Fs seal for a large diameter pipe

Details Fs seal for a large diameter pipe Fs seal for a large diameter pipe

E - Fixed Constructions

21

B

E21B 33/02 (2006.01) F16J 15/02 (2006.01) F16J 15/16 (2006.01) F16L 21/02 (2006.01) F16L 21/03 (2006.01)

Patent

CA 2121178

ABSTRACT A wellhead seal assembly for sealing between a first pipe member and a second pipe member is disclosed. The first pipe member has an inside diameter and the second pipe member has an outside diameter which is smaller than the inside diameter. The pipe members are arranged such that the second pipe member is positioned, at least partly, generally concentrically within the first pipe member so that an annular gap of approximately a first distance exists between the first and second pipe members. The seal assembly comprises: an annular elastomeric body having, in cross-section, a generally rectangular shape comprising a first flat radial surface, a second flat radial surface, an inner axial surface, and an outer axial surface; each of the first and second flat radial surfaces has an inner end and an outer end; the inner axial surface comprises a generally convex portion that extends from an imaginary line connecting the inner ends of the first and second radial surfaces to a distance greater than the first distance; the outer axial surface comprises a generally concave portion extending inward from an imaginary line connecting the outer ends of the first and second radial surfaces; and at least one annular spring member in the elastomeric body positioned at the intersection of either of the radial surfaces and the inner axial surface and having a diameter of at least approximately 1.5 times the first distance.

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