Lined vessels for conveying chemicals

Abstract

The present invention relates to a vessel, in particular a pipe, especially an oil pipe, having a preformed film adhered onto the interior surface of the pipe, the interior surface of the preformed film reducing the deposition of at least one of asphaltenes, paraffin wax, and inorganic scale by at least 40% as compared to the interior surface of said oil pipe without said preformed film being present. In a preferred embodiment, the preformed film is adhered to the interior surface of the pipe with a primer layer with an optional barrier layer between the primer layer and the preformed film.

1 . An oil pipe having a primer layer adhered to its interior surface and a preformed fluoropolymer film adhered to said primer layer.  
   
   
       2 . A pipe having a primer layer comprising a fluoropolymer and heat resistant polymer binder adhered to its interior surface and a preformed fluoropolymer film adhered to said primer layer.  
   
   
       3 . The oil pipe of  claim 1  wherein said primer layer comprises a fluoropolymer.  
   
   
       4 . An oil pipe having a preformed film adhered onto the interior surface of the pipe, the interior surface of said preformed film reducing the deposition of at least one of asphaltenes, paraffin wax, and inorganic scale by at least 40% as compared to the interior surface of said oil pipe without said preformed film being present.  
   
   
       5 . The oil pipe of  claim 1 ,  2  or  4 , wherein the preformed film provides corrosion protection to the interior surface of the pipe.  
   
   
       6 . The oil pipe of claims  2  or  3 , wherein said fluoropolymer in said primer layer and said preformed film is independently selected from the group of polymers and copolymers of trifluoroethylene, hexafluoropropylene, monochlorotrifluoroethylene, dichlorodifluoroethylene, tetrafluoroethylene, perfluorobutyl ethylene, perfluoro(alkyl vinyl ether), vinylidene fluoride, and vinyl fluoride and blends thereof and blends of said polymers with a nonfluoropolymer.  
   
   
       7 . The oil pipe of claims  1  or  2 , wherein said preformed fluoropolymer film is selected from polyvinyl fluoride, fluorinated ethylene/propylene copolymer, ethylene/tetrafluoroethylene copolymer, tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer, polyvinylidene fluoride and a blend of polyvinylidene fluoride and an acrylic polymer.  
   
   
       8 . The oil pipe of  claim 3  wherein said fluoropolymer of the primer layer is selected from fluorinated ethylene/propylene copolymer, ethylene/tetrafluoroethylene copolymer, and tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer.  
   
   
       9 . The oil pipe of  claim 3  wherein said primer layer contains at least one heat resistant polymer binder.  
   
   
       10 . The oil pipe of claims  1  or  2  having a fluoropolymer barrier layer positioned between said primer layer and said preformed film.  
   
   
       11 . The oil pipe of  claim 10  wherein said fluoropolymer barrier layer comprises a fluoropolymer containing a platelet shaped filler particle.  
   
   
       12 . The oil pipe of claims  2  or  3  wherein said preformed film contains a platelet shaped filler particle.  
   
   
       13 . The oil pipe of  claim 12  wherein said platelet shaped filler particle is selected from mica, glass flake and stainless steel flake and mixtures thereof.  
   
   
       14 . The oil pipe of  claim 11  wherein said fluoropolymer of the barrier layer is selected from fluorinated ethylene/propylene copolymer, ethylene/tetrafluoroethylene copolymer, and tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer.  
   
   
       15 . The oil pipe of claims  1 ,  2  or  4  wherein said pipe has an inner diameter of at least 5 cm and a length of at least 3 m. (2 in and 10 ft).  
   
   
       16 . The oil pipe of claims  1  or  2  wherein said primer layer is about 10-30 micrometers thick and said preformed film is about 500 to about 2500 micrometers thick. (20-100 mils).  
   
   
       17 . Process for forming a nonstick surface on the interior surface of a pipe, comprising (a) applying primer coating to said surface (b) heating said coating to form a primer layer on said surface (c) applying a preformed fluoropolymer film on said primer layer, and (d) fusion bonding said preformed fluoropolymer film to said primer layer.  
   
   
       18 . The process of  claim 17  wherein said primer comprises a fluoropolymer.  
   
   
       19 . The process of  claim 17  wherein said pipe is an oil conveying pipe.  
   
   
       20 . The process of  claim 17  wherein a barrier layer is applied to said primer layer prior to applying said preformed film and then fusion bonding said preformed film to said barrier layer by baking said pipe.  
   
   
       21 . The process of  claim 17  wherein said pipe is baked at temperatures from about 180° C. to about 400° C. to achieve fusion bonding.  
   
   
       22 . The process of  claim 17  wherein said preformed film is in the shape of a tubular liner.  
   
   
       23 . The process of  22  wherein said tubular liner of said preformed film is applied to the interior surface of said pipe by gripping one end of said liner, pulling said liner into said pipe, mechanically reducing said liner, releasing said liner and allowing said liner to expand into tight engagement with said primer coating on said interior surface of said pipe.  
   
   
       24 . The process of  claim 23  wherein said mechanically reducing is by pulling said liner through a reduction die.  
   
   
       25 . The process of  claim 22  wherein the initial outer diameter of said tubular liner is about 10 to 15% greater than the inner diameter of said pipe.  
   
   
       26 . A process of reducing the deposition of at least one of asphaltenes, paraffin wax, and inorganic scale by adhering a preformed fluoropolymer film to the interior surface of the pipe, wherein at least one of the asphaltenes, paraffin wax, and inorganic scale are reduced by at least 40% by as compared to the interior surface of said oil pipe without said preformed film being present.  
   
   
       27 . A process for transporting oil in a pipe having a preformed film adhered onto the interior surface of the pipe, the interior surface of said preformed film reducing the deposition of at least one of asphaltenes, paraffin wax, and inorganic scale by at least 40% as compared to the interior surface of said oil pipe without said preformed film being present.  
   
   
       28 . The process of claims  26  or  27  wherein the preformed film provides corrosion protection to the interior surface of the pipe.