Electromagnetic Testing of Moisture Separation Reheater Tube based on Multivariate Singular Spectral Analysis

Moisture separator reheater (MSR) tubing systems are an important part of a pressurized-water power plant to increase the efficiency of the heat transfer rate. The MSR tubes are finned tubes which are made of ferritic stainless steel (SS439) with a high strength and corrosion resistance characterist...

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Bibliographic Details
Published in:Applied sciences 2020-06, Vol.10 (11), p.3954
Main Authors: Luong, Van Su, Le, Minhhuy, Nguyen, Khoa Dang, Le, Dang-Khanh, Lee, Jinyi
Format: Article
Language:English
Subjects:
Chemical properties
Corrosion
Corrosion and anti-corrosives
Corrosion resistance
Corrosion tests
Eddy current testing
Eddy currents
Efficiency
Electromagnetic testing
Equipment and supplies
Ferritic stainless steel
Fins
Gabor transformation
Hall sensor array
Heat transfer
Inspection
Magnetic fields
Magnetic flux
Magnetic flux leakage testing
Measurement
Mechanical properties
Methods
moisture separator reheater tube
Moisture separator reheaters
Multivariate analysis
Noise
Nondestructive testing
Nuclear power plants
partial eddy current testing
Permeability
Power plants
Sensors
Signal processing
Spectral analysis
Stainless steel
Steel tubes
Turbogenerators
Wavelet transforms
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Summary:Moisture separator reheater (MSR) tubing systems are an important part of a pressurized-water power plant to increase the efficiency of the heat transfer rate. The MSR tubes are finned tubes which are made of ferritic stainless steel (SS439) with a high strength and corrosion resistance characteristics. However, corrosion can appear along with the fins after a long period of operation of the MSR tubes that requires nondestructive testing (NDT) of the MSR tubes’ periodically. Electromagnetic testing (ET) is an efficient NDT method for the inspection of far-side corrosion in the MSR tubes. However, the ET sensor signal is affected by signal noise from the fins. Material degradation that make it challenging to inspect and evaluate the corrosion. In this study, we proposed three ET methods, including magnetic flux leakage testing, eddy current testing and partial saturation eddy current testing, and incorporated with a multivariate singular spectral analysis (MSSA) filter to improve the detectability of the corrosion in the MSR tubes. The proposed MSSA filter was compared with the multivariate wavelet transform filter and Gabor transform filter, and the results showed more efficient and stable results of the MSSA filter in the extraction of the corrosion signal.
ISSN:2076-3417
2076-3417
DOI:10.3390/app10113954