Metal Surface Cleanliness Verification via Electrical Resistance Measurement
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Solution Overview
Problem
Current methods for cleaning metal surfaces in industrial plants, such as chemical and petrochemical plants, are inefficient and lack a reliable means to ensure complete cleaning, often resulting in incomplete cleaning, process downtime, and increased maintenance costs due to the inability to visually inspect all areas effectively.
Innovation Solution
A method involving high-pressure water jets for cleaning, followed by measuring the electrical resistance of the metal surfaces using a resistance meter with a probing tip and counter tip, where the electrical resistance value is compared to a predetermined threshold to ensure sufficient cleaning, allowing for precise assessment of cleaning completeness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If visual inspection methods are used to assess cleaning results, then the inspection process is simple and quick, but the measurement precision and reliability are insufficient for complex plant designs
Solution Approach 1:
The patent replaces visual inspection methods with electrical resistance measurement. A resistance meter with probing tips measures the electrical resistance of the metal surface, which changes based on the presence of contaminant layers. This substitution provides objective, quantitative data for cleaning assessment, eliminating the subjectivity and limitations of visual inspection while maintaining operational simplicity.
2Measurement precision
If elaborate analytical methods are used to determine cleaning degree, then the measurement precision improves, but the device complexity and time consumption increase
Solution Approach 1:
The patent substitutes complex analytical methods with a simple electrical resistance measurement system. The resistance meter uses basic electrical principles to detect contaminant layers through changes in surface resistance, providing accurate cleaning assessment without requiring elaborate equipment or complex procedures.
Solution Approach 2:
The patent utilizes the change in electrical resistance parameter as an indicator of cleaning status. By measuring resistance at different stages of cleaning and comparing to reference values, the system provides precise cleaning assessment through a single, easily measurable physical parameter.
3Power
If high-pressure water jets are used for cleaning, then the cleaning power increases, but the reliability of achieving sufficient cleanliness cannot be guaranteed
Solution Approach 1:
The patent implements a feedback mechanism where electrical resistance measurements are taken during and after cleaning operations. The measured resistance values provide real-time feedback on cleaning effectiveness, allowing operators to adjust cleaning parameters or repeat cleaning until the desired resistance threshold is achieved, thereby guaranteeing cleaning reliability.
Solution Approach 2:
The patent replaces subjective visual assessment of cleaning effectiveness with objective electrical resistance measurement. This substitution provides a reliable, quantifiable criterion for determining when cleaning is sufficient, eliminating the uncertainty associated with visual inspection alone.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method ensures reliable and efficient cleaning of metal surfaces, reducing maintenance costs and extending the operational time of industrial plant components by providing a quick and precise means to verify the cleanliness of metal surfaces, even in inaccessible areas.
Implementation Method 1
measuring the electrical resistance R A1 of the surface of the metal component at at least one point of the cleaned area by at least one resistance meter
Implementation Method 2
the counter tip is a punctual tip held by a magnet to a surface of the metal component of the industrial plant
Data Source
Figure 1
Figure 2
AI summary
A method for cleaning a metal surface of a metal component of an industrial plant is disclosed comprising measuring the electrical resistance RA1 of a metal component over a cleaned area of the metal surface with a resistance meter, comparing the electrical resistance RA1 measured with a pre-determined electrical resistance value RDET, assessing whether RA1 is greater, smaller or equal to RDET, and repeating cleaning if the electrical resistance RA1 measured is greater than RDET, or terminating cleaning of the surface area of the metal component if RA1 is smaller than or identical to RDET.