An improved seal between pipes

Details An improved seal between pipes An improved seal between pipes

F - Mech Eng,Light,Heat,Weapons

16

L

F16L 15/06 (2006.01) E21B 17/02 (2006.01)

Patent

CA 2727745

A pipe joint, comprises a screw-threaded joint for pipes comprises a pin(10) having a male screw-threaded portion(15) and a box(20) having complementary screw- threaded portion(25). The threaded portions of the pin and box (10,20) inter-engage along the greater part of the axial length of the threaded portions, the male thread extending to a male stop should adjacent a complementary stop shoulder on the other portion. The pin(10) further comprises a radial surface(12) adjacent a corresponding radial surface(22) on the complementary stop shoulder of the box, a curved sealing surface(14) of the radial surface on the pin sealingly engaging a corresponding curved sealing surface(24) on the corresponding radial surface on the complementary stop shoulder. Each of the curved sealing surfaces(14,24) is so shaped to lie on an arc of a separate ellipse. The parameters of the ellipses are carefully chosen to maximise the strength and robustness of the seal.

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