Coated pipes for conveying oil
AssigneeE. I. Du Pont de Nemours and Company
InventorLaurence Waino McKeen
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Abstract
The present invention relates to an oil pipe having a lining imparting substantially reduced adhesion of asphaltenes, paraffin wax, and inorganic scale, so as to reduce plugging of said oil pipe, and impermeability to salt water so as to protect the oil pipe from corrosion.
Claims4
A pipe used in the production or transportation of oil comprising a metal pipe and a lining exposed to oil, said lining comprising a primer layer adhered to the interior surface of the pipe, and an overcoat disposed on top of said primer layer, wherein said overcoat comprises multiple layers including a lower layer and an upper layer, where said upper layer has an exterior anti-stick surface exposed to the oil and consists essentially of baked perfluoropolymer, said lining thereby reducing the deposition of paraffin wax, as compared to the interior surface of said pipe without said lining being present, so as to avoid pluggage of said pipe, wherein said overcoat is applied as a liquid based composition.
Dependencies are inferred from the claim text.