Patent ID: 7708498

Claim:
An apparatus for reducing shock to a riser tensioner occurring during an extreme stroke position, the riser tensioner adapted to be connected between a riser that extends from subsea well equipment through an opening in a vessel, the apparatus comprising: a tubular conductor that is adapted to surround the riser where the riser passes though the opening in the vessel; and a stop and a shock absorber, one being adapted to be mounted to the vessel and the other to the conductor, the stop and the shock absorber being axially movable relative to each other and relative to the axis of the conductor, so that during an extreme stroke position of the riser tensioner, the stop and the shock absorber impact each other for absorbing shock, wherein the shock absorber comprises: upper and lower annular frame members that are movable toward and away from each other; and at least one resilient member between the frame members.