Cooper Cameron Corporation

Lan T Nguyen

Stephen John Walker

Scott D Ward

Roger David Boisjolie

An apparatus for reducing the bending stress imparted to threaded fasteners in flanged connections is disclosed. The apparatus includes a radially tapered surface machined in the backface of the flanges to coact with the head of the threaded fastener as the threaded fastener is tightened to a predetermined torque value. This coaction compensates for flange deflection as the threaded fastener is tightened.

Apparatus for reducing fastener bending stress in flanged connections

An automatic locking mechanism for a telescoping joint for a riser functions in several modes. In an operating mode, the joint is free to have its inner and outer barrels move with respect to each other without engaging each other in a locking relationship. In a second position, the telescoping joint locks when it is fully retracted. In a third position, the system locks the inner and outer barrels together to hold them in a fixed position. The inner and outer barrels are locked when a movable sleeve is properly positioned to allow spring-loaded dogs to be biased through windows in the sleeve so as to act as a landing shoulder to catch a groove on the outer barrel. By putting the actuating sleeve in a variety of positions, the various modes of the locking assembly can be deployed.

Automatic lock for telescoping joint of a riser system

An apparatus for reducing the bending stress imparted to threaded fasteners in flanged connections is disclosed. The apparatus includes a stress reducing washer positioned between the head of the threaded fastener and a counterbore in the backface of the flange. In a first embodiment, the stress reducing washer uses a tapered upper surface oriented with respect to the flange to compensate for flange deflection as the threaded fastener is tightened to a predetermined torque value. Second and third embodiments utilizing spherical and cylindrical surfaces are also shown. A fourth embodiment eliminates the need for the stress reducing washer and machines the tapered surface in the backface of the flange.

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League City, TX, United States of America

Lan T Nguyen