Patent ID: 8733447

Claim:
A system for use with a landing string disposed within a riser located below a floating vessel, wherein the riser includes a telescopic joint, and a riser compensation system is used to compensate for the effect of vessel heave upon the riser, the system comprising: a slip joint member attachable to a mandrel, wherein the mandrel is attached to a top end of the landing string, the slip joint member includes an upper portion and a lower portion; a first lock assembly configured to connect the upper portion of the slip joint member to the floating vessel; and a second lock assembly configured to connect the lower portion of the slip joint member to the riser disposed below the floating vessel, wherein the second lock assembly includes outwardly-actuatable locking members configured to engage a profile in the riser when outwardly actuated and inwardly-actuatable locking members that engage profiles on the mandrel when inwardly actuated, wherein the outwardly-actuatable locking members are movable axially along the mandrel, and wherein the riser compensation system which compensates for the effect of vessel heave upon the riser is also used to compensate for the effect of vessel heave upon the landing string.