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US 4,226,444 AGranted
Pipe joints
AssigneePilgrim Engineering Developments Limited
InventorThomas W. Bunyan
Life of this patent
Estimating the term…
Abstract
A method of joining pipes in which a sleeve is placed over the adjacent ends of the pipes so as to overlap each pipe. The sleeve fits with clearance around the pipe ends. The ends of the clearance space are closed by inflating hollow sealing rings and then epoxy resin is injected into the clearance space to fill the space. The pressure of the epoxy resin composition is then raised to a pressure substantially greater than atmospheric and the pressure is maintained until the resin composition is set.
Claims7
A joint comprising:
- a coupling sleeve;
- a pipe end, said coupling sleeve fitting closely but with clearance around the pipe end;
- means for closing the ends of said clearance space between said pipe end and said sleeve, said means comprising grooves in said sleeve at each end of said clearance space, hollow sealing rings located in said grooves, and a hardenable composition injected in said sealing rings inflating said sealing rings so as to span said space between said sleeve and said pipe end;
- a layer of hardenable composition set under pressure substantially greater than atmospheric filling said clearance space and in intimate contact with said pipe end and said coupling sleeve so that when the interior of the pipe is at atmospheric pressure the pipe end is pre-stressed radially inwardly, the layer of hardenable composition extending substantially over the whole of the interface between the pipe end and the coupling sleeve.
1 more element
Dependencies are inferred from the claim text.