Threaded joint with improved resilient seal ring
AssigneeTenaris Connections Limited
InventorsNestor J. Santi, Gaston Mazzaferro, Alfredo Francisco Quiroga
Life of this patent
Estimating the term…
Abstract
A threaded joint includes a first seal ring having a tapered shape in a cross section on an axial plane, this ring having an L-shaped metal reinforcement ring embedded in it. The threaded joint can also include a second seal ring positioned more internal to the first seal ring and located in a housing between the end of a threaded section and the nose of the box. The second seal ring has a first base, a second base axially opposite to the first base, and protruding annular ribs either on the external surface or on an internal surface.
Claims20
A threaded joint comprising:
- a male threaded pin, a female threaded box, the pin being configured to be made up in the box, pin and box defining a common longitudinal axis;
- a first seal ring and a separate second seal ring interposed between the pin and the box, and located in a portion of the surface of the box between the end of a threaded portion of the box and a nose of the box, and wherein when the pin and box are made up each of the first and second seal rings are in tight sealing contact with the pin and the box by a respective radially external surface on one side with an internal surface of the box and a respective radially internal surface with an external surface of the pin;
- and
- the internal surface of the box being provided with a first recess made in proximity to the nose of the box for housing the first seal ring and with a second recess made within its thickness for housing the second seal ring positioned between the first recess and the threaded portion of the box, the first recess being spaced apart along the longitudinal axis from the second recess.
A threaded joint comprising:
- a male threaded pin, a female threaded box, the pin being configured to be made up in the box, pin and box defining a common longitudinal axis;
- a first seal ring and a separate second seal ring interposed between the pin and the box, and located in a portion of the surface of the box between the end of a threaded portion of the box and a nose of the box, and wherein when the pin and box are made up each of the first and second seal rings are in tight sealing contact with the pin and the box by a respective radially external surface on one side with an internal surface of the box and a respective radially internal surface with an external surface of the pin;
- wherein the internal surface of the second seal ring comprises, when in an unloaded position, two frustoconical annular surfaces tapering towards the center of said second seal ring and joined by a fillet;
- and
- the internal surface of the box being provided with a first recess made in proximity to the nose of the box for housing the first seal ring and with a second recess made within its thickness for housing the second seal ring positioned between the first recess and the threaded portion of the box.
Dependencies are inferred from the claim text.