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US 2007/0181310 A1Published application
System, method, and apparatus for sleeved tensioner rod with annular adhesive retention
AssigneeVetco Gray Inc.
InventorFife Ellis
Life of this patent
Estimating the term…
Abstract
A corrosion-resistant alloy tube is formed and bonded to a pre-machined steel alloy rod to form a riser tensioner cylinder rod. During assembly, an epoxy is injected into an annular space between the tube and rod and then cured. The bonded tube is ground to a desired surface finish prior to installation and utilizes a double seal arrangement that prevents external pressure or corrosive fluids from entering the cured epoxy in the annular space.
Claims18
A piston rod, comprising:
- a body having an axis, a shank, a threaded rod end, and a piston end, the body being formed from a steel alloy;
- a covering on the body positioned between the threaded rod end and the piston end, the covering being formed from a corrosion-resistant alloy for protecting the body from corrosion, and the covering defining an annulus between the covering and the body;
- and
- a bonding material located between the body and the covering for securing the covering to the body.
1 more element
A riser tensioning mechanism, comprising:
- a platform;
- a riser extending downward from the platform to a subsea wellhead;
- a plurality of hydraulic cylinders, each having a cylinder housing and a piston rod extending from each cylinder housing for supporting the riser relative to the platform;
- each piston rod comprising:
- a structural steel member;
- a covering bonded to the structural steel member with an adhesive, the covering being formed from a corrosion-resistant alloy for protecting the piston rod from corrosion.
3 more elements
A method of fabricating a piston rod, comprising:
- (a) providing a structural steel member;
- (b) placing a tube around the structural steel member to form a subassembly and define an annulus between the tube and the structural steel member;
- (c) securing and sealing end connectors to the subassembly;
- (d) injecting an adhesive into the annulus via the end connectors;
- then
- (e) curing the adhesive and then removing the end connectors to form an assembly.
3 more elements
Dependencies are inferred from the claim text.