tensioner for maintaining tensile strength in a riser and method for tensioning a riser passing through an opening in a deck of a platform

摘要

"Tensioner for maintaining tensile force in a riser and method for tensioning a riser passing through an opening in a deck of a platform" An impulse tensioner (11) for maintaining a tensile force in a riser (13) having a geometry axis (39) that engages a floating platform and maintains tensile force while riser (13) tilts variably from the vertical. tensioner (11) includes a plurality of rollers (35) having a lower end pivotally coupled to deck 10 (17). the cylinders (35) are substantially perpendicular to the deck (17) in the operating position and at an angle to the deck (17) in the tensioning position. after riser operation (13), a locating assembly (51) moves the cylinders (35) from the operating position to the tensioning position. a tensioning ring (21) operates on riser (13) 15 near an upper end of the cylinders (35), and the cylinders (35) are then automatically coupled to the tensioning ring (21).