Lined vessels for conveying chemicals

a technology for conveying vessels and chemicals, applied in the field of vessels or pipes, can solve the problems of affecting the production and transportation of chemicals, and affecting the performance of lined pipes, so as to reduce the deposition performance of lined pipes

Inactive Publication Date: 2005-10-20
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0005] The present invention satisfies the need by providing a pipe for conveying chemicals, especially an oil conveying pipe (oil pipe) having a nonstick interior surface formed by a preformed fluoropolymer film adhered to its interior surface. The preformed film is capable of reducing-to-eliminating the deposition (buildup) of one or more of the asphaltene, paraffin wax, and inorganic scale on the interior surface of the oil pipe. Preferably, this reduction is at least 40%, preferably at least 50%, for at least one of these materials as compared to the unlined oil pipe, and more prefe

Problems solved by technology

Pipes used in the production and transportation of chemicals are subject to corrosion and plugging.
Corrosion is induced by the hot underground environment in which down-hole pipes convey oil from deeply buried deposits to the earth's surface.
Materials such as water, sulfur, sulfur dioxide, carbon dioxide, present in the oil typically make it acidic causing corrosion of the interior surface of the pipe.
Even at cooler temperatures, transportation pipelines that extend for long distances close to the earth's surface experience the effects of corrosion because of the long contact times involved.
Corroded pipes are difficult and expensive to replace.
The resultant inso

Method used

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Examples

Experimental program
Comparison scheme
Effect test

examples

[0047] Sample preparation for each type of testing is provided later in the Examples.

[0048] The primer layers formed in the Examples have the following pre-bake compositions:

TABLE 1Liquid PrimersPrimer12Ingredientwt %wt %FluoropolymerFEP12.5ETFE20.7Polymer binderPolyamideimide1.13.7Polyethersulfone7.6Polyphenylene Sulfide3.4SolventsNMP*47.81.9Other Organics**20.14.7Water60.2Pigments9.94.2Dispersing Agent1.01.2Total100100

*NMP is N-methyl-2-pyrrolidone

**Other organics may include solvents such as MIBK (methyl isobutyl ketone), hydrocarbons such as heavy naphtha, xylene etc., furfuryl alcohol, triethanol amine or mixtures thereof.

FEP: TFE / HFP fluoropolymer containing 11.1-12.4 wt % HFP, an average particle size of 8 micrometers and a melt flow rate of 6.5-7.5 g / 10 min measured at 372° C. by the method of ASTM D-1238.

ETFE: E / TFE / PFBE fluoropolymer containing 14-16 wt % ethylene and 4.0-5.4 wt % PFBE having average particle size of 8 micrometers and a melt flow rate of 3.9-7.1 g / 10...

example 1

[0054] Aluminum sheet is grit blasted lightly. Primer 1 is sprayed onto the sheet and dried for 10 min at 399° C. The primer layer is 5-10 microns thick. Polymer Film A is compression molded onto the primed sheet. The thickness of the Polymer Film A is about 1000 microns. The sample is cut into strips, baked at 350° C. for 5 minutes and tested using a 180° peel test according to ASTM D 1876. The adhesion strength is 14 lbf / in.

example 2

[0055] Aluminum sheet is grit blasted lightly. Primer 1 is sprayed onto the sheet and dried for 10 min at 177° C. Barrier layer A is then sprayed onto the primed sheet and dried for 10 min at 399° C. The primer layer is 5-10 microns thick. The barrier layer is 30-60 microns thick. Polymer Film A is compression molded onto the foil. The thickness of the Polymer Film A is about 1000 microns. The sample is cut into strips, baked at 350° C. for 5 minutes and tested using a 180° peel test according to ASTM D 1876. The adhesion strength is 15 lbf / in.

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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.

Description

FIELD OF THE INVENTION [0001] This invention relates to vessels or pipes that store or convey chemicals and more particularly to linings for the interior surface of such vessels. In particular, the vessel may be a storage tank or an oil conveying pipe. BACKGROUND OF THE INVENTION [0002] Pipes used in the production and transportation of chemicals are subject to corrosion and plugging. An example of such a pipe is oil pipe which is generally large and for reasons of economy is manufactured from carbon steel rather than more expensive corrosion resistant alloys. Corrosion is induced by the hot underground environment in which down-hole pipes convey oil from deeply buried deposits to the earth's surface. Materials such as water, sulfur, sulfur dioxide, carbon dioxide, present in the oil typically make it acidic causing corrosion of the interior surface of the pipe. Even at cooler temperatures, transportation pipelines that extend for long distances close to the earth's surface experien...

Claims

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Application Information

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IPC IPC(8): B32B1/08B32B15/08F16L9/14F16L57/06F16L58/10
CPCB32B1/08B32B15/08F16L58/1009B05D7/22B05D3/02B05D3/12F16L58/1036Y10T137/0318B32B7/12B32B2307/306B32B2307/714B32B27/20B32B2597/00B32B2327/12B32B2327/18B32B27/322
Inventor MCKEEN, LAURENCE WAINOFARNSWORTH, KIMBERLY DAWNOBAL, W. DOUGLASMOHAN, PIDATALA K.
Owner EI DU PONT DE NEMOURS & CO
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