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Thermocouple Degradation data in Corrosive environments
- Citation Author(s):
-
Dinesh KumarValipi
AnindyaBhattacharyya - Submitted by:
- Dinesh Kumar Valipi
- Last updated:
- Mon, 07/08/2024 - 15:58
- DOI:
- 10.21227/wbpx-7736
- Data Format:
- License:
41 Views- Categories:
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Abstract
Thermocouples are widely used in industrial applications due to their robustness, low cost, reliability and ability to survive in harsh environments. However, these thermocouples are prone to failure in a highly acidic medium such as nuclear fuel reprocessing plants. This paper investigates the degradation phenomenon and its effect on measurement accuracy when a thermocouple with mechanical damage to the protective sheath is placed in a corrosive media. This work takes a novel approach of micro-machining a small hole in the thermocouple to mimic sheath damage, which enables the corrosive medium to directly interact with the sensing material, i.e., Chromel and Alumel. The thermocouples with artificially induced sheath defects are then subjected to ageing in different concentrations of acidic media at a constant temperature, while degradation data i.e. temperature is read and logged. The time-to-failure data of thermocouples at each concentration is analyzed using the Weibull distribution. Inverse Power Law is then used to model the life-stress relationship under a ruptured sheath condition. The study also explores the correlation between the residual life and the position of simulated ruptures. ANOVA is employed to test the hypotheses regarding the influence of rupture position on thermocouple performance. The analysis results show that the location of damage is statistically significant in determining the thermocouple’s residual life under damaged sheath condition.
Excel file:01
In Thermocouple failure data in corrosive environments (nitric acid) at room temperature.xlsx file provides the data of degradation of TC in corrosive environment. It contains the five spreadsheets.
· The first spreadsheet provides information about the degradation of TC in 3N of diluted nitric acid.
· The second spreadsheet provides information about the degradation of TC in 4.5N of diluted nitric acid.
· The third spreadsheet provides information about the degradation of TC in 6N of diluted nitric acid.
· The fourth spreadsheet provides information about the degradation of TC in 7.5N of diluted nitric acid.
· The fifth spreadsheet provides information about the degradation of TC in 9N of diluted nitric acid.
Each spreadsheet contains eight columns of data. The first column represents the Time (hours), second to seventh columns represent the faulty TC data in corresponding normality, and the eighth column represents the average reference TC data in acid.
· After the failure of TC, i.e., the response of TC reaches zero, the time is considered as time to failure.
Excel file:02
In Thermocouple failure data in corrosive environments (nitric acid) at 65 C temp.xlsx file provides the data of degradation of TC in corrosive environment. It contains the five spreadsheets.
· The second spreadsheet provides information about the degradation of TC in 4.5N of diluted nitric acid.
· The third spreadsheet provides information about the degradation of TC in 6N of diluted nitric acid.
· The fourth spreadsheet provides information about the degradation of TC in 7.5N of diluted nitric acid.
· The fifth spreadsheet provides information about the degradation of TC in 9N of diluted nitric acid.
Each spreadsheet contains eight columns of data. The first column represents the Time (hours), second to fithth columns represent the faulty TC data in corresponding normality, and the sixth column represents the average reference TC data in acid and the seventh column represents room temperature.
· After the failure of TC, i.e., the response of TC reaches zero, the time is considered as time to failure.
Dataset Files
- Degradaton of Thermocouple in Corrosive environments Thermocouple failure data in corrosive environments (nitric acid) at 65 C temp.xlsx (273.93 kB)
- Degradaton of Thermocouple in Corrosive environments Thermocouple failure data in corrosive environments (nitric acid) at room temperature.xlsx (922.78 kB)
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