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US 2023/0417652 A1Published application
Method for Detecting Corrosion Severity of a Metallic Surface on a Pipeline
AssigneeThe Texas A&M University System
InventorsHomero Castaneda-Lopez, Lin Chen
Life of this patent
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Abstract
Provided herein are non-invasive and non-destructive methods for classifying the type of external corrosion defect and the severity thereof in the cathodic protection system on a buried pipeline. Mathematical tools and algorithms are utilized to classify the type and the severity of the corrosion defect.
Claims20
A method for detecting coating failures on a pipeline, comprising:
- selecting an area of interest on the underground pipeline;
- disconnecting a continuous cathodic protection of the underground pipeline;
- plotting a change in the cathodic protection at the area of interest over a period of time to produce a profile thereof;
- and
- correlating the profile with a coating failure or lack thereof at the area of interest.
2 more elements
A method for classifying a severity of a corrosion defect on a metallic pipeline, comprising:
- selecting a test point on the metallic pipeline;
- switching off voltage to a cathodic protection system on the metallic pipeline;
- acquiring an instantaneous potential relaxation at a plurality of acquisition times at the test point;
- modeling the acquired instantaneous potential relaxation at the plurality of acquisition times to produce a potential relaxation curve;
- and
- comparing the potential relaxation curve to a database of potential relaxation curves of a severity level of the corrosion defect, thereby classifying the severity of the corrosion defect.
3 more elements
A non-invasive inspection method for a buried metallic pipeline with a cathodic protection system, comprising:
- selecting a plurality of inspection places along the metallic pipeline;
- turning off the cathodic protection system to the metallic pipeline;
- modeling for each of the plurality of inspection places a plurality of instantaneous relaxation voltages each acquired at a predetermined time point as a potential relaxation curve;
- comparing each of the potential relaxation curves to a database of potential relaxation curves that are correlated with a level of corrosion;
- and
- identifying each of the plurality of inspection places on the buried pipeline as comprising a level of corrosion or without corrosion.
3 more elements
Dependencies are inferred from the claim text.