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US 5,649,568 AGranted
Glass fiber reinforced cement liners for pipelines and casings
AssigneeUnion Oil Company of California
InventorsWilliam C. Allen, David E. Stikkers, Daniel P. Hoyer
Life of this patent
Estimating the term…
Abstract
Conduits having cement-containing liners for the inner and outer surfaces of metal pipes include a fibrous material, such as glass fibers, to prevent cracking and/or inhibit crack propagation.
Claims27
A conduit for containing corrosive liquids comprising:
- an outer metal shell;
- and
- a cement-containing spun lining attached to the interior surface of the shell, said lining comprising hydrated cement, at least some fibers, essentially no sand, and at least 50 dry weight percent of cement.
A conduit for containing geothermal fluids comprising:
- an outer metal pipe;
- and
- a cement-containing spun lining attached to the interior surface of the pipe, said spun lining comprising at least 30 weight percent of a hydrated cement and between about 0.5 and 10 weight percent fibers, calculated on a dry weight basis, and essentially no sand, and wherein said lining has an average thickness of no more than about 1 inch.
Dependencies are inferred from the claim text.