Process for lining the interior surface of a metal pipe for conveying oil
AssigneeE. I. DuPont de Nemours and Company
InventorLaurence Waino McKeen
Life of this patent
Estimating the term…
Abstract
The present invention relates to a process for adhering a lining to the interior surface of an oil pipe wherein the lining imparts substantially reduced adhesion of asphaltenes, paraffin wax, and inorganic scale, so as to reduce plugging of the oil pipe, and impermeability to salt water so as to protect the oil pipe from corrosion.
Claims18
Process for adhering a lining consisting of a perfluoropolymer to the interior surface of a metal pipe and exposing said lining to oil wherein said lining provides an anti-stick surface that reduces the deposition in said pipe 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.
Process for forming an anti-stick lining on the interior surface of a metal pipe comprising:
- 1) applying a primer layer to the interior surface of said pipe, said primer layer comprising a fluoropolymer;
- 2) disposing an overcoat on top of said primer layer, wherein said overcoat comprises multiple layers including a lower layer and an upper layer and wherein said upper layer has an exterior anti-stick surface consisting essentially of perfluoropolymer;
- 3) baking said layers to form said lining;
- and
- 4) exposing said lining to oil wherein said anti-stick surface reduces the deposition in said pipe of asphaltenes, paraffin wax, or inorganic scale as compared to the interior surface of said pipe without said lining being present, so as to avoid pluggage of said pipe.
Process for protecting the interior surface of a metal pipe by applying a liquid composition to the interior surface of said pipe, wherein said composition comprises fluoropolymer and a plurality of particles forming a mechanical barrier against permeation of water, solvents and gases to the pipe;
- baking said composition to form a lining;
- and exposing said lining to oil wherein said lining imparts corrosion resistance to said pipe.
Dependencies are inferred from the claim text.