Title:
SCREW JOINT FOR OIL WELL PIPING
Document Type and Number:
WIPO Patent Application WO/1999/053232
Kind Code:
A1
Abstract:
A screw joint for oil well piping excellent in sealing property, wherein a load flank $g(u)1 meets specified requirements, such a form that the inclined surfaces of a trapezoidal screw on both sides are brought into contact simultaneously when the screw joint is tightened so that an interference $g(D)d of at least 0.12 % of the outer diameter and with 0.8 % or less of the outer diameter in hoop stress is given is provided to a screw part, a clearance formed between the crest and root of the trapezoidal screw is reduced to 0.2 mm or less, and dimensional tolerances of the screw width and screw crest height meet specified requirements.
Inventors:
NISHI MASATSUGU (JP)
SUZUKI TERUAKI (JP)
SUZUKI TERUAKI (JP)
Application Number:
PCT/JP1999/001920
Publication Date:
October 21, 1999
Filing Date:
April 12, 1999
Export Citation:
Assignee:
NIPPON KOKAN KK (JP)
MITSUBISHI CORP (JP)
NISHI MASATSUGU (JP)
SUZUKI TERUAKI (JP)
MITSUBISHI CORP (JP)
NISHI MASATSUGU (JP)
SUZUKI TERUAKI (JP)
International Classes:
F16L15/04; E21B17/042; F16L15/06; F16L58/10; (IPC1-7): F16L15/04
Foreign References:
| JPH09119564A | 1997-05-06 |
Attorney, Agent or Firm:
Kobayashi, Hisao (Sasaki & Partners The 6th Central Building
6th floor 19-10, Toranomon 1-chome Minato-ku Tokyo, JP)
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