Patent ID: 7096940

Claim:
A centralizer system positioned in a marine riser system for a wellbore and a floating platform, at least one of said wellbore or said floating platform comprising a receptacle for receiving said centralizer system, said receptacle comprising a receptacle inner diameter, said centralizer system being operable for withstanding stresses produced by relative movement between said wellbore and said floating platform as well as water movement, said centralizer system comprising: a metallic pipe comprising a pipe outer diameter less than said receptacle inner diameter so as to be insertable into said receptacle and relatively moveable within said receptacle; an insulative coating in surrounding relationship to said metallic pipe, said insulative coating being operable for reducing at least one of corrosion or a galvanic reaction in the region of said receptacle and said metallic pipe when said metallic pipe is inserted therein; one or more metallic centralizers mounted on said metallic pipe, said insulative coating being annularly positioned between said one or more metallic centralizers and said metallic pipe, said one or more metallic centralizers having a centralizer outer diameter less than said receptacle inner diameter but greater than said pipe outer diameter; a clamp comprising at least two sections, said at least two sections comprising internal surfaces for engaging said insulative coating around said metallic pipe; one or more fasteners for said clamp operable to tighten said internal surfaces of said at least two sections with respect to each other against said insulative coating such that said at least two sections of said clamp are axially fixed in position with respect to said metallic pipe; and one or more interlocking members for interlocking said at least two sections of said clamp with respect to said one or more metallic centralizers to thereby prevent axial movement of said one or more metallic centralizers with respect to said metallic pipe.