Title:
METHOD OF TIGHTENING PIPE JOINT
Document Type and Number:
WIPO Patent Application WO/2001/086185
Kind Code:
A1
Abstract:
A method of tightening a special joint having a screwless metal sealing surface and a screwless shoulder part, comprising the steps of setting the ratio of a shoulderng torque at the time of impactive contact on the screwless shoulder part to a tightening torque at the time of completion of tightening at 1.25 to 20 and, desirably, controlling the ratio at 1.4 to 10, whereby a sufficient airtightness can be assured without being affected by the type and use condition of the pipe joint, an elastic deformation due to an excessive tightening can be prevented and, even in the present state where the environment of an oil well becomes severe, the pipe joint can be used widely for tightening the special joint used for an oil well pipe.
Inventors:
TSUJIMURA TAKUYA (JP)
Application Number:
PCT/JP2001/003881
Publication Date:
November 15, 2001
Filing Date:
May 09, 2001
Export Citation:
Assignee:
SUMITOMO METAL IND (JP)
TSUJIMURA TAKUYA (JP)
TSUJIMURA TAKUYA (JP)
International Classes:
F16L15/00; E21B17/042; (IPC1-7): F16L15/04
Foreign References:
| JPH06221475A | 1994-08-09 | |||
| JPH03157594A | 1991-07-05 | |||
| JP2000161548A | 2000-06-16 |
Other References:
See also references of EP 1281905A4
Attorney, Agent or Firm:
Mori, Michio (Higashinaniwa-cho 5-chome Amagasaki-shi, Hyogo, JP)
Hirose, Shoichi (Nihonbashi-Honcho 4-chome Chuo-ku Tokyo, JP)
Hirose, Shoichi (Nihonbashi-Honcho 4-chome Chuo-ku Tokyo, JP)
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