirogane Expo
Takako Hoshi
Toshiaki Akamatsu
Naoto Sugiyama
Toshio Iwahashi
Shirogane Expo
Takako Hoshi
Toshiaki Akamatsu