Threaded joint for steel pipes

Details Threaded joint for steel pipes Threaded joint for steel pipes

2010-03-29

2011-10-18

Bochna, David E (Department: 3679)

Pipe joints or couplings

Particular interface

Tapered

Reexamination Certificate

active

08038179

ABSTRACT:
A threaded joint for steel pipes comprising a pin1having a tapered male thread11, a tapered sealing surface13, and an end shoulder surface14and a box2having correspondingly a tapered female thread21, a tapered sealing surface23, and a shoulder surface24which is capable of easy tightening and has improved air tightness by the sealing surfaces is arranged such that the pin and the box each have a noncontacting region B where the peripheral surfaces of the pin and the box do not contact each other between the sealing surfaces13, 23and the shoulder surfaces14and24. At least a portion of the noncontacting region of the pin adjoining the to end of the pin is a tapered surface portion18having substantially the same angle of slope as the tapered sealing surface13, and the noncontacting region of the box is a substantially cylindrical surface.

REFERENCES:
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patent: 2002-507685 (2002-03-01), None
patent: 2006-526747 (2006-11-01), None
patent: 2004/109173 (2004-12-01), None

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