Corrosion control
First Claim
1. A method of inhibiting corrosion in a slurry transporting pipeline, the method comprising the steps of:
- contacting for a period of at least 15 minutes an inner surface of the pipeline with a composition of matter, the composition being at least one corrosion inhibitor within a water solvent in the absence of any slurry,optionally purging the pipeline of the water, andtransporting a slurry through the pipelinewherein the corrosion inhibitor comprises at least one zinc compound selected from the list consisting of;
zinc phosphates, zinc sulfates, and zinc halogenates, and any combination thereof.
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Accused Products
Abstract
This invention is directed to a method of inhibiting corrosion-erosion in pipelines carry slurries. The method includes contacting for a period of at least 1 hour an inner surface of the pipeline with a composition of matter, the composition being at least one corrosion inhibitor within a water solvent, purging the pipeline of the water, and then transporting a slurry through the pipeline. This method is surprisingly effective because it prevents erosion with materials that were previously known to not have any effect on erosion. In addition it is effective on especially hard slurries such as bauxite for which previous uses of these inhibitors did not prevent erosion.
26 Citations
14 Claims
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1. A method of inhibiting corrosion in a slurry transporting pipeline, the method comprising the steps of:
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contacting for a period of at least 15 minutes an inner surface of the pipeline with a composition of matter, the composition being at least one corrosion inhibitor within a water solvent in the absence of any slurry, optionally purging the pipeline of the water, and transporting a slurry through the pipeline wherein the corrosion inhibitor comprises at least one zinc compound selected from the list consisting of;
zinc phosphates, zinc sulfates, and zinc halogenates, and any combination thereof.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of inhibiting corrosion in a slurry transporting pipeline, the method comprising the steps of:
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contacting for a period of at least 15 minutes an inner surface of the pipeline with a composition of matter, the composition being at least one corrosion inhibitor within a water solvent in the absence of any slurry, optionally purging the pipeline of the water, and transporting a slurry through the pipeline; wherein the corrosion inhibitor comprises at least one phosphate compound selected from the list consisting of;
sodium phosphate, potassium phosphate, ammonium phosphate, and any combination thereof.
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13. A method of inhibiting corrosion in a slurry transporting pipeline, the method comprising the steps of:
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contacting for a period of at least 15 minutes an inner surface of the pipeline with a composition of matter, the composition being at least one corrosion inhibitor within a water solvent in the absence of any slurry, optionally purging the pipeline of the water, and transporting a slurry through the pipeline; wherein the slurry comprises a solid material harder than coal. - View Dependent Claims (14)
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Specification