Coated pipes for harsh environments

• US 7,870,877 B2
• Filed: 05/26/2009
• Issued: 01/18/2011
• Est. Priority Date: 11/24/2004
• Status: Active Grant

• Current Assignee: The Chemours Company FC, LLC (The Chemours Company)
• Original Assignee: E. I. du Pont de Nemours and Company (Corteva, Inc.)
• Inventors: McKeen, Laurence Waino, Mohan, Pidatala K., Obal, W. Douglas, Farnsworth, Kimberly Dawn, Mestemacher, Steven A.
• Primary Examiner(s): Brinson; Patrick F
• Application Number:
  US12/471,648
• Publication Number:
  US 20090265913A1
• Time in Patent Office: 602 Days
• Field of Search: 138/145, 138/146, 138/137, 138/140, 138/141, 138/DIG.3, 138/DIG.7, 428/36.91
• US Class Current: 138/137
• CPC Class Codes: B05D 5/083 involving the use of fluoropolymers
• CPC Class Codes: B05D 7/222 of pipes
• CPC Class Codes: B05D 7/54 No clear coat specified
• CPC Class Codes: B32B 1/08 Tubular products
• CPC Class Codes: B32B 2255/10 on synthetic resin layer or on natural or synthetic rubber layer
• CPC Class Codes: B32B 2307/304 Insulating
• CPC Class Codes: B32B 2307/552 Fatigue strength
• CPC Class Codes: B32B 2307/554 Wear resistance
• CPC Class Codes: B32B 2307/714 Inert, i.e. inert to chemical degradation, corrosion
• CPC Class Codes: B32B 2307/7242 Non-permeable
• CPC Class Codes: B32B 2307/7265 Non-permeable
• CPC Class Codes: B32B 2307/746 Slipping, anti-blocking, low friction
• CPC Class Codes: B32B 2597/00 Tubular articles, e.g. hoses, pipes
• CPC Class Codes: B32B 27/06 as the main or only constituent of a layer, which is next to another layer of the same or of a different material next to a layer of a particular substance B32B9/045; next to a bituminous or tarry layer B32B11/046; next to a water setting substance layer B32B13/12; next to a metal layer B32B15/08; next to a glass layer B32B17/10; next to a layer formed of natural mineral fibres or particles B32B19/045; next to a wood layer B32B21/08; next to a cellulosic plastic layer B32B23/08; next to a natural or synthetic rubber layer B32B25/08
• CPC Class Codes: B32B 27/304 comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
• CPC Class Codes: B32B 27/322 comprising halogenated polyolefins, e.g. PTFE
• CPC Class Codes: B32B 7/12 using interposed adhesives or interposed materials with bonding properties
• CPC Class Codes: F16L 58/10 by rubber or plastics
• CPC Class Codes: F16L 58/1009 the coating being placed inside the pipe
• CPC Class Codes: F16L 58/1054 the coating being placed outside the pipe
• CPC Class Codes: Y10S 138/03 : Polytetrafluoroethylene, i.e. PTFE
• CPC Class Codes: Y10T 29/49982 : Coating

Abstract

The present invention relates to a pipe, especially an oil pipe, having a lining comprising a fluoropolymer adhered to its interior surface and a lining formed on its exterior surface. The interior and/or exterior lining may comprise a primer layer comprising a fluoropolymer, and preferably a perfluoropolymer and an overcoat or a preformed film adhered to the primer layer. Either the overcoat or the preformed liner also comprises a fluoropolymer, and preferably a perfluoropolymer. The surface of the lining facing the flowable media, such as oil, may be a pure perfluoropolymer to provide a particularly good non-stick surface for the oil.

Claims

1. Process for forming nonstick surface and insulating linings on a rigid pipe, comprising (a) forming an adherent fluoropolymer lining on the interior surface of the rigid pipe from liquid-based composition containing said fluoropolymer, and (b) forming an insulating lining on the exterior of the rigid pipe.

2. The process of claim 1, wherein the exterior lining is wrapped around the exterior of the rigid pipe.

3. The process of claim 1, wherein the exterior lining is slipped over the exterior of the rigid pipe.

4. The process of claim 1, wherein said rigid pipe is at least 20 feet long.