which was considered to be related to the emission informa-
tion of Fig. 7(b), was a round individual porosity of about
0.5 cm diameter detected at the L2 position above the sensor
S4. Also, they were, respectively, estimated to be unaccep-
table ¯aws by the weld-related industrial codes and stan-
dards [10±12]. But, as shown in Fig. 7(a) and (b) , the AE
activity related to them was not characteristic of defect
growth. Namely, at the applied load below 110% maximum
operating load, they were active but not intense emission
sources. This result serves to emphasize that the information
given by the dynamic AE may be different from the static
measurement of conventional NDE techniques, unless any
structural defect grows during the applied test load. It is
expected that the AE testing under a new adequate load in
excess of 110% load level of the repaired storage tank will
offer more reliable information of structural defects than the
present test.
which was considered to be related to the emission informa-
tion of Fig. 7(b), was a round individual porosity of about
0.5 cm diameter detected at the L2 position above the sensor
S4. Also, they were, respectively, estimated to be unaccep-
table ¯aws by the weld-related industrial codes and stan-
dards [10±12]. But, as shown in Fig. 7(a) and (b) , the AE
activity related to them was not characteristic of defect
growth. Namely, at the applied load below 110% maximum
operating load, they were active but not intense emission
sources. This result serves to emphasize that the information
given by the dynamic AE may be different from the static
measurement of conventional NDE techniques, unless any
structural defect grows during the applied test load. It is
expected that the AE testing under a new adequate load in
excess of 110% load level of the repaired storage tank will
offer more reliable information of structural defects than the
present test.
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