Patent ID: 8245786

Claim:
A riser tensioning system, comprising: a hydraulic cylinder: a piston rod disposed within the hydraulic cylinder and extendable therefrom for supporting a riser from a platform, the piston rod comprising: a body having an axis, a cylindrical shank, a threaded rod end joining a first end of the shank and located within the cylinder, and a threaded piston end joining a second end of the shank for coupling with a riser collar, the body being formed from a steel alloy; a tubular covering on the shank of the body, the covering having an end flush with the second end of the shank, the covering being formed from a corrosion-resistant alloy for protecting the shank from corrosion, and the covering defining an annulus between the covering and the shank connected to a port; and a bonding material located between the shank and the tubular covering for the tubular covering to the shank injected via the port.