lifting device of a drilling riser, and mounting of drilling riser

摘要

lifting device of a drilling riser, and mounting of drilling riser lifting devices for use with drilling risers, wherein the lifting devices have a plurality of segments, some of which are pivoted for ease of handling and provide multiple shear points between the articulated segments. One embodiment comprises a lifting device for a piercing riser, wherein the device includes a collar and a lifting handle. The collar has a cylindrical ring with one or two annular ribs connected to corresponding circular edges of the ring. The lifting strap is attached to the collar and ribs. the collar has a plurality of segments, and at least one first of the segments is pivotally connected to another of the segments by a hinge. each rib may taper smoothly from a thinner thickness to an upper rib edge to a larger thickness at a rib base. 1/1