Importance

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Abstract

Disclosed is a circle thread form for threadably engaging the wellhead valve assembly and the riser tensioner to the riser top joint of a marine riser of a floating tension leg platform or similar drilling or production platform. The male thread form is located on the cylindrically shaped riser pipe, wherein the male thread form comprises a series of annular substantially circularly shaped convex protrusions that are substantially equally spaced from one another and extend outwardly from a predetermined pitch line, and between and abutting each of the protrusions a series of annular and substantially circularly shaped concave grooves that extend inwardly from said pitch line. The female thread forms are located on the wellhead valve assembly and the riser tensioner, and comprise a second series of protrusions and grooves, said second grooves shaped complimentary to the pipe protrusions, and the second protrusions shaped to engage the riser pipe grooves no further than about 3/4 of the depth into the riser pipe grooves.

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First Claim