Title:
THREADED COUPLING FOR STEEL PIPE
Document Type and Number:
WIPO Patent Application WO/2020/075366
Kind Code:
A1
Abstract:
Provided is a threaded coupling for a steel pipe with which high torque performance, high tension performance, and high sealing performance can be exhibitied. A threaded coupling 1 is provided with: a tubular pin 10 including a pin shoulder 12, a male thread 11, and a pin seal 13; and a tubular box 20 including a box shoulder 22, a female thread 21, and a box seal 23. The male thread 11 and the female thread 21 are configured from sphenic threads. The pin seal 13 is provided between the pin shoulder 12 and the male thread 11. The box seal 23 corresponds to the pin seal 13 and is provided to the inner peripheral surface of the box 20. In a fastened state, the pin shoulder 12 is separated from the box shoulder 22. The threaded coupling 1 satisfies formula (1). In formula (1), LP is the pitch between load surfaces 111 of the male thread 11, and SP is the pitch between insertion surfaces 112 of the male thread 11. 3% ≤ (LP − SP) / LP ≤ 7% (1)
Inventors:
OKU YOUSUKE (JP)
DOUCHI SADAO (JP)
DOUCHI SADAO (JP)
Application Number:
PCT/JP2019/028959
Publication Date:
April 16, 2020
Filing Date:
July 24, 2019
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
VALLOUREC OIL & GAS FRANCE (FR)
VALLOUREC OIL & GAS FRANCE (FR)
International Classes:
F16L15/04; E21B17/042; F16L15/06
Domestic Patent References:
| WO2015194193A1 | 2015-12-23 | |||
| WO2015194193A1 | 2015-12-23 |
Foreign References:
| JP2015534614A | 2015-12-03 | |||
| JP2012512347A | 2012-05-31 | |||
| JP2005523404A | 2005-08-04 | |||
| US0030647A | 1860-11-13 | |||
| US6158785A | 2000-12-12 | |||
| JP2012512347A | 2012-05-31 |
Other References:
See also references of EP 3865753A4
Attorney, Agent or Firm:
UEBA, Hidetoshi (JP)
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