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LNG 9% Nickel

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  Automatic UltrasonicTesting (AUT) of weldsin 9% Nickel LNG tanks Frits DijkstraRöntgen Technische Dienst bvRotterdam, The Netherlands  Contents of presentation  Why UT in lieu of Radiography?  History  The challenge of 9% Nickel welds UT  Solutions  UT sensitivity for relevant defects  Is TOFD a solution?  Codes, acceptance criteria, validation  Manual or (semi) mechanised?  Conclusions  Why UT in lieu of RT? (1/3)  No radiation -no safety hazards-no conflict with construction activity-saves time  RT: density & diffraction problems  UT: sensitive for relevant defects  Speed (up to 100 metres / day)  Instant results, direct feedback  Lower repair rate, provided tailor-madeacceptance criteria are used  Why UT in lieu of RT? (2/3)  Direct feedback means:-no time delay because of filmprocessing-indications are discovered as theydevelop, prior to becoming rejects-early warning means: chance toadjust welding machine-defects are avoided in this way
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