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Currently, our Automatic Ultrasonic Test (AUT) system
is based on the simultaneous inspection of the "Phased
Array Linear Scanning and Dual TOFD". The system has
been applied to pre-service inspections at our shop as
an alternative to the radiographic test and for in-service
inspections at plant sites to inspect the circumferential
and longitudinal weld joints of coke drum shells. We have
newly adopted a "Dual Phase Array Sector Scanning
Method" for improving the capability to detect and measure
cracks caused by low cycle fatigue within overlay
welds and their heat affected zones. This paper reports
the improved inspection performance demonstrated by
the model tests. The new simultaneous inspection system
of the "Dual Phased Array Sector Scanning and Dual
TOFD", which simultaneously implements four different
kinds of Automatic Ultrasonic Tests, will be applied to
the in-service inspections of coke drums and major reactors
of petroleum refining and petrochemical plants. |
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