PAUT based Techniques Developed for Power Industries and Refinery in Taiwan Yung-How Wu 1 , Chu-Chung Hsiao 2 MCL, Industrial Technology Research Institute Rm 827, Bldg. 52, No. 195, Sec. 4, Chung Hsing Rd., Chutung, Hsinchu, Taiwan 31040, R.O.C. 886-(0)933792939; [email protected]886- (0)922956668; [email protected], ABSTRACT Although conventional ultrasonic method is still widely used elsewhere, PAUT technique is applied increasingly for improving the ISI of utility, refinery and as well the emerging wind power in Taiwan. PAUT together with scanner is one of the major advantages to precede conventional UT by enhancing the defect characterization or inspection speed. In this study, special scanners were designed and employed with PAUT for the inspection of composite blades, bolts of wind turbine and anchor bolts of nuclear RPV skirt. Results showed that delamination of composite and fatigue crack of bolt may be detected and sized in more confidence and convenience for in-situ inspections. Moreover, PAUT was also used to characterize carefully the inner crack of pressure vessel for FFS assessment. Crack was found in safe margin and hence remained to operate. In conclusions, PAUT together with manipulator designed for specific purpose may facilitate the applications of PAUT technique widely in ISI of various industrial sectors. Keywords: Phased Array, Ultrasonic, Wind turbine, Blade, Bolt, Refinery, FFS INTRODUCTION Though phased array ultrasonic technique (PAUT) has been well known and commonly used in medical field, it is just used increasingly in industrial sectors as energy, transportation and materials. Most NDE technicians now a day are still using conventional single element ultrasonic method in manufacturing or in service inspection due to the higher cost and skill required by PAUT technique. However, the demand of fast transportation and low energy consumption vehicles and structures is driving the application and evolution of advanced digital NDT methods such as PAUT. Better inspection result may be achieved to meet the more stringent quantitative requirements for better O&M by FFS for example. It therefore generates a cycle for the continuing evolution and challenge of various NDT disciplines as shown in Figure 1. To meet more stringent application demands, materials of higher strength and thinner section are pursued by the mechanical engineers that smaller defects are then required to find and measure by NDT technicians with advanced systems or techniques. Inspectors with better training, experience and education is necessary and in turns, to assure faster transportation and as well lighter or safer structures. Figure 1: The correlation and challenge of NDT related disciplines
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Paut based techniques developed for power industries and refinery in taiwan yh wu1
Although conventional ultrasonic method is still widely used elsewhere, PAUT technique is applied increasingly for improving the ISI of utility, refinery and as well the emerging wind power in Taiwan. PAUT together with scanner is one of the major advantages to precede conventional UT by enhancing the defect characterization or inspection speed. In this study, special scanners were designed and employed with PAUT for the inspection of composite blades, bolts of wind turbine and anchor bolts of nuclear RPV skirt. Results showed that delamination of composite and fatigue crack of bolt may be detected and sized in more confidence and convenience for in-situ inspections. Moreover, PAUT was also used to characterize carefully the inner crack of pressure vessel for FFS assessment. Crack was found in safe margin and hence remained to operate. In conclusions, PAUT together with manipulator designed for specific purpose may facilitate the applications of PAUT technique widely in ISI of various industrial sectors.
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PAUT based Techniques Developed for Power Industries and Refinery in
Taiwan
Yung-How Wu
1, Chu-Chung Hsiao
2
MCL, Industrial Technology Research Institute Rm 827, Bldg. 52, No. 195, Sec. 4, Chung Hsing Rd., Chutung, Hsinchu, Taiwan 31040, R.O.C.