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US 4,253,687 AGranted
Pipe connection
AssigneeWhiting Oilfield Rental, Inc.
InventorJohn H. Maples
Life of this patent
Estimating the term…
Abstract
Pipe connection comprising "Hydril" type pin and box connectors with an annular groove formed in the pin connector at the juncture of the inner cylindrical land and the inner tapered seating surface and a seal ring of preferably circular cross section, e.g. an O-ring, disposed in the groove sealing between the pin connector and the box connector.
Claims2
Pipe connection comprising
- a tubular pin having on its exterior progressing from its distal end to its proximal end an external tapered seating surface adjacent said distal end, an annular groove adjacent said tapered external seating surface, a cylindrical external land adjacent to said external tapered seating surface, a first straight external thread adjacent to said cylindrical external land, a second straight external thread of larger diameter than said first straight external thread adjacent said first straight external thread, and a stop shoulder beyond said second external straight thread,
- a tubular box having on its interior progressing from its bottom to its mouth a tapered internal seating surface adjacent the bottom of the box, a cylindrical internal land adjacent to said tapered internal seating surface, a first straight internal thread adjacent to said cylindrical internal land, a second straight internal thread of larger diameter than said first straight internal thread adjacent said first straight internal thread, and an annular stop surface beyond said second straight external thread,
- the aforementioned parts of said pin being correlative to those of the box whereby the pin and box can be screwed together with said tapered sealing surfaces in engagement and said cylindrical lands opposite each other, and
- a seal-ring disposed in said groove sealing between said pin and said internal tapered seating surface of said box when said pin and box are made up together, said seal ring lying between the area of metal to metal engagement of said seating surfaces and the area of proximity of said cylindrical lands,
- said groove having a maximum depth less than the unstressed thickness of the seal ring, the cross-sectional area of the groove being less than the cross-sectional area of the seal ring, and when the connection is fully made up there being clearance between said cylindrical lands, said seal ring entirely filling the groove and extruding from the volume between said groove and said internal tapered seating surface into said clearance between said cylindrical lands adjacent thereto.
2 more elements
Dependencies are inferred from the claim text.